diff --git a/examples/js/lib/d3.v4.js b/examples/js/lib/d3.v4.js
index 2c4aa86..5c59e8c 100644
--- a/examples/js/lib/d3.v4.js
+++ b/examples/js/lib/d3.v4.js
@@ -1,11 +1,11 @@
-// https://d3js.org Version 4.9.1. Copyright 2017 Mike Bostock.
+// https://d3js.org Version 4.11.0. Copyright 2017 Mike Bostock.
 (function (global, factory) {
 	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
 	typeof define === 'function' && define.amd ? define(['exports'], factory) :
 	(factory((global.d3 = global.d3 || {})));
 }(this, (function (exports) { 'use strict';
 
-var version = "4.9.1";
+var version = "4.11.0";
 
 var ascending = function(a, b) {
   return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
@@ -195,14 +195,15 @@ var e5 = Math.sqrt(10);
 var e2 = Math.sqrt(2);
 
 var ticks = function(start, stop, count) {
-  var reverse = stop < start,
+  var reverse,
       i = -1,
       n,
       ticks,
       step;
 
-  if (reverse) n = start, start = stop, stop = n;
-
+  stop = +stop, start = +start, count = +count;
+  if (start === stop && count > 0) return [start];
+  if (reverse = stop < start) n = start, start = stop, stop = n;
   if ((step = tickIncrement(start, stop, count)) === 0 || !isFinite(step)) return [];
 
   if (step > 0) {
@@ -574,11 +575,17 @@ function translateY(y) {
   return "translate(0," + (y + 0.5) + ")";
 }
 
+function number$1(scale) {
+  return function(d) {
+    return +scale(d);
+  };
+}
+
 function center(scale) {
   var offset = Math.max(0, scale.bandwidth() - 1) / 2; // Adjust for 0.5px offset.
   if (scale.round()) offset = Math.round(offset);
   return function(d) {
-    return scale(d) + offset;
+    return +scale(d) + offset;
   };
 }
 
@@ -602,9 +609,9 @@ function axis(orient, scale) {
         format = tickFormat == null ? (scale.tickFormat ? scale.tickFormat.apply(scale, tickArguments) : identity$1) : tickFormat,
         spacing = Math.max(tickSizeInner, 0) + tickPadding,
         range = scale.range(),
-        range0 = range[0] + 0.5,
-        range1 = range[range.length - 1] + 0.5,
-        position = (scale.bandwidth ? center : identity$1)(scale.copy()),
+        range0 = +range[0] + 0.5,
+        range1 = +range[range.length - 1] + 0.5,
+        position = (scale.bandwidth ? center : number$1)(scale.copy()),
         selection = context.selection ? context.selection() : context,
         path = selection.selectAll(".domain").data([null]),
         tick = selection.selectAll(".tick").data(values, scale).order(),
@@ -1244,9 +1251,9 @@ var selection_exit = function() {
   return new Selection(this._exit || this._groups.map(sparse), this._parents);
 };
 
-var selection_merge = function(selection) {
+var selection_merge = function(selection$$1) {
 
-  for (var groups0 = this._groups, groups1 = selection._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {
+  for (var groups0 = this._groups, groups1 = selection$$1._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {
     for (var group0 = groups0[j], group1 = groups1[j], n = group0.length, merge = merges[j] = new Array(n), node, i = 0; i < n; ++i) {
       if (node = group0[i] || group1[i]) {
         merge[i] = node;
@@ -1769,9 +1776,9 @@ var noevent = function() {
 
 var dragDisable = function(view) {
   var root = view.document.documentElement,
-      selection$$1 = select(view).on("dragstart.drag", noevent, true);
+      selection = select(view).on("dragstart.drag", noevent, true);
   if ("onselectstart" in root) {
-    selection$$1.on("selectstart.drag", noevent, true);
+    selection.on("selectstart.drag", noevent, true);
   } else {
     root.__noselect = root.style.MozUserSelect;
     root.style.MozUserSelect = "none";
@@ -1780,13 +1787,13 @@ var dragDisable = function(view) {
 
 function yesdrag(view, noclick) {
   var root = view.document.documentElement,
-      selection$$1 = select(view).on("dragstart.drag", null);
+      selection = select(view).on("dragstart.drag", null);
   if (noclick) {
-    selection$$1.on("click.drag", noevent, true);
-    setTimeout(function() { selection$$1.on("click.drag", null); }, 0);
+    selection.on("click.drag", noevent, true);
+    setTimeout(function() { selection.on("click.drag", null); }, 0);
   }
   if ("onselectstart" in root) {
-    selection$$1.on("selectstart.drag", null);
+    selection.on("selectstart.drag", null);
   } else {
     root.style.MozUserSelect = root.__noselect;
     delete root.__noselect;
@@ -1830,10 +1837,15 @@ function defaultSubject(d) {
   return d == null ? {x: exports.event.x, y: exports.event.y} : d;
 }
 
+function defaultTouchable() {
+  return "ontouchstart" in this;
+}
+
 var drag = function() {
   var filter = defaultFilter$1,
       container = defaultContainer,
       subject = defaultSubject,
+      touchable = defaultTouchable,
       gestures = {},
       listeners = dispatch("start", "drag", "end"),
       active = 0,
@@ -1843,12 +1855,14 @@ var drag = function() {
       touchending,
       clickDistance2 = 0;
 
-  function drag(selection$$1) {
-    selection$$1
+  function drag(selection) {
+    selection
         .on("mousedown.drag", mousedowned)
+      .filter(touchable)
         .on("touchstart.drag", touchstarted)
         .on("touchmove.drag", touchmoved)
         .on("touchend.drag touchcancel.drag", touchended)
+        .style("touch-action", "none")
         .style("-webkit-tap-highlight-color", "rgba(0,0,0,0)");
   }
 
@@ -1883,12 +1897,12 @@ var drag = function() {
 
   function touchstarted() {
     if (!filter.apply(this, arguments)) return;
-    var touches$$1 = exports.event.changedTouches,
+    var touches = exports.event.changedTouches,
         c = container.apply(this, arguments),
-        n = touches$$1.length, i, gesture;
+        n = touches.length, i, gesture;
 
     for (i = 0; i < n; ++i) {
-      if (gesture = beforestart(touches$$1[i].identifier, c, touch, this, arguments)) {
+      if (gesture = beforestart(touches[i].identifier, c, touch, this, arguments)) {
         nopropagation();
         gesture("start");
       }
@@ -1896,11 +1910,11 @@ var drag = function() {
   }
 
   function touchmoved() {
-    var touches$$1 = exports.event.changedTouches,
-        n = touches$$1.length, i, gesture;
+    var touches = exports.event.changedTouches,
+        n = touches.length, i, gesture;
 
     for (i = 0; i < n; ++i) {
-      if (gesture = gestures[touches$$1[i].identifier]) {
+      if (gesture = gestures[touches[i].identifier]) {
         noevent();
         gesture("drag");
       }
@@ -1908,13 +1922,13 @@ var drag = function() {
   }
 
   function touchended() {
-    var touches$$1 = exports.event.changedTouches,
-        n = touches$$1.length, i, gesture;
+    var touches = exports.event.changedTouches,
+        n = touches.length, i, gesture;
 
     if (touchending) clearTimeout(touchending);
     touchending = setTimeout(function() { touchending = null; }, 500); // Ghost clicks are delayed!
     for (i = 0; i < n; ++i) {
-      if (gesture = gestures[touches$$1[i].identifier]) {
+      if (gesture = gestures[touches[i].identifier]) {
         nopropagation();
         gesture("end");
       }
@@ -1955,6 +1969,10 @@ var drag = function() {
     return arguments.length ? (subject = typeof _ === "function" ? _ : constant$2(_), drag) : subject;
   };
 
+  drag.touchable = function(_) {
+    return arguments.length ? (touchable = typeof _ === "function" ? _ : constant$2(!!_), drag) : touchable;
+  };
+
   drag.on = function() {
     var value = listeners.on.apply(listeners, arguments);
     return value === listeners ? drag : value;
@@ -2539,7 +2557,7 @@ function nogamma(a, b) {
   return d ? linear(a, d) : constant$3(isNaN(a) ? b : a);
 }
 
-var interpolateRgb = ((function rgbGamma(y) {
+var interpolateRgb = (function rgbGamma(y) {
   var color$$1 = gamma(y);
 
   function rgb$$1(start, end) {
@@ -2559,7 +2577,7 @@ var interpolateRgb = ((function rgbGamma(y) {
   rgb$$1.gamma = rgbGamma;
 
   return rgb$$1;
-}))(1);
+})(1);
 
 function rgbSpline(spline) {
   return function(colors) {
@@ -2994,7 +3012,7 @@ var clockLast = 0;
 var clockNow = 0;
 var clockSkew = 0;
 var clock = typeof performance === "object" && performance.now ? performance : Date;
-var setFrame = typeof requestAnimationFrame === "function" ? requestAnimationFrame : function(f) { setTimeout(f, 17); };
+var setFrame = typeof window === "object" && window.requestAnimationFrame ? window.requestAnimationFrame.bind(window) : function(f) { setTimeout(f, 17); };
 
 function now() {
   return clockNow || (setFrame(clearNow), clockNow = clock.now() + clockSkew);
@@ -3085,12 +3103,12 @@ function nap() {
 function sleep(time) {
   if (frame) return; // Soonest alarm already set, or will be.
   if (timeout) timeout = clearTimeout(timeout);
-  var delay = time - clockNow;
+  var delay = time - clockNow; // Strictly less than if we recomputed clockNow.
   if (delay > 24) {
-    if (time < Infinity) timeout = setTimeout(wake, delay);
+    if (time < Infinity) timeout = setTimeout(wake, time - clock.now() - clockSkew);
     if (interval) interval = clearInterval(interval);
   } else {
-    if (!interval) clockLast = clockNow, interval = setInterval(poke, pokeDelay);
+    if (!interval) clockLast = clock.now(), interval = setInterval(poke, pokeDelay);
     frame = 1, setFrame(wake);
   }
 }
@@ -3272,7 +3290,7 @@ function create(node, id, self) {
 
 var interrupt = function(node, name) {
   var schedules = node.__transition,
-      schedule,
+      schedule$$1,
       active,
       empty = true,
       i;
@@ -3282,11 +3300,11 @@ var interrupt = function(node, name) {
   name = name == null ? null : name + "";
 
   for (i in schedules) {
-    if ((schedule = schedules[i]).name !== name) { empty = false; continue; }
-    active = schedule.state > STARTING && schedule.state < ENDING;
-    schedule.state = ENDED;
-    schedule.timer.stop();
-    if (active) schedule.on.call("interrupt", node, node.__data__, schedule.index, schedule.group);
+    if ((schedule$$1 = schedules[i]).name !== name) { empty = false; continue; }
+    active = schedule$$1.state > STARTING && schedule$$1.state < ENDING;
+    schedule$$1.state = ENDED;
+    schedule$$1.timer.stop();
+    if (active) schedule$$1.on.call("interrupt", node, node.__data__, schedule$$1.index, schedule$$1.group);
     delete schedules[i];
   }
 
@@ -3302,8 +3320,8 @@ var selection_interrupt = function(name) {
 function tweenRemove(id, name) {
   var tween0, tween1;
   return function() {
-    var schedule = set$1(this, id),
-        tween = schedule.tween;
+    var schedule$$1 = set$1(this, id),
+        tween = schedule$$1.tween;
 
     // If this node shared tween with the previous node,
     // just assign the updated shared tween and we’re done!
@@ -3319,7 +3337,7 @@ function tweenRemove(id, name) {
       }
     }
 
-    schedule.tween = tween1;
+    schedule$$1.tween = tween1;
   };
 }
 
@@ -3327,8 +3345,8 @@ function tweenFunction(id, name, value) {
   var tween0, tween1;
   if (typeof value !== "function") throw new Error;
   return function() {
-    var schedule = set$1(this, id),
-        tween = schedule.tween;
+    var schedule$$1 = set$1(this, id),
+        tween = schedule$$1.tween;
 
     // If this node shared tween with the previous node,
     // just assign the updated shared tween and we’re done!
@@ -3344,7 +3362,7 @@ function tweenFunction(id, name, value) {
       if (i === n) tween1.push(t);
     }
 
-    schedule.tween = tween1;
+    schedule$$1.tween = tween1;
   };
 }
 
@@ -3370,8 +3388,8 @@ function tweenValue(transition, name, value) {
   var id = transition._id;
 
   transition.each(function() {
-    var schedule = set$1(this, id);
-    (schedule.value || (schedule.value = {}))[name] = value.apply(this, arguments);
+    var schedule$$1 = set$1(this, id);
+    (schedule$$1.value || (schedule$$1.value = {}))[name] = value.apply(this, arguments);
   });
 
   return function(node) {
@@ -3379,7 +3397,7 @@ function tweenValue(transition, name, value) {
   };
 }
 
-var interpolate$$1 = function(a, b) {
+var interpolate = function(a, b) {
   var c;
   return (typeof b === "number" ? reinterpolate
       : b instanceof color ? interpolateRgb
@@ -3450,7 +3468,7 @@ function attrFunctionNS$1(fullname, interpolate$$1, value) {
 }
 
 var transition_attr = function(name, value) {
-  var fullname = namespace(name), i = fullname === "transform" ? interpolateTransformSvg : interpolate$$1;
+  var fullname = namespace(name), i = fullname === "transform" ? interpolateTransformSvg : interpolate;
   return this.attrTween(name, typeof value === "function"
       ? (fullname.local ? attrFunctionNS$1 : attrFunction$1)(fullname, i, tweenValue(this, "attr." + name, value))
       : value == null ? (fullname.local ? attrRemoveNS$1 : attrRemove$1)(fullname)
@@ -3561,10 +3579,10 @@ var transition_filter = function(match) {
   return new Transition(subgroups, this._parents, this._name, this._id);
 };
 
-var transition_merge = function(transition) {
-  if (transition._id !== this._id) throw new Error;
+var transition_merge = function(transition$$1) {
+  if (transition$$1._id !== this._id) throw new Error;
 
-  for (var groups0 = this._groups, groups1 = transition._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {
+  for (var groups0 = this._groups, groups1 = transition$$1._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {
     for (var group0 = groups0[j], group1 = groups1[j], n = group0.length, merge = merges[j] = new Array(n), node, i = 0; i < n; ++i) {
       if (node = group0[i] || group1[i]) {
         merge[i] = node;
@@ -3590,15 +3608,15 @@ function start(name) {
 function onFunction(id, name, listener) {
   var on0, on1, sit = start(name) ? init : set$1;
   return function() {
-    var schedule = sit(this, id),
-        on = schedule.on;
+    var schedule$$1 = sit(this, id),
+        on = schedule$$1.on;
 
     // If this node shared a dispatch with the previous node,
     // just assign the updated shared dispatch and we’re done!
     // Otherwise, copy-on-write.
     if (on !== on0) (on1 = (on0 = on).copy()).on(name, listener);
 
-    schedule.on = on1;
+    schedule$$1.on = on1;
   };
 }
 
@@ -3622,15 +3640,15 @@ var transition_remove = function() {
   return this.on("end.remove", removeFunction(this._id));
 };
 
-var transition_select = function(select$$1) {
+var transition_select = function(select) {
   var name = this._name,
       id = this._id;
 
-  if (typeof select$$1 !== "function") select$$1 = selector(select$$1);
+  if (typeof select !== "function") select = selector(select);
 
   for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
     for (var group = groups[j], n = group.length, subgroup = subgroups[j] = new Array(n), node, subnode, i = 0; i < n; ++i) {
-      if ((node = group[i]) && (subnode = select$$1.call(node, node.__data__, i, group))) {
+      if ((node = group[i]) && (subnode = select.call(node, node.__data__, i, group))) {
         if ("__data__" in node) subnode.__data__ = node.__data__;
         subgroup[i] = subnode;
         schedule(subgroup[i], name, id, i, subgroup, get$1(node, id));
@@ -3641,16 +3659,16 @@ var transition_select = function(select$$1) {
   return new Transition(subgroups, this._parents, name, id);
 };
 
-var transition_selectAll = function(select$$1) {
+var transition_selectAll = function(select) {
   var name = this._name,
       id = this._id;
 
-  if (typeof select$$1 !== "function") select$$1 = selectorAll(select$$1);
+  if (typeof select !== "function") select = selectorAll(select);
 
   for (var groups = this._groups, m = groups.length, subgroups = [], parents = [], j = 0; j < m; ++j) {
     for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
       if (node = group[i]) {
-        for (var children = select$$1.call(node, node.__data__, i, group), child, inherit = get$1(node, id), k = 0, l = children.length; k < l; ++k) {
+        for (var children = select.call(node, node.__data__, i, group), child, inherit = get$1(node, id), k = 0, l = children.length; k < l; ++k) {
           if (child = children[k]) {
             schedule(child, name, id, k, children, inherit);
           }
@@ -3670,7 +3688,7 @@ var transition_selection = function() {
   return new Selection$1(this._groups, this._parents);
 };
 
-function styleRemove$1(name, interpolate$$2) {
+function styleRemove$1(name, interpolate$$1) {
   var value00,
       value10,
       interpolate0;
@@ -3679,7 +3697,7 @@ function styleRemove$1(name, interpolate$$2) {
         value1 = (this.style.removeProperty(name), styleValue(this, name));
     return value0 === value1 ? null
         : value0 === value00 && value1 === value10 ? interpolate0
-        : interpolate0 = interpolate$$2(value00 = value0, value10 = value1);
+        : interpolate0 = interpolate$$1(value00 = value0, value10 = value1);
   };
 }
 
@@ -3689,18 +3707,18 @@ function styleRemoveEnd(name) {
   };
 }
 
-function styleConstant$1(name, interpolate$$2, value1) {
+function styleConstant$1(name, interpolate$$1, value1) {
   var value00,
       interpolate0;
   return function() {
     var value0 = styleValue(this, name);
     return value0 === value1 ? null
         : value0 === value00 ? interpolate0
-        : interpolate0 = interpolate$$2(value00 = value0, value1);
+        : interpolate0 = interpolate$$1(value00 = value0, value1);
   };
 }
 
-function styleFunction$1(name, interpolate$$2, value) {
+function styleFunction$1(name, interpolate$$1, value) {
   var value00,
       value10,
       interpolate0;
@@ -3710,12 +3728,12 @@ function styleFunction$1(name, interpolate$$2, value) {
     if (value1 == null) value1 = (this.style.removeProperty(name), styleValue(this, name));
     return value0 === value1 ? null
         : value0 === value00 && value1 === value10 ? interpolate0
-        : interpolate0 = interpolate$$2(value00 = value0, value10 = value1);
+        : interpolate0 = interpolate$$1(value00 = value0, value10 = value1);
   };
 }
 
 var transition_style = function(name, value, priority) {
-  var i = (name += "") === "transform" ? interpolateTransformCss : interpolate$$1;
+  var i = (name += "") === "transform" ? interpolateTransformCss : interpolate;
   return value == null ? this
           .styleTween(name, styleRemove$1(name, i))
           .on("end.style." + name, styleRemoveEnd(name))
@@ -4086,13 +4104,13 @@ var root$1 = [null];
 
 var active = function(node, name) {
   var schedules = node.__transition,
-      schedule,
+      schedule$$1,
       i;
 
   if (schedules) {
     name = name == null ? null : name + "";
     for (i in schedules) {
-      if ((schedule = schedules[i]).state > SCHEDULED && schedule.name === name) {
+      if ((schedule$$1 = schedules[i]).state > SCHEDULED && schedule$$1.name === name) {
         return new Transition([[node]], root$1, name, +i);
       }
     }
@@ -4220,7 +4238,7 @@ function defaultExtent() {
 }
 
 // Like d3.local, but with the name “__brush” rather than auto-generated.
-function local$$1(node) {
+function local(node) {
   while (!node.__brush) if (!(node = node.parentNode)) return;
   return node.__brush;
 }
@@ -4266,7 +4284,7 @@ function brush$1(dim) {
         .attr("cursor", cursors.overlay)
       .merge(overlay)
         .each(function() {
-          var extent = local$$1(this).extent;
+          var extent = local(this).extent;
           select(this)
               .attr("x", extent[0][0])
               .attr("y", extent[0][1])
@@ -4301,7 +4319,7 @@ function brush$1(dim) {
         .on("mousedown.brush touchstart.brush", started);
   }
 
-  brush.move = function(group, selection$$1) {
+  brush.move = function(group, selection) {
     if (group.selection) {
       group
           .on("start.brush", function() { emitter(this, arguments).beforestart().start(); })
@@ -4311,7 +4329,7 @@ function brush$1(dim) {
                 state = that.__brush,
                 emit = emitter(that, arguments),
                 selection0 = state.selection,
-                selection1 = dim.input(typeof selection$$1 === "function" ? selection$$1.apply(this, arguments) : selection$$1, state.extent),
+                selection1 = dim.input(typeof selection === "function" ? selection.apply(this, arguments) : selection, state.extent),
                 i = interpolateValue(selection0, selection1);
 
             function tween(t) {
@@ -4328,7 +4346,7 @@ function brush$1(dim) {
             var that = this,
                 args = arguments,
                 state = that.__brush,
-                selection1 = dim.input(typeof selection$$1 === "function" ? selection$$1.apply(that, args) : selection$$1, state.extent),
+                selection1 = dim.input(typeof selection === "function" ? selection.apply(that, args) : selection, state.extent),
                 emit = emitter(that, args).beforestart();
 
             interrupt(that);
@@ -4341,22 +4359,22 @@ function brush$1(dim) {
 
   function redraw() {
     var group = select(this),
-        selection$$1 = local$$1(this).selection;
+        selection = local(this).selection;
 
-    if (selection$$1) {
+    if (selection) {
       group.selectAll(".selection")
           .style("display", null)
-          .attr("x", selection$$1[0][0])
-          .attr("y", selection$$1[0][1])
-          .attr("width", selection$$1[1][0] - selection$$1[0][0])
-          .attr("height", selection$$1[1][1] - selection$$1[0][1]);
+          .attr("x", selection[0][0])
+          .attr("y", selection[0][1])
+          .attr("width", selection[1][0] - selection[0][0])
+          .attr("height", selection[1][1] - selection[0][1]);
 
       group.selectAll(".handle")
           .style("display", null)
-          .attr("x", function(d) { return d.type[d.type.length - 1] === "e" ? selection$$1[1][0] - handleSize / 2 : selection$$1[0][0] - handleSize / 2; })
-          .attr("y", function(d) { return d.type[0] === "s" ? selection$$1[1][1] - handleSize / 2 : selection$$1[0][1] - handleSize / 2; })
-          .attr("width", function(d) { return d.type === "n" || d.type === "s" ? selection$$1[1][0] - selection$$1[0][0] + handleSize : handleSize; })
-          .attr("height", function(d) { return d.type === "e" || d.type === "w" ? selection$$1[1][1] - selection$$1[0][1] + handleSize : handleSize; });
+          .attr("x", function(d) { return d.type[d.type.length - 1] === "e" ? selection[1][0] - handleSize / 2 : selection[0][0] - handleSize / 2; })
+          .attr("y", function(d) { return d.type[0] === "s" ? selection[1][1] - handleSize / 2 : selection[0][1] - handleSize / 2; })
+          .attr("width", function(d) { return d.type === "n" || d.type === "s" ? selection[1][0] - selection[0][0] + handleSize : handleSize; })
+          .attr("height", function(d) { return d.type === "e" || d.type === "w" ? selection[1][1] - selection[0][1] + handleSize : handleSize; });
     }
 
     else {
@@ -4412,9 +4430,9 @@ function brush$1(dim) {
         mode = (exports.event.metaKey ? type = "overlay" : type) === "selection" ? MODE_DRAG : (exports.event.altKey ? MODE_CENTER : MODE_HANDLE),
         signX = dim === Y ? null : signsX[type],
         signY = dim === X ? null : signsY[type],
-        state = local$$1(that),
+        state = local(that),
         extent = state.extent,
-        selection$$1 = state.selection,
+        selection = state.selection,
         W = extent[0][0], w0, w1,
         N = extent[0][1], n0, n1,
         E = extent[1][0], e0, e1,
@@ -4430,15 +4448,15 @@ function brush$1(dim) {
         emit = emitter(that, arguments).beforestart();
 
     if (type === "overlay") {
-      state.selection = selection$$1 = [
+      state.selection = selection = [
         [w0 = dim === Y ? W : point0[0], n0 = dim === X ? N : point0[1]],
         [e0 = dim === Y ? E : w0, s0 = dim === X ? S : n0]
       ];
     } else {
-      w0 = selection$$1[0][0];
-      n0 = selection$$1[0][1];
-      e0 = selection$$1[1][0];
-      s0 = selection$$1[1][1];
+      w0 = selection[0][0];
+      n0 = selection[0][1];
+      e0 = selection[1][0];
+      s0 = selection[1][1];
     }
 
     w1 = w0;
@@ -4524,14 +4542,14 @@ function brush$1(dim) {
         if (type in flipY) overlay.attr("cursor", cursors[type = flipY[type]]);
       }
 
-      if (state.selection) selection$$1 = state.selection; // May be set by brush.move!
-      if (lockX) w1 = selection$$1[0][0], e1 = selection$$1[1][0];
-      if (lockY) n1 = selection$$1[0][1], s1 = selection$$1[1][1];
+      if (state.selection) selection = state.selection; // May be set by brush.move!
+      if (lockX) w1 = selection[0][0], e1 = selection[1][0];
+      if (lockY) n1 = selection[0][1], s1 = selection[1][1];
 
-      if (selection$$1[0][0] !== w1
-          || selection$$1[0][1] !== n1
-          || selection$$1[1][0] !== e1
-          || selection$$1[1][1] !== s1) {
+      if (selection[0][0] !== w1
+          || selection[0][1] !== n1
+          || selection[1][0] !== e1
+          || selection[1][1] !== s1) {
         state.selection = [[w1, n1], [e1, s1]];
         redraw.call(that);
         emit.brush();
@@ -4551,8 +4569,8 @@ function brush$1(dim) {
       }
       group.attr("pointer-events", "all");
       overlay.attr("cursor", cursors.overlay);
-      if (state.selection) selection$$1 = state.selection; // May be set by brush.move (on start)!
-      if (empty(selection$$1)) state.selection = null, redraw.call(that);
+      if (state.selection) selection = state.selection; // May be set by brush.move (on start)!
+      if (empty(selection)) state.selection = null, redraw.call(that);
       emit.end();
     }
 
@@ -5081,10 +5099,10 @@ var nest = function() {
       nest;
 
   function apply(array, depth, createResult, setResult) {
-    if (depth >= keys.length) return rollup != null
-        ? rollup(array) : (sortValues != null
-        ? array.sort(sortValues)
-        : array);
+    if (depth >= keys.length) {
+      if (sortValues != null) array.sort(sortValues);
+      return rollup != null ? rollup(array) : array;
+    }
 
     var i = -1,
         n = array.length,
@@ -5199,6 +5217,12 @@ var entries = function(map) {
   return entries;
 };
 
+var EOL = {};
+var EOF = {};
+var QUOTE = 34;
+var NEWLINE = 10;
+var RETURN = 13;
+
 function objectConverter(columns) {
   return new Function("d", "return {" + columns.map(function(name, i) {
     return JSON.stringify(name) + ": d[" + i + "]";
@@ -5230,7 +5254,7 @@ function inferColumns(rows) {
 
 var dsv = function(delimiter) {
   var reFormat = new RegExp("[\"" + delimiter + "\n\r]"),
-      delimiterCode = delimiter.charCodeAt(0);
+      DELIMITER = delimiter.charCodeAt(0);
 
   function parse(text, f) {
     var convert, columns, rows = parseRows(text, function(row, i) {
@@ -5242,62 +5266,49 @@ var dsv = function(delimiter) {
   }
 
   function parseRows(text, f) {
-    var EOL = {}, // sentinel value for end-of-line
-        EOF = {}, // sentinel value for end-of-file
-        rows = [], // output rows
+    var rows = [], // output rows
         N = text.length,
         I = 0, // current character index
-        n = 0, // the current line number
-        t, // the current token
-        eol; // is the current token followed by EOL?
+        n = 0, // current line number
+        t, // current token
+        eof = N <= 0, // current token followed by EOF?
+        eol = false; // current token followed by EOL?
+
+    // Strip the trailing newline.
+    if (text.charCodeAt(N - 1) === NEWLINE) --N;
+    if (text.charCodeAt(N - 1) === RETURN) --N;
 
     function token() {
-      if (I >= N) return EOF; // special case: end of file
-      if (eol) return eol = false, EOL; // special case: end of line
+      if (eof) return EOF;
+      if (eol) return eol = false, EOL;
 
-      // special case: quotes
-      var j = I, c;
-      if (text.charCodeAt(j) === 34) {
-        var i = j;
-        while (i++ < N) {
-          if (text.charCodeAt(i) === 34) {
-            if (text.charCodeAt(i + 1) !== 34) break;
-            ++i;
-          }
-        }
-        I = i + 2;
-        c = text.charCodeAt(i + 1);
-        if (c === 13) {
-          eol = true;
-          if (text.charCodeAt(i + 2) === 10) ++I;
-        } else if (c === 10) {
-          eol = true;
-        }
-        return text.slice(j + 1, i).replace(/""/g, "\"");
+      // Unescape quotes.
+      var i, j = I, c;
+      if (text.charCodeAt(j) === QUOTE) {
+        while (I++ < N && text.charCodeAt(I) !== QUOTE || text.charCodeAt(++I) === QUOTE);
+        if ((i = I) >= N) eof = true;
+        else if ((c = text.charCodeAt(I++)) === NEWLINE) eol = true;
+        else if (c === RETURN) { eol = true; if (text.charCodeAt(I) === NEWLINE) ++I; }
+        return text.slice(j + 1, i - 1).replace(/""/g, "\"");
       }
 
-      // common case: find next delimiter or newline
+      // Find next delimiter or newline.
       while (I < N) {
-        var k = 1;
-        c = text.charCodeAt(I++);
-        if (c === 10) eol = true; // \n
-        else if (c === 13) { eol = true; if (text.charCodeAt(I) === 10) ++I, ++k; } // \r|\r\n
-        else if (c !== delimiterCode) continue;
-        return text.slice(j, I - k);
+        if ((c = text.charCodeAt(i = I++)) === NEWLINE) eol = true;
+        else if (c === RETURN) { eol = true; if (text.charCodeAt(I) === NEWLINE) ++I; }
+        else if (c !== DELIMITER) continue;
+        return text.slice(j, i);
       }
 
-      // special case: last token before EOF
-      return text.slice(j);
+      // Return last token before EOF.
+      return eof = true, text.slice(j, N);
     }
 
     while ((t = token()) !== EOF) {
-      var a = [];
-      while (t !== EOL && t !== EOF) {
-        a.push(t);
-        t = token();
-      }
-      if (f && (a = f(a, n++)) == null) continue;
-      rows.push(a);
+      var row = [];
+      while (t !== EOL && t !== EOF) row.push(t), t = token();
+      if (f && (row = f(row, n++)) == null) continue;
+      rows.push(row);
     }
 
     return rows;
@@ -5322,7 +5333,7 @@ var dsv = function(delimiter) {
 
   function formatValue(text) {
     return text == null ? ""
-        : reFormat.test(text += "") ? "\"" + text.replace(/\"/g, "\"\"") + "\""
+        : reFormat.test(text += "") ? "\"" + text.replace(/"/g, "\"\"") + "\""
         : text;
   }
 
@@ -6189,17 +6200,17 @@ var manyBody = function() {
   }
 
   function accumulate(quad) {
-    var strength = 0, q, c, x$$1, y$$1, i;
+    var strength = 0, q, c, weight = 0, x, y, i;
 
     // For internal nodes, accumulate forces from child quadrants.
     if (quad.length) {
-      for (x$$1 = y$$1 = i = 0; i < 4; ++i) {
-        if ((q = quad[i]) && (c = q.value)) {
-          strength += c, x$$1 += c * q.x, y$$1 += c * q.y;
+      for (x = y = i = 0; i < 4; ++i) {
+        if ((q = quad[i]) && (c = Math.abs(q.value))) {
+          strength += q.value, weight += c, x += c * q.x, y += c * q.y;
         }
       }
-      quad.x = x$$1 / strength;
-      quad.y = y$$1 / strength;
+      quad.x = x / weight;
+      quad.y = y / weight;
     }
 
     // For leaf nodes, accumulate forces from coincident quadrants.
@@ -6217,20 +6228,20 @@ var manyBody = function() {
   function apply(quad, x1, _, x2) {
     if (!quad.value) return true;
 
-    var x$$1 = quad.x - node.x,
-        y$$1 = quad.y - node.y,
+    var x = quad.x - node.x,
+        y = quad.y - node.y,
         w = x2 - x1,
-        l = x$$1 * x$$1 + y$$1 * y$$1;
+        l = x * x + y * y;
 
     // Apply the Barnes-Hut approximation if possible.
     // Limit forces for very close nodes; randomize direction if coincident.
     if (w * w / theta2 < l) {
       if (l < distanceMax2) {
-        if (x$$1 === 0) x$$1 = jiggle(), l += x$$1 * x$$1;
-        if (y$$1 === 0) y$$1 = jiggle(), l += y$$1 * y$$1;
+        if (x === 0) x = jiggle(), l += x * x;
+        if (y === 0) y = jiggle(), l += y * y;
         if (l < distanceMin2) l = Math.sqrt(distanceMin2 * l);
-        node.vx += x$$1 * quad.value * alpha / l;
-        node.vy += y$$1 * quad.value * alpha / l;
+        node.vx += x * quad.value * alpha / l;
+        node.vy += y * quad.value * alpha / l;
       }
       return true;
     }
@@ -6240,15 +6251,15 @@ var manyBody = function() {
 
     // Limit forces for very close nodes; randomize direction if coincident.
     if (quad.data !== node || quad.next) {
-      if (x$$1 === 0) x$$1 = jiggle(), l += x$$1 * x$$1;
-      if (y$$1 === 0) y$$1 = jiggle(), l += y$$1 * y$$1;
+      if (x === 0) x = jiggle(), l += x * x;
+      if (y === 0) y = jiggle(), l += y * y;
       if (l < distanceMin2) l = Math.sqrt(distanceMin2 * l);
     }
 
     do if (quad.data !== node) {
       w = strengths[quad.data.index] * alpha / l;
-      node.vx += x$$1 * w;
-      node.vy += y$$1 * w;
+      node.vx += x * w;
+      node.vy += y * w;
     } while (quad = quad.next);
   }
 
@@ -6276,6 +6287,62 @@ var manyBody = function() {
   return force;
 };
 
+var radial = function(radius, x, y) {
+  var nodes,
+      strength = constant$6(0.1),
+      strengths,
+      radiuses;
+
+  if (typeof radius !== "function") radius = constant$6(+radius);
+  if (x == null) x = 0;
+  if (y == null) y = 0;
+
+  function force(alpha) {
+    for (var i = 0, n = nodes.length; i < n; ++i) {
+      var node = nodes[i],
+          dx = node.x - x || 1e-6,
+          dy = node.y - y || 1e-6,
+          r = Math.sqrt(dx * dx + dy * dy),
+          k = (radiuses[i] - r) * strengths[i] * alpha / r;
+      node.vx += dx * k;
+      node.vy += dy * k;
+    }
+  }
+
+  function initialize() {
+    if (!nodes) return;
+    var i, n = nodes.length;
+    strengths = new Array(n);
+    radiuses = new Array(n);
+    for (i = 0; i < n; ++i) {
+      radiuses[i] = +radius(nodes[i], i, nodes);
+      strengths[i] = isNaN(radiuses[i]) ? 0 : +strength(nodes[i], i, nodes);
+    }
+  }
+
+  force.initialize = function(_) {
+    nodes = _, initialize();
+  };
+
+  force.strength = function(_) {
+    return arguments.length ? (strength = typeof _ === "function" ? _ : constant$6(+_), initialize(), force) : strength;
+  };
+
+  force.radius = function(_) {
+    return arguments.length ? (radius = typeof _ === "function" ? _ : constant$6(+_), initialize(), force) : radius;
+  };
+
+  force.x = function(_) {
+    return arguments.length ? (x = +_, force) : x;
+  };
+
+  force.y = function(_) {
+    return arguments.length ? (y = +_, force) : y;
+  };
+
+  return force;
+};
+
 var x$2 = function(x) {
   var strength = constant$6(0.1),
       nodes,
@@ -6639,7 +6706,7 @@ var formatLocale = function(locale) {
   };
 };
 
-var locale$1;
+var locale;
 
 
 
@@ -6651,10 +6718,10 @@ defaultLocale({
 });
 
 function defaultLocale(definition) {
-  locale$1 = formatLocale(definition);
-  exports.format = locale$1.format;
-  exports.formatPrefix = locale$1.formatPrefix;
-  return locale$1;
+  locale = formatLocale(definition);
+  exports.format = locale.format;
+  exports.formatPrefix = locale.formatPrefix;
+  return locale;
 }
 
 var precisionFixed = function(step) {
@@ -7427,66 +7494,6 @@ var clipBuffer = function() {
   };
 };
 
-var clipLine = function(a, b, x0, y0, x1, y1) {
-  var ax = a[0],
-      ay = a[1],
-      bx = b[0],
-      by = b[1],
-      t0 = 0,
-      t1 = 1,
-      dx = bx - ax,
-      dy = by - ay,
-      r;
-
-  r = x0 - ax;
-  if (!dx && r > 0) return;
-  r /= dx;
-  if (dx < 0) {
-    if (r < t0) return;
-    if (r < t1) t1 = r;
-  } else if (dx > 0) {
-    if (r > t1) return;
-    if (r > t0) t0 = r;
-  }
-
-  r = x1 - ax;
-  if (!dx && r < 0) return;
-  r /= dx;
-  if (dx < 0) {
-    if (r > t1) return;
-    if (r > t0) t0 = r;
-  } else if (dx > 0) {
-    if (r < t0) return;
-    if (r < t1) t1 = r;
-  }
-
-  r = y0 - ay;
-  if (!dy && r > 0) return;
-  r /= dy;
-  if (dy < 0) {
-    if (r < t0) return;
-    if (r < t1) t1 = r;
-  } else if (dy > 0) {
-    if (r > t1) return;
-    if (r > t0) t0 = r;
-  }
-
-  r = y1 - ay;
-  if (!dy && r < 0) return;
-  r /= dy;
-  if (dy < 0) {
-    if (r > t1) return;
-    if (r > t0) t0 = r;
-  } else if (dy > 0) {
-    if (r < t0) return;
-    if (r < t1) t1 = r;
-  }
-
-  if (t0 > 0) a[0] = ax + t0 * dx, a[1] = ay + t0 * dy;
-  if (t1 < 1) b[0] = ax + t1 * dx, b[1] = ay + t1 * dy;
-  return true;
-};
-
 var pointEqual = function(a, b) {
   return abs(a[0] - b[0]) < epsilon$2 && abs(a[1] - b[1]) < epsilon$2;
 };
@@ -7503,7 +7510,7 @@ function Intersection(point, points, other, entry) {
 // A generalized polygon clipping algorithm: given a polygon that has been cut
 // into its visible line segments, and rejoins the segments by interpolating
 // along the clip edge.
-var clipPolygon = function(segments, compareIntersection, startInside, interpolate, stream) {
+var clipRejoin = function(segments, compareIntersection, startInside, interpolate, stream) {
   var subject = [],
       clip = [],
       i,
@@ -7591,13 +7598,531 @@ function link$1(array) {
   b.p = a;
 }
 
+var sum$1 = adder();
+
+var polygonContains = function(polygon, point) {
+  var lambda = point[0],
+      phi = point[1],
+      normal = [sin$1(lambda), -cos$1(lambda), 0],
+      angle = 0,
+      winding = 0;
+
+  sum$1.reset();
+
+  for (var i = 0, n = polygon.length; i < n; ++i) {
+    if (!(m = (ring = polygon[i]).length)) continue;
+    var ring,
+        m,
+        point0 = ring[m - 1],
+        lambda0 = point0[0],
+        phi0 = point0[1] / 2 + quarterPi,
+        sinPhi0 = sin$1(phi0),
+        cosPhi0 = cos$1(phi0);
+
+    for (var j = 0; j < m; ++j, lambda0 = lambda1, sinPhi0 = sinPhi1, cosPhi0 = cosPhi1, point0 = point1) {
+      var point1 = ring[j],
+          lambda1 = point1[0],
+          phi1 = point1[1] / 2 + quarterPi,
+          sinPhi1 = sin$1(phi1),
+          cosPhi1 = cos$1(phi1),
+          delta = lambda1 - lambda0,
+          sign$$1 = delta >= 0 ? 1 : -1,
+          absDelta = sign$$1 * delta,
+          antimeridian = absDelta > pi$3,
+          k = sinPhi0 * sinPhi1;
+
+      sum$1.add(atan2(k * sign$$1 * sin$1(absDelta), cosPhi0 * cosPhi1 + k * cos$1(absDelta)));
+      angle += antimeridian ? delta + sign$$1 * tau$3 : delta;
+
+      // Are the longitudes either side of the point’s meridian (lambda),
+      // and are the latitudes smaller than the parallel (phi)?
+      if (antimeridian ^ lambda0 >= lambda ^ lambda1 >= lambda) {
+        var arc = cartesianCross(cartesian(point0), cartesian(point1));
+        cartesianNormalizeInPlace(arc);
+        var intersection = cartesianCross(normal, arc);
+        cartesianNormalizeInPlace(intersection);
+        var phiArc = (antimeridian ^ delta >= 0 ? -1 : 1) * asin(intersection[2]);
+        if (phi > phiArc || phi === phiArc && (arc[0] || arc[1])) {
+          winding += antimeridian ^ delta >= 0 ? 1 : -1;
+        }
+      }
+    }
+  }
+
+  // First, determine whether the South pole is inside or outside:
+  //
+  // It is inside if:
+  // * the polygon winds around it in a clockwise direction.
+  // * the polygon does not (cumulatively) wind around it, but has a negative
+  //   (counter-clockwise) area.
+  //
+  // Second, count the (signed) number of times a segment crosses a lambda
+  // from the point to the South pole.  If it is zero, then the point is the
+  // same side as the South pole.
+
+  return (angle < -epsilon$2 || angle < epsilon$2 && sum$1 < -epsilon$2) ^ (winding & 1);
+};
+
+var clip = function(pointVisible, clipLine, interpolate, start) {
+  return function(sink) {
+    var line = clipLine(sink),
+        ringBuffer = clipBuffer(),
+        ringSink = clipLine(ringBuffer),
+        polygonStarted = false,
+        polygon,
+        segments,
+        ring;
+
+    var clip = {
+      point: point,
+      lineStart: lineStart,
+      lineEnd: lineEnd,
+      polygonStart: function() {
+        clip.point = pointRing;
+        clip.lineStart = ringStart;
+        clip.lineEnd = ringEnd;
+        segments = [];
+        polygon = [];
+      },
+      polygonEnd: function() {
+        clip.point = point;
+        clip.lineStart = lineStart;
+        clip.lineEnd = lineEnd;
+        segments = merge(segments);
+        var startInside = polygonContains(polygon, start);
+        if (segments.length) {
+          if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
+          clipRejoin(segments, compareIntersection, startInside, interpolate, sink);
+        } else if (startInside) {
+          if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
+          sink.lineStart();
+          interpolate(null, null, 1, sink);
+          sink.lineEnd();
+        }
+        if (polygonStarted) sink.polygonEnd(), polygonStarted = false;
+        segments = polygon = null;
+      },
+      sphere: function() {
+        sink.polygonStart();
+        sink.lineStart();
+        interpolate(null, null, 1, sink);
+        sink.lineEnd();
+        sink.polygonEnd();
+      }
+    };
+
+    function point(lambda, phi) {
+      if (pointVisible(lambda, phi)) sink.point(lambda, phi);
+    }
+
+    function pointLine(lambda, phi) {
+      line.point(lambda, phi);
+    }
+
+    function lineStart() {
+      clip.point = pointLine;
+      line.lineStart();
+    }
+
+    function lineEnd() {
+      clip.point = point;
+      line.lineEnd();
+    }
+
+    function pointRing(lambda, phi) {
+      ring.push([lambda, phi]);
+      ringSink.point(lambda, phi);
+    }
+
+    function ringStart() {
+      ringSink.lineStart();
+      ring = [];
+    }
+
+    function ringEnd() {
+      pointRing(ring[0][0], ring[0][1]);
+      ringSink.lineEnd();
+
+      var clean = ringSink.clean(),
+          ringSegments = ringBuffer.result(),
+          i, n = ringSegments.length, m,
+          segment,
+          point;
+
+      ring.pop();
+      polygon.push(ring);
+      ring = null;
+
+      if (!n) return;
+
+      // No intersections.
+      if (clean & 1) {
+        segment = ringSegments[0];
+        if ((m = segment.length - 1) > 0) {
+          if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
+          sink.lineStart();
+          for (i = 0; i < m; ++i) sink.point((point = segment[i])[0], point[1]);
+          sink.lineEnd();
+        }
+        return;
+      }
+
+      // Rejoin connected segments.
+      // TODO reuse ringBuffer.rejoin()?
+      if (n > 1 && clean & 2) ringSegments.push(ringSegments.pop().concat(ringSegments.shift()));
+
+      segments.push(ringSegments.filter(validSegment));
+    }
+
+    return clip;
+  };
+};
+
+function validSegment(segment) {
+  return segment.length > 1;
+}
+
+// Intersections are sorted along the clip edge. For both antimeridian cutting
+// and circle clipping, the same comparison is used.
+function compareIntersection(a, b) {
+  return ((a = a.x)[0] < 0 ? a[1] - halfPi$2 - epsilon$2 : halfPi$2 - a[1])
+       - ((b = b.x)[0] < 0 ? b[1] - halfPi$2 - epsilon$2 : halfPi$2 - b[1]);
+}
+
+var clipAntimeridian = clip(
+  function() { return true; },
+  clipAntimeridianLine,
+  clipAntimeridianInterpolate,
+  [-pi$3, -halfPi$2]
+);
+
+// Takes a line and cuts into visible segments. Return values: 0 - there were
+// intersections or the line was empty; 1 - no intersections; 2 - there were
+// intersections, and the first and last segments should be rejoined.
+function clipAntimeridianLine(stream) {
+  var lambda0 = NaN,
+      phi0 = NaN,
+      sign0 = NaN,
+      clean; // no intersections
+
+  return {
+    lineStart: function() {
+      stream.lineStart();
+      clean = 1;
+    },
+    point: function(lambda1, phi1) {
+      var sign1 = lambda1 > 0 ? pi$3 : -pi$3,
+          delta = abs(lambda1 - lambda0);
+      if (abs(delta - pi$3) < epsilon$2) { // line crosses a pole
+        stream.point(lambda0, phi0 = (phi0 + phi1) / 2 > 0 ? halfPi$2 : -halfPi$2);
+        stream.point(sign0, phi0);
+        stream.lineEnd();
+        stream.lineStart();
+        stream.point(sign1, phi0);
+        stream.point(lambda1, phi0);
+        clean = 0;
+      } else if (sign0 !== sign1 && delta >= pi$3) { // line crosses antimeridian
+        if (abs(lambda0 - sign0) < epsilon$2) lambda0 -= sign0 * epsilon$2; // handle degeneracies
+        if (abs(lambda1 - sign1) < epsilon$2) lambda1 -= sign1 * epsilon$2;
+        phi0 = clipAntimeridianIntersect(lambda0, phi0, lambda1, phi1);
+        stream.point(sign0, phi0);
+        stream.lineEnd();
+        stream.lineStart();
+        stream.point(sign1, phi0);
+        clean = 0;
+      }
+      stream.point(lambda0 = lambda1, phi0 = phi1);
+      sign0 = sign1;
+    },
+    lineEnd: function() {
+      stream.lineEnd();
+      lambda0 = phi0 = NaN;
+    },
+    clean: function() {
+      return 2 - clean; // if intersections, rejoin first and last segments
+    }
+  };
+}
+
+function clipAntimeridianIntersect(lambda0, phi0, lambda1, phi1) {
+  var cosPhi0,
+      cosPhi1,
+      sinLambda0Lambda1 = sin$1(lambda0 - lambda1);
+  return abs(sinLambda0Lambda1) > epsilon$2
+      ? atan((sin$1(phi0) * (cosPhi1 = cos$1(phi1)) * sin$1(lambda1)
+          - sin$1(phi1) * (cosPhi0 = cos$1(phi0)) * sin$1(lambda0))
+          / (cosPhi0 * cosPhi1 * sinLambda0Lambda1))
+      : (phi0 + phi1) / 2;
+}
+
+function clipAntimeridianInterpolate(from, to, direction, stream) {
+  var phi;
+  if (from == null) {
+    phi = direction * halfPi$2;
+    stream.point(-pi$3, phi);
+    stream.point(0, phi);
+    stream.point(pi$3, phi);
+    stream.point(pi$3, 0);
+    stream.point(pi$3, -phi);
+    stream.point(0, -phi);
+    stream.point(-pi$3, -phi);
+    stream.point(-pi$3, 0);
+    stream.point(-pi$3, phi);
+  } else if (abs(from[0] - to[0]) > epsilon$2) {
+    var lambda = from[0] < to[0] ? pi$3 : -pi$3;
+    phi = direction * lambda / 2;
+    stream.point(-lambda, phi);
+    stream.point(0, phi);
+    stream.point(lambda, phi);
+  } else {
+    stream.point(to[0], to[1]);
+  }
+}
+
+var clipCircle = function(radius) {
+  var cr = cos$1(radius),
+      delta = 6 * radians,
+      smallRadius = cr > 0,
+      notHemisphere = abs(cr) > epsilon$2; // TODO optimise for this common case
+
+  function interpolate(from, to, direction, stream) {
+    circleStream(stream, radius, delta, direction, from, to);
+  }
+
+  function visible(lambda, phi) {
+    return cos$1(lambda) * cos$1(phi) > cr;
+  }
+
+  // Takes a line and cuts into visible segments. Return values used for polygon
+  // clipping: 0 - there were intersections or the line was empty; 1 - no
+  // intersections 2 - there were intersections, and the first and last segments
+  // should be rejoined.
+  function clipLine(stream) {
+    var point0, // previous point
+        c0, // code for previous point
+        v0, // visibility of previous point
+        v00, // visibility of first point
+        clean; // no intersections
+    return {
+      lineStart: function() {
+        v00 = v0 = false;
+        clean = 1;
+      },
+      point: function(lambda, phi) {
+        var point1 = [lambda, phi],
+            point2,
+            v = visible(lambda, phi),
+            c = smallRadius
+              ? v ? 0 : code(lambda, phi)
+              : v ? code(lambda + (lambda < 0 ? pi$3 : -pi$3), phi) : 0;
+        if (!point0 && (v00 = v0 = v)) stream.lineStart();
+        // Handle degeneracies.
+        // TODO ignore if not clipping polygons.
+        if (v !== v0) {
+          point2 = intersect(point0, point1);
+          if (!point2 || pointEqual(point0, point2) || pointEqual(point1, point2)) {
+            point1[0] += epsilon$2;
+            point1[1] += epsilon$2;
+            v = visible(point1[0], point1[1]);
+          }
+        }
+        if (v !== v0) {
+          clean = 0;
+          if (v) {
+            // outside going in
+            stream.lineStart();
+            point2 = intersect(point1, point0);
+            stream.point(point2[0], point2[1]);
+          } else {
+            // inside going out
+            point2 = intersect(point0, point1);
+            stream.point(point2[0], point2[1]);
+            stream.lineEnd();
+          }
+          point0 = point2;
+        } else if (notHemisphere && point0 && smallRadius ^ v) {
+          var t;
+          // If the codes for two points are different, or are both zero,
+          // and there this segment intersects with the small circle.
+          if (!(c & c0) && (t = intersect(point1, point0, true))) {
+            clean = 0;
+            if (smallRadius) {
+              stream.lineStart();
+              stream.point(t[0][0], t[0][1]);
+              stream.point(t[1][0], t[1][1]);
+              stream.lineEnd();
+            } else {
+              stream.point(t[1][0], t[1][1]);
+              stream.lineEnd();
+              stream.lineStart();
+              stream.point(t[0][0], t[0][1]);
+            }
+          }
+        }
+        if (v && (!point0 || !pointEqual(point0, point1))) {
+          stream.point(point1[0], point1[1]);
+        }
+        point0 = point1, v0 = v, c0 = c;
+      },
+      lineEnd: function() {
+        if (v0) stream.lineEnd();
+        point0 = null;
+      },
+      // Rejoin first and last segments if there were intersections and the first
+      // and last points were visible.
+      clean: function() {
+        return clean | ((v00 && v0) << 1);
+      }
+    };
+  }
+
+  // Intersects the great circle between a and b with the clip circle.
+  function intersect(a, b, two) {
+    var pa = cartesian(a),
+        pb = cartesian(b);
+
+    // We have two planes, n1.p = d1 and n2.p = d2.
+    // Find intersection line p(t) = c1 n1 + c2 n2 + t (n1 ⨯ n2).
+    var n1 = [1, 0, 0], // normal
+        n2 = cartesianCross(pa, pb),
+        n2n2 = cartesianDot(n2, n2),
+        n1n2 = n2[0], // cartesianDot(n1, n2),
+        determinant = n2n2 - n1n2 * n1n2;
+
+    // Two polar points.
+    if (!determinant) return !two && a;
+
+    var c1 =  cr * n2n2 / determinant,
+        c2 = -cr * n1n2 / determinant,
+        n1xn2 = cartesianCross(n1, n2),
+        A = cartesianScale(n1, c1),
+        B = cartesianScale(n2, c2);
+    cartesianAddInPlace(A, B);
+
+    // Solve |p(t)|^2 = 1.
+    var u = n1xn2,
+        w = cartesianDot(A, u),
+        uu = cartesianDot(u, u),
+        t2 = w * w - uu * (cartesianDot(A, A) - 1);
+
+    if (t2 < 0) return;
+
+    var t = sqrt(t2),
+        q = cartesianScale(u, (-w - t) / uu);
+    cartesianAddInPlace(q, A);
+    q = spherical(q);
+
+    if (!two) return q;
+
+    // Two intersection points.
+    var lambda0 = a[0],
+        lambda1 = b[0],
+        phi0 = a[1],
+        phi1 = b[1],
+        z;
+
+    if (lambda1 < lambda0) z = lambda0, lambda0 = lambda1, lambda1 = z;
+
+    var delta = lambda1 - lambda0,
+        polar = abs(delta - pi$3) < epsilon$2,
+        meridian = polar || delta < epsilon$2;
+
+    if (!polar && phi1 < phi0) z = phi0, phi0 = phi1, phi1 = z;
+
+    // Check that the first point is between a and b.
+    if (meridian
+        ? polar
+          ? phi0 + phi1 > 0 ^ q[1] < (abs(q[0] - lambda0) < epsilon$2 ? phi0 : phi1)
+          : phi0 <= q[1] && q[1] <= phi1
+        : delta > pi$3 ^ (lambda0 <= q[0] && q[0] <= lambda1)) {
+      var q1 = cartesianScale(u, (-w + t) / uu);
+      cartesianAddInPlace(q1, A);
+      return [q, spherical(q1)];
+    }
+  }
+
+  // Generates a 4-bit vector representing the location of a point relative to
+  // the small circle's bounding box.
+  function code(lambda, phi) {
+    var r = smallRadius ? radius : pi$3 - radius,
+        code = 0;
+    if (lambda < -r) code |= 1; // left
+    else if (lambda > r) code |= 2; // right
+    if (phi < -r) code |= 4; // below
+    else if (phi > r) code |= 8; // above
+    return code;
+  }
+
+  return clip(visible, clipLine, interpolate, smallRadius ? [0, -radius] : [-pi$3, radius - pi$3]);
+};
+
+var clipLine = function(a, b, x0, y0, x1, y1) {
+  var ax = a[0],
+      ay = a[1],
+      bx = b[0],
+      by = b[1],
+      t0 = 0,
+      t1 = 1,
+      dx = bx - ax,
+      dy = by - ay,
+      r;
+
+  r = x0 - ax;
+  if (!dx && r > 0) return;
+  r /= dx;
+  if (dx < 0) {
+    if (r < t0) return;
+    if (r < t1) t1 = r;
+  } else if (dx > 0) {
+    if (r > t1) return;
+    if (r > t0) t0 = r;
+  }
+
+  r = x1 - ax;
+  if (!dx && r < 0) return;
+  r /= dx;
+  if (dx < 0) {
+    if (r > t1) return;
+    if (r > t0) t0 = r;
+  } else if (dx > 0) {
+    if (r < t0) return;
+    if (r < t1) t1 = r;
+  }
+
+  r = y0 - ay;
+  if (!dy && r > 0) return;
+  r /= dy;
+  if (dy < 0) {
+    if (r < t0) return;
+    if (r < t1) t1 = r;
+  } else if (dy > 0) {
+    if (r > t1) return;
+    if (r > t0) t0 = r;
+  }
+
+  r = y1 - ay;
+  if (!dy && r < 0) return;
+  r /= dy;
+  if (dy < 0) {
+    if (r > t1) return;
+    if (r > t0) t0 = r;
+  } else if (dy > 0) {
+    if (r < t0) return;
+    if (r < t1) t1 = r;
+  }
+
+  if (t0 > 0) a[0] = ax + t0 * dx, a[1] = ay + t0 * dy;
+  if (t1 < 1) b[0] = ax + t1 * dx, b[1] = ay + t1 * dy;
+  return true;
+};
+
 var clipMax = 1e9;
 var clipMin = -clipMax;
 
 // TODO Use d3-polygon’s polygonContains here for the ring check?
 // TODO Eliminate duplicate buffering in clipBuffer and polygon.push?
 
-function clipExtent(x0, y0, x1, y1) {
+function clipRectangle(x0, y0, x1, y1) {
 
   function visible(x, y) {
     return x0 <= x && x <= x1 && y0 <= y && y <= y1;
@@ -7690,7 +8215,7 @@ function clipExtent(x0, y0, x1, y1) {
           stream.lineEnd();
         }
         if (visible) {
-          clipPolygon(segments, compareIntersection, startInside, interpolate, stream);
+          clipRejoin(segments, compareIntersection, startInside, interpolate, stream);
         }
         stream.polygonEnd();
       }
@@ -7766,7 +8291,7 @@ var extent$1 = function() {
 
   return clip = {
     stream: function(stream) {
-      return cache && cacheStream === stream ? cache : cache = clipExtent(x0, y0, x1, y1)(cacheStream = stream);
+      return cache && cacheStream === stream ? cache : cache = clipRectangle(x0, y0, x1, y1)(cacheStream = stream);
     },
     extent: function(_) {
       return arguments.length ? (x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1], cache = cacheStream = null, clip) : [[x0, y0], [x1, y1]];
@@ -7774,71 +8299,6 @@ var extent$1 = function() {
   };
 };
 
-var sum$1 = adder();
-
-var polygonContains = function(polygon, point) {
-  var lambda = point[0],
-      phi = point[1],
-      normal = [sin$1(lambda), -cos$1(lambda), 0],
-      angle = 0,
-      winding = 0;
-
-  sum$1.reset();
-
-  for (var i = 0, n = polygon.length; i < n; ++i) {
-    if (!(m = (ring = polygon[i]).length)) continue;
-    var ring,
-        m,
-        point0 = ring[m - 1],
-        lambda0 = point0[0],
-        phi0 = point0[1] / 2 + quarterPi,
-        sinPhi0 = sin$1(phi0),
-        cosPhi0 = cos$1(phi0);
-
-    for (var j = 0; j < m; ++j, lambda0 = lambda1, sinPhi0 = sinPhi1, cosPhi0 = cosPhi1, point0 = point1) {
-      var point1 = ring[j],
-          lambda1 = point1[0],
-          phi1 = point1[1] / 2 + quarterPi,
-          sinPhi1 = sin$1(phi1),
-          cosPhi1 = cos$1(phi1),
-          delta = lambda1 - lambda0,
-          sign$$1 = delta >= 0 ? 1 : -1,
-          absDelta = sign$$1 * delta,
-          antimeridian = absDelta > pi$3,
-          k = sinPhi0 * sinPhi1;
-
-      sum$1.add(atan2(k * sign$$1 * sin$1(absDelta), cosPhi0 * cosPhi1 + k * cos$1(absDelta)));
-      angle += antimeridian ? delta + sign$$1 * tau$3 : delta;
-
-      // Are the longitudes either side of the point’s meridian (lambda),
-      // and are the latitudes smaller than the parallel (phi)?
-      if (antimeridian ^ lambda0 >= lambda ^ lambda1 >= lambda) {
-        var arc = cartesianCross(cartesian(point0), cartesian(point1));
-        cartesianNormalizeInPlace(arc);
-        var intersection = cartesianCross(normal, arc);
-        cartesianNormalizeInPlace(intersection);
-        var phiArc = (antimeridian ^ delta >= 0 ? -1 : 1) * asin(intersection[2]);
-        if (phi > phiArc || phi === phiArc && (arc[0] || arc[1])) {
-          winding += antimeridian ^ delta >= 0 ? 1 : -1;
-        }
-      }
-    }
-  }
-
-  // First, determine whether the South pole is inside or outside:
-  //
-  // It is inside if:
-  // * the polygon winds around it in a clockwise direction.
-  // * the polygon does not (cumulatively) wind around it, but has a negative
-  //   (counter-clockwise) area.
-  //
-  // Second, count the (signed) number of times a segment crosses a lambda
-  // from the point to the South pole.  If it is zero, then the point is the
-  // same side as the South pole.
-
-  return (angle < -epsilon$2 || angle < epsilon$2 && sum$1 < -epsilon$2) ^ (winding & 1);
-};
-
 var lengthSum = adder();
 var lambda0$2;
 var sinPhi0$1;
@@ -8483,402 +8943,6 @@ var index$1 = function(projection, context) {
   return path.projection(projection).context(context);
 };
 
-var clip = function(pointVisible, clipLine, interpolate, start) {
-  return function(rotate, sink) {
-    var line = clipLine(sink),
-        rotatedStart = rotate.invert(start[0], start[1]),
-        ringBuffer = clipBuffer(),
-        ringSink = clipLine(ringBuffer),
-        polygonStarted = false,
-        polygon,
-        segments,
-        ring;
-
-    var clip = {
-      point: point,
-      lineStart: lineStart,
-      lineEnd: lineEnd,
-      polygonStart: function() {
-        clip.point = pointRing;
-        clip.lineStart = ringStart;
-        clip.lineEnd = ringEnd;
-        segments = [];
-        polygon = [];
-      },
-      polygonEnd: function() {
-        clip.point = point;
-        clip.lineStart = lineStart;
-        clip.lineEnd = lineEnd;
-        segments = merge(segments);
-        var startInside = polygonContains(polygon, rotatedStart);
-        if (segments.length) {
-          if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
-          clipPolygon(segments, compareIntersection, startInside, interpolate, sink);
-        } else if (startInside) {
-          if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
-          sink.lineStart();
-          interpolate(null, null, 1, sink);
-          sink.lineEnd();
-        }
-        if (polygonStarted) sink.polygonEnd(), polygonStarted = false;
-        segments = polygon = null;
-      },
-      sphere: function() {
-        sink.polygonStart();
-        sink.lineStart();
-        interpolate(null, null, 1, sink);
-        sink.lineEnd();
-        sink.polygonEnd();
-      }
-    };
-
-    function point(lambda, phi) {
-      var point = rotate(lambda, phi);
-      if (pointVisible(lambda = point[0], phi = point[1])) sink.point(lambda, phi);
-    }
-
-    function pointLine(lambda, phi) {
-      var point = rotate(lambda, phi);
-      line.point(point[0], point[1]);
-    }
-
-    function lineStart() {
-      clip.point = pointLine;
-      line.lineStart();
-    }
-
-    function lineEnd() {
-      clip.point = point;
-      line.lineEnd();
-    }
-
-    function pointRing(lambda, phi) {
-      ring.push([lambda, phi]);
-      var point = rotate(lambda, phi);
-      ringSink.point(point[0], point[1]);
-    }
-
-    function ringStart() {
-      ringSink.lineStart();
-      ring = [];
-    }
-
-    function ringEnd() {
-      pointRing(ring[0][0], ring[0][1]);
-      ringSink.lineEnd();
-
-      var clean = ringSink.clean(),
-          ringSegments = ringBuffer.result(),
-          i, n = ringSegments.length, m,
-          segment,
-          point;
-
-      ring.pop();
-      polygon.push(ring);
-      ring = null;
-
-      if (!n) return;
-
-      // No intersections.
-      if (clean & 1) {
-        segment = ringSegments[0];
-        if ((m = segment.length - 1) > 0) {
-          if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
-          sink.lineStart();
-          for (i = 0; i < m; ++i) sink.point((point = segment[i])[0], point[1]);
-          sink.lineEnd();
-        }
-        return;
-      }
-
-      // Rejoin connected segments.
-      // TODO reuse ringBuffer.rejoin()?
-      if (n > 1 && clean & 2) ringSegments.push(ringSegments.pop().concat(ringSegments.shift()));
-
-      segments.push(ringSegments.filter(validSegment));
-    }
-
-    return clip;
-  };
-};
-
-function validSegment(segment) {
-  return segment.length > 1;
-}
-
-// Intersections are sorted along the clip edge. For both antimeridian cutting
-// and circle clipping, the same comparison is used.
-function compareIntersection(a, b) {
-  return ((a = a.x)[0] < 0 ? a[1] - halfPi$2 - epsilon$2 : halfPi$2 - a[1])
-       - ((b = b.x)[0] < 0 ? b[1] - halfPi$2 - epsilon$2 : halfPi$2 - b[1]);
-}
-
-var clipAntimeridian = clip(
-  function() { return true; },
-  clipAntimeridianLine,
-  clipAntimeridianInterpolate,
-  [-pi$3, -halfPi$2]
-);
-
-// Takes a line and cuts into visible segments. Return values: 0 - there were
-// intersections or the line was empty; 1 - no intersections; 2 - there were
-// intersections, and the first and last segments should be rejoined.
-function clipAntimeridianLine(stream) {
-  var lambda0 = NaN,
-      phi0 = NaN,
-      sign0 = NaN,
-      clean; // no intersections
-
-  return {
-    lineStart: function() {
-      stream.lineStart();
-      clean = 1;
-    },
-    point: function(lambda1, phi1) {
-      var sign1 = lambda1 > 0 ? pi$3 : -pi$3,
-          delta = abs(lambda1 - lambda0);
-      if (abs(delta - pi$3) < epsilon$2) { // line crosses a pole
-        stream.point(lambda0, phi0 = (phi0 + phi1) / 2 > 0 ? halfPi$2 : -halfPi$2);
-        stream.point(sign0, phi0);
-        stream.lineEnd();
-        stream.lineStart();
-        stream.point(sign1, phi0);
-        stream.point(lambda1, phi0);
-        clean = 0;
-      } else if (sign0 !== sign1 && delta >= pi$3) { // line crosses antimeridian
-        if (abs(lambda0 - sign0) < epsilon$2) lambda0 -= sign0 * epsilon$2; // handle degeneracies
-        if (abs(lambda1 - sign1) < epsilon$2) lambda1 -= sign1 * epsilon$2;
-        phi0 = clipAntimeridianIntersect(lambda0, phi0, lambda1, phi1);
-        stream.point(sign0, phi0);
-        stream.lineEnd();
-        stream.lineStart();
-        stream.point(sign1, phi0);
-        clean = 0;
-      }
-      stream.point(lambda0 = lambda1, phi0 = phi1);
-      sign0 = sign1;
-    },
-    lineEnd: function() {
-      stream.lineEnd();
-      lambda0 = phi0 = NaN;
-    },
-    clean: function() {
-      return 2 - clean; // if intersections, rejoin first and last segments
-    }
-  };
-}
-
-function clipAntimeridianIntersect(lambda0, phi0, lambda1, phi1) {
-  var cosPhi0,
-      cosPhi1,
-      sinLambda0Lambda1 = sin$1(lambda0 - lambda1);
-  return abs(sinLambda0Lambda1) > epsilon$2
-      ? atan((sin$1(phi0) * (cosPhi1 = cos$1(phi1)) * sin$1(lambda1)
-          - sin$1(phi1) * (cosPhi0 = cos$1(phi0)) * sin$1(lambda0))
-          / (cosPhi0 * cosPhi1 * sinLambda0Lambda1))
-      : (phi0 + phi1) / 2;
-}
-
-function clipAntimeridianInterpolate(from, to, direction, stream) {
-  var phi;
-  if (from == null) {
-    phi = direction * halfPi$2;
-    stream.point(-pi$3, phi);
-    stream.point(0, phi);
-    stream.point(pi$3, phi);
-    stream.point(pi$3, 0);
-    stream.point(pi$3, -phi);
-    stream.point(0, -phi);
-    stream.point(-pi$3, -phi);
-    stream.point(-pi$3, 0);
-    stream.point(-pi$3, phi);
-  } else if (abs(from[0] - to[0]) > epsilon$2) {
-    var lambda = from[0] < to[0] ? pi$3 : -pi$3;
-    phi = direction * lambda / 2;
-    stream.point(-lambda, phi);
-    stream.point(0, phi);
-    stream.point(lambda, phi);
-  } else {
-    stream.point(to[0], to[1]);
-  }
-}
-
-var clipCircle = function(radius, delta) {
-  var cr = cos$1(radius),
-      smallRadius = cr > 0,
-      notHemisphere = abs(cr) > epsilon$2; // TODO optimise for this common case
-
-  function interpolate(from, to, direction, stream) {
-    circleStream(stream, radius, delta, direction, from, to);
-  }
-
-  function visible(lambda, phi) {
-    return cos$1(lambda) * cos$1(phi) > cr;
-  }
-
-  // Takes a line and cuts into visible segments. Return values used for polygon
-  // clipping: 0 - there were intersections or the line was empty; 1 - no
-  // intersections 2 - there were intersections, and the first and last segments
-  // should be rejoined.
-  function clipLine(stream) {
-    var point0, // previous point
-        c0, // code for previous point
-        v0, // visibility of previous point
-        v00, // visibility of first point
-        clean; // no intersections
-    return {
-      lineStart: function() {
-        v00 = v0 = false;
-        clean = 1;
-      },
-      point: function(lambda, phi) {
-        var point1 = [lambda, phi],
-            point2,
-            v = visible(lambda, phi),
-            c = smallRadius
-              ? v ? 0 : code(lambda, phi)
-              : v ? code(lambda + (lambda < 0 ? pi$3 : -pi$3), phi) : 0;
-        if (!point0 && (v00 = v0 = v)) stream.lineStart();
-        // Handle degeneracies.
-        // TODO ignore if not clipping polygons.
-        if (v !== v0) {
-          point2 = intersect(point0, point1);
-          if (!point2 || pointEqual(point0, point2) || pointEqual(point1, point2)) {
-            point1[0] += epsilon$2;
-            point1[1] += epsilon$2;
-            v = visible(point1[0], point1[1]);
-          }
-        }
-        if (v !== v0) {
-          clean = 0;
-          if (v) {
-            // outside going in
-            stream.lineStart();
-            point2 = intersect(point1, point0);
-            stream.point(point2[0], point2[1]);
-          } else {
-            // inside going out
-            point2 = intersect(point0, point1);
-            stream.point(point2[0], point2[1]);
-            stream.lineEnd();
-          }
-          point0 = point2;
-        } else if (notHemisphere && point0 && smallRadius ^ v) {
-          var t;
-          // If the codes for two points are different, or are both zero,
-          // and there this segment intersects with the small circle.
-          if (!(c & c0) && (t = intersect(point1, point0, true))) {
-            clean = 0;
-            if (smallRadius) {
-              stream.lineStart();
-              stream.point(t[0][0], t[0][1]);
-              stream.point(t[1][0], t[1][1]);
-              stream.lineEnd();
-            } else {
-              stream.point(t[1][0], t[1][1]);
-              stream.lineEnd();
-              stream.lineStart();
-              stream.point(t[0][0], t[0][1]);
-            }
-          }
-        }
-        if (v && (!point0 || !pointEqual(point0, point1))) {
-          stream.point(point1[0], point1[1]);
-        }
-        point0 = point1, v0 = v, c0 = c;
-      },
-      lineEnd: function() {
-        if (v0) stream.lineEnd();
-        point0 = null;
-      },
-      // Rejoin first and last segments if there were intersections and the first
-      // and last points were visible.
-      clean: function() {
-        return clean | ((v00 && v0) << 1);
-      }
-    };
-  }
-
-  // Intersects the great circle between a and b with the clip circle.
-  function intersect(a, b, two) {
-    var pa = cartesian(a),
-        pb = cartesian(b);
-
-    // We have two planes, n1.p = d1 and n2.p = d2.
-    // Find intersection line p(t) = c1 n1 + c2 n2 + t (n1 ⨯ n2).
-    var n1 = [1, 0, 0], // normal
-        n2 = cartesianCross(pa, pb),
-        n2n2 = cartesianDot(n2, n2),
-        n1n2 = n2[0], // cartesianDot(n1, n2),
-        determinant = n2n2 - n1n2 * n1n2;
-
-    // Two polar points.
-    if (!determinant) return !two && a;
-
-    var c1 =  cr * n2n2 / determinant,
-        c2 = -cr * n1n2 / determinant,
-        n1xn2 = cartesianCross(n1, n2),
-        A = cartesianScale(n1, c1),
-        B = cartesianScale(n2, c2);
-    cartesianAddInPlace(A, B);
-
-    // Solve |p(t)|^2 = 1.
-    var u = n1xn2,
-        w = cartesianDot(A, u),
-        uu = cartesianDot(u, u),
-        t2 = w * w - uu * (cartesianDot(A, A) - 1);
-
-    if (t2 < 0) return;
-
-    var t = sqrt(t2),
-        q = cartesianScale(u, (-w - t) / uu);
-    cartesianAddInPlace(q, A);
-    q = spherical(q);
-
-    if (!two) return q;
-
-    // Two intersection points.
-    var lambda0 = a[0],
-        lambda1 = b[0],
-        phi0 = a[1],
-        phi1 = b[1],
-        z;
-
-    if (lambda1 < lambda0) z = lambda0, lambda0 = lambda1, lambda1 = z;
-
-    var delta = lambda1 - lambda0,
-        polar = abs(delta - pi$3) < epsilon$2,
-        meridian = polar || delta < epsilon$2;
-
-    if (!polar && phi1 < phi0) z = phi0, phi0 = phi1, phi1 = z;
-
-    // Check that the first point is between a and b.
-    if (meridian
-        ? polar
-          ? phi0 + phi1 > 0 ^ q[1] < (abs(q[0] - lambda0) < epsilon$2 ? phi0 : phi1)
-          : phi0 <= q[1] && q[1] <= phi1
-        : delta > pi$3 ^ (lambda0 <= q[0] && q[0] <= lambda1)) {
-      var q1 = cartesianScale(u, (-w + t) / uu);
-      cartesianAddInPlace(q1, A);
-      return [q, spherical(q1)];
-    }
-  }
-
-  // Generates a 4-bit vector representing the location of a point relative to
-  // the small circle's bounding box.
-  function code(lambda, phi) {
-    var r = smallRadius ? radius : pi$3 - radius,
-        code = 0;
-    if (lambda < -r) code |= 1; // left
-    else if (lambda > r) code |= 2; // right
-    if (phi < -r) code |= 4; // below
-    else if (phi > r) code |= 8; // above
-    return code;
-  }
-
-  return clip(visible, clipLine, interpolate, smallRadius ? [0, -radius] : [-pi$3, radius - pi$3]);
-};
-
 var transform = function(methods) {
   return {
     stream: transformer(methods)
@@ -9040,6 +9104,15 @@ var transformRadians = transformer({
   }
 });
 
+function transformRotate(rotate) {
+  return transformer({
+    point: function(x, y) {
+      var r = rotate(x, y);
+      return this.stream.point(r[0], r[1]);
+    }
+  });
+}
+
 function projection(project) {
   return projectionMutator(function() { return project; })();
 }
@@ -9071,15 +9144,23 @@ function projectionMutator(projectAt) {
   }
 
   projection.stream = function(stream) {
-    return cache && cacheStream === stream ? cache : cache = transformRadians(preclip(rotate, projectResample(postclip(cacheStream = stream))));
+    return cache && cacheStream === stream ? cache : cache = transformRadians(transformRotate(rotate)(preclip(projectResample(postclip(cacheStream = stream)))));
+  };
+
+  projection.preclip = function(_) {
+    return arguments.length ? (preclip = _, theta = undefined, reset()) : preclip;
+  };
+
+  projection.postclip = function(_) {
+    return arguments.length ? (postclip = _, x0 = y0 = x1 = y1 = null, reset()) : postclip;
   };
 
   projection.clipAngle = function(_) {
-    return arguments.length ? (preclip = +_ ? clipCircle(theta = _ * radians, 6 * radians) : (theta = null, clipAntimeridian), reset()) : theta * degrees$1;
+    return arguments.length ? (preclip = +_ ? clipCircle(theta = _ * radians) : (theta = null, clipAntimeridian), reset()) : theta * degrees$1;
   };
 
   projection.clipExtent = function(_) {
-    return arguments.length ? (postclip = _ == null ? (x0 = y0 = x1 = y1 = null, identity$4) : clipExtent(x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1]), reset()) : x0 == null ? null : [[x0, y0], [x1, y1]];
+    return arguments.length ? (postclip = _ == null ? (x0 = y0 = x1 = y1 = null, identity$4) : clipRectangle(x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1]), reset()) : x0 == null ? null : [[x0, y0], [x1, y1]];
   };
 
   projection.scale = function(_) {
@@ -9485,8 +9566,9 @@ function scaleTranslate(kx, ky, tx, ty) {
 }
 
 var identity$5 = function() {
-  var k = 1, tx = 0, ty = 0, sx = 1, sy = 1, transform = identity$4, // scale, translate and reflect
-      x0 = null, y0, x1, y1, clip = identity$4, // clip extent
+  var k = 1, tx = 0, ty = 0, sx = 1, sy = 1, transform$$1 = identity$4, // scale, translate and reflect
+      x0 = null, y0, x1, y1, // clip extent
+      postclip = identity$4,
       cache,
       cacheStream,
       projection;
@@ -9498,22 +9580,25 @@ var identity$5 = function() {
 
   return projection = {
     stream: function(stream) {
-      return cache && cacheStream === stream ? cache : cache = transform(clip(cacheStream = stream));
+      return cache && cacheStream === stream ? cache : cache = transform$$1(postclip(cacheStream = stream));
+    },
+    postclip: function(_) {
+      return arguments.length ? (postclip = _, x0 = y0 = x1 = y1 = null, reset()) : postclip;
     },
     clipExtent: function(_) {
-      return arguments.length ? (clip = _ == null ? (x0 = y0 = x1 = y1 = null, identity$4) : clipExtent(x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1]), reset()) : x0 == null ? null : [[x0, y0], [x1, y1]];
+      return arguments.length ? (postclip = _ == null ? (x0 = y0 = x1 = y1 = null, identity$4) : clipRectangle(x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1]), reset()) : x0 == null ? null : [[x0, y0], [x1, y1]];
     },
     scale: function(_) {
-      return arguments.length ? (transform = scaleTranslate((k = +_) * sx, k * sy, tx, ty), reset()) : k;
+      return arguments.length ? (transform$$1 = scaleTranslate((k = +_) * sx, k * sy, tx, ty), reset()) : k;
     },
     translate: function(_) {
-      return arguments.length ? (transform = scaleTranslate(k * sx, k * sy, tx = +_[0], ty = +_[1]), reset()) : [tx, ty];
+      return arguments.length ? (transform$$1 = scaleTranslate(k * sx, k * sy, tx = +_[0], ty = +_[1]), reset()) : [tx, ty];
     },
     reflectX: function(_) {
-      return arguments.length ? (transform = scaleTranslate(k * (sx = _ ? -1 : 1), k * sy, tx, ty), reset()) : sx < 0;
+      return arguments.length ? (transform$$1 = scaleTranslate(k * (sx = _ ? -1 : 1), k * sy, tx, ty), reset()) : sx < 0;
     },
     reflectY: function(_) {
-      return arguments.length ? (transform = scaleTranslate(k * sx, k * (sy = _ ? -1 : 1), tx, ty), reset()) : sy < 0;
+      return arguments.length ? (transform$$1 = scaleTranslate(k * sx, k * (sy = _ ? -1 : 1), tx, ty), reset()) : sy < 0;
     },
     fitExtent: function(extent, object) {
       return fitExtent(projection, extent, object);
@@ -9524,6 +9609,32 @@ var identity$5 = function() {
   };
 };
 
+function naturalEarth1Raw(lambda, phi) {
+  var phi2 = phi * phi, phi4 = phi2 * phi2;
+  return [
+    lambda * (0.8707 - 0.131979 * phi2 + phi4 * (-0.013791 + phi4 * (0.003971 * phi2 - 0.001529 * phi4))),
+    phi * (1.007226 + phi2 * (0.015085 + phi4 * (-0.044475 + 0.028874 * phi2 - 0.005916 * phi4)))
+  ];
+}
+
+naturalEarth1Raw.invert = function(x, y) {
+  var phi = y, i = 25, delta;
+  do {
+    var phi2 = phi * phi, phi4 = phi2 * phi2;
+    phi -= delta = (phi * (1.007226 + phi2 * (0.015085 + phi4 * (-0.044475 + 0.028874 * phi2 - 0.005916 * phi4))) - y) /
+        (1.007226 + phi2 * (0.015085 * 3 + phi4 * (-0.044475 * 7 + 0.028874 * 9 * phi2 - 0.005916 * 11 * phi4)));
+  } while (abs(delta) > epsilon$2 && --i > 0);
+  return [
+    x / (0.8707 + (phi2 = phi * phi) * (-0.131979 + phi2 * (-0.013791 + phi2 * phi2 * phi2 * (0.003971 - 0.001529 * phi2)))),
+    phi
+  ];
+};
+
+var naturalEarth1 = function() {
+  return projection(naturalEarth1Raw)
+      .scale(175.295);
+};
+
 function orthographicRaw(x, y) {
   return [cos$1(y) * sin$1(x), sin$1(y)];
 }
@@ -9866,83 +9977,92 @@ Node.prototype = hierarchy.prototype = {
   copy: node_copy
 };
 
-function Node$2(value) {
-  this._ = value;
-  this.next = null;
-}
+var slice$3 = Array.prototype.slice;
 
-var shuffle$1 = function(array) {
-  var i,
-      n = (array = array.slice()).length,
-      head = null,
-      node = head;
+function shuffle$1(array) {
+  var m = array.length,
+      t,
+      i;
 
-  while (n) {
-    var next = new Node$2(array[n - 1]);
-    if (node) node = node.next = next;
-    else node = head = next;
-    array[i] = array[--n];
+  while (m) {
+    i = Math.random() * m-- | 0;
+    t = array[m];
+    array[m] = array[i];
+    array[i] = t;
   }
 
-  return {
-    head: head,
-    tail: node
-  };
-};
+  return array;
+}
 
 var enclose = function(circles) {
-  return encloseN(shuffle$1(circles), []);
+  var i = 0, n = (circles = shuffle$1(slice$3.call(circles))).length, B = [], p, e;
+
+  while (i < n) {
+    p = circles[i];
+    if (e && enclosesWeak(e, p)) ++i;
+    else e = encloseBasis(B = extendBasis(B, p)), i = 0;
+  }
+
+  return e;
 };
 
-function encloses(a, b) {
-  var dx = b.x - a.x,
-      dy = b.y - a.y,
-      dr = a.r - b.r;
-  return dr * dr + 1e-6 > dx * dx + dy * dy;
-}
+function extendBasis(B, p) {
+  var i, j;
 
-// Returns the smallest circle that contains circles L and intersects circles B.
-function encloseN(L, B) {
-  var circle,
-      l0 = null,
-      l1 = L.head,
-      l2,
-      p1;
+  if (enclosesWeakAll(p, B)) return [p];
 
-  switch (B.length) {
-    case 1: circle = enclose1(B[0]); break;
-    case 2: circle = enclose2(B[0], B[1]); break;
-    case 3: circle = enclose3(B[0], B[1], B[2]); break;
-  }
-
-  while (l1) {
-    p1 = l1._, l2 = l1.next;
-    if (!circle || !encloses(circle, p1)) {
-
-      // Temporarily truncate L before l1.
-      if (l0) L.tail = l0, l0.next = null;
-      else L.head = L.tail = null;
-
-      B.push(p1);
-      circle = encloseN(L, B); // Note: reorders L!
-      B.pop();
-
-      // Move l1 to the front of L and reconnect the truncated list L.
-      if (L.head) l1.next = L.head, L.head = l1;
-      else l1.next = null, L.head = L.tail = l1;
-      l0 = L.tail, l0.next = l2;
-
-    } else {
-      l0 = l1;
+  // If we get here then B must have at least one element.
+  for (i = 0; i < B.length; ++i) {
+    if (enclosesNot(p, B[i])
+        && enclosesWeakAll(encloseBasis2(B[i], p), B)) {
+      return [B[i], p];
     }
-    l1 = l2;
   }
 
-  L.tail = l0;
-  return circle;
+  // If we get here then B must have at least two elements.
+  for (i = 0; i < B.length - 1; ++i) {
+    for (j = i + 1; j < B.length; ++j) {
+      if (enclosesNot(encloseBasis2(B[i], B[j]), p)
+          && enclosesNot(encloseBasis2(B[i], p), B[j])
+          && enclosesNot(encloseBasis2(B[j], p), B[i])
+          && enclosesWeakAll(encloseBasis3(B[i], B[j], p), B)) {
+        return [B[i], B[j], p];
+      }
+    }
+  }
+
+  // If we get here then something is very wrong.
+  throw new Error;
 }
 
-function enclose1(a) {
+function enclosesNot(a, b) {
+  var dr = a.r - b.r, dx = b.x - a.x, dy = b.y - a.y;
+  return dr < 0 || dr * dr < dx * dx + dy * dy;
+}
+
+function enclosesWeak(a, b) {
+  var dr = a.r - b.r + 1e-6, dx = b.x - a.x, dy = b.y - a.y;
+  return dr > 0 && dr * dr > dx * dx + dy * dy;
+}
+
+function enclosesWeakAll(a, B) {
+  for (var i = 0; i < B.length; ++i) {
+    if (!enclosesWeak(a, B[i])) {
+      return false;
+    }
+  }
+  return true;
+}
+
+function encloseBasis(B) {
+  switch (B.length) {
+    case 1: return encloseBasis1(B[0]);
+    case 2: return encloseBasis2(B[0], B[1]);
+    case 3: return encloseBasis3(B[0], B[1], B[2]);
+  }
+}
+
+function encloseBasis1(a) {
   return {
     x: a.x,
     y: a.y,
@@ -9950,7 +10070,7 @@ function enclose1(a) {
   };
 }
 
-function enclose2(a, b) {
+function encloseBasis2(a, b) {
   var x1 = a.x, y1 = a.y, r1 = a.r,
       x2 = b.x, y2 = b.y, r2 = b.r,
       x21 = x2 - x1, y21 = y2 - y1, r21 = r2 - r1,
@@ -9962,30 +10082,31 @@ function enclose2(a, b) {
   };
 }
 
-function enclose3(a, b, c) {
+function encloseBasis3(a, b, c) {
   var x1 = a.x, y1 = a.y, r1 = a.r,
       x2 = b.x, y2 = b.y, r2 = b.r,
       x3 = c.x, y3 = c.y, r3 = c.r,
-      a2 = 2 * (x1 - x2),
-      b2 = 2 * (y1 - y2),
-      c2 = 2 * (r2 - r1),
-      d2 = x1 * x1 + y1 * y1 - r1 * r1 - x2 * x2 - y2 * y2 + r2 * r2,
-      a3 = 2 * (x1 - x3),
-      b3 = 2 * (y1 - y3),
-      c3 = 2 * (r3 - r1),
-      d3 = x1 * x1 + y1 * y1 - r1 * r1 - x3 * x3 - y3 * y3 + r3 * r3,
+      a2 = x1 - x2,
+      a3 = x1 - x3,
+      b2 = y1 - y2,
+      b3 = y1 - y3,
+      c2 = r2 - r1,
+      c3 = r3 - r1,
+      d1 = x1 * x1 + y1 * y1 - r1 * r1,
+      d2 = d1 - x2 * x2 - y2 * y2 + r2 * r2,
+      d3 = d1 - x3 * x3 - y3 * y3 + r3 * r3,
       ab = a3 * b2 - a2 * b3,
-      xa = (b2 * d3 - b3 * d2) / ab - x1,
+      xa = (b2 * d3 - b3 * d2) / (ab * 2) - x1,
       xb = (b3 * c2 - b2 * c3) / ab,
-      ya = (a3 * d2 - a2 * d3) / ab - y1,
+      ya = (a3 * d2 - a2 * d3) / (ab * 2) - y1,
       yb = (a2 * c3 - a3 * c2) / ab,
       A = xb * xb + yb * yb - 1,
-      B = 2 * (xa * xb + ya * yb + r1),
+      B = 2 * (r1 + xa * xb + ya * yb),
       C = xa * xa + ya * ya - r1 * r1,
-      r = (-B - Math.sqrt(B * B - 4 * A * C)) / (2 * A);
+      r = -(A ? (B + Math.sqrt(B * B - 4 * A * C)) / (2 * A) : C / B);
   return {
-    x: xa + xb * r + x1,
-    y: ya + yb * r + y1,
+    x: x1 + xa + xb * r,
+    y: y1 + ya + yb * r,
     r: r
   };
 }
@@ -10016,12 +10137,12 @@ function intersects(a, b) {
   return dr * dr - 1e-6 > dx * dx + dy * dy;
 }
 
-function distance2(node, x, y) {
+function score(node) {
   var a = node._,
       b = node.next._,
       ab = a.r + b.r,
-      dx = (a.x * b.r + b.x * a.r) / ab - x,
-      dy = (a.y * b.r + b.y * a.r) / ab - y;
+      dx = (a.x * b.r + b.x * a.r) / ab,
+      dy = (a.y * b.r + b.y * a.r) / ab;
   return dx * dx + dy * dy;
 }
 
@@ -10034,7 +10155,7 @@ function Node$1(circle) {
 function packEnclose(circles) {
   if (!(n = circles.length)) return 0;
 
-  var a, b, c, n;
+  var a, b, c, n, aa, ca, i, j, k, sj, sk;
 
   // Place the first circle.
   a = circles[0], a.x = 0, a.y = 0;
@@ -10047,15 +10168,6 @@ function packEnclose(circles) {
   // Place the third circle.
   place(b, a, c = circles[2]);
 
-  // Initialize the weighted centroid.
-  var aa = a.r * a.r,
-      ba = b.r * b.r,
-      ca = c.r * c.r,
-      oa = aa + ba + ca,
-      ox = aa * a.x + ba * b.x + ca * c.x,
-      oy = aa * a.y + ba * b.y + ca * c.y,
-      cx, cy, i, j, k, sj, sk;
-
   // Initialize the front-chain using the first three circles a, b and c.
   a = new Node$1(a), b = new Node$1(b), c = new Node$1(c);
   a.next = c.previous = b;
@@ -10089,15 +10201,10 @@ function packEnclose(circles) {
     // Success! Insert the new circle c between a and b.
     c.previous = a, c.next = b, a.next = b.previous = b = c;
 
-    // Update the weighted centroid.
-    oa += ca = c._.r * c._.r;
-    ox += ca * c._.x;
-    oy += ca * c._.y;
-
     // Compute the new closest circle pair to the centroid.
-    aa = distance2(a, cx = ox / oa, cy = oy / oa);
+    aa = score(a);
     while ((c = c.next) !== b) {
-      if ((ca = distance2(c, cx, cy)) < aa) {
+      if ((ca = score(c)) < aa) {
         a = c, aa = ca;
       }
     }
@@ -10654,7 +10761,7 @@ function squarifyRatio(ratio, parent, x0, y0, x1, y1) {
   return rows;
 }
 
-var squarify = ((function custom(ratio) {
+var squarify = (function custom(ratio) {
 
   function squarify(parent, x0, y0, x1, y1) {
     squarifyRatio(ratio, parent, x0, y0, x1, y1);
@@ -10665,7 +10772,7 @@ var squarify = ((function custom(ratio) {
   };
 
   return squarify;
-}))(phi);
+})(phi);
 
 var index$3 = function() {
   var tile = squarify,
@@ -10808,7 +10915,7 @@ var sliceDice = function(parent, x0, y0, x1, y1) {
   (parent.depth & 1 ? treemapSlice : treemapDice)(parent, x0, y0, x1, y1);
 };
 
-var resquarify = ((function custom(ratio) {
+var resquarify = (function custom(ratio) {
 
   function resquarify(parent, x0, y0, x1, y1) {
     if ((rows = parent._squarify) && (rows.ratio === ratio)) {
@@ -10839,7 +10946,7 @@ var resquarify = ((function custom(ratio) {
   };
 
   return resquarify;
-}))(phi);
+})(phi);
 
 var area$1 = function(polygon) {
   var i = -1,
@@ -10975,7 +11082,7 @@ var length$2 = function(polygon) {
   return perimeter;
 };
 
-var slice$3 = [].slice;
+var slice$4 = [].slice;
 
 var noabort = {};
 
@@ -10997,7 +11104,7 @@ Queue.prototype = queue.prototype = {
     if (typeof callback !== "function") throw new Error("invalid callback");
     if (this._call) throw new Error("defer after await");
     if (this._error != null) return this;
-    var t = slice$3.call(arguments, 1);
+    var t = slice$4.call(arguments, 1);
     t.push(callback);
     ++this._waiting, this._tasks.push(t);
     poke$1(this);
@@ -11101,7 +11208,7 @@ var defaultSource$1 = function() {
   return Math.random();
 };
 
-var uniform = ((function sourceRandomUniform(source) {
+var uniform = (function sourceRandomUniform(source) {
   function randomUniform(min, max) {
     min = min == null ? 0 : +min;
     max = max == null ? 1 : +max;
@@ -11115,9 +11222,9 @@ var uniform = ((function sourceRandomUniform(source) {
   randomUniform.source = sourceRandomUniform;
 
   return randomUniform;
-}))(defaultSource$1);
+})(defaultSource$1);
 
-var normal = ((function sourceRandomNormal(source) {
+var normal = (function sourceRandomNormal(source) {
   function randomNormal(mu, sigma) {
     var x, r;
     mu = mu == null ? 0 : +mu;
@@ -11142,9 +11249,9 @@ var normal = ((function sourceRandomNormal(source) {
   randomNormal.source = sourceRandomNormal;
 
   return randomNormal;
-}))(defaultSource$1);
+})(defaultSource$1);
 
-var logNormal = ((function sourceRandomLogNormal(source) {
+var logNormal = (function sourceRandomLogNormal(source) {
   function randomLogNormal() {
     var randomNormal = normal.source(source).apply(this, arguments);
     return function() {
@@ -11155,9 +11262,9 @@ var logNormal = ((function sourceRandomLogNormal(source) {
   randomLogNormal.source = sourceRandomLogNormal;
 
   return randomLogNormal;
-}))(defaultSource$1);
+})(defaultSource$1);
 
-var irwinHall = ((function sourceRandomIrwinHall(source) {
+var irwinHall = (function sourceRandomIrwinHall(source) {
   function randomIrwinHall(n) {
     return function() {
       for (var sum = 0, i = 0; i < n; ++i) sum += source();
@@ -11168,9 +11275,9 @@ var irwinHall = ((function sourceRandomIrwinHall(source) {
   randomIrwinHall.source = sourceRandomIrwinHall;
 
   return randomIrwinHall;
-}))(defaultSource$1);
+})(defaultSource$1);
 
-var bates = ((function sourceRandomBates(source) {
+var bates = (function sourceRandomBates(source) {
   function randomBates(n) {
     var randomIrwinHall = irwinHall.source(source)(n);
     return function() {
@@ -11181,9 +11288,9 @@ var bates = ((function sourceRandomBates(source) {
   randomBates.source = sourceRandomBates;
 
   return randomBates;
-}))(defaultSource$1);
+})(defaultSource$1);
 
-var exponential$1 = ((function sourceRandomExponential(source) {
+var exponential$1 = (function sourceRandomExponential(source) {
   function randomExponential(lambda) {
     return function() {
       return -Math.log(1 - source()) / lambda;
@@ -11193,7 +11300,7 @@ var exponential$1 = ((function sourceRandomExponential(source) {
   randomExponential.source = sourceRandomExponential;
 
   return randomExponential;
-}))(defaultSource$1);
+})(defaultSource$1);
 
 var request = function(url, callback) {
   var request,
@@ -11396,7 +11503,7 @@ var tsv$1 = dsv$1("text/tab-separated-values", tsvParse);
 var array$2 = Array.prototype;
 
 var map$3 = array$2.map;
-var slice$4 = array$2.slice;
+var slice$5 = array$2.slice;
 
 var implicit = {name: "implicit"};
 
@@ -11405,7 +11512,7 @@ function ordinal(range) {
       domain = [],
       unknown = implicit;
 
-  range = range == null ? [] : slice$4.call(range);
+  range = range == null ? [] : slice$5.call(range);
 
   function scale(d) {
     var key = d + "", i = index.get(key);
@@ -11425,7 +11532,7 @@ function ordinal(range) {
   };
 
   scale.range = function(_) {
-    return arguments.length ? (range = slice$4.call(_), scale) : range.slice();
+    return arguments.length ? (range = slice$5.call(_), scale) : range.slice();
   };
 
   scale.unknown = function(_) {
@@ -11547,7 +11654,7 @@ var constant$9 = function(x) {
   };
 };
 
-var number$1 = function(x) {
+var number$2 = function(x) {
   return +x;
 };
 
@@ -11573,15 +11680,15 @@ function reinterpolateClamp(reinterpolate) {
   };
 }
 
-function bimap(domain, range$$1, deinterpolate, reinterpolate) {
-  var d0 = domain[0], d1 = domain[1], r0 = range$$1[0], r1 = range$$1[1];
+function bimap(domain, range, deinterpolate, reinterpolate) {
+  var d0 = domain[0], d1 = domain[1], r0 = range[0], r1 = range[1];
   if (d1 < d0) d0 = deinterpolate(d1, d0), r0 = reinterpolate(r1, r0);
   else d0 = deinterpolate(d0, d1), r0 = reinterpolate(r0, r1);
   return function(x) { return r0(d0(x)); };
 }
 
-function polymap(domain, range$$1, deinterpolate, reinterpolate) {
-  var j = Math.min(domain.length, range$$1.length) - 1,
+function polymap(domain, range, deinterpolate, reinterpolate) {
+  var j = Math.min(domain.length, range.length) - 1,
       d = new Array(j),
       r = new Array(j),
       i = -1;
@@ -11589,12 +11696,12 @@ function polymap(domain, range$$1, deinterpolate, reinterpolate) {
   // Reverse descending domains.
   if (domain[j] < domain[0]) {
     domain = domain.slice().reverse();
-    range$$1 = range$$1.slice().reverse();
+    range = range.slice().reverse();
   }
 
   while (++i < j) {
     d[i] = deinterpolate(domain[i], domain[i + 1]);
-    r[i] = reinterpolate(range$$1[i], range$$1[i + 1]);
+    r[i] = reinterpolate(range[i], range[i + 1]);
   }
 
   return function(x) {
@@ -11615,7 +11722,7 @@ function copy(source, target) {
 // reinterpolate(a, b)(t) takes a parameter t in [0,1] and returns the corresponding domain value x in [a,b].
 function continuous(deinterpolate, reinterpolate) {
   var domain = unit,
-      range$$1 = unit,
+      range = unit,
       interpolate$$1 = interpolateValue,
       clamp = false,
       piecewise,
@@ -11623,29 +11730,29 @@ function continuous(deinterpolate, reinterpolate) {
       input;
 
   function rescale() {
-    piecewise = Math.min(domain.length, range$$1.length) > 2 ? polymap : bimap;
+    piecewise = Math.min(domain.length, range.length) > 2 ? polymap : bimap;
     output = input = null;
     return scale;
   }
 
   function scale(x) {
-    return (output || (output = piecewise(domain, range$$1, clamp ? deinterpolateClamp(deinterpolate) : deinterpolate, interpolate$$1)))(+x);
+    return (output || (output = piecewise(domain, range, clamp ? deinterpolateClamp(deinterpolate) : deinterpolate, interpolate$$1)))(+x);
   }
 
   scale.invert = function(y) {
-    return (input || (input = piecewise(range$$1, domain, deinterpolateLinear, clamp ? reinterpolateClamp(reinterpolate) : reinterpolate)))(+y);
+    return (input || (input = piecewise(range, domain, deinterpolateLinear, clamp ? reinterpolateClamp(reinterpolate) : reinterpolate)))(+y);
   };
 
   scale.domain = function(_) {
-    return arguments.length ? (domain = map$3.call(_, number$1), rescale()) : domain.slice();
+    return arguments.length ? (domain = map$3.call(_, number$2), rescale()) : domain.slice();
   };
 
   scale.range = function(_) {
-    return arguments.length ? (range$$1 = slice$4.call(_), rescale()) : range$$1.slice();
+    return arguments.length ? (range = slice$5.call(_), rescale()) : range.slice();
   };
 
   scale.rangeRound = function(_) {
-    return range$$1 = slice$4.call(_), interpolate$$1 = interpolateRound, rescale();
+    return range = slice$5.call(_), interpolate$$1 = interpolateRound, rescale();
   };
 
   scale.clamp = function(_) {
@@ -11763,7 +11870,7 @@ function identity$6() {
   scale.invert = scale;
 
   scale.domain = scale.range = function(_) {
-    return arguments.length ? (domain = map$3.call(_, number$1), scale) : domain.slice();
+    return arguments.length ? (domain = map$3.call(_, number$2), scale) : domain.slice();
   };
 
   scale.copy = function() {
@@ -11952,22 +12059,22 @@ function sqrt$1() {
 
 function quantile$$1() {
   var domain = [],
-      range$$1 = [],
+      range = [],
       thresholds = [];
 
   function rescale() {
-    var i = 0, n = Math.max(1, range$$1.length);
+    var i = 0, n = Math.max(1, range.length);
     thresholds = new Array(n - 1);
     while (++i < n) thresholds[i - 1] = threshold(domain, i / n);
     return scale;
   }
 
   function scale(x) {
-    if (!isNaN(x = +x)) return range$$1[bisectRight(thresholds, x)];
+    if (!isNaN(x = +x)) return range[bisectRight(thresholds, x)];
   }
 
   scale.invertExtent = function(y) {
-    var i = range$$1.indexOf(y);
+    var i = range.indexOf(y);
     return i < 0 ? [NaN, NaN] : [
       i > 0 ? thresholds[i - 1] : domain[0],
       i < thresholds.length ? thresholds[i] : domain[domain.length - 1]
@@ -11983,7 +12090,7 @@ function quantile$$1() {
   };
 
   scale.range = function(_) {
-    return arguments.length ? (range$$1 = slice$4.call(_), rescale()) : range$$1.slice();
+    return arguments.length ? (range = slice$5.call(_), rescale()) : range.slice();
   };
 
   scale.quantiles = function() {
@@ -11993,7 +12100,7 @@ function quantile$$1() {
   scale.copy = function() {
     return quantile$$1()
         .domain(domain)
-        .range(range$$1);
+        .range(range);
   };
 
   return scale;
@@ -12004,10 +12111,10 @@ function quantize$1() {
       x1 = 1,
       n = 1,
       domain = [0.5],
-      range$$1 = [0, 1];
+      range = [0, 1];
 
   function scale(x) {
-    if (x <= x) return range$$1[bisectRight(domain, x, 0, n)];
+    if (x <= x) return range[bisectRight(domain, x, 0, n)];
   }
 
   function rescale() {
@@ -12022,11 +12129,11 @@ function quantize$1() {
   };
 
   scale.range = function(_) {
-    return arguments.length ? (n = (range$$1 = slice$4.call(_)).length - 1, rescale()) : range$$1.slice();
+    return arguments.length ? (n = (range = slice$5.call(_)).length - 1, rescale()) : range.slice();
   };
 
   scale.invertExtent = function(y) {
-    var i = range$$1.indexOf(y);
+    var i = range.indexOf(y);
     return i < 0 ? [NaN, NaN]
         : i < 1 ? [x0, domain[0]]
         : i >= n ? [domain[n - 1], x1]
@@ -12036,7 +12143,7 @@ function quantize$1() {
   scale.copy = function() {
     return quantize$1()
         .domain([x0, x1])
-        .range(range$$1);
+        .range(range);
   };
 
   return linearish(scale);
@@ -12044,30 +12151,30 @@ function quantize$1() {
 
 function threshold$1() {
   var domain = [0.5],
-      range$$1 = [0, 1],
+      range = [0, 1],
       n = 1;
 
   function scale(x) {
-    if (x <= x) return range$$1[bisectRight(domain, x, 0, n)];
+    if (x <= x) return range[bisectRight(domain, x, 0, n)];
   }
 
   scale.domain = function(_) {
-    return arguments.length ? (domain = slice$4.call(_), n = Math.min(domain.length, range$$1.length - 1), scale) : domain.slice();
+    return arguments.length ? (domain = slice$5.call(_), n = Math.min(domain.length, range.length - 1), scale) : domain.slice();
   };
 
   scale.range = function(_) {
-    return arguments.length ? (range$$1 = slice$4.call(_), n = Math.min(domain.length, range$$1.length - 1), scale) : range$$1.slice();
+    return arguments.length ? (range = slice$5.call(_), n = Math.min(domain.length, range.length - 1), scale) : range.slice();
   };
 
   scale.invertExtent = function(y) {
-    var i = range$$1.indexOf(y);
+    var i = range.indexOf(y);
     return [domain[i - 1], domain[i]];
   };
 
   scale.copy = function() {
     return threshold$1()
         .domain(domain)
-        .range(range$$1);
+        .range(range);
   };
 
   return scale;
@@ -12111,7 +12218,13 @@ function newInterval(floori, offseti, count, field) {
     return newInterval(function(date) {
       if (date >= date) while (floori(date), !test(date)) date.setTime(date - 1);
     }, function(date, step) {
-      if (date >= date) while (--step >= 0) while (offseti(date, 1), !test(date)) {} // eslint-disable-line no-empty
+      if (date >= date) {
+        if (step < 0) while (++step <= 0) {
+          while (offseti(date, -1), !test(date)) {} // eslint-disable-line no-empty
+        } else while (--step >= 0) {
+          while (offseti(date, +1), !test(date)) {} // eslint-disable-line no-empty
+        }
+      }
     });
   };
 
@@ -12907,7 +13020,7 @@ function formatLiteralPercent() {
   return "%";
 }
 
-var locale$2;
+var locale$1;
 
 
 
@@ -12925,12 +13038,12 @@ defaultLocale$1({
 });
 
 function defaultLocale$1(definition) {
-  locale$2 = formatLocale$1(definition);
-  exports.timeFormat = locale$2.format;
-  exports.timeParse = locale$2.parse;
-  exports.utcFormat = locale$2.utcFormat;
-  exports.utcParse = locale$2.utcParse;
-  return locale$2;
+  locale$1 = formatLocale$1(definition);
+  exports.timeFormat = locale$1.format;
+  exports.timeParse = locale$1.parse;
+  exports.utcFormat = locale$1.utcFormat;
+  exports.utcParse = locale$1.utcParse;
+  return locale$1;
 }
 
 var isoSpecifier = "%Y-%m-%dT%H:%M:%S.%LZ";
@@ -12964,7 +13077,7 @@ function date$1(t) {
   return new Date(t);
 }
 
-function number$2(t) {
+function number$3(t) {
   return t instanceof Date ? +t : +new Date(+t);
 }
 
@@ -13043,7 +13156,7 @@ function calendar(year$$1, month$$1, week, day$$1, hour$$1, minute$$1, second$$1
   };
 
   scale.domain = function(_) {
-    return arguments.length ? domain(map$3.call(_, number$2)) : domain().map(date$1);
+    return arguments.length ? domain(map$3.call(_, number$3)) : domain().map(date$1);
   };
 
   scale.ticks = function(interval, step) {
@@ -13755,7 +13868,7 @@ function curveRadial(curve) {
   return radial;
 }
 
-function radialLine(l) {
+function lineRadial(l) {
   var c = l.curve;
 
   l.angle = l.x, delete l.x;
@@ -13768,11 +13881,11 @@ function radialLine(l) {
   return l;
 }
 
-var radialLine$1 = function() {
-  return radialLine(line().curve(curveRadialLinear));
+var lineRadial$1 = function() {
+  return lineRadial(line().curve(curveRadialLinear));
 };
 
-var radialArea = function() {
+var areaRadial = function() {
   var a = area$2().curve(curveRadialLinear),
       c = a.curve,
       x0 = a.lineX0,
@@ -13786,10 +13899,10 @@ var radialArea = function() {
   a.radius = a.y, delete a.y;
   a.innerRadius = a.y0, delete a.y0;
   a.outerRadius = a.y1, delete a.y1;
-  a.lineStartAngle = function() { return radialLine(x0()); }, delete a.lineX0;
-  a.lineEndAngle = function() { return radialLine(x1()); }, delete a.lineX1;
-  a.lineInnerRadius = function() { return radialLine(y0()); }, delete a.lineY0;
-  a.lineOuterRadius = function() { return radialLine(y1()); }, delete a.lineY1;
+  a.lineStartAngle = function() { return lineRadial(x0()); }, delete a.lineX0;
+  a.lineEndAngle = function() { return lineRadial(x1()); }, delete a.lineX1;
+  a.lineInnerRadius = function() { return lineRadial(y0()); }, delete a.lineY0;
+  a.lineOuterRadius = function() { return lineRadial(y1()); }, delete a.lineY1;
 
   a.curve = function(_) {
     return arguments.length ? c(curveRadial(_)) : c()._curve;
@@ -13798,12 +13911,12 @@ var radialArea = function() {
   return a;
 };
 
-var slice$5 = Array.prototype.slice;
-
-var radialPoint = function(x, y) {
+var pointRadial = function(x, y) {
   return [(y = +y) * Math.cos(x -= Math.PI / 2), y * Math.sin(x)];
 };
 
+var slice$6 = Array.prototype.slice;
+
 function linkSource(d) {
   return d.source;
 }
@@ -13820,7 +13933,7 @@ function link$2(curve) {
       context = null;
 
   function link() {
-    var buffer, argv = slice$5.call(arguments), s = source.apply(this, argv), t = target.apply(this, argv);
+    var buffer, argv = slice$6.call(arguments), s = source.apply(this, argv), t = target.apply(this, argv);
     if (!context) context = buffer = path();
     curve(context, +x$$1.apply(this, (argv[0] = s, argv)), +y$$1.apply(this, argv), +x$$1.apply(this, (argv[0] = t, argv)), +y$$1.apply(this, argv));
     if (buffer) return context = null, buffer + "" || null;
@@ -13860,10 +13973,10 @@ function curveVertical(context, x0, y0, x1, y1) {
 }
 
 function curveRadial$1(context, x0, y0, x1, y1) {
-  var p0 = radialPoint(x0, y0),
-      p1 = radialPoint(x0, y0 = (y0 + y1) / 2),
-      p2 = radialPoint(x1, y0),
-      p3 = radialPoint(x1, y1);
+  var p0 = pointRadial(x0, y0),
+      p1 = pointRadial(x0, y0 = (y0 + y1) / 2),
+      p2 = pointRadial(x1, y0),
+      p3 = pointRadial(x1, y1);
   context.moveTo(p0[0], p0[1]);
   context.bezierCurveTo(p1[0], p1[1], p2[0], p2[1], p3[0], p3[1]);
 }
@@ -14216,7 +14329,7 @@ Bundle.prototype = {
   }
 };
 
-var bundle = ((function custom(beta) {
+var bundle = (function custom(beta) {
 
   function bundle(context) {
     return beta === 1 ? new Basis(context) : new Bundle(context, beta);
@@ -14227,7 +14340,7 @@ var bundle = ((function custom(beta) {
   };
 
   return bundle;
-}))(0.85);
+})(0.85);
 
 function point$3(that, x, y) {
   that._context.bezierCurveTo(
@@ -14278,7 +14391,7 @@ Cardinal.prototype = {
   }
 };
 
-var cardinal = ((function custom(tension) {
+var cardinal = (function custom(tension) {
 
   function cardinal(context) {
     return new Cardinal(context, tension);
@@ -14289,7 +14402,7 @@ var cardinal = ((function custom(tension) {
   };
 
   return cardinal;
-}))(0);
+})(0);
 
 function CardinalClosed(context, tension) {
   this._context = context;
@@ -14337,18 +14450,18 @@ CardinalClosed.prototype = {
   }
 };
 
-var cardinalClosed = ((function custom(tension) {
+var cardinalClosed = (function custom(tension) {
 
-  function cardinal(context) {
+  function cardinal$$1(context) {
     return new CardinalClosed(context, tension);
   }
 
-  cardinal.tension = function(tension) {
+  cardinal$$1.tension = function(tension) {
     return custom(+tension);
   };
 
-  return cardinal;
-}))(0);
+  return cardinal$$1;
+})(0);
 
 function CardinalOpen(context, tension) {
   this._context = context;
@@ -14385,18 +14498,18 @@ CardinalOpen.prototype = {
   }
 };
 
-var cardinalOpen = ((function custom(tension) {
+var cardinalOpen = (function custom(tension) {
 
-  function cardinal(context) {
+  function cardinal$$1(context) {
     return new CardinalOpen(context, tension);
   }
 
-  cardinal.tension = function(tension) {
+  cardinal$$1.tension = function(tension) {
     return custom(+tension);
   };
 
-  return cardinal;
-}))(0);
+  return cardinal$$1;
+})(0);
 
 function point$4(that, x, y) {
   var x1 = that._x1,
@@ -14471,7 +14584,7 @@ CatmullRom.prototype = {
   }
 };
 
-var catmullRom = ((function custom(alpha) {
+var catmullRom = (function custom(alpha) {
 
   function catmullRom(context) {
     return alpha ? new CatmullRom(context, alpha) : new Cardinal(context, 0);
@@ -14482,7 +14595,7 @@ var catmullRom = ((function custom(alpha) {
   };
 
   return catmullRom;
-}))(0.5);
+})(0.5);
 
 function CatmullRomClosed(context, alpha) {
   this._context = context;
@@ -14542,18 +14655,18 @@ CatmullRomClosed.prototype = {
   }
 };
 
-var catmullRomClosed = ((function custom(alpha) {
+var catmullRomClosed = (function custom(alpha) {
 
-  function catmullRom(context) {
+  function catmullRom$$1(context) {
     return alpha ? new CatmullRomClosed(context, alpha) : new CardinalClosed(context, 0);
   }
 
-  catmullRom.alpha = function(alpha) {
+  catmullRom$$1.alpha = function(alpha) {
     return custom(+alpha);
   };
 
-  return catmullRom;
-}))(0.5);
+  return catmullRom$$1;
+})(0.5);
 
 function CatmullRomOpen(context, alpha) {
   this._context = context;
@@ -14602,18 +14715,18 @@ CatmullRomOpen.prototype = {
   }
 };
 
-var catmullRomOpen = ((function custom(alpha) {
+var catmullRomOpen = (function custom(alpha) {
 
-  function catmullRom(context) {
+  function catmullRom$$1(context) {
     return alpha ? new CatmullRomOpen(context, alpha) : new CardinalOpen(context, 0);
   }
 
-  catmullRom.alpha = function(alpha) {
+  catmullRom$$1.alpha = function(alpha) {
     return custom(+alpha);
   };
 
-  return catmullRom;
-}))(0.5);
+  return catmullRom$$1;
+})(0.5);
 
 function LinearClosed(context) {
   this._context = context;
@@ -14915,7 +15028,7 @@ var stack = function() {
   }
 
   stack.keys = function(_) {
-    return arguments.length ? (keys = typeof _ === "function" ? _ : constant$10(slice$5.call(_)), stack) : keys;
+    return arguments.length ? (keys = typeof _ === "function" ? _ : constant$10(slice$6.call(_)), stack) : keys;
   };
 
   stack.value = function(_) {
@@ -14923,7 +15036,7 @@ var stack = function() {
   };
 
   stack.order = function(_) {
-    return arguments.length ? (order = _ == null ? none$2 : typeof _ === "function" ? _ : constant$10(slice$5.call(_)), stack) : order;
+    return arguments.length ? (order = _ == null ? none$2 : typeof _ === "function" ? _ : constant$10(slice$6.call(_)), stack) : order;
   };
 
   stack.offset = function(_) {
@@ -16114,9 +16227,19 @@ function defaultTransform() {
   return this.__zoom || identity$8;
 }
 
+function defaultWheelDelta() {
+  return -exports.event.deltaY * (exports.event.deltaMode ? 120 : 1) / 500;
+}
+
+function defaultTouchable$1() {
+  return "ontouchstart" in this;
+}
+
 var zoom = function() {
   var filter = defaultFilter$2,
       extent = defaultExtent$1,
+      wheelDelta = defaultWheelDelta,
+      touchable = defaultTouchable$1,
       k0 = 0,
       k1 = Infinity,
       x0 = -k1,
@@ -16124,7 +16247,7 @@ var zoom = function() {
       y0 = x0,
       y1 = x1,
       duration = 250,
-      interpolate$$1 = interpolateZoom,
+      interpolate = interpolateZoom,
       gestures = [],
       listeners = dispatch("start", "zoom", "end"),
       touchstarting,
@@ -16133,43 +16256,45 @@ var zoom = function() {
       wheelDelay = 150,
       clickDistance2 = 0;
 
-  function zoom(selection$$1) {
-    selection$$1
+  function zoom(selection) {
+    selection
+        .property("__zoom", defaultTransform)
         .on("wheel.zoom", wheeled)
         .on("mousedown.zoom", mousedowned)
         .on("dblclick.zoom", dblclicked)
+      .filter(touchable)
         .on("touchstart.zoom", touchstarted)
         .on("touchmove.zoom", touchmoved)
         .on("touchend.zoom touchcancel.zoom", touchended)
-        .style("-webkit-tap-highlight-color", "rgba(0,0,0,0)")
-        .property("__zoom", defaultTransform);
+        .style("touch-action", "none")
+        .style("-webkit-tap-highlight-color", "rgba(0,0,0,0)");
   }
 
-  zoom.transform = function(collection, transform) {
-    var selection$$1 = collection.selection ? collection.selection() : collection;
-    selection$$1.property("__zoom", defaultTransform);
-    if (collection !== selection$$1) {
-      schedule(collection, transform);
+  zoom.transform = function(collection, transform$$1) {
+    var selection = collection.selection ? collection.selection() : collection;
+    selection.property("__zoom", defaultTransform);
+    if (collection !== selection) {
+      schedule(collection, transform$$1);
     } else {
-      selection$$1.interrupt().each(function() {
+      selection.interrupt().each(function() {
         gesture(this, arguments)
             .start()
-            .zoom(null, typeof transform === "function" ? transform.apply(this, arguments) : transform)
+            .zoom(null, typeof transform$$1 === "function" ? transform$$1.apply(this, arguments) : transform$$1)
             .end();
       });
     }
   };
 
-  zoom.scaleBy = function(selection$$1, k) {
-    zoom.scaleTo(selection$$1, function() {
+  zoom.scaleBy = function(selection, k) {
+    zoom.scaleTo(selection, function() {
       var k0 = this.__zoom.k,
           k1 = typeof k === "function" ? k.apply(this, arguments) : k;
       return k0 * k1;
     });
   };
 
-  zoom.scaleTo = function(selection$$1, k) {
-    zoom.transform(selection$$1, function() {
+  zoom.scaleTo = function(selection, k) {
+    zoom.transform(selection, function() {
       var e = extent.apply(this, arguments),
           t0 = this.__zoom,
           p0 = centroid(e),
@@ -16179,8 +16304,8 @@ var zoom = function() {
     });
   };
 
-  zoom.translateBy = function(selection$$1, x, y) {
-    zoom.transform(selection$$1, function() {
+  zoom.translateBy = function(selection, x, y) {
+    zoom.transform(selection, function() {
       return constrain(this.__zoom.translate(
         typeof x === "function" ? x.apply(this, arguments) : x,
         typeof y === "function" ? y.apply(this, arguments) : y
@@ -16188,22 +16313,34 @@ var zoom = function() {
     });
   };
 
-  function scale(transform, k) {
+  zoom.translateTo = function(selection, x, y) {
+    zoom.transform(selection, function() {
+      var e = extent.apply(this, arguments),
+          t = this.__zoom,
+          p = centroid(e);
+      return constrain(identity$8.translate(p[0], p[1]).scale(t.k).translate(
+        typeof x === "function" ? -x.apply(this, arguments) : -x,
+        typeof y === "function" ? -y.apply(this, arguments) : -y
+      ), e);
+    });
+  };
+
+  function scale(transform$$1, k) {
     k = Math.max(k0, Math.min(k1, k));
-    return k === transform.k ? transform : new Transform(k, transform.x, transform.y);
+    return k === transform$$1.k ? transform$$1 : new Transform(k, transform$$1.x, transform$$1.y);
   }
 
-  function translate(transform, p0, p1) {
-    var x = p0[0] - p1[0] * transform.k, y = p0[1] - p1[1] * transform.k;
-    return x === transform.x && y === transform.y ? transform : new Transform(transform.k, x, y);
+  function translate(transform$$1, p0, p1) {
+    var x = p0[0] - p1[0] * transform$$1.k, y = p0[1] - p1[1] * transform$$1.k;
+    return x === transform$$1.x && y === transform$$1.y ? transform$$1 : new Transform(transform$$1.k, x, y);
   }
 
-  function constrain(transform, extent) {
-    var dx0 = transform.invertX(extent[0][0]) - x0,
-        dx1 = transform.invertX(extent[1][0]) - x1,
-        dy0 = transform.invertY(extent[0][1]) - y0,
-        dy1 = transform.invertY(extent[1][1]) - y1;
-    return transform.translate(
+  function constrain(transform$$1, extent) {
+    var dx0 = transform$$1.invertX(extent[0][0]) - x0,
+        dx1 = transform$$1.invertX(extent[1][0]) - x1,
+        dy0 = transform$$1.invertY(extent[0][1]) - y0,
+        dy1 = transform$$1.invertY(extent[1][1]) - y1;
+    return transform$$1.translate(
       dx1 > dx0 ? (dx0 + dx1) / 2 : Math.min(0, dx0) || Math.max(0, dx1),
       dy1 > dy0 ? (dy0 + dy1) / 2 : Math.min(0, dy0) || Math.max(0, dy1)
     );
@@ -16213,8 +16350,8 @@ var zoom = function() {
     return [(+extent[0][0] + +extent[1][0]) / 2, (+extent[0][1] + +extent[1][1]) / 2];
   }
 
-  function schedule(transition$$1, transform, center) {
-    transition$$1
+  function schedule(transition, transform$$1, center) {
+    transition
         .on("start.zoom", function() { gesture(this, arguments).start(); })
         .on("interrupt.zoom end.zoom", function() { gesture(this, arguments).end(); })
         .tween("zoom", function() {
@@ -16225,8 +16362,8 @@ var zoom = function() {
               p = center || centroid(e),
               w = Math.max(e[1][0] - e[0][0], e[1][1] - e[0][1]),
               a = that.__zoom,
-              b = typeof transform === "function" ? transform.apply(that, args) : transform,
-              i = interpolate$$1(a.invert(p).concat(w / a.k), b.invert(p).concat(w / b.k));
+              b = typeof transform$$1 === "function" ? transform$$1.apply(that, args) : transform$$1,
+              i = interpolate(a.invert(p).concat(w / a.k), b.invert(p).concat(w / b.k));
           return function(t) {
             if (t === 1) t = b; // Avoid rounding error on end.
             else { var l = i(t), k = w / l[2]; t = new Transform(k, p[0] - l[0] * k, p[1] - l[1] * k); }
@@ -16260,11 +16397,11 @@ var zoom = function() {
       }
       return this;
     },
-    zoom: function(key, transform) {
-      if (this.mouse && key !== "mouse") this.mouse[1] = transform.invert(this.mouse[0]);
-      if (this.touch0 && key !== "touch") this.touch0[1] = transform.invert(this.touch0[0]);
-      if (this.touch1 && key !== "touch") this.touch1[1] = transform.invert(this.touch1[0]);
-      this.that.__zoom = transform;
+    zoom: function(key, transform$$1) {
+      if (this.mouse && key !== "mouse") this.mouse[1] = transform$$1.invert(this.mouse[0]);
+      if (this.touch0 && key !== "touch") this.touch0[1] = transform$$1.invert(this.touch0[0]);
+      if (this.touch1 && key !== "touch") this.touch1[1] = transform$$1.invert(this.touch1[0]);
+      this.that.__zoom = transform$$1;
       this.emit("zoom");
       return this;
     },
@@ -16285,7 +16422,7 @@ var zoom = function() {
     if (!filter.apply(this, arguments)) return;
     var g = gesture(this, arguments),
         t = this.__zoom,
-        k = Math.max(k0, Math.min(k1, t.k * Math.pow(2, -exports.event.deltaY * (exports.event.deltaMode ? 120 : 1) / 500))),
+        k = Math.max(k0, Math.min(k1, t.k * Math.pow(2, wheelDelta.apply(this, arguments)))),
         p = mouse(this);
 
     // If the mouse is in the same location as before, reuse it.
@@ -16364,13 +16501,13 @@ var zoom = function() {
   function touchstarted() {
     if (!filter.apply(this, arguments)) return;
     var g = gesture(this, arguments),
-        touches$$1 = exports.event.changedTouches,
+        touches = exports.event.changedTouches,
         started,
-        n = touches$$1.length, i, t, p;
+        n = touches.length, i, t, p;
 
     nopropagation$2();
     for (i = 0; i < n; ++i) {
-      t = touches$$1[i], p = touch(this, touches$$1, t.identifier);
+      t = touches[i], p = touch(this, touches, t.identifier);
       p = [p, this.__zoom.invert(p), t.identifier];
       if (!g.touch0) g.touch0 = p, started = true;
       else if (!g.touch1) g.touch1 = p;
@@ -16396,13 +16533,13 @@ var zoom = function() {
 
   function touchmoved() {
     var g = gesture(this, arguments),
-        touches$$1 = exports.event.changedTouches,
-        n = touches$$1.length, i, t, p, l;
+        touches = exports.event.changedTouches,
+        n = touches.length, i, t, p, l;
 
     noevent$2();
     if (touchstarting) touchstarting = clearTimeout(touchstarting);
     for (i = 0; i < n; ++i) {
-      t = touches$$1[i], p = touch(this, touches$$1, t.identifier);
+      t = touches[i], p = touch(this, touches, t.identifier);
       if (g.touch0 && g.touch0[2] === t.identifier) g.touch0[0] = p;
       else if (g.touch1 && g.touch1[2] === t.identifier) g.touch1[0] = p;
     }
@@ -16423,14 +16560,14 @@ var zoom = function() {
 
   function touchended() {
     var g = gesture(this, arguments),
-        touches$$1 = exports.event.changedTouches,
-        n = touches$$1.length, i, t;
+        touches = exports.event.changedTouches,
+        n = touches.length, i, t;
 
     nopropagation$2();
     if (touchending) clearTimeout(touchending);
     touchending = setTimeout(function() { touchending = null; }, touchDelay);
     for (i = 0; i < n; ++i) {
-      t = touches$$1[i];
+      t = touches[i];
       if (g.touch0 && g.touch0[2] === t.identifier) delete g.touch0;
       else if (g.touch1 && g.touch1[2] === t.identifier) delete g.touch1;
     }
@@ -16439,10 +16576,18 @@ var zoom = function() {
     else g.end();
   }
 
+  zoom.wheelDelta = function(_) {
+    return arguments.length ? (wheelDelta = typeof _ === "function" ? _ : constant$12(+_), zoom) : wheelDelta;
+  };
+
   zoom.filter = function(_) {
     return arguments.length ? (filter = typeof _ === "function" ? _ : constant$12(!!_), zoom) : filter;
   };
 
+  zoom.touchable = function(_) {
+    return arguments.length ? (touchable = typeof _ === "function" ? _ : constant$12(!!_), zoom) : touchable;
+  };
+
   zoom.extent = function(_) {
     return arguments.length ? (extent = typeof _ === "function" ? _ : constant$12([[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]]), zoom) : extent;
   };
@@ -16460,7 +16605,7 @@ var zoom = function() {
   };
 
   zoom.interpolate = function(_) {
-    return arguments.length ? (interpolate$$1 = _, zoom) : interpolate$$1;
+    return arguments.length ? (interpolate = _, zoom) : interpolate;
   };
 
   zoom.on = function() {
@@ -16471,7 +16616,7 @@ var zoom = function() {
   zoom.clickDistance = function(_) {
     return arguments.length ? (clickDistance2 = (_ = +_) * _, zoom) : Math.sqrt(clickDistance2);
   };
-    
+
   return zoom;
 };
 
@@ -16583,6 +16728,7 @@ exports.forceCenter = center$1;
 exports.forceCollide = collide;
 exports.forceLink = link;
 exports.forceManyBody = manyBody;
+exports.forceRadial = radial;
 exports.forceSimulation = simulation;
 exports.forceX = x$2;
 exports.forceY = y$2;
@@ -16596,7 +16742,10 @@ exports.geoArea = area;
 exports.geoBounds = bounds;
 exports.geoCentroid = centroid;
 exports.geoCircle = circle;
+exports.geoClipAntimeridian = clipAntimeridian;
+exports.geoClipCircle = clipCircle;
 exports.geoClipExtent = extent$1;
+exports.geoClipRectangle = clipRectangle;
 exports.geoContains = contains;
 exports.geoDistance = distance;
 exports.geoGraticule = graticule;
@@ -16625,6 +16774,8 @@ exports.geoProjection = projection;
 exports.geoProjectionMutator = projectionMutator;
 exports.geoMercator = mercator;
 exports.geoMercatorRaw = mercatorRaw;
+exports.geoNaturalEarth1 = naturalEarth1;
+exports.geoNaturalEarth1Raw = naturalEarth1Raw;
 exports.geoOrthographic = orthographic;
 exports.geoOrthographicRaw = orthographicRaw;
 exports.geoStereographic = stereographic;
@@ -16740,8 +16891,11 @@ exports.arc = arc;
 exports.area = area$2;
 exports.line = line;
 exports.pie = pie;
-exports.radialArea = radialArea;
-exports.radialLine = radialLine$1;
+exports.areaRadial = areaRadial;
+exports.radialArea = areaRadial;
+exports.lineRadial = lineRadial$1;
+exports.radialLine = lineRadial$1;
+exports.pointRadial = pointRadial;
 exports.linkHorizontal = linkHorizontal;
 exports.linkVertical = linkVertical;
 exports.linkRadial = linkRadial;
diff --git a/examples/js/lib/d3.v4.min.js b/examples/js/lib/d3.v4.min.js
index 6a78c32..97ecbd7 100644
--- a/examples/js/lib/d3.v4.min.js
+++ b/examples/js/lib/d3.v4.min.js
@@ -1,8 +1,2 @@
-// https://d3js.org Version 4.3.0. Copyright 2016 Mike Bostock.
-(function(t,n){"object"==typeof exports&&"undefined"!=typeof module?n(exports):"function"==typeof define&&define.amd?define(["exports"],n):n(t.d3=t.d3||{})})(this,function(t){"use strict";function n(t){return function(n,e){return Ms(t(n),e)}}function e(t,n,e){var r=Math.abs(n-t)/Math.max(0,e),i=Math.pow(10,Math.floor(Math.log(r)/Math.LN10)),o=r/i;return o>=Fs?i*=10:o>=Is?i*=5:o>=Ys&&(i*=2),n<t?-i:i}function r(t){return t.length}function i(){}function o(t,n){var e=new i;if(t instanceof i)t.each(function(t,n){e.set(n,t)});else if(Array.isArray(t)){var r,o=-1,u=t.length;if(null==n)for(;++o<u;)e.set(o,t[o]);else for(;++o<u;)e.set(n(r=t[o],o,t),r)}else if(t)for(var a in t)e.set(a,t[a]);return e}function u(){return{}}function a(t,n,e){t[n]=e}function c(){return o()}function s(t,n,e){t.set(n,e)}function f(){}function l(t,n){var e=new f;if(t instanceof f)t.each(function(t){e.add(t)});else if(t){var r=-1,i=t.length;if(null==n)for(;++r<i;)e.add(t[r]);else for(;++r<i;)e.add(n(t[r],r,t))}return 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3:this.point(this._x3,this._y3),this.point(this._x4,this._y4),this.point(this._x5,this._y5)}},point:function(t,n){if(t=+t,n=+n,this._point){var e=this._x2-t,r=this._y2-n;this._l23_a=Math.sqrt(this._l23_2a=Math.pow(e*e+r*r,this._alpha))}switch(this._point){case 0:this._point=1,this._x3=t,this._y3=n;break;case 1:this._point=2,this._context.moveTo(this._x4=t,this._y4=n);break;case 2:this._point=3,this._x5=t,this._y5=n;break;default:ac(this,t,n)}this._l01_a=this._l12_a,this._l12_a=this._l23_a,this._l01_2a=this._l12_2a,this._l12_2a=this._l23_2a,this._x0=this._x1,this._x1=this._x2,this._x2=t,this._y0=this._y1,this._y1=this._y2,this._y2=n}};var rm=function t(n){function e(t){return n?new sc(t,n):new oc(t,0)}return e.alpha=function(n){return 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\ No newline at end of file