Update d3 JS resources to latest version

This fixes an issue I discovered in attribute transition values in IE.

Signed-off-by: Dan McGee <dan@archlinux.org>

4 files changed, 251 insertions, 138 deletions

diff --git a/media/d3.js b/media/d3.js
index 9b77bec..23edb6b 100644
--- a/media/d3.js
+++ b/media/d3.js
@@ -10,7 +10,7 @@ try {
     d3_style_setProperty.call(this, name, value + "", priority);
   };
 }
-d3 = {version: "2.3.0"}; // semver
+d3 = {version: "2.4.3"}; // semver
 var d3_array = d3_arraySlice; // conversion for NodeLists
 
 function d3_arrayCopy(pseudoarray) {
@@ -59,6 +59,24 @@ d3.ascending = function(a, b) {
 d3.descending = function(a, b) {
   return b < a ? -1 : b > a ? 1 : b >= a ? 0 : NaN;
 };
+d3.mean = function(array, f) {
+  var n = array.length,
+      a,
+      m = 0,
+      i = -1,
+      j = 0;
+  if (arguments.length === 1) {
+    while (++i < n) if (d3_number(a = array[i])) m += (a - m) / ++j;
+  } else {
+    while (++i < n) if (d3_number(a = f.call(array, array[i], i))) m += (a - m) / ++j;
+  }
+  return j ? m : undefined;
+};
+d3.median = function(array, f) {
+  if (arguments.length > 1) array = array.map(f);
+  array = array.filter(d3_number);
+  return array.length ? d3.quantile(array.sort(d3.ascending), .5) : undefined;
+};
 d3.min = function(array, f) {
   var i = -1,
       n = array.length,
@@ -87,6 +105,9 @@ d3.max = function(array, f) {
   }
   return a;
 };
+function d3_number(x) {
+  return x != null && !isNaN(x);
+}
 d3.sum = function(array, f) {
   var s = 0,
       n = array.length,
@@ -472,10 +493,11 @@ d3.format = function(specifier) {
       comma = match[7],
       precision = match[8],
       type = match[9],
-      percentage = false,
+      scale = 1,
+      suffix = "",
       integer = false;
 
-  if (precision) precision = precision.substring(1);
+  if (precision) precision = +precision.substring(1);
 
   if (zfill) {
     fill = "0"; // TODO align = "=";
@@ -484,22 +506,36 @@ d3.format = function(specifier) {
 
   switch (type) {
     case "n": comma = true; type = "g"; break;
-    case "%": percentage = true; type = "f"; break;
-    case "p": percentage = true; type = "r"; break;
-    case "d": integer = true; precision = "0"; break;
+    case "%": scale = 100; suffix = "%"; type = "f"; break;
+    case "p": scale = 100; suffix = "%"; type = "r"; break;
+    case "d": integer = true; precision = 0; break;
+    case "s": scale = -1; type = "r"; break;
   }
 
+  // If no precision is specified for r, fallback to general notation.
+  if (type == "r" && !precision) type = "g";
+
   type = d3_format_types[type] || d3_format_typeDefault;
 
   return function(value) {
-    var number = percentage ? value * 100 : +value,
-        negative = (number < 0) && (number = -number) ? "\u2212" : sign;
 
     // Return the empty string for floats formatted as ints.
-    if (integer && (number % 1)) return "";
+    if (integer && (value % 1)) return "";
 
-    // Convert the input value to the desired precision.
-    value = type(number, precision);
+    // Convert negative to positive, and record the sign prefix.
+    var negative = (value < 0) && (value = -value) ? "\u2212" : sign;
+
+    // Apply the scale, computing it from the value's exponent for si format.
+    if (scale < 0) {
+      var prefix = d3.formatPrefix(value, precision);
+      value *= prefix.scale;
+      suffix = prefix.symbol;
+    } else {
+      value *= scale;
+    }
+
+    // Convert to the desired precision.
+    value = type(value, precision);
 
     // If the fill character is 0, the sign and group is applied after the fill.
     if (zfill) {
@@ -516,9 +552,8 @@ d3.format = function(specifier) {
       var length = value.length;
       if (length < width) value = new Array(width - length + 1).join(fill) + value;
     }
-    if (percentage) value += "%";
 
-    return value;
+    return value + suffix;
   };
 };
 
@@ -529,12 +564,13 @@ var d3_format_types = {
   g: function(x, p) { return x.toPrecision(p); },
   e: function(x, p) { return x.toExponential(p); },
   f: function(x, p) { return x.toFixed(p); },
-  r: function(x, p) {
-    var n = x ? 1 + Math.floor(1e-15 + Math.log(x) / Math.LN10) : 1;
-    return d3.round(x, p - n).toFixed(Math.max(0, Math.min(20, p - n)));
-  }
+  r: function(x, p) { return d3.round(x, p = d3_format_precision(x, p)).toFixed(Math.max(0, Math.min(20, p))); }
 };
 
+function d3_format_precision(x, p) {
+  return p - (x ? 1 + Math.floor(Math.log(x + Math.pow(10, 1 + Math.floor(Math.log(x) / Math.LN10) - p)) / Math.LN10) : 1);
+}
+
 function d3_format_typeDefault(x) {
   return x + "";
 }
@@ -547,6 +583,26 @@ function d3_format_group(value) {
   while (i > 0) t.push(value.substring(i -= 3, i + 3));
   return t.reverse().join(",") + f;
 }
+var d3_formatPrefixes = ["y","z","a","f","p","n","μ","m","","k","M","G","T","P","E","Z","Y"].map(d3_formatPrefix);
+
+d3.formatPrefix = function(value, precision) {
+  var i = 0;
+  if (value) {
+    if (value < 0) value *= -1;
+    if (precision) value = d3.round(value, d3_format_precision(value, precision));
+    i = 1 + Math.floor(1e-12 + Math.log(value) / Math.LN10);
+    i = Math.max(-24, Math.min(24, Math.floor((i <= 0 ? i + 1 : i - 1) / 3) * 3));
+  }
+  return d3_formatPrefixes[8 + i / 3];
+};
+
+function d3_formatPrefix(d, i) {
+  return {
+    scale: Math.pow(10, (8 - i) * 3),
+    symbol: d
+  };
+}
+
 /*
  * TERMS OF USE - EASING EQUATIONS
  *
@@ -780,10 +836,10 @@ d3.interpolateRgb = function(a, b) {
       bg = b.g - ag,
       bb = b.b - ab;
   return function(t) {
-    return "rgb(" + Math.round(ar + br * t)
-        + "," + Math.round(ag + bg * t)
-        + "," + Math.round(ab + bb * t)
-        + ")";
+    return "#"
+        + d3_rgb_hex(Math.round(ar + br * t))
+        + d3_rgb_hex(Math.round(ag + bg * t))
+        + d3_rgb_hex(Math.round(ab + bb * t));
   };
 };
 
@@ -867,7 +923,8 @@ function d3_uninterpolateClamp(a, b) {
 }
 d3.rgb = function(r, g, b) {
   return arguments.length === 1
-      ? d3_rgb_parse("" + r, d3_rgb, d3_hsl_rgb)
+      ? (r instanceof d3_Rgb ? d3_rgb(r.r, r.g, r.b)
+      : d3_rgb_parse("" + r, d3_rgb, d3_hsl_rgb))
       : d3_rgb(~~r, ~~g, ~~b);
 };
 
@@ -892,17 +949,17 @@ d3_Rgb.prototype.brighter = function(k) {
   if (g && g < i) g = i;
   if (b && b < i) b = i;
   return d3_rgb(
-    Math.min(255, Math.floor(r / k)),
-    Math.min(255, Math.floor(g / k)),
-    Math.min(255, Math.floor(b / k)));
+      Math.min(255, Math.floor(r / k)),
+      Math.min(255, Math.floor(g / k)),
+      Math.min(255, Math.floor(b / k)));
 };
 
 d3_Rgb.prototype.darker = function(k) {
   k = Math.pow(0.7, arguments.length ? k : 1);
   return d3_rgb(
-    Math.max(0, Math.floor(k * this.r)),
-    Math.max(0, Math.floor(k * this.g)),
-    Math.max(0, Math.floor(k * this.b)));
+      Math.floor(k * this.r),
+      Math.floor(k * this.g),
+      Math.floor(k * this.b));
 };
 
 d3_Rgb.prototype.hsl = function() {
@@ -914,7 +971,9 @@ d3_Rgb.prototype.toString = function() {
 };
 
 function d3_rgb_hex(v) {
-  return v < 0x10 ? "0" + v.toString(16) : v.toString(16);
+  return v < 0x10
+      ? "0" + Math.max(0, v).toString(16)
+      : Math.min(255, v).toString(16);
 }
 
 function d3_rgb_parse(format, rgb, hsl) {
@@ -1151,7 +1210,8 @@ for (var d3_rgb_name in d3_rgb_names) {
 }
 d3.hsl = function(h, s, l) {
   return arguments.length === 1
-      ? d3_rgb_parse("" + h, d3_rgb_hsl, d3_hsl)
+      ? (h instanceof d3_Hsl ? d3_hsl(h.h, h.s, h.l)
+      : d3_rgb_parse("" + h, d3_rgb_hsl, d3_hsl))
       : d3_hsl(+h, +s, +l);
 };
 
@@ -1180,7 +1240,7 @@ d3_Hsl.prototype.rgb = function() {
 };
 
 d3_Hsl.prototype.toString = function() {
-  return "hsl(" + this.h + "," + this.s * 100 + "%," + this.l * 100 + "%)";
+  return this.rgb().toString();
 };
 
 function d3_hsl_rgb(h, s, l) {
@@ -1331,6 +1391,21 @@ d3_selectionPrototype.attr = function(name, value) {
       : (name.local ? attrConstantNS : attrConstant)));
 };
 d3_selectionPrototype.classed = function(name, value) {
+  var names = name.split(d3_selection_classedWhitespace),
+      n = names.length,
+      i = -1;
+  if (arguments.length > 1) {
+    while (++i < n) d3_selection_classed.call(this, names[i], value);
+    return this;
+  } else {
+    while (++i < n) if (!d3_selection_classed.call(this, names[i])) return false;
+    return true;
+  }
+};
+
+var d3_selection_classedWhitespace = /\s+/g;
+
+function d3_selection_classed(name, value) {
   var re = new RegExp("(^|\\s+)" + d3.requote(name) + "(\\s+|$)", "g");
 
   // If no value is specified, return the first value.
@@ -1375,7 +1450,7 @@ d3_selectionPrototype.classed = function(name, value) {
       ? classedFunction : value
       ? classedAdd
       : classedRemove);
-};
+}
 d3_selectionPrototype.style = function(name, value, priority) {
   if (arguments.length < 3) priority = "";
 
@@ -1856,10 +1931,28 @@ function d3_transition(groups, id) {
   return groups;
 }
 
+var d3_transitionRemove = {};
+
+function d3_transitionNull(d, i, a) {
+  return a != "" && d3_transitionRemove;
+}
+
 function d3_transitionTween(b) {
-  return typeof b === "function"
-      ? function(d, i, a) { var v = b.call(this, d, i) + ""; return a != v && d3.interpolate(a, v); }
-      : (b = b + "", function(d, i, a) { return a != b && d3.interpolate(a, b); });
+
+  function transitionFunction(d, i, a) {
+    var v = b.call(this, d, i);
+    return v == null
+        ? a != "" && d3_transitionRemove
+        : a != v && d3.interpolate(a, v);
+  }
+
+  function transitionString(d, i, a) {
+    return a != b && d3.interpolate(a, b);
+  }
+
+  return typeof b === "function" ? transitionFunction
+      : b == null ? d3_transitionNull
+      : (b += "", transitionString);
 }
 
 var d3_transitionPrototype = [],
@@ -1899,6 +1992,7 @@ d3_transitionPrototype.select = function(selector) {
 d3_transitionPrototype.selectAll = function(selector) {
   var subgroups = [],
       subgroup,
+      subnodes,
       node;
 
   if (typeof selector !== "function") selector = d3_selection_selectorAll(selector);
@@ -1906,9 +2000,10 @@ d3_transitionPrototype.selectAll = function(selector) {
   for (var j = -1, m = this.length; ++j < m;) {
     for (var group = this[j], i = -1, n = group.length; ++i < n;) {
       if (node = group[i]) {
-        subgroups.push(subgroup = selector.call(node.node, node.node.__data__, i));
-        for (var k = -1, o = subgroup.length; ++k < o;) {
-          subgroup[k] = {node: subgroup[k], delay: node.delay, duration: node.duration};
+        subnodes = selector.call(node.node, node.node.__data__, i);
+        subgroups.push(subgroup = []);
+        for (var k = -1, o = subnodes.length; ++k < o;) {
+          subgroup.push({node: subnodes[k], delay: node.delay, duration: node.duration});
         }
       }
     }
@@ -1920,24 +2015,24 @@ d3_transitionPrototype.attr = function(name, value) {
   return this.attrTween(name, d3_transitionTween(value));
 };
 
-d3_transitionPrototype.attrTween = function(name, tween) {
-  name = d3.ns.qualify(name);
+d3_transitionPrototype.attrTween = function(nameNS, tween) {
+  var name = d3.ns.qualify(nameNS);
 
   function attrTween(d, i) {
     var f = tween.call(this, d, i, this.getAttribute(name));
-    return f && function(t) {
-      this.setAttribute(name, f(t));
-    };
+    return f === d3_transitionRemove
+        ? (this.removeAttribute(name), null)
+        : f && function(t) { this.setAttribute(name, f(t)); };
   }
 
   function attrTweenNS(d, i) {
     var f = tween.call(this, d, i, this.getAttributeNS(name.space, name.local));
-    return f && function(t) {
-      this.setAttributeNS(name.space, name.local, f(t));
-    };
+    return f === d3_transitionRemove
+        ? (this.removeAttributeNS(name.space, name.local), null)
+        : f && function(t) { this.setAttributeNS(name.space, name.local, f(t)); };
   }
 
-  return this.tween("attr." + name, name.local ? attrTweenNS : attrTween);
+  return this.tween("attr." + nameNS, name.local ? attrTweenNS : attrTween);
 };
 d3_transitionPrototype.style = function(name, value, priority) {
   if (arguments.length < 3) priority = "";
@@ -1948,9 +2043,9 @@ d3_transitionPrototype.styleTween = function(name, tween, priority) {
   if (arguments.length < 3) priority = "";
   return this.tween("style." + name, function(d, i) {
     var f = tween.call(this, d, i, window.getComputedStyle(this, null).getPropertyValue(name));
-    return f && function(t) {
-      this.style.setProperty(name, f(t), priority);
-    };
+    return f === d3_transitionRemove
+        ? (this.style.removeProperty(name), null)
+        : f && function(t) { this.style.setProperty(name, f(t), priority); };
   });
 };
 d3_transitionPrototype.text = function(value) {
@@ -2113,9 +2208,12 @@ function d3_scale_nice(domain, nice) {
     dx = x0; x0 = x1; x1 = dx;
   }
 
-  nice = nice(x1 - x0);
-  domain[i0] = nice.floor(x0);
-  domain[i1] = nice.ceil(x1);
+  if (dx = x1 - x0) {
+    nice = nice(dx);
+    domain[i0] = nice.floor(x0);
+    domain[i1] = nice.ceil(x1);
+  }
+
   return domain;
 }
 
@@ -3147,16 +3245,17 @@ function d3_svg_area(projection) {
       x1 = d3_svg_lineX,
       y0 = 0,
       y1 = d3_svg_lineY,
-      interpolate = "linear",
-      interpolator = d3_svg_lineInterpolators[interpolate],
+      interpolate,
+      i0,
+      i1,
       tension = .7;
 
   function area(d) {
     if (d.length < 1) return null;
     var points0 = d3_svg_linePoints(this, d, x0, y0),
         points1 = d3_svg_linePoints(this, d, x0 === x1 ? d3_svg_areaX(points0) : x1, y0 === y1 ? d3_svg_areaY(points0) : y1);
-    return "M" + interpolator(projection(points1), tension)
-         + "L" + interpolator(projection(points0.reverse()), tension)
+    return "M" + i0(projection(points1), tension)
+         + "L" + i1(projection(points0.reverse()), tension)
          + "Z";
   }
 
@@ -3198,7 +3297,8 @@ function d3_svg_area(projection) {
 
   area.interpolate = function(x) {
     if (!arguments.length) return interpolate;
-    interpolator = d3_svg_lineInterpolators[interpolate = x];
+    i0 = d3_svg_lineInterpolators[interpolate = x];
+    i1 = i0.reverse || i0;
     return area;
   };
 
@@ -3208,9 +3308,12 @@ function d3_svg_area(projection) {
     return area;
   };
 
-  return area;
+  return area.interpolate("linear");
 }
 
+d3_svg_lineStepBefore.reverse = d3_svg_lineStepAfter;
+d3_svg_lineStepAfter.reverse = d3_svg_lineStepBefore;
+
 d3.svg.area = function() {
   return d3_svg_area(Object);
 };
@@ -3545,6 +3648,20 @@ d3.svg.axis = function() {
     selection.each(function(d, i, j) {
       var g = d3.select(this);
 
+      // If selection is a transition, create subtransitions.
+      var transition = selection.delay ? function(o) {
+        var id = d3_transitionInheritId;
+        try {
+          d3_transitionInheritId = selection.id;
+          return o.transition()
+              .delay(selection[j][i].delay)
+              .duration(selection[j][i].duration)
+              .ease(selection.ease());
+        } finally {
+          d3_transitionInheritId = id;
+        }
+      } : Object;
+
       // Ticks.
       var ticks = scale.ticks.apply(scale, tickArguments_),
           tickFormat = tickFormat_ == null ? scale.tickFormat.apply(scale, tickArguments_) : tickFormat_;
@@ -3580,37 +3697,33 @@ d3.svg.axis = function() {
       switch (orient) {
         case "bottom": {
           tickTransform = d3_svg_axisX;
-          subtickUpdate.attr("y2", tickMinorSize);
-          tickEnter.select("text").attr("dy", ".71em").attr("text-anchor", "middle");
-          tickUpdate.select("line").attr("y2", tickMajorSize);
-          tickUpdate.select("text").attr("y", Math.max(tickMajorSize, 0) + tickPadding);
+          subtickUpdate.attr("x2", 0).attr("y2", tickMinorSize);
+          tickUpdate.select("line").attr("x2", 0).attr("y2", tickMajorSize);
+          tickUpdate.select("text").attr("x", 0).attr("y", Math.max(tickMajorSize, 0) + tickPadding).attr("dy", ".71em").attr("text-anchor", "middle");
           pathUpdate.attr("d", "M" + range[0] + "," + tickEndSize + "V0H" + range[1] + "V" + tickEndSize);
           break;
         }
         case "top": {
           tickTransform = d3_svg_axisX;
-          subtickUpdate.attr("y2", -tickMinorSize);
-          tickEnter.select("text").attr("text-anchor", "middle");
-          tickUpdate.select("line").attr("y2", -tickMajorSize);
-          tickUpdate.select("text").attr("y", -(Math.max(tickMajorSize, 0) + tickPadding));
+          subtickUpdate.attr("x2", 0).attr("y2", -tickMinorSize);
+          tickUpdate.select("line").attr("x2", 0).attr("y2", -tickMajorSize);
+          tickUpdate.select("text").attr("x", 0).attr("y", -(Math.max(tickMajorSize, 0) + tickPadding)).attr("dy", "0em").attr("text-anchor", "middle");
           pathUpdate.attr("d", "M" + range[0] + "," + -tickEndSize + "V0H" + range[1] + "V" + -tickEndSize);
           break;
         }
         case "left": {
           tickTransform = d3_svg_axisY;
-          subtickUpdate.attr("x2", -tickMinorSize);
-          tickEnter.select("text").attr("dy", ".32em").attr("text-anchor", "end");
-          tickUpdate.select("line").attr("x2", -tickMajorSize);
-          tickUpdate.select("text").attr("x", -(Math.max(tickMajorSize, 0) + tickPadding));
+          subtickUpdate.attr("x2", -tickMinorSize).attr("y2", 0);
+          tickUpdate.select("line").attr("x2", -tickMajorSize).attr("y2", 0);
+          tickUpdate.select("text").attr("x", -(Math.max(tickMajorSize, 0) + tickPadding)).attr("y", 0).attr("dy", ".32em").attr("text-anchor", "end");
           pathUpdate.attr("d", "M" + -tickEndSize + "," + range[0] + "H0V" + range[1] + "H" + -tickEndSize);
           break;
         }
         case "right": {
           tickTransform = d3_svg_axisY;
-          subtickUpdate.attr("x2", tickMinorSize);
-          tickEnter.select("text").attr("dy", ".32em");
-          tickUpdate.select("line").attr("x2", tickMajorSize);
-          tickUpdate.select("text").attr("x", Math.max(tickMajorSize, 0) + tickPadding);
+          subtickUpdate.attr("x2", tickMinorSize).attr("y2", 0);
+          tickUpdate.select("line").attr("x2", tickMajorSize).attr("y2", 0);
+          tickUpdate.select("text").attr("x", Math.max(tickMajorSize, 0) + tickPadding).attr("y", 0).attr("dy", ".32em").attr("text-anchor", "start");
           pathUpdate.attr("d", "M" + tickEndSize + "," + range[0] + "H0V" + range[1] + "H" + tickEndSize);
           break;
         }
@@ -3623,13 +3736,6 @@ d3.svg.axis = function() {
       subtickEnter.call(tickTransform, scale0);
       subtickUpdate.call(tickTransform, scale);
       subtickExit.call(tickTransform, scale);
-
-      function transition(o) {
-        return selection.delay ? o.transition()
-            .delay(selection[j][i].delay)
-            .duration(selection[j][i].duration)
-            .ease(selection.ease()) : o;
-      }
     });
   }
 
diff --git a/media/d3.layout.js b/media/d3.layout.js
index bcfddc0..2bfb9d3 100644
--- a/media/d3.layout.js
+++ b/media/d3.layout.js
@@ -560,9 +560,9 @@ d3.layout.partition = function() {
     node.y = node.depth * dy;
     node.dx = dx;
     node.dy = dy;
-    if (children) {
+    if (children && (n = children.length)) {
       var i = -1,
-          n = children.length,
+          n,
           c,
           d;
       dx = node.value ? dx / node.value : 0;
@@ -576,9 +576,9 @@ d3.layout.partition = function() {
   function depth(node) {
     var children = node.children,
         d = 0;
-    if (children) {
+    if (children && (n = children.length)) {
       var i = -1,
-          n = children.length;
+          n;
       while (++i < n) d = Math.max(d, depth(children[i]));
     }
     return 1 + d;
@@ -1477,9 +1477,9 @@ d3.layout.tree = function() {
     function secondWalk(node, x) {
       node.x = node._tree.prelim + x;
       var children = node.children;
-      if (children) {
+      if (children && (n = children.length)) {
         var i = -1,
-            n = children.length;
+            n;
         x += node._tree.mod;
         while (++i < n) {
           secondWalk(children[i], x);
@@ -1584,18 +1584,21 @@ function d3_layout_treeSeparation(a, b) {
 // }
 
 function d3_layout_treeLeft(node) {
-  return node.children ? node.children[0] : node._tree.thread;
+  var children = node.children;
+  return children && children.length ? children[0] : node._tree.thread;
 }
 
 function d3_layout_treeRight(node) {
-  return node.children ? node.children[node.children.length - 1] : node._tree.thread;
+  var children = node.children,
+      n;
+  return children && (n = children.length) ? children[n - 1] : node._tree.thread;
 }
 
 function d3_layout_treeSearch(node, compare) {
   var children = node.children;
-  if (children) {
+  if (children && (n = children.length)) {
     var child,
-        n = children.length,
+        n,
         i = -1;
     while (++i < n) {
       if (compare(child = d3_layout_treeSearch(children[i], compare), node) > 0) {
@@ -1621,11 +1624,11 @@ function d3_layout_treeDeepest(a, b) {
 function d3_layout_treeVisitAfter(node, callback) {
   function visit(node, previousSibling) {
     var children = node.children;
-    if (children) {
+    if (children && (n = children.length)) {
       var child,
           previousChild = null,
           i = -1,
-          n = children.length;
+          n;
       while (++i < n) {
         child = children[i];
         visit(child, previousChild);
@@ -1693,57 +1696,61 @@ d3.layout.treemap = function() {
 
   // Recursively arranges the specified node's children into squarified rows.
   function squarify(node) {
-    if (!node.children) return;
-    var rect = pad(node),
-        row = [],
-        children = node.children.slice(), // copy-on-write
-        child,
-        best = Infinity, // the best row score so far
-        score, // the current row score
-        u = Math.min(rect.dx, rect.dy), // initial orientation
-        n;
-    scale(children, rect.dx * rect.dy / node.value);
-    row.area = 0;
-    while ((n = children.length) > 0) {
-      row.push(child = children[n - 1]);
-      row.area += child.area;
-      if ((score = worst(row, u)) <= best) { // continue with this orientation
-        children.pop();
-        best = score;
-      } else { // abort, and try a different orientation
-        row.area -= row.pop().area;
-        position(row, u, rect, false);
-        u = Math.min(rect.dx, rect.dy);
+    var children = node.children;
+    if (children && children.length) {
+      var rect = pad(node),
+          row = [],
+          remaining = children.slice(), // copy-on-write
+          child,
+          best = Infinity, // the best row score so far
+          score, // the current row score
+          u = Math.min(rect.dx, rect.dy), // initial orientation
+          n;
+      scale(remaining, rect.dx * rect.dy / node.value);
+      row.area = 0;
+      while ((n = remaining.length) > 0) {
+        row.push(child = remaining[n - 1]);
+        row.area += child.area;
+        if ((score = worst(row, u)) <= best) { // continue with this orientation
+          remaining.pop();
+          best = score;
+        } else { // abort, and try a different orientation
+          row.area -= row.pop().area;
+          position(row, u, rect, false);
+          u = Math.min(rect.dx, rect.dy);
+          row.length = row.area = 0;
+          best = Infinity;
+        }
+      }
+      if (row.length) {
+        position(row, u, rect, true);
         row.length = row.area = 0;
-        best = Infinity;
       }
+      children.forEach(squarify);
     }
-    if (row.length) {
-      position(row, u, rect, true);
-      row.length = row.area = 0;
-    }
-    node.children.forEach(squarify);
   }
 
   // Recursively resizes the specified node's children into existing rows.
   // Preserves the existing layout!
   function stickify(node) {
-    if (!node.children) return;
-    var rect = pad(node),
-        children = node.children.slice(), // copy-on-write
-        child,
-        row = [];
-    scale(children, rect.dx * rect.dy / node.value);
-    row.area = 0;
-    while (child = children.pop()) {
-      row.push(child);
-      row.area += child.area;
-      if (child.z != null) {
-        position(row, child.z ? rect.dx : rect.dy, rect, !children.length);
-        row.length = row.area = 0;
+    var children = node.children;
+    if (children && children.length) {
+      var rect = pad(node),
+          remaining = children.slice(), // copy-on-write
+          child,
+          row = [];
+      scale(remaining, rect.dx * rect.dy / node.value);
+      row.area = 0;
+      while (child = remaining.pop()) {
+        row.push(child);
+        row.area += child.area;
+        if (child.z != null) {
+          position(row, child.z ? rect.dx : rect.dy, rect, !remaining.length);
+          row.length = row.area = 0;
+        }
       }
+      children.forEach(stickify);
     }
-    node.children.forEach(stickify);
   }
 
   // Computes the score for the specified row, as the worst aspect ratio.
diff --git a/media/d3.layout.min.js b/media/d3.layout.min.js
index e49c8c7..c7016b5 100644
--- a/media/d3.layout.min.js
+++ b/media/d3.layout.min.js
@@ -1 +1 @@
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