D3 Example: Global Surface Temperature: 500 ... 2009

readme.md

D3 Example: Global Surface Temperature: 500 ... 2009

This example is based on the Mann surface temperature reconstruction, 500-2009. Mann's original paper Global Signatures and Dynamical Origins of the Little Ice Age and Medieval Climate Anomaly.

Mann's data are the temperature anomalies from the 30 year global average from 1961 through 1999 of 14.0 degrees C developed by Jones et al, 1999 SURFACE AIR TEMPERATURE AND ITS CHANGES OVER THE PAST 150 YEARS.

Graph Features

• Drag on the canvas to translate/pan the graph.
• double-click on the canvas to zoom in
• shift-double-click on the canvas to zoom out
• Drag on one of the X or Y axis numeric labels to re-scale that axis
• click on a data point to select it
• drag a selected data point to change it's value
• enter the delete or backspace key to delete a selected data point
• drag a selected data point to change it's value
• hold the ALT/Option key down and click an empty area of the graph to add a data point

Dragging to re-scale the axes does not yet work with touch events.

source: gist.github.com/gists/1184766

d3.js

(function(){if (!Date.now) Date.now = function() {
  return +new Date;
};
try {
  document.createElement("div").style.setProperty("opacity", 0, "");
} catch (error) {
  var d3_style_prototype = CSSStyleDeclaration.prototype,
      d3_style_setProperty = d3_style_prototype.setProperty;
  d3_style_prototype.setProperty = function(name, value, priority) {
    d3_style_setProperty.call(this, name, value + "", priority);
  };
}
d3 = {version: "2.4.5"}; // semver
var d3_array = d3_arraySlice; // conversion for NodeLists

function d3_arrayCopy(pseudoarray) {
  var i = -1, n = pseudoarray.length, array = [];
  while (++i < n) array.push(pseudoarray[i]);
  return array;
}

function d3_arraySlice(pseudoarray) {
  return Array.prototype.slice.call(pseudoarray);
}

try {
  d3_array(document.documentElement.childNodes)[0].nodeType;
} catch(e) {
  d3_array = d3_arrayCopy;
}

var d3_arraySubclass = [].__proto__?

// Until ECMAScript supports array subclassing, prototype injection works well.
function(array, prototype) {
  array.__proto__ = prototype;
}:

// And if your browser doesn't support __proto__, we'll use direct extension.
function(array, prototype) {
  for (var property in prototype) array[property] = prototype[property];
};
function d3_this() {
  return this;
}
d3.functor = function(v) {
  return typeof v === "function" ? v : function() { return v; };
};
// A getter-setter method that preserves the appropriate `this` context.
d3.rebind = function(object, method) {
  return function() {
    var x = method.apply(object, arguments);
    return arguments.length ? object : x;
  };
};
d3.ascending = function(a, b) {
  return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
};
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,
      a,
      b;
  if (arguments.length === 1) {
    while (++i < n && ((a = array[i]) == null || a != a)) a = undefined;
    while (++i < n) if ((b = array[i]) != null && a > b) a = b;
  } else {
    while (++i < n && ((a = f.call(array, array[i], i)) == null || a != a)) a = undefined;
    while (++i < n) if ((b = f.call(array, array[i], i)) != null && a > b) a = b;
  }
  return a;
};
d3.max = function(array, f) {
  var i = -1,
      n = array.length,
      a,
      b;
  if (arguments.length === 1) {
    while (++i < n && ((a = array[i]) == null || a != a)) a = undefined;
    while (++i < n) if ((b = array[i]) != null && b > a) a = b;
  } else {
    while (++i < n && ((a = f.call(array, array[i], i)) == null || a != a)) a = undefined;
    while (++i < n) if ((b = f.call(array, array[i], i)) != null && b > a) a = b;
  }
  return a;
};
function d3_number(x) {
  return x != null && !isNaN(x);
}
d3.sum = function(array, f) {
  var s = 0,
      n = array.length,
      a,
      i = -1;

  if (arguments.length === 1) {
    while (++i < n) if (!isNaN(a = +array[i])) s += a;
  } else {
    while (++i < n) if (!isNaN(a = +f.call(array, array[i], i))) s += a;
  }

  return s;
};
// R-7 per <http://en.wikipedia.org/wiki/Quantile>
d3.quantile = function(values, p) {
  var H = (values.length - 1) * p + 1,
      h = Math.floor(H),
      v = values[h - 1],
      e = H - h;
  return e ? v + e * (values[h] - v) : v;
};
d3.zip = function() {
  if (!(n = arguments.length)) return [];
  for (var i = -1, m = d3.min(arguments, d3_zipLength), zips = new Array(m); ++i < m;) {
    for (var j = -1, n, zip = zips[i] = new Array(n); ++j < n;) {
      zip[j] = arguments[j][i];
    }
  }
  return zips;
};

function d3_zipLength(d) {
  return d.length;
}
// Locate the insertion point for x in a to maintain sorted order. The
// arguments lo and hi may be used to specify a subset of the array which should
// be considered; by default the entire array is used. If x is already present
// in a, the insertion point will be before (to the left of) any existing
// entries. The return value is suitable for use as the first argument to
// `array.splice` assuming that a is already sorted.
//
// The returned insertion point i partitions the array a into two halves so that
// all v < x for v in a[lo:i] for the left side and all v >= x for v in a[i:hi]
// for the right side.
d3.bisectLeft = function(a, x, lo, hi) {
  if (arguments.length < 3) lo = 0;
  if (arguments.length < 4) hi = a.length;
  while (lo < hi) {
    var mid = (lo + hi) >> 1;
    if (a[mid] < x) lo = mid + 1;
    else hi = mid;
  }
  return lo;
};

// Similar to bisectLeft, but returns an insertion point which comes after (to
// the right of) any existing entries of x in a.
//
// The returned insertion point i partitions the array into two halves so that
// all v <= x for v in a[lo:i] for the left side and all v > x for v in a[i:hi]
// for the right side.
d3.bisect =
d3.bisectRight = function(a, x, lo, hi) {
  if (arguments.length < 3) lo = 0;
  if (arguments.length < 4) hi = a.length;
  while (lo < hi) {
    var mid = (lo + hi) >> 1;
    if (x < a[mid]) hi = mid;
    else lo = mid + 1;
  }
  return lo;
};
d3.first = function(array, f) {
  var i = 0,
      n = array.length,
      a = array[0],
      b;
  if (arguments.length === 1) f = d3.ascending;
  while (++i < n) {
    if (f.call(array, a, b = array[i]) > 0) {
      a = b;
    }
  }
  return a;
};
d3.last = function(array, f) {
  var i = 0,
      n = array.length,
      a = array[0],
      b;
  if (arguments.length === 1) f = d3.ascending;
  while (++i < n) {
    if (f.call(array, a, b = array[i]) <= 0) {
      a = b;
    }
  }
  return a;
};
d3.nest = function() {
  var nest = {},
      keys = [],
      sortKeys = [],
      sortValues,
      rollup;

  function map(array, depth) {
    if (depth >= keys.length) return rollup
        ? rollup.call(nest, array) : (sortValues
        ? array.sort(sortValues)
        : array);

    var i = -1,
        n = array.length,
        key = keys[depth++],
        keyValue,
        object,
        o = {};

    while (++i < n) {
      if ((keyValue = key(object = array[i])) in o) {
        o[keyValue].push(object);
      } else {
        o[keyValue] = [object];
      }
    }

    for (keyValue in o) {
      o[keyValue] = map(o[keyValue], depth);
    }

    return o;
  }

  function entries(map, depth) {
    if (depth >= keys.length) return map;

    var a = [],
        sortKey = sortKeys[depth++],
        key;

    for (key in map) {
      a.push({key: key, values: entries(map[key], depth)});
    }

    if (sortKey) a.sort(function(a, b) {
      return sortKey(a.key, b.key);
    });

    return a;
  }

  nest.map = function(array) {
    return map(array, 0);
  };

  nest.entries = function(array) {
    return entries(map(array, 0), 0);
  };

  nest.key = function(d) {
    keys.push(d);
    return nest;
  };

  // Specifies the order for the most-recently specified key.
  // Note: only applies to entries. Map keys are unordered!
  nest.sortKeys = function(order) {
    sortKeys[keys.length - 1] = order;
    return nest;
  };

  // Specifies the order for leaf values.
  // Applies to both maps and entries array.
  nest.sortValues = function(order) {
    sortValues = order;
    return nest;
  };

  nest.rollup = function(f) {
    rollup = f;
    return nest;
  };

  return nest;
};
d3.keys = function(map) {
  var keys = [];
  for (var key in map) keys.push(key);
  return keys;
};
d3.values = function(map) {
  var values = [];
  for (var key in map) values.push(map[key]);
  return values;
};
d3.entries = function(map) {
  var entries = [];
  for (var key in map) entries.push({key: key, value: map[key]});
  return entries;
};
d3.permute = function(array, indexes) {
  var permutes = [],
      i = -1,
      n = indexes.length;
  while (++i < n) permutes[i] = array[indexes[i]];
  return permutes;
};
d3.merge = function(arrays) {
  return Array.prototype.concat.apply([], arrays);
};
d3.split = function(array, f) {
  var arrays = [],
      values = [],
      value,
      i = -1,
      n = array.length;
  if (arguments.length < 2) f = d3_splitter;
  while (++i < n) {
    if (f.call(values, value = array[i], i)) {
      values = [];
    } else {
      if (!values.length) arrays.push(values);
      values.push(value);
    }
  }
  return arrays;
};

function d3_splitter(d) {
  return d == null;
}
function d3_collapse(s) {
  return s.replace(/(^\s+)|(\s+$)/g, "").replace(/\s+/g, " ");
}
/**
 * @param {number} start
 * @param {number=} stop
 * @param {number=} step
 */
d3.range = function(start, stop, step) {
  if (arguments.length < 3) {
    step = 1;
    if (arguments.length < 2) {
      stop = start;
      start = 0;
    }
  }
  if ((stop - start) / step == Infinity) throw new Error("infinite range");
  var range = [],
       i = -1,
       j;
  if (step < 0) while ((j = start + step * ++i) > stop) range.push(j);
  else while ((j = start + step * ++i) < stop) range.push(j);
  return range;
};
d3.requote = function(s) {
  return s.replace(d3_requote_re, "\\$&");
};

var d3_requote_re = /[\\\^\$\*\+\?\|\[\]\(\)\.\{\}]/g;
d3.round = function(x, n) {
  return n
      ? Math.round(x * Math.pow(10, n)) * Math.pow(10, -n)
      : Math.round(x);
};
d3.xhr = function(url, mime, callback) {
  var req = new XMLHttpRequest;
  if (arguments.length < 3) callback = mime;
  else if (mime && req.overrideMimeType) req.overrideMimeType(mime);
  req.open("GET", url, true);
  req.onreadystatechange = function() {
    if (req.readyState === 4) callback(req.status < 300 ? req : null);
  };
  req.send(null);
};
d3.text = function(url, mime, callback) {
  function ready(req) {
    callback(req && req.responseText);
  }
  if (arguments.length < 3) {
    callback = mime;
    mime = null;
  }
  d3.xhr(url, mime, ready);
};
d3.json = function(url, callback) {
  d3.text(url, "application/json", function(text) {
    callback(text ? JSON.parse(text) : null);
  });
};
d3.html = function(url, callback) {
  d3.text(url, "text/html", function(text) {
    if (text != null) { // Treat empty string as valid HTML.
      var range = document.createRange();
      range.selectNode(document.body);
      text = range.createContextualFragment(text);
    }
    callback(text);
  });
};
d3.xml = function(url, mime, callback) {
  function ready(req) {
    callback(req && req.responseXML);
  }
  if (arguments.length < 3) {
    callback = mime;
    mime = null;
  }
  d3.xhr(url, mime, ready);
};
d3.ns = {

  prefix: {
    svg: "http://www.w3.org/2000/svg",
    xhtml: "http://www.w3.org/1999/xhtml",
    xlink: "http://www.w3.org/1999/xlink",
    xml: "http://www.w3.org/XML/1998/namespace",
    xmlns: "http://www.w3.org/2000/xmlns/"
  },

  qualify: function(name) {
    var i = name.indexOf(":");
    return i < 0 ? name : {
      space: d3.ns.prefix[name.substring(0, i)],
      local: name.substring(i + 1)
    };
  }

};
/** @param {...string} types */
d3.dispatch = function(types) {
  var dispatch = {},
      type;
  for (var i = 0, n = arguments.length; i < n; i++) {
    type = arguments[i];
    dispatch[type] = d3_dispatch(type);
  }
  return dispatch;
};

function d3_dispatch(type) {
  var dispatch = {},
      listeners = [];

  dispatch.add = function(listener) {
    for (var i = 0; i < listeners.length; i++) {
      if (listeners[i].listener == listener) return dispatch; // already registered
    }
    listeners.push({listener: listener, on: true});
    return dispatch;
  };

  dispatch.remove = function(listener) {
    for (var i = 0; i < listeners.length; i++) {
      var l = listeners[i];
      if (l.listener == listener) {
        l.on = false;
        listeners = listeners.slice(0, i).concat(listeners.slice(i + 1));
        break;
      }
    }
    return dispatch;
  };

  dispatch.dispatch = function() {
    var ls = listeners; // defensive reference
    for (var i = 0, n = ls.length; i < n; i++) {
      var l = ls[i];
      if (l.on) l.listener.apply(this, arguments);
    }
  };

  return dispatch;
};
// TODO align
d3.format = function(specifier) {
  var match = d3_format_re.exec(specifier),
      fill = match[1] || " ",
      sign = match[3] || "",
      zfill = match[5],
      width = +match[6],
      comma = match[7],
      precision = match[8],
      type = match[9],
      scale = 1,
      suffix = "",
      integer = false;

  if (precision) precision = +precision.substring(1);

  if (zfill) {
    fill = "0"; // TODO align = "=";
    if (comma) width -= Math.floor((width - 1) / 4);
  }

  switch (type) {
    case "n": comma = true; type = "g"; 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) {

    // Return the empty string for floats formatted as ints.
    if (integer && (value % 1)) return "";

    // 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) {
      var length = value.length + negative.length;
      if (length < width) value = new Array(width - length + 1).join(fill) + value;
      if (comma) value = d3_format_group(value);
      value = negative + value;
    }

    // Otherwise (e.g., space-filling), the sign and group is applied before.
    else {
      if (comma) value = d3_format_group(value);
      value = negative + value;
      var length = value.length;
      if (length < width) value = new Array(width - length + 1).join(fill) + value;
    }

    return value + suffix;
  };
};

// [[fill]align][sign][#][0][width][,][.precision][type]
var d3_format_re = /(?:([^{])?([<>=^]))?([+\- ])?(#)?(0)?([0-9]+)?(,)?(\.[0-9]+)?([a-zA-Z%])?/;

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) { 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 + "";
}

// Apply comma grouping for thousands.
function d3_format_group(value) {
  var i = value.lastIndexOf("."),
      f = i >= 0 ? value.substring(i) : (i = value.length, ""),
      t = [];
  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
 *
 * Open source under the BSD License.
 *
 * Copyright 2001 Robert Penner
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * - Neither the name of the author nor the names of contributors may be used to
 *   endorse or promote products derived from this software without specific
 *   prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

var d3_ease_quad = d3_ease_poly(2),
    d3_ease_cubic = d3_ease_poly(3);

var d3_ease = {
  linear: function() { return d3_ease_linear; },
  poly: d3_ease_poly,
  quad: function() { return d3_ease_quad; },
  cubic: function() { return d3_ease_cubic; },
  sin: function() { return d3_ease_sin; },
  exp: function() { return d3_ease_exp; },
  circle: function() { return d3_ease_circle; },
  elastic: d3_ease_elastic,
  back: d3_ease_back,
  bounce: function() { return d3_ease_bounce; }
};

var d3_ease_mode = {
  "in": function(f) { return f; },
  "out": d3_ease_reverse,
  "in-out": d3_ease_reflect,
  "out-in": function(f) { return d3_ease_reflect(d3_ease_reverse(f)); }
};

d3.ease = function(name) {
  var i = name.indexOf("-"),
      t = i >= 0 ? name.substring(0, i) : name,
      m = i >= 0 ? name.substring(i + 1) : "in";
  return d3_ease_clamp(d3_ease_mode[m](d3_ease[t].apply(null, Array.prototype.slice.call(arguments, 1))));
};

function d3_ease_clamp(f) {
  return function(t) {
    return t <= 0 ? 0 : t >= 1 ? 1 : f(t);
  };
}

function d3_ease_reverse(f) {
  return function(t) {
    return 1 - f(1 - t);
  };
}

function d3_ease_reflect(f) {
  return function(t) {
    return .5 * (t < .5 ? f(2 * t) : (2 - f(2 - 2 * t)));
  };
}

function d3_ease_linear(t) {
  return t;
}

function d3_ease_poly(e) {
  return function(t) {
    return Math.pow(t, e);
  }
}

function d3_ease_sin(t) {
  return 1 - Math.cos(t * Math.PI / 2);
}

function d3_ease_exp(t) {
  return Math.pow(2, 10 * (t - 1));
}

function d3_ease_circle(t) {
  return 1 - Math.sqrt(1 - t * t);
}

function d3_ease_elastic(a, p) {
  var s;
  if (arguments.length < 2) p = 0.45;
  if (arguments.length < 1) { a = 1; s = p / 4; }
  else s = p / (2 * Math.PI) * Math.asin(1 / a);
  return function(t) {
    return 1 + a * Math.pow(2, 10 * -t) * Math.sin((t - s) * 2 * Math.PI / p);
  };
}

function d3_ease_back(s) {
  if (!s) s = 1.70158;
  return function(t) {
    return t * t * ((s + 1) * t - s);
  };
}

function d3_ease_bounce(t) {
  return t < 1 / 2.75 ? 7.5625 * t * t
      : t < 2 / 2.75 ? 7.5625 * (t -= 1.5 / 2.75) * t + .75
      : t < 2.5 / 2.75 ? 7.5625 * (t -= 2.25 / 2.75) * t + .9375
      : 7.5625 * (t -= 2.625 / 2.75) * t + .984375;
}
d3.event = null;
d3.interpolate = function(a, b) {
  var i = d3.interpolators.length, f;
  while (--i >= 0 && !(f = d3.interpolators[i](a, b)));
  return f;
};

d3.interpolateNumber = function(a, b) {
  b -= a;
  return function(t) { return a + b * t; };
};

d3.interpolateRound = function(a, b) {
  b -= a;
  return function(t) { return Math.round(a + b * t); };
};

d3.interpolateString = function(a, b) {
  var m, // current match
      i, // current index
      j, // current index (for coallescing)
      s0 = 0, // start index of current string prefix
      s1 = 0, // end index of current string prefix
      s = [], // string constants and placeholders
      q = [], // number interpolators
      n, // q.length
      o;

  // Reset our regular expression!
  d3_interpolate_number.lastIndex = 0;

  // Find all numbers in b.
  for (i = 0; m = d3_interpolate_number.exec(b); ++i) {
    if (m.index) s.push(b.substring(s0, s1 = m.index));
    q.push({i: s.length, x: m[0]});
    s.push(null);
    s0 = d3_interpolate_number.lastIndex;
  }
  if (s0 < b.length) s.push(b.substring(s0));

  // Find all numbers in a.
  for (i = 0, n = q.length; (m = d3_interpolate_number.exec(a)) && i < n; ++i) {
    o = q[i];
    if (o.x == m[0]) { // The numbers match, so coallesce.
      if (o.i) {
        if (s[o.i + 1] == null) { // This match is followed by another number.
          s[o.i - 1] += o.x;
          s.splice(o.i, 1);
          for (j = i + 1; j < n; ++j) q[j].i--;
        } else { // This match is followed by a string, so coallesce twice.
          s[o.i - 1] += o.x + s[o.i + 1];
          s.splice(o.i, 2);
          for (j = i + 1; j < n; ++j) q[j].i -= 2;
        }
      } else {
          if (s[o.i + 1] == null) { // This match is followed by another number.
          s[o.i] = o.x;
        } else { // This match is followed by a string, so coallesce twice.
          s[o.i] = o.x + s[o.i + 1];
          s.splice(o.i + 1, 1);
          for (j = i + 1; j < n; ++j) q[j].i--;
        }
      }
      q.splice(i, 1);
      n--;
      i--;
    } else {
      o.x = d3.interpolateNumber(parseFloat(m[0]), parseFloat(o.x));
    }
  }

  // Remove any numbers in b not found in a.
  while (i < n) {
    o = q.pop();
    if (s[o.i + 1] == null) { // This match is followed by another number.
      s[o.i] = o.x;
    } else { // This match is followed by a string, so coallesce twice.
      s[o.i] = o.x + s[o.i + 1];
      s.splice(o.i + 1, 1);
    }
    n--;
  }

  // Special optimization for only a single match.
  if (s.length === 1) {
    return s[0] == null ? q[0].x : function() { return b; };
  }

  // Otherwise, interpolate each of the numbers and rejoin the string.
  return function(t) {
    for (i = 0; i < n; ++i) s[(o = q[i]).i] = o.x(t);
    return s.join("");
  };
};

d3.interpolateRgb = function(a, b) {
  a = d3.rgb(a);
  b = d3.rgb(b);
  var ar = a.r,
      ag = a.g,
      ab = a.b,
      br = b.r - ar,
      bg = b.g - ag,
      bb = b.b - ab;
  return function(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));
  };
};

// interpolates HSL space, but outputs RGB string (for compatibility)
d3.interpolateHsl = function(a, b) {
  a = d3.hsl(a);
  b = d3.hsl(b);
  var h0 = a.h,
      s0 = a.s,
      l0 = a.l,
      h1 = b.h - h0,
      s1 = b.s - s0,
      l1 = b.l - l0;
  return function(t) {
    return d3_hsl_rgb(h0 + h1 * t, s0 + s1 * t, l0 + l1 * t).toString();
  };
};

d3.interpolateArray = function(a, b) {
  var x = [],
      c = [],
      na = a.length,
      nb = b.length,
      n0 = Math.min(a.length, b.length),
      i;
  for (i = 0; i < n0; ++i) x.push(d3.interpolate(a[i], b[i]));
  for (; i < na; ++i) c[i] = a[i];
  for (; i < nb; ++i) c[i] = b[i];
  return function(t) {
    for (i = 0; i < n0; ++i) c[i] = x[i](t);
    return c;
  };
};

d3.interpolateObject = function(a, b) {
  var i = {},
      c = {},
      k;
  for (k in a) {
    if (k in b) {
      i[k] = d3_interpolateByName(k)(a[k], b[k]);
    } else {
      c[k] = a[k];
    }
  }
  for (k in b) {
    if (!(k in a)) {
      c[k] = b[k];
    }
  }
  return function(t) {
    for (k in i) c[k] = i[k](t);
    return c;
  };
}

var d3_interpolate_number = /[-+]?(?:\d+\.\d+|\d+\.|\.\d+|\d+)(?:[eE][-]?\d+)?/g,
    d3_interpolate_rgb = {background: 1, fill: 1, stroke: 1};

function d3_interpolateByName(n) {
  return n in d3_interpolate_rgb || /\bcolor\b/.test(n)
      ? d3.interpolateRgb
      : d3.interpolate;
}

d3.interpolators = [
  d3.interpolateObject,
  function(a, b) { return (b instanceof Array) && d3.interpolateArray(a, b); },
  function(a, b) { return (typeof b === "string") && d3.interpolateString(String(a), b); },
  function(a, b) { return (typeof b === "string" ? b in d3_rgb_names || /^(#|rgb\(|hsl\()/.test(b) : b instanceof d3_Rgb || b instanceof d3_Hsl) && d3.interpolateRgb(String(a), b); },
  function(a, b) { return (typeof b === "number") && d3.interpolateNumber(+a, b); }
];
function d3_uninterpolateNumber(a, b) {
  b = b - (a = +a) ? 1 / (b - a) : 0;
  return function(x) { return (x - a) * b; };
}

function d3_uninterpolateClamp(a, b) {
  b = b - (a = +a) ? 1 / (b - a) : 0;
  return function(x) { return Math.max(0, Math.min(1, (x - a) * b)); };
}
d3.rgb = function(r, g, b) {
  return arguments.length === 1
      ? (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);
};

function d3_rgb(r, g, b) {
  return new d3_Rgb(r, g, b);
}

function d3_Rgb(r, g, b) {
  this.r = r;
  this.g = g;
  this.b = b;
}

d3_Rgb.prototype.brighter = function(k) {
  k = Math.pow(0.7, arguments.length ? k : 1);
  var r = this.r,
      g = this.g,
      b = this.b,
      i = 30;
  if (!r && !g && !b) return d3_rgb(i, i, i);
  if (r && r < i) r = i;
  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)));
};

d3_Rgb.prototype.darker = function(k) {
  k = Math.pow(0.7, arguments.length ? k : 1);
  return d3_rgb(
      Math.floor(k * this.r),
      Math.floor(k * this.g),
      Math.floor(k * this.b));
};

d3_Rgb.prototype.hsl = function() {
  return d3_rgb_hsl(this.r, this.g, this.b);
};

d3_Rgb.prototype.toString = function() {
  return "#" + d3_rgb_hex(this.r) + d3_rgb_hex(this.g) + d3_rgb_hex(this.b);
};

function d3_rgb_hex(v) {
  return v < 0x10
      ? "0" + Math.max(0, v).toString(16)
      : Math.min(255, v).toString(16);
}

function d3_rgb_parse(format, rgb, hsl) {
  var r = 0, // red channel; int in [0, 255]
      g = 0, // green channel; int in [0, 255]
      b = 0, // blue channel; int in [0, 255]
      m1, // CSS color specification match
      m2, // CSS color specification type (e.g., rgb)
      name;

  /* Handle hsl, rgb. */
  m1 = /([a-z]+)\((.*)\)/i.exec(format);
  if (m1) {
    m2 = m1[2].split(",");
    switch (m1[1]) {
      case "hsl": {
        return hsl(
          parseFloat(m2[0]), // degrees
          parseFloat(m2[1]) / 100, // percentage
          parseFloat(m2[2]) / 100 // percentage
        );
      }
      case "rgb": {
        return rgb(
          d3_rgb_parseNumber(m2[0]),
          d3_rgb_parseNumber(m2[1]),
          d3_rgb_parseNumber(m2[2])
        );
      }
    }
  }

  /* Named colors. */
  if (name = d3_rgb_names[format]) return rgb(name.r, name.g, name.b);

  /* Hexadecimal colors: #rgb and #rrggbb. */
  if (format != null && format.charAt(0) === "#") {
    if (format.length === 4) {
      r = format.charAt(1); r += r;
      g = format.charAt(2); g += g;
      b = format.charAt(3); b += b;
    } else if (format.length === 7) {
      r = format.substring(1, 3);
      g = format.substring(3, 5);
      b = format.substring(5, 7);
    }
    r = parseInt(r, 16);
    g = parseInt(g, 16);
    b = parseInt(b, 16);
  }

  return rgb(r, g, b);
}

function d3_rgb_hsl(r, g, b) {
  var min = Math.min(r /= 255, g /= 255, b /= 255),
      max = Math.max(r, g, b),
      d = max - min,
      h,
      s,
      l = (max + min) / 2;
  if (d) {
    s = l < .5 ? d / (max + min) : d / (2 - max - min);
    if (r == max) h = (g - b) / d + (g < b ? 6 : 0);
    else if (g == max) h = (b - r) / d + 2;
    else h = (r - g) / d + 4;
    h *= 60;
  } else {
    s = h = 0;
  }
  return d3_hsl(h, s, l);
}

function d3_rgb_parseNumber(c) { // either integer or percentage
  var f = parseFloat(c);
  return c.charAt(c.length - 1) === "%" ? Math.round(f * 2.55) : f;
}

var d3_rgb_names = {
  aliceblue: "#f0f8ff",
  antiquewhite: "#faebd7",
  aqua: "#00ffff",
  aquamarine: "#7fffd4",
  azure: "#f0ffff",
  beige: "#f5f5dc",
  bisque: "#ffe4c4",
  black: "#000000",
  blanchedalmond: "#ffebcd",
  blue: "#0000ff",
  blueviolet: "#8a2be2",
  brown: "#a52a2a",
  burlywood: "#deb887",
  cadetblue: "#5f9ea0",
  chartreuse: "#7fff00",
  chocolate: "#d2691e",
  coral: "#ff7f50",
  cornflowerblue: "#6495ed",
  cornsilk: "#fff8dc",
  crimson: "#dc143c",
  cyan: "#00ffff",
  darkblue: "#00008b",
  darkcyan: "#008b8b",
  darkgoldenrod: "#b8860b",
  darkgray: "#a9a9a9",
  darkgreen: "#006400",
  darkgrey: "#a9a9a9",
  darkkhaki: "#bdb76b",
  darkmagenta: "#8b008b",
  darkolivegreen: "#556b2f",
  darkorange: "#ff8c00",
  darkorchid: "#9932cc",
  darkred: "#8b0000",
  darksalmon: "#e9967a",
  darkseagreen: "#8fbc8f",
  darkslateblue: "#483d8b",
  darkslategray: "#2f4f4f",
  darkslategrey: "#2f4f4f",
  darkturquoise: "#00ced1",
  darkviolet: "#9400d3",
  deeppink: "#ff1493",
  deepskyblue: "#00bfff",
  dimgray: "#696969",
  dimgrey: "#696969",
  dodgerblue: "#1e90ff",
  firebrick: "#b22222",
  floralwhite: "#fffaf0",
  forestgreen: "#228b22",
  fuchsia: "#ff00ff",
  gainsboro: "#dcdcdc",
  ghostwhite: "#f8f8ff",
  gold: "#ffd700",
  goldenrod: "#daa520",
  gray: "#808080",
  green: "#008000",
  greenyellow: "#adff2f",
  grey: "#808080",
  honeydew: "#f0fff0",
  hotpink: "#ff69b4",
  indianred: "#cd5c5c",
  indigo: "#4b0082",
  ivory: "#fffff0",
  khaki: "#f0e68c",
  lavender: "#e6e6fa",
  lavenderblush: "#fff0f5",
  lawngreen: "#7cfc00",
  lemonchiffon: "#fffacd",
  lightblue: "#add8e6",
  lightcoral: "#f08080",
  lightcyan: "#e0ffff",
  lightgoldenrodyellow: "#fafad2",
  lightgray: "#d3d3d3",
  lightgreen: "#90ee90",
  lightgrey: "#d3d3d3",
  lightpink: "#ffb6c1",
  lightsalmon: "#ffa07a",
  lightseagreen: "#20b2aa",
  lightskyblue: "#87cefa",
  lightslategray: "#778899",
  lightslategrey: "#778899",
  lightsteelblue: "#b0c4de",
  lightyellow: "#ffffe0",
  lime: "#00ff00",
  limegreen: "#32cd32",
  linen: "#faf0e6",
  magenta: "#ff00ff",
  maroon: "#800000",
  mediumaquamarine: "#66cdaa",
  mediumblue: "#0000cd",
  mediumorchid: "#ba55d3",
  mediumpurple: "#9370db",
  mediumseagreen: "#3cb371",
  mediumslateblue: "#7b68ee",
  mediumspringgreen: "#00fa9a",
  mediumturquoise: "#48d1cc",
  mediumvioletred: "#c71585",
  midnightblue: "#191970",
  mintcream: "#f5fffa",
  mistyrose: "#ffe4e1",
  moccasin: "#ffe4b5",
  navajowhite: "#ffdead",
  navy: "#000080",
  oldlace: "#fdf5e6",
  olive: "#808000",
  olivedrab: "#6b8e23",
  orange: "#ffa500",
  orangered: "#ff4500",
  orchid: "#da70d6",
  palegoldenrod: "#eee8aa",
  palegreen: "#98fb98",
  paleturquoise: "#afeeee",
  palevioletred: "#db7093",
  papayawhip: "#ffefd5",
  peachpuff: "#ffdab9",
  peru: "#cd853f",
  pink: "#ffc0cb",
  plum: "#dda0dd",
  powderblue: "#b0e0e6",
  purple: "#800080",
  red: "#ff0000",
  rosybrown: "#bc8f8f",
  royalblue: "#4169e1",
  saddlebrown: "#8b4513",
  salmon: "#fa8072",
  sandybrown: "#f4a460",
  seagreen: "#2e8b57",
  seashell: "#fff5ee",
  sienna: "#a0522d",
  silver: "#c0c0c0",
  skyblue: "#87ceeb",
  slateblue: "#6a5acd",
  slategray: "#708090",
  slategrey: "#708090",
  snow: "#fffafa",
  springgreen: "#00ff7f",
  steelblue: "#4682b4",
  tan: "#d2b48c",
  teal: "#008080",
  thistle: "#d8bfd8",
  tomato: "#ff6347",
  turquoise: "#40e0d0",
  violet: "#ee82ee",
  wheat: "#f5deb3",
  white: "#ffffff",
  whitesmoke: "#f5f5f5",
  yellow: "#ffff00",
  yellowgreen: "#9acd32"
};

for (var d3_rgb_name in d3_rgb_names) {
  d3_rgb_names[d3_rgb_name] = d3_rgb_parse(
      d3_rgb_names[d3_rgb_name],
      d3_rgb,
      d3_hsl_rgb);
}
d3.hsl = function(h, s, l) {
  return arguments.length === 1
      ? (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);
};

function d3_hsl(h, s, l) {
  return new d3_Hsl(h, s, l);
}

function d3_Hsl(h, s, l) {
  this.h = h;
  this.s = s;
  this.l = l;
}

d3_Hsl.prototype.brighter = function(k) {
  k = Math.pow(0.7, arguments.length ? k : 1);
  return d3_hsl(this.h, this.s, this.l / k);
};

d3_Hsl.prototype.darker = function(k) {
  k = Math.pow(0.7, arguments.length ? k : 1);
  return d3_hsl(this.h, this.s, k * this.l);
};

d3_Hsl.prototype.rgb = function() {
  return d3_hsl_rgb(this.h, this.s, this.l);
};

d3_Hsl.prototype.toString = function() {
  return this.rgb().toString();
};

function d3_hsl_rgb(h, s, l) {
  var m1,
      m2;

  /* Some simple corrections for h, s and l. */
  h = h % 360; if (h < 0) h += 360;
  s = s < 0 ? 0 : s > 1 ? 1 : s;
  l = l < 0 ? 0 : l > 1 ? 1 : l;

  /* From FvD 13.37, CSS Color Module Level 3 */
  m2 = l <= .5 ? l * (1 + s) : l + s - l * s;
  m1 = 2 * l - m2;

  function v(h) {
    if (h > 360) h -= 360;
    else if (h < 0) h += 360;
    if (h < 60) return m1 + (m2 - m1) * h / 60;
    if (h < 180) return m2;
    if (h < 240) return m1 + (m2 - m1) * (240 - h) / 60;
    return m1;
  }

  function vv(h) {
    return Math.round(v(h) * 255);
  }

  return d3_rgb(vv(h + 120), vv(h), vv(h - 120));
}
function d3_selection(groups) {
  d3_arraySubclass(groups, d3_selectionPrototype);
  return groups;
}

var d3_select = function(s, n) { return n.querySelector(s); },
    d3_selectAll = function(s, n) { return n.querySelectorAll(s); };

// Prefer Sizzle, if available.
if (typeof Sizzle === "function") {
  d3_select = function(s, n) { return Sizzle(s, n)[0]; };
  d3_selectAll = function(s, n) { return Sizzle.uniqueSort(Sizzle(s, n)); };
}

var d3_selectionPrototype = [];

d3.selection = function() {
  return d3_selectionRoot;
};

d3.selection.prototype = d3_selectionPrototype;
d3_selectionPrototype.select = function(selector) {
  var subgroups = [],
      subgroup,
      subnode,
      group,
      node;

  if (typeof selector !== "function") selector = d3_selection_selector(selector);

  for (var j = -1, m = this.length; ++j < m;) {
    subgroups.push(subgroup = []);
    subgroup.parentNode = (group = this[j]).parentNode;
    for (var i = -1, n = group.length; ++i < n;) {
      if (node = group[i]) {
        subgroup.push(subnode = selector.call(node, node.__data__, i));
        if (subnode && "__data__" in node) subnode.__data__ = node.__data__;
      } else {
        subgroup.push(null);
      }
    }
  }

  return d3_selection(subgroups);
};

function d3_selection_selector(selector) {
  return function() {
    return d3_select(selector, this);
  };
}
d3_selectionPrototype.selectAll = function(selector) {
  var subgroups = [],
      subgroup,
      node;

  if (typeof selector !== "function") selector = d3_selection_selectorAll(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 = d3_array(selector.call(node, node.__data__, i)));
        subgroup.parentNode = node;
      }
    }
  }

  return d3_selection(subgroups);
};

function d3_selection_selectorAll(selector) {
  return function() {
    return d3_selectAll(selector, this);
  };
}
d3_selectionPrototype.attr = function(name, value) {
  name = d3.ns.qualify(name);

  // If no value is specified, return the first value.
  if (arguments.length < 2) {
    var node = this.node();
    return name.local
        ? node.getAttributeNS(name.space, name.local)
        : node.getAttribute(name);
  }

  function attrNull() {
    this.removeAttribute(name);
  }

  function attrNullNS() {
    this.removeAttributeNS(name.space, name.local);
  }

  function attrConstant() {
    this.setAttribute(name, value);
  }

  function attrConstantNS() {
    this.setAttributeNS(name.space, name.local, value);
  }

  function attrFunction() {
    var x = value.apply(this, arguments);
    if (x == null) this.removeAttribute(name);
    else this.setAttribute(name, x);
  }

  function attrFunctionNS() {
    var x = value.apply(this, arguments);
    if (x == null) this.removeAttributeNS(name.space, name.local);
    else this.setAttributeNS(name.space, name.local, x);
  }

  return this.each(value == null
      ? (name.local ? attrNullNS : attrNull) : (typeof value === "function"
      ? (name.local ? attrFunctionNS : attrFunction)
      : (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.
  if (arguments.length < 2) {
    var node = this.node();
    if (c = node.classList) return c.contains(name);
    var c = node.className;
    re.lastIndex = 0;
    return re.test(c.baseVal != null ? c.baseVal : c);
  }

  function classedAdd() {
    if (c = this.classList) return c.add(name);
    var c = this.className,
        cb = c.baseVal != null,
        cv = cb ? c.baseVal : c;
    re.lastIndex = 0;
    if (!re.test(cv)) {
      cv = d3_collapse(cv + " " + name);
      if (cb) c.baseVal = cv;
      else this.className = cv;
    }
  }

  function classedRemove() {
    if (c = this.classList) return c.remove(name);
    var c = this.className,
        cb = c.baseVal != null,
        cv = cb ? c.baseVal : c;
    cv = d3_collapse(cv.replace(re, " "));
    if (cb) c.baseVal = cv;
    else this.className = cv;
  }

  function classedFunction() {
    (value.apply(this, arguments)
        ? classedAdd
        : classedRemove).call(this);
  }

  return this.each(typeof value === "function"
      ? classedFunction : value
      ? classedAdd
      : classedRemove);
}
d3_selectionPrototype.style = function(name, value, priority) {
  if (arguments.length < 3) priority = "";

  // If no value is specified, return the first value.
  if (arguments.length < 2) return window
      .getComputedStyle(this.node(), null)
      .getPropertyValue(name);

  function styleNull() {
    this.style.removeProperty(name);
  }

  function styleConstant() {
    this.style.setProperty(name, value, priority);
  }

  function styleFunction() {
    var x = value.apply(this, arguments);
    if (x == null) this.style.removeProperty(name);
    else this.style.setProperty(name, x, priority);
  }

  return this.each(value == null
      ? styleNull : (typeof value === "function"
      ? styleFunction : styleConstant));
};
d3_selectionPrototype.property = function(name, value) {

  // If no value is specified, return the first value.
  if (arguments.length < 2) return this.node()[name];

  function propertyNull() {
    delete this[name];
  }

  function propertyConstant() {
    this[name] = value;
  }

  function propertyFunction() {
    var x = value.apply(this, arguments);
    if (x == null) delete this[name];
    else this[name] = x;
  }

  return this.each(value == null
      ? propertyNull : (typeof value === "function"
      ? propertyFunction : propertyConstant));
};
d3_selectionPrototype.text = function(value) {
  return arguments.length < 1 ? this.node().textContent
      : (this.each(typeof value === "function"
      ? function() { this.textContent = value.apply(this, arguments); }
      : function() { this.textContent = value; }));
};
d3_selectionPrototype.html = function(value) {
  return arguments.length < 1 ? this.node().innerHTML
      : (this.each(typeof value === "function"
      ? function() { this.innerHTML = value.apply(this, arguments); }
      : function() { this.innerHTML = value; }));
};
// TODO append(node)?
// TODO append(function)?
d3_selectionPrototype.append = function(name) {
  name = d3.ns.qualify(name);

  function append() {
    return this.appendChild(document.createElement(name));
  }

  function appendNS() {
    return this.appendChild(document.createElementNS(name.space, name.local));
  }

  return this.select(name.local ? appendNS : append);
};
// TODO insert(node, function)?
// TODO insert(function, string)?
// TODO insert(function, function)?
d3_selectionPrototype.insert = function(name, before) {
  name = d3.ns.qualify(name);

  function insert() {
    return this.insertBefore(
        document.createElement(name),
        d3_select(before, this));
  }

  function insertNS() {
    return this.insertBefore(
        document.createElementNS(name.space, name.local),
        d3_select(before, this));
  }

  return this.select(name.local ? insertNS : insert);
};
// TODO remove(selector)?
// TODO remove(node)?
// TODO remove(function)?
d3_selectionPrototype.remove = function() {
  return this.each(function() {
    var parent = this.parentNode;
    if (parent) parent.removeChild(this);
  });
};
// TODO data(null) for clearing data?
d3_selectionPrototype.data = function(data, join) {
  var enter = [],
      update = [],
      exit = [];

  function bind(group, groupData) {
    var i,
        n = group.length,
        m = groupData.length,
        n0 = Math.min(n, m),
        n1 = Math.max(n, m),
        updateNodes = [],
        enterNodes = [],
        exitNodes = [],
        node,
        nodeData;

    if (join) {
      var nodeByKey = {},
          keys = [],
          key,
          j = groupData.length;

      for (i = -1; ++i < n;) {
        key = join.call(node = group[i], node.__data__, i);
        if (key in nodeByKey) {
          exitNodes[j++] = node; // duplicate key
        } else {
          nodeByKey[key] = node;
        }
        keys.push(key);
      }

      for (i = -1; ++i < m;) {
        node = nodeByKey[key = join.call(groupData, nodeData = groupData[i], i)];
        if (node) {
          node.__data__ = nodeData;
          updateNodes[i] = node;
          enterNodes[i] = exitNodes[i] = null;
        } else {
          enterNodes[i] = d3_selection_dataNode(nodeData);
          updateNodes[i] = exitNodes[i] = null;
        }
        delete nodeByKey[key];
      }

      for (i = -1; ++i < n;) {
        if (keys[i] in nodeByKey) {
          exitNodes[i] = group[i];
        }
      }
    } else {
      for (i = -1; ++i < n0;) {
        node = group[i];
        nodeData = groupData[i];
        if (node) {
          node.__data__ = nodeData;
          updateNodes[i] = node;
          enterNodes[i] = exitNodes[i] = null;
        } else {
          enterNodes[i] = d3_selection_dataNode(nodeData);
          updateNodes[i] = exitNodes[i] = null;
        }
      }
      for (; i < m; ++i) {
        enterNodes[i] = d3_selection_dataNode(groupData[i]);
        updateNodes[i] = exitNodes[i] = null;
      }
      for (; i < n1; ++i) {
        exitNodes[i] = group[i];
        enterNodes[i] = updateNodes[i] = null;
      }
    }

    enterNodes.update
        = updateNodes;

    enterNodes.parentNode
        = updateNodes.parentNode
        = exitNodes.parentNode
        = group.parentNode;

    enter.push(enterNodes);
    update.push(updateNodes);
    exit.push(exitNodes);
  }

  var i = -1,
      n = this.length,
      group;
  if (typeof data === "function") {
    while (++i < n) {
      bind(group = this[i], data.call(group, group.parentNode.__data__, i));
    }
  } else {
    while (++i < n) {
      bind(group = this[i], data);
    }
  }

  var selection = d3_selection(update);
  selection.enter = function() { return d3_selection_enter(enter); };
  selection.exit = function() { return d3_selection(exit); };
  return selection;
};

function d3_selection_dataNode(data) {
  return {__data__: data};
}
// TODO preserve null elements to maintain index?
d3_selectionPrototype.filter = function(filter) {
  var subgroups = [],
      subgroup,
      group,
      node;

  for (var j = 0, m = this.length; j < m; j++) {
    subgroups.push(subgroup = []);
    subgroup.parentNode = (group = this[j]).parentNode;
    for (var i = 0, n = group.length; i < n; i++) {
      if ((node = group[i]) && filter.call(node, node.__data__, i)) {
        subgroup.push(node);
      }
    }
  }

  return d3_selection(subgroups);
};
d3_selectionPrototype.map = function(map) {
  return this.each(function() {
    this.__data__ = map.apply(this, arguments);
  });
};
d3_selectionPrototype.sort = function(comparator) {
  comparator = d3_selection_sortComparator.apply(this, arguments);
  for (var j = 0, m = this.length; j < m; j++) {
    for (var group = this[j].sort(comparator), i = 1, n = group.length, prev = group[0]; i < n; i++) {
      var node = group[i];
      if (node) {
        if (prev) prev.parentNode.insertBefore(node, prev.nextSibling);
        prev = node;
      }
    }
  }
  return this;
};

function d3_selection_sortComparator(comparator) {
  if (!arguments.length) comparator = d3.ascending;
  return function(a, b) {
    return comparator(a && a.__data__, b && b.__data__);
  };
}
// type can be namespaced, e.g., "click.foo"
// listener can be null for removal
d3_selectionPrototype.on = function(type, listener, capture) {
  if (arguments.length < 3) capture = false;

  // parse the type specifier
  var name = "__on" + type, i = type.indexOf(".");
  if (i > 0) type = type.substring(0, i);

  // if called with only one argument, return the current listener
  if (arguments.length < 2) return (i = this.node()[name]) && i._;

  // remove the old event listener, and add the new event listener
  return this.each(function(d, i) {
    var node = this;

    if (node[name]) node.removeEventListener(type, node[name], capture);
    if (listener) node.addEventListener(type, node[name] = l, capture);

    // wrapped event listener that preserves i
    function l(e) {
      var o = d3.event; // Events can be reentrant (e.g., focus).
      d3.event = e;
      try {
        listener.call(node, node.__data__, i);
      } finally {
        d3.event = o;
      }
    }

    // stash the unwrapped listener for retrieval
    l._ = listener;
  });
};
d3_selectionPrototype.each = function(callback) {
  for (var j = -1, m = this.length; ++j < m;) {
    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
      var node = group[i];
      if (node) callback.call(node, node.__data__, i, j);
    }
  }
  return this;
};
//
// Note: assigning to the arguments array simultaneously changes the value of
// the corresponding argument!
//
// TODO The `this` argument probably shouldn't be the first argument to the
// callback, anyway, since it's redundant. However, that will require a major
// version bump due to backwards compatibility, so I'm not changing it right
// away.
//
d3_selectionPrototype.call = function(callback) {
  callback.apply(this, (arguments[0] = this, arguments));
  return this;
};
d3_selectionPrototype.empty = function() {
  return !this.node();
};
d3_selectionPrototype.node = function(callback) {
  for (var j = 0, m = this.length; j < m; j++) {
    for (var group = this[j], i = 0, n = group.length; i < n; i++) {
      var node = group[i];
      if (node) return node;
    }
  }
  return null;
};
d3_selectionPrototype.transition = function() {
  var subgroups = [],
      subgroup,
      node;

  for (var j = -1, m = this.length; ++j < m;) {
    subgroups.push(subgroup = []);
    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
      subgroup.push((node = group[i]) ? {node: node, delay: 0, duration: 250} : null);
    }
  }

  return d3_transition(subgroups, d3_transitionInheritId || ++d3_transitionId, Date.now());
};
var d3_selectionRoot = d3_selection([[document]]);

d3_selectionRoot[0].parentNode = document.documentElement;

// TODO fast singleton implementation!
// TODO select(function)
d3.select = function(selector) {
  return typeof selector === "string"
      ? d3_selectionRoot.select(selector)
      : d3_selection([[selector]]); // assume node
};

// TODO selectAll(function)
d3.selectAll = function(selector) {
  return typeof selector === "string"
      ? d3_selectionRoot.selectAll(selector)
      : d3_selection([d3_array(selector)]); // assume node[]
};
function d3_selection_enter(selection) {
  d3_arraySubclass(selection, d3_selection_enterPrototype);
  return selection;
}

var d3_selection_enterPrototype = [];

d3_selection_enterPrototype.append = d3_selectionPrototype.append;
d3_selection_enterPrototype.insert = d3_selectionPrototype.insert;
d3_selection_enterPrototype.empty = d3_selectionPrototype.empty;
d3_selection_enterPrototype.node = d3_selectionPrototype.node;
d3_selection_enterPrototype.select = function(selector) {
  var subgroups = [],
      subgroup,
      subnode,
      upgroup,
      group,
      node;

  for (var j = -1, m = this.length; ++j < m;) {
    upgroup = (group = this[j]).update;
    subgroups.push(subgroup = []);
    subgroup.parentNode = group.parentNode;
    for (var i = -1, n = group.length; ++i < n;) {
      if (node = group[i]) {
        subgroup.push(upgroup[i] = subnode = selector.call(group.parentNode, node.__data__, i));
        subnode.__data__ = node.__data__;
      } else {
        subgroup.push(null);
      }
    }
  }

  return d3_selection(subgroups);
};
function d3_transition(groups, id, time) {
  d3_arraySubclass(groups, d3_transitionPrototype);

  var tweens = {},
      event = d3.dispatch("start", "end"),
      ease = d3_transitionEase;

  groups.id = id;

  groups.time = time;

  groups.tween = function(name, tween) {
    if (arguments.length < 2) return tweens[name];
    if (tween == null) delete tweens[name];
    else tweens[name] = tween;
    return groups;
  };

  groups.ease = function(value) {
    if (!arguments.length) return ease;
    ease = typeof value === "function" ? value : d3.ease.apply(d3, arguments);
    return groups;
  };

  groups.each = function(type, listener) {
    if (arguments.length < 2) return d3_transition_each.call(groups, type);
    event[type].add(listener);
    return groups;
  };

  d3.timer(function(elapsed) {
    groups.each(function(d, i, j) {
      var tweened = [],
          node = this,
          delay = groups[j][i].delay,
          duration = groups[j][i].duration,
          lock = node.__transition__ || (node.__transition__ = {active: 0, count: 0});

      ++lock.count;

      delay <= elapsed ? start(elapsed) : d3.timer(start, delay, time);

      function start(elapsed) {
        if (lock.active > id) return stop();
        lock.active = id;

        for (var tween in tweens) {
          if (tween = tweens[tween].call(node, d, i)) {
            tweened.push(tween);
          }
        }

        event.start.dispatch.call(node, d, i);
        if (!tick(elapsed)) d3.timer(tick, 0, time);
        return 1;
      }

      function tick(elapsed) {
        if (lock.active !== id) return stop();

        var t = (elapsed - delay) / duration,
            e = ease(t),
            n = tweened.length;

        while (n > 0) {
          tweened[--n].call(node, e);
        }

        if (t >= 1) {
          stop();
          d3_transitionInheritId = id;
          event.end.dispatch.call(node, d, i);
          d3_transitionInheritId = 0;
          return 1;
        }
      }

      function stop() {
        if (!--lock.count) delete node.__transition__;
        return 1;
      }
    });
    return 1;
  }, 0, time);

  return groups;
}

var d3_transitionRemove = {};

function d3_transitionNull(d, i, a) {
  return a != "" && d3_transitionRemove;
}

function d3_transitionTween(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 = [],
    d3_transitionId = 0,
    d3_transitionInheritId = 0,
    d3_transitionEase = d3.ease("cubic-in-out");

d3_transitionPrototype.call = d3_selectionPrototype.call;

d3.transition = function() {
  return d3_selectionRoot.transition();
};

d3.transition.prototype = d3_transitionPrototype;
d3_transitionPrototype.select = function(selector) {
  var subgroups = [],
      subgroup,
      subnode,
      node;

  if (typeof selector !== "function") selector = d3_selection_selector(selector);

  for (var j = -1, m = this.length; ++j < m;) {
    subgroups.push(subgroup = []);
    for (var group = this[j], i = -1, n = group.length; ++i < n;) {
      if ((node = group[i]) && (subnode = selector.call(node.node, node.node.__data__, i))) {
        if ("__data__" in node.node) subnode.__data__ = node.node.__data__;
        subgroup.push({node: subnode, delay: node.delay, duration: node.duration});
      } else {
        subgroup.push(null);
      }
    }
  }

  return d3_transition(subgroups, this.id, this.time).ease(this.ease());
};
d3_transitionPrototype.selectAll = function(selector) {
  var subgroups = [],
      subgroup,
      subnodes,
      node;

  if (typeof selector !== "function") selector = d3_selection_selectorAll(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]) {
        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});
        }
      }
    }
  }

  return d3_transition(subgroups, this.id, this.time).ease(this.ease());
};
d3_transitionPrototype.attr = function(name, value) {
  return this.attrTween(name, d3_transitionTween(value));
};

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 === 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 === d3_transitionRemove
        ? (this.removeAttributeNS(name.space, name.local), null)
        : f && function(t) { this.setAttributeNS(name.space, name.local, f(t)); };
  }

  return this.tween("attr." + nameNS, name.local ? attrTweenNS : attrTween);
};
d3_transitionPrototype.style = function(name, value, priority) {
  if (arguments.length < 3) priority = "";
  return this.styleTween(name, d3_transitionTween(value), priority);
};

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 === d3_transitionRemove
        ? (this.style.removeProperty(name), null)
        : f && function(t) { this.style.setProperty(name, f(t), priority); };
  });
};
d3_transitionPrototype.text = function(value) {
  return this.tween("text", function(d, i) {
    this.textContent = typeof value === "function"
        ? value.call(this, d, i)
        : value;
  });
};
d3_transitionPrototype.remove = function() {
  return this.each("end", function() {
    var p;
    if (!this.__transition__ && (p = this.parentNode)) p.removeChild(this);
  });
};
d3_transitionPrototype.delay = function(value) {
  var groups = this;
  return groups.each(typeof value === "function"
      ? function(d, i, j) { groups[j][i].delay = +value.apply(this, arguments); }
      : (value = +value, function(d, i, j) { groups[j][i].delay = value; }));
};
d3_transitionPrototype.duration = function(value) {
  var groups = this;
  return groups.each(typeof value === "function"
      ? function(d, i, j) { groups[j][i].duration = +value.apply(this, arguments); }
      : (value = +value, function(d, i, j) { groups[j][i].duration = value; }));
};
function d3_transition_each(callback) {
  for (var j = 0, m = this.length; j < m; j++) {
    for (var group = this[j], i = 0, n = group.length; i < n; i++) {
      var node = group[i];
      if (node) callback.call(node = node.node, node.__data__, i, j);
    }
  }
  return this;
}
d3_transitionPrototype.transition = function() {
  return this.select(d3_this);
};
var d3_timer_queue = null,
    d3_timer_interval, // is an interval (or frame) active?
    d3_timer_timeout; // is a timeout active?

// The timer will continue to fire until callback returns true.
d3.timer = function(callback, delay, then) {
  var found = false,
      t0,
      t1 = d3_timer_queue;

  if (arguments.length < 3) {
    if (arguments.length < 2) delay = 0;
    else if (!isFinite(delay)) return;
    then = Date.now();
  }

  // See if the callback's already in the queue.
  while (t1) {
    if (t1.callback === callback) {
      t1.then = then;
      t1.delay = delay;
      found = true;
      break;
    }
    t0 = t1;
    t1 = t1.next;
  }

  // Otherwise, add the callback to the queue.
  if (!found) d3_timer_queue = {
    callback: callback,
    then: then,
    delay: delay,
    next: d3_timer_queue
  };

  // Start animatin'!
  if (!d3_timer_interval) {
    d3_timer_timeout = clearTimeout(d3_timer_timeout);
    d3_timer_interval = 1;
    d3_timer_frame(d3_timer_step);
  }
}

function d3_timer_step() {
  var elapsed,
      now = Date.now(),
      t1 = d3_timer_queue;

  while (t1) {
    elapsed = now - t1.then;
    if (elapsed >= t1.delay) t1.flush = t1.callback(elapsed);
    t1 = t1.next;
  }

  var delay = d3_timer_flush() - now;
  if (delay > 24) {
    if (isFinite(delay)) {
      clearTimeout(d3_timer_timeout);
      d3_timer_timeout = setTimeout(d3_timer_step, delay);
    }
    d3_timer_interval = 0;
  } else {
    d3_timer_interval = 1;
    d3_timer_frame(d3_timer_step);
  }
}

d3.timer.flush = function() {
  var elapsed,
      now = Date.now(),
      t1 = d3_timer_queue;

  while (t1) {
    elapsed = now - t1.then;
    if (!t1.delay) t1.flush = t1.callback(elapsed);
    t1 = t1.next;
  }

  d3_timer_flush();
};

// Flush after callbacks, to avoid concurrent queue modification.
function d3_timer_flush() {
  var t0 = null,
      t1 = d3_timer_queue,
      then = Infinity;
  while (t1) {
    if (t1.flush) {
      t1 = t0 ? t0.next = t1.next : d3_timer_queue = t1.next;
    } else {
      then = Math.min(then, t1.then + t1.delay);
      t1 = (t0 = t1).next;
    }
  }
  return then;
}

var d3_timer_frame = window.requestAnimationFrame
    || window.webkitRequestAnimationFrame
    || window.mozRequestAnimationFrame
    || window.oRequestAnimationFrame
    || window.msRequestAnimationFrame
    || function(callback) { setTimeout(callback, 17); };
function d3_noop() {}
d3.scale = {};

function d3_scaleExtent(domain) {
  var start = domain[0], stop = domain[domain.length - 1];
  return start < stop ? [start, stop] : [stop, start];
}
function d3_scale_nice(domain, nice) {
  var i0 = 0,
      i1 = domain.length - 1,
      x0 = domain[i0],
      x1 = domain[i1],
      dx;

  if (x1 < x0) {
    dx = i0; i0 = i1; i1 = dx;
    dx = x0; x0 = x1; x1 = dx;
  }

  if (dx = x1 - x0) {
    nice = nice(dx);
    domain[i0] = nice.floor(x0);
    domain[i1] = nice.ceil(x1);
  }

  return domain;
}

function d3_scale_niceDefault() {
  return Math;
}
d3.scale.linear = function() {
  return d3_scale_linear([0, 1], [0, 1], d3.interpolate, false);
};

function d3_scale_linear(domain, range, interpolate, clamp) {
  var output,
      input;

  function rescale() {
    var linear = domain.length == 2 ? d3_scale_bilinear : d3_scale_polylinear,
        uninterpolate = clamp ? d3_uninterpolateClamp : d3_uninterpolateNumber;
    output = linear(domain, range, uninterpolate, interpolate);
    input = linear(range, domain, uninterpolate, d3.interpolate);
    return scale;
  }

  function scale(x) {
    return output(x);
  }

  // Note: requires range is coercible to number!
  scale.invert = function(y) {
    return input(y);
  };

  scale.domain = function(x) {
    if (!arguments.length) return domain;
    domain = x.map(Number);
    return rescale();
  };

  scale.range = function(x) {
    if (!arguments.length) return range;
    range = x;
    return rescale();
  };

  scale.rangeRound = function(x) {
    return scale.range(x).interpolate(d3.interpolateRound);
  };

  scale.clamp = function(x) {
    if (!arguments.length) return clamp;
    clamp = x;
    return rescale();
  };

  scale.interpolate = function(x) {
    if (!arguments.length) return interpolate;
    interpolate = x;
    return rescale();
  };

  scale.ticks = function(m) {
    return d3_scale_linearTicks(domain, m);
  };

  scale.tickFormat = function(m) {
    return d3_scale_linearTickFormat(domain, m);
  };

  scale.nice = function() {
    d3_scale_nice(domain, d3_scale_linearNice);
    return rescale();
  };

  scale.copy = function() {
    return d3_scale_linear(domain, range, interpolate, clamp);
  };

  return rescale();
};

function d3_scale_linearRebind(scale, linear) {
  scale.range = d3.rebind(scale, linear.range);
  scale.rangeRound = d3.rebind(scale, linear.rangeRound);
  scale.interpolate = d3.rebind(scale, linear.interpolate);
  scale.clamp = d3.rebind(scale, linear.clamp);
  return scale;
}

function d3_scale_linearNice(dx) {
  dx = Math.pow(10, Math.round(Math.log(dx) / Math.LN10) - 1);
  return {
    floor: function(x) { return Math.floor(x / dx) * dx; },
    ceil: function(x) { return Math.ceil(x / dx) * dx; }
  };
}

// TODO Dates? Ugh.
function d3_scale_linearTickRange(domain, m) {
  var extent = d3_scaleExtent(domain),
      span = extent[1] - extent[0],
      step = Math.pow(10, Math.floor(Math.log(span / m) / Math.LN10)),
      err = m / span * step;

  // Filter ticks to get closer to the desired count.
  if (err <= .15) step *= 10;
  else if (err <= .35) step *= 5;
  else if (err <= .75) step *= 2;

  // Round start and stop values to step interval.
  extent[0] = Math.ceil(extent[0] / step) * step;
  extent[1] = Math.floor(extent[1] / step) * step + step * .5; // inclusive
  extent[2] = step;
  return extent;
}

function d3_scale_linearTicks(domain, m) {
  return d3.range.apply(d3, d3_scale_linearTickRange(domain, m));
}

function d3_scale_linearTickFormat(domain, m) {
  return d3.format(",." + Math.max(0, -Math.floor(Math.log(d3_scale_linearTickRange(domain, m)[2]) / Math.LN10 + .01)) + "f");
}
function d3_scale_bilinear(domain, range, uninterpolate, interpolate) {
  var u = uninterpolate(domain[0], domain[1]),
      i = interpolate(range[0], range[1]);
  return function(x) {
    return i(u(x));
  };
}
function d3_scale_polylinear(domain, range, uninterpolate, interpolate) {
  var u = [],
      i = [],
      j = 0,
      n = domain.length;

  while (++j < n) {
    u.push(uninterpolate(domain[j - 1], domain[j]));
    i.push(interpolate(range[j - 1], range[j]));
  }

  return function(x) {
    var j = d3.bisect(domain, x, 1, domain.length - 1) - 1;
    return i[j](u[j](x));
  };
}
d3.scale.log = function() {
  return d3_scale_log(d3.scale.linear(), d3_scale_logp);
};

function d3_scale_log(linear, log) {
  var pow = log.pow;

  function scale(x) {
    return linear(log(x));
  }

  scale.invert = function(x) {
    return pow(linear.invert(x));
  };

  scale.domain = function(x) {
    if (!arguments.length) return linear.domain().map(pow);
    log = x[0] < 0 ? d3_scale_logn : d3_scale_logp;
    pow = log.pow;
    linear.domain(x.map(log));
    return scale;
  };

  scale.nice = function() {
    linear.domain(d3_scale_nice(linear.domain(), d3_scale_niceDefault));
    return scale;
  };

  scale.ticks = function() {
    var extent = d3_scaleExtent(linear.domain()),
        ticks = [];
    if (extent.every(isFinite)) {
      var i = Math.floor(extent[0]),
          j = Math.ceil(extent[1]),
          u = Math.round(pow(extent[0])),
          v = Math.round(pow(extent[1]));
      if (log === d3_scale_logn) {
        ticks.push(pow(i));
        for (; i++ < j;) for (var k = 9; k > 0; k--) ticks.push(pow(i) * k);
      } else {
        for (; i < j; i++) for (var k = 1; k < 10; k++) ticks.push(pow(i) * k);
        ticks.push(pow(i));
      }
      for (i = 0; ticks[i] < u; i++) {} // strip small values
      for (j = ticks.length; ticks[j - 1] > v; j--) {} // strip big values
      ticks = ticks.slice(i, j);
    }
    return ticks;
  };

  scale.tickFormat = function(n, format) {
    if (arguments.length < 2) format = d3_scale_logFormat;
    if (arguments.length < 1) return format;
    var k = n / scale.ticks().length,
        f = log === d3_scale_logn ? (e = -1e-15, Math.floor) : (e = 1e-15, Math.ceil),
        e;
    return function(d) {
      return d / pow(f(log(d) + e)) < k ? format(d) : "";
    };
  };

  scale.copy = function() {
    return d3_scale_log(linear.copy(), log);
  };

  return d3_scale_linearRebind(scale, linear);
};

var d3_scale_logFormat = d3.format("e");

function d3_scale_logp(x) {
  return Math.log(x) / Math.LN10;
}

function d3_scale_logn(x) {
  return -Math.log(-x) / Math.LN10;
}

d3_scale_logp.pow = function(x) {
  return Math.pow(10, x);
};

d3_scale_logn.pow = function(x) {
  return -Math.pow(10, -x);
};
d3.scale.pow = function() {
  return d3_scale_pow(d3.scale.linear(), 1);
};

function d3_scale_pow(linear, exponent) {
  var powp = d3_scale_powPow(exponent),
      powb = d3_scale_powPow(1 / exponent);

  function scale(x) {
    return linear(powp(x));
  }

  scale.invert = function(x) {
    return powb(linear.invert(x));
  };

  scale.domain = function(x) {
    if (!arguments.length) return linear.domain().map(powb);
    linear.domain(x.map(powp));
    return scale;
  };

  scale.ticks = function(m) {
    return d3_scale_linearTicks(scale.domain(), m);
  };

  scale.tickFormat = function(m) {
    return d3_scale_linearTickFormat(scale.domain(), m);
  };

  scale.nice = function() {
    return scale.domain(d3_scale_nice(scale.domain(), d3_scale_linearNice));
  };

  scale.exponent = function(x) {
    if (!arguments.length) return exponent;
    var domain = scale.domain();
    powp = d3_scale_powPow(exponent = x);
    powb = d3_scale_powPow(1 / exponent);
    return scale.domain(domain);
  };

  scale.copy = function() {
    return d3_scale_pow(linear.copy(), exponent);
  };

  return d3_scale_linearRebind(scale, linear);
};

function d3_scale_powPow(e) {
  return function(x) {
    return x < 0 ? -Math.pow(-x, e) : Math.pow(x, e);
  };
}
d3.scale.sqrt = function() {
  return d3.scale.pow().exponent(.5);
};
d3.scale.ordinal = function() {
  return d3_scale_ordinal([], {t: "range", x: []});
};

function d3_scale_ordinal(domain, ranger) {
  var index,
      range,
      rangeBand;

  function scale(x) {
    return range[((index[x] || (index[x] = domain.push(x))) - 1) % range.length];
  }

  scale.domain = function(x) {
    if (!arguments.length) return domain;
    domain = [];
    index = {};
    var i = -1, n = x.length, xi;
    while (++i < n) if (!index[xi = x[i]]) index[xi] = domain.push(xi);
    return scale[ranger.t](ranger.x, ranger.p);
  };

  scale.range = function(x) {
    if (!arguments.length) return range;
    range = x;
    rangeBand = 0;
    ranger = {t: "range", x: x};
    return scale;
  };

  scale.rangePoints = function(x, padding) {
    if (arguments.length < 2) padding = 0;
    var start = x[0],
        stop = x[1],
        step = (stop - start) / (domain.length - 1 + padding);
    range = domain.length < 2 ? [(start + stop) / 2] : d3.range(start + step * padding / 2, stop + step / 2, step);
    rangeBand = 0;
    ranger = {t: "rangePoints", x: x, p: padding};
    return scale;
  };

  scale.rangeBands = function(x, padding) {
    if (arguments.length < 2) padding = 0;
    var start = x[0],
        stop = x[1],
        step = (stop - start) / (domain.length + padding);
    range = d3.range(start + step * padding, stop, step);
    rangeBand = step * (1 - padding);
    ranger = {t: "rangeBands", x: x, p: padding};
    return scale;
  };

  scale.rangeRoundBands = function(x, padding) {
    if (arguments.length < 2) padding = 0;
    var start = x[0],
        stop = x[1],
        step = Math.floor((stop - start) / (domain.length + padding)),
        err = stop - start - (domain.length - padding) * step;
    range = d3.range(start + Math.round(err / 2), stop, step);
    rangeBand = Math.round(step * (1 - padding));
    ranger = {t: "rangeRoundBands", x: x, p: padding};
    return scale;
  };

  scale.rangeBand = function() {
    return rangeBand;
  };

  scale.copy = function() {
    return d3_scale_ordinal(domain, ranger);
  };

  return scale.domain(domain);
};
/*
 * This product includes color specifications and designs developed by Cynthia
 * Brewer (http://colorbrewer.org/). See lib/colorbrewer for more information.
 */

d3.scale.category10 = function() {
  return d3.scale.ordinal().range(d3_category10);
};

d3.scale.category20 = function() {
  return d3.scale.ordinal().range(d3_category20);
};

d3.scale.category20b = function() {
  return d3.scale.ordinal().range(d3_category20b);
};

d3.scale.category20c = function() {
  return d3.scale.ordinal().range(d3_category20c);
};

var d3_category10 = [
  "#1f77b4", "#ff7f0e", "#2ca02c", "#d62728", "#9467bd",
  "#8c564b", "#e377c2", "#7f7f7f", "#bcbd22", "#17becf"
];

var d3_category20 = [
  "#1f77b4", "#aec7e8",
  "#ff7f0e", "#ffbb78",
  "#2ca02c", "#98df8a",
  "#d62728", "#ff9896",
  "#9467bd", "#c5b0d5",
  "#8c564b", "#c49c94",
  "#e377c2", "#f7b6d2",
  "#7f7f7f", "#c7c7c7",
  "#bcbd22", "#dbdb8d",
  "#17becf", "#9edae5"
];

var d3_category20b = [
  "#393b79", "#5254a3", "#6b6ecf", "#9c9ede",
  "#637939", "#8ca252", "#b5cf6b", "#cedb9c",
  "#8c6d31", "#bd9e39", "#e7ba52", "#e7cb94",
  "#843c39", "#ad494a", "#d6616b", "#e7969c",
  "#7b4173", "#a55194", "#ce6dbd", "#de9ed6"
];

var d3_category20c = [
  "#3182bd", "#6baed6", "#9ecae1", "#c6dbef",
  "#e6550d", "#fd8d3c", "#fdae6b", "#fdd0a2",
  "#31a354", "#74c476", "#a1d99b", "#c7e9c0",
  "#756bb1", "#9e9ac8", "#bcbddc", "#dadaeb",
  "#636363", "#969696", "#bdbdbd", "#d9d9d9"
];
d3.scale.quantile = function() {
  return d3_scale_quantile([], []);
};

function d3_scale_quantile(domain, range) {
  var thresholds;

  function rescale() {
    var k = 0,
        n = domain.length,
        q = range.length;
    thresholds = [];
    while (++k < q) thresholds[k - 1] = d3.quantile(domain, k / q);
    return scale;
  }

  function scale(x) {
    if (isNaN(x = +x)) return NaN;
    return range[d3.bisect(thresholds, x)];
  }

  scale.domain = function(x) {
    if (!arguments.length) return domain;
    domain = x.filter(function(d) { return !isNaN(d); }).sort(d3.ascending);
    return rescale();
  };

  scale.range = function(x) {
    if (!arguments.length) return range;
    range = x;
    return rescale();
  };

  scale.quantiles = function() {
    return thresholds;
  };

  scale.copy = function() {
    return d3_scale_quantile(domain, range); // copy on write!
  };

  return rescale();
};
d3.scale.quantize = function() {
  return d3_scale_quantize(0, 1, [0, 1]);
};

function d3_scale_quantize(x0, x1, range) {
  var kx, i;

  function scale(x) {
    return range[Math.max(0, Math.min(i, Math.floor(kx * (x - x0))))];
  }

  function rescale() {
    kx = range.length / (x1 - x0);
    i = range.length - 1;
    return scale;
  }

  scale.domain = function(x) {
    if (!arguments.length) return [x0, x1];
    x0 = +x[0];
    x1 = +x[x.length - 1];
    return rescale();
  };

  scale.range = function(x) {
    if (!arguments.length) return range;
    range = x;
    return rescale();
  };

  scale.copy = function() {
    return d3_scale_quantize(x0, x1, range); // copy on write
  };

  return rescale();
};
d3.svg = {};
d3.svg.arc = function() {
  var innerRadius = d3_svg_arcInnerRadius,
      outerRadius = d3_svg_arcOuterRadius,
      startAngle = d3_svg_arcStartAngle,
      endAngle = d3_svg_arcEndAngle;

  function arc() {
    var r0 = innerRadius.apply(this, arguments),
        r1 = outerRadius.apply(this, arguments),
        a0 = startAngle.apply(this, arguments) + d3_svg_arcOffset,
        a1 = endAngle.apply(this, arguments) + d3_svg_arcOffset,
        da = (a1 < a0 && (da = a0, a0 = a1, a1 = da), a1 - a0),
        df = da < Math.PI ? "0" : "1",
        c0 = Math.cos(a0),
        s0 = Math.sin(a0),
        c1 = Math.cos(a1),
        s1 = Math.sin(a1);
    return da >= d3_svg_arcMax
      ? (r0
      ? "M0," + r1
      + "A" + r1 + "," + r1 + " 0 1,1 0," + (-r1)
      + "A" + r1 + "," + r1 + " 0 1,1 0," + r1
      + "M0," + r0
      + "A" + r0 + "," + r0 + " 0 1,0 0," + (-r0)
      + "A" + r0 + "," + r0 + " 0 1,0 0," + r0
      + "Z"
      : "M0," + r1
      + "A" + r1 + "," + r1 + " 0 1,1 0," + (-r1)
      + "A" + r1 + "," + r1 + " 0 1,1 0," + r1
      + "Z")
      : (r0
      ? "M" + r1 * c0 + "," + r1 * s0
      + "A" + r1 + "," + r1 + " 0 " + df + ",1 " + r1 * c1 + "," + r1 * s1
      + "L" + r0 * c1 + "," + r0 * s1
      + "A" + r0 + "," + r0 + " 0 " + df + ",0 " + r0 * c0 + "," + r0 * s0
      + "Z"
      : "M" + r1 * c0 + "," + r1 * s0
      + "A" + r1 + "," + r1 + " 0 " + df + ",1 " + r1 * c1 + "," + r1 * s1
      + "L0,0"
      + "Z");
  }

  arc.innerRadius = function(v) {
    if (!arguments.length) return innerRadius;
    innerRadius = d3.functor(v);
    return arc;
  };

  arc.outerRadius = function(v) {
    if (!arguments.length) return outerRadius;
    outerRadius = d3.functor(v);
    return arc;
  };

  arc.startAngle = function(v) {
    if (!arguments.length) return startAngle;
    startAngle = d3.functor(v);
    return arc;
  };

  arc.endAngle = function(v) {
    if (!arguments.length) return endAngle;
    endAngle = d3.functor(v);
    return arc;
  };

  arc.centroid = function() {
    var r = (innerRadius.apply(this, arguments)
        + outerRadius.apply(this, arguments)) / 2,
        a = (startAngle.apply(this, arguments)
        + endAngle.apply(this, arguments)) / 2 + d3_svg_arcOffset;
    return [Math.cos(a) * r, Math.sin(a) * r];
  };

  return arc;
};

var d3_svg_arcOffset = -Math.PI / 2,
    d3_svg_arcMax = 2 * Math.PI - 1e-6;

function d3_svg_arcInnerRadius(d) {
  return d.innerRadius;
}

function d3_svg_arcOuterRadius(d) {
  return d.outerRadius;
}

function d3_svg_arcStartAngle(d) {
  return d.startAngle;
}

function d3_svg_arcEndAngle(d) {
  return d.endAngle;
}
function d3_svg_line(projection) {
  var x = d3_svg_lineX,
      y = d3_svg_lineY,
      interpolate = "linear",
      interpolator = d3_svg_lineInterpolators[interpolate],
      tension = .7;

  function line(d) {
    return d.length < 1 ? null : "M" + interpolator(projection(d3_svg_linePoints(this, d, x, y)), tension);
  }

  line.x = function(v) {
    if (!arguments.length) return x;
    x = v;
    return line;
  };

  line.y = function(v) {
    if (!arguments.length) return y;
    y = v;
    return line;
  };

  line.interpolate = function(v) {
    if (!arguments.length) return interpolate;
    interpolator = d3_svg_lineInterpolators[interpolate = v];
    return line;
  };

  line.tension = function(v) {
    if (!arguments.length) return tension;
    tension = v;
    return line;
  };

  return line;
}

d3.svg.line = function() {
  return d3_svg_line(Object);
};

// Converts the specified array of data into an array of points
// (x-y tuples), by evaluating the specified `x` and `y` functions on each
// data point. The `this` context of the evaluated functions is the specified
// "self" object; each function is passed the current datum and index.
function d3_svg_linePoints(self, d, x, y) {
  var points = [],
      i = -1,
      n = d.length,
      fx = typeof x === "function",
      fy = typeof y === "function",
      value;
  if (fx && fy) {
    while (++i < n) points.push([
      x.call(self, value = d[i], i),
      y.call(self, value, i)
    ]);
  } else if (fx) {
    while (++i < n) points.push([x.call(self, d[i], i), y]);
  } else if (fy) {
    while (++i < n) points.push([x, y.call(self, d[i], i)]);
  } else {
    while (++i < n) points.push([x, y]);
  }
  return points;
}

// The default `x` property, which references d[0].
function d3_svg_lineX(d) {
  return d[0];
}

// The default `y` property, which references d[1].
function d3_svg_lineY(d) {
  return d[1];
}

// The various interpolators supported by the `line` class.
var d3_svg_lineInterpolators = {
  "linear": d3_svg_lineLinear,
  "step-before": d3_svg_lineStepBefore,
  "step-after": d3_svg_lineStepAfter,
  "basis": d3_svg_lineBasis,
  "basis-open": d3_svg_lineBasisOpen,
  "basis-closed": d3_svg_lineBasisClosed,
  "bundle": d3_svg_lineBundle,
  "cardinal": d3_svg_lineCardinal,
  "cardinal-open": d3_svg_lineCardinalOpen,
  "cardinal-closed": d3_svg_lineCardinalClosed,
  "monotone": d3_svg_lineMonotone
};

// Linear interpolation; generates "L" commands.
function d3_svg_lineLinear(points) {
  var i = 0,
      n = points.length,
      p = points[0],
      path = [p[0], ",", p[1]];
  while (++i < n) path.push("L", (p = points[i])[0], ",", p[1]);
  return path.join("");
}

// Step interpolation; generates "H" and "V" commands.
function d3_svg_lineStepBefore(points) {
  var i = 0,
      n = points.length,
      p = points[0],
      path = [p[0], ",", p[1]];
  while (++i < n) path.push("V", (p = points[i])[1], "H", p[0]);
  return path.join("");
}

// Step interpolation; generates "H" and "V" commands.
function d3_svg_lineStepAfter(points) {
  var i = 0,
      n = points.length,
      p = points[0],
      path = [p[0], ",", p[1]];
  while (++i < n) path.push("H", (p = points[i])[0], "V", p[1]);
  return path.join("");
}

// Open cardinal spline interpolation; generates "C" commands.
function d3_svg_lineCardinalOpen(points, tension) {
  return points.length < 4
      ? d3_svg_lineLinear(points)
      : points[1] + d3_svg_lineHermite(points.slice(1, points.length - 1),
        d3_svg_lineCardinalTangents(points, tension));
}

// Closed cardinal spline interpolation; generates "C" commands.
function d3_svg_lineCardinalClosed(points, tension) {
  return points.length < 3
      ? d3_svg_lineLinear(points)
      : points[0] + d3_svg_lineHermite((points.push(points[0]), points),
        d3_svg_lineCardinalTangents([points[points.length - 2]]
        .concat(points, [points[1]]), tension));
}

// Cardinal spline interpolation; generates "C" commands.
function d3_svg_lineCardinal(points, tension, closed) {
  return points.length < 3
      ? d3_svg_lineLinear(points)
      : points[0] + d3_svg_lineHermite(points,
        d3_svg_lineCardinalTangents(points, tension));
}

// Hermite spline construction; generates "C" commands.
function d3_svg_lineHermite(points, tangents) {
  if (tangents.length < 1
      || (points.length != tangents.length
      && points.length != tangents.length + 2)) {
    return d3_svg_lineLinear(points);
  }

  var quad = points.length != tangents.length,
      path = "",
      p0 = points[0],
      p = points[1],
      t0 = tangents[0],
      t = t0,
      pi = 1;

  if (quad) {
    path += "Q" + (p[0] - t0[0] * 2 / 3) + "," + (p[1] - t0[1] * 2 / 3)
        + "," + p[0] + "," + p[1];
    p0 = points[1];
    pi = 2;
  }

  if (tangents.length > 1) {
    t = tangents[1];
    p = points[pi];
    pi++;
    path += "C" + (p0[0] + t0[0]) + "," + (p0[1] + t0[1])
        + "," + (p[0] - t[0]) + "," + (p[1] - t[1])
        + "," + p[0] + "," + p[1];
    for (var i = 2; i < tangents.length; i++, pi++) {
      p = points[pi];
      t = tangents[i];
      path += "S" + (p[0] - t[0]) + "," + (p[1] - t[1])
          + "," + p[0] + "," + p[1];
    }
  }

  if (quad) {
    var lp = points[pi];
    path += "Q" + (p[0] + t[0] * 2 / 3) + "," + (p[1] + t[1] * 2 / 3)
        + "," + lp[0] + "," + lp[1];
  }

  return path;
}

// Generates tangents for a cardinal spline.
function d3_svg_lineCardinalTangents(points, tension) {
  var tangents = [],
      a = (1 - tension) / 2,
      p0,
      p1 = points[0],
      p2 = points[1],
      i = 1,
      n = points.length;
  while (++i < n) {
    p0 = p1;
    p1 = p2;
    p2 = points[i];
    tangents.push([a * (p2[0] - p0[0]), a * (p2[1] - p0[1])]);
  }
  return tangents;
}

// B-spline interpolation; generates "C" commands.
function d3_svg_lineBasis(points) {
  if (points.length < 3) return d3_svg_lineLinear(points);
  var i = 1,
      n = points.length,
      pi = points[0],
      x0 = pi[0],
      y0 = pi[1],
      px = [x0, x0, x0, (pi = points[1])[0]],
      py = [y0, y0, y0, pi[1]],
      path = [x0, ",", y0];
  d3_svg_lineBasisBezier(path, px, py);
  while (++i < n) {
    pi = points[i];
    px.shift(); px.push(pi[0]);
    py.shift(); py.push(pi[1]);
    d3_svg_lineBasisBezier(path, px, py);
  }
  i = -1;
  while (++i < 2) {
    px.shift(); px.push(pi[0]);
    py.shift(); py.push(pi[1]);
    d3_svg_lineBasisBezier(path, px, py);
  }
  return path.join("");
}

// Open B-spline interpolation; generates "C" commands.
function d3_svg_lineBasisOpen(points) {
  if (points.length < 4) return d3_svg_lineLinear(points);
  var path = [],
      i = -1,
      n = points.length,
      pi,
      px = [0],
      py = [0];
  while (++i < 3) {
    pi = points[i];
    px.push(pi[0]);
    py.push(pi[1]);
  }
  path.push(d3_svg_lineDot4(d3_svg_lineBasisBezier3, px)
    + "," + d3_svg_lineDot4(d3_svg_lineBasisBezier3, py));
  --i; while (++i < n) {
    pi = points[i];
    px.shift(); px.push(pi[0]);
    py.shift(); py.push(pi[1]);
    d3_svg_lineBasisBezier(path, px, py);
  }
  return path.join("");
}

// Closed B-spline interpolation; generates "C" commands.
function d3_svg_lineBasisClosed(points) {
  var path,
      i = -1,
      n = points.length,
      m = n + 4,
      pi,
      px = [],
      py = [];
  while (++i < 4) {
    pi = points[i % n];
    px.push(pi[0]);
    py.push(pi[1]);
  }
  path = [
    d3_svg_lineDot4(d3_svg_lineBasisBezier3, px), ",",
    d3_svg_lineDot4(d3_svg_lineBasisBezier3, py)
  ];
  --i; while (++i < m) {
    pi = points[i % n];
    px.shift(); px.push(pi[0]);
    py.shift(); py.push(pi[1]);
    d3_svg_lineBasisBezier(path, px, py);
  }
  return path.join("");
}

function d3_svg_lineBundle(points, tension) {
  var n = points.length - 1,
      x0 = points[0][0],
      y0 = points[0][1],
      dx = points[n][0] - x0,
      dy = points[n][1] - y0,
      i = -1,
      p,
      t;
  while (++i <= n) {
    p = points[i];
    t = i / n;
    p[0] = tension * p[0] + (1 - tension) * (x0 + t * dx);
    p[1] = tension * p[1] + (1 - tension) * (y0 + t * dy);
  }
  return d3_svg_lineBasis(points);
}

// Returns the dot product of the given four-element vectors.
function d3_svg_lineDot4(a, b) {
  return a[0] * b[0] + a[1] * b[1] + a[2] * b[2] + a[3] * b[3];
}

// Matrix to transform basis (b-spline) control points to bezier
// control points. Derived from FvD 11.2.8.
var d3_svg_lineBasisBezier1 = [0, 2/3, 1/3, 0],
    d3_svg_lineBasisBezier2 = [0, 1/3, 2/3, 0],
    d3_svg_lineBasisBezier3 = [0, 1/6, 2/3, 1/6];

// Pushes a "C" Bézier curve onto the specified path array, given the
// two specified four-element arrays which define the control points.
function d3_svg_lineBasisBezier(path, x, y) {
  path.push(
      "C", d3_svg_lineDot4(d3_svg_lineBasisBezier1, x),
      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier1, y),
      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier2, x),
      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier2, y),
      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier3, x),
      ",", d3_svg_lineDot4(d3_svg_lineBasisBezier3, y));
}

// Computes the slope from points p0 to p1.
function d3_svg_lineSlope(p0, p1) {
  return (p1[1] - p0[1]) / (p1[0] - p0[0]);
}

// Compute three-point differences for the given points.
// http://en.wikipedia.org/wiki/Cubic_Hermite_spline#Finite_difference
function d3_svg_lineFiniteDifferences(points) {
  var i = 0,
      j = points.length - 1,
      m = [],
      p0 = points[0],
      p1 = points[1],
      d = m[0] = d3_svg_lineSlope(p0, p1);
  while (++i < j) {
    m[i] = d + (d = d3_svg_lineSlope(p0 = p1, p1 = points[i + 1]));
  }
  m[i] = d;
  return m;
}

// Interpolates the given points using Fritsch-Carlson Monotone cubic Hermite
// interpolation. Returns an array of tangent vectors. For details, see
// http://en.wikipedia.org/wiki/Monotone_cubic_interpolation
function d3_svg_lineMonotoneTangents(points) {
  var tangents = [],
      d,
      a,
      b,
      s,
      m = d3_svg_lineFiniteDifferences(points),
      i = -1,
      j = points.length - 1;

  // The first two steps are done by computing finite-differences:
  // 1. Compute the slopes of the secant lines between successive points.
  // 2. Initialize the tangents at every point as the average of the secants.

  // Then, for each segment…
  while (++i < j) {
    d = d3_svg_lineSlope(points[i], points[i + 1]);

    // 3. If two successive yk = y{k + 1} are equal (i.e., d is zero), then set
    // mk = m{k + 1} = 0 as the spline connecting these points must be flat to
    // preserve monotonicity. Ignore step 4 and 5 for those k.

    if (Math.abs(d) < 1e-6) {
      m[i] = m[i + 1] = 0;
    } else {
      // 4. Let ak = mk / dk and bk = m{k + 1} / dk.
      a = m[i] / d;
      b = m[i + 1] / d;

      // 5. Prevent overshoot and ensure monotonicity by restricting the
      // magnitude of vector <ak, bk> to a circle of radius 3.
      s = a * a + b * b;
      if (s > 9) {
        s = d * 3 / Math.sqrt(s);
        m[i] = s * a;
        m[i + 1] = s * b;
      }
    }
  }

  // Compute the normalized tangent vector from the slopes. Note that if x is
  // not monotonic, it's possible that the slope will be infinite, so we protect
  // against NaN by setting the coordinate to zero.
  i = -1; while (++i <= j) {
    s = (points[Math.min(j, i + 1)][0] - points[Math.max(0, i - 1)][0])
      / (6 * (1 + m[i] * m[i]));
    tangents.push([s || 0, m[i] * s || 0]);
  }

  return tangents;
}

function d3_svg_lineMonotone(points) {
  return points.length < 3
      ? d3_svg_lineLinear(points)
      : points[0] +
        d3_svg_lineHermite(points, d3_svg_lineMonotoneTangents(points));
}
d3.svg.line.radial = function() {
  var line = d3_svg_line(d3_svg_lineRadial);
  line.radius = line.x, delete line.x;
  line.angle = line.y, delete line.y;
  return line;
};

function d3_svg_lineRadial(points) {
  var point,
      i = -1,
      n = points.length,
      r,
      a;
  while (++i < n) {
    point = points[i];
    r = point[0];
    a = point[1] + d3_svg_arcOffset;
    point[0] = r * Math.cos(a);
    point[1] = r * Math.sin(a);
  }
  return points;
}
function d3_svg_area(projection) {
  var x0 = d3_svg_lineX,
      x1 = d3_svg_lineX,
      y0 = 0,
      y1 = d3_svg_lineY,
      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" + i0(projection(points1), tension)
         + "L" + i1(projection(points0.reverse()), tension)
         + "Z";
  }

  area.x = function(x) {
    if (!arguments.length) return x1;
    x0 = x1 = x;
    return area;
  };

  area.x0 = function(x) {
    if (!arguments.length) return x0;
    x0 = x;
    return area;
  };

  area.x1 = function(x) {
    if (!arguments.length) return x1;
    x1 = x;
    return area;
  };

  area.y = function(y) {
    if (!arguments.length) return y1;
    y0 = y1 = y;
    return area;
  };

  area.y0 = function(y) {
    if (!arguments.length) return y0;
    y0 = y;
    return area;
  };

  area.y1 = function(y) {
    if (!arguments.length) return y1;
    y1 = y;
    return area;
  };

  area.interpolate = function(x) {
    if (!arguments.length) return interpolate;
    i0 = d3_svg_lineInterpolators[interpolate = x];
    i1 = i0.reverse || i0;
    return area;
  };

  area.tension = function(x) {
    if (!arguments.length) return tension;
    tension = x;
    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);
};

function d3_svg_areaX(points) {
  return function(d, i) {
    return points[i][0];
  };
}

function d3_svg_areaY(points) {
  return function(d, i) {
    return points[i][1];
  };
}
d3.svg.area.radial = function() {
  var area = d3_svg_area(d3_svg_lineRadial);
  area.radius = area.x, delete area.x;
  area.innerRadius = area.x0, delete area.x0;
  area.outerRadius = area.x1, delete area.x1;
  area.angle = area.y, delete area.y;
  area.startAngle = area.y0, delete area.y0;
  area.endAngle = area.y1, delete area.y1;
  return area;
};
d3.svg.chord = function() {
  var source = d3_svg_chordSource,
      target = d3_svg_chordTarget,
      radius = d3_svg_chordRadius,
      startAngle = d3_svg_arcStartAngle,
      endAngle = d3_svg_arcEndAngle;

  // TODO Allow control point to be customized.

  function chord(d, i) {
    var s = subgroup(this, source, d, i),
        t = subgroup(this, target, d, i);
    return "M" + s.p0
      + arc(s.r, s.p1) + (equals(s, t)
      ? curve(s.r, s.p1, s.r, s.p0)
      : curve(s.r, s.p1, t.r, t.p0)
      + arc(t.r, t.p1)
      + curve(t.r, t.p1, s.r, s.p0))
      + "Z";
  }

  function subgroup(self, f, d, i) {
    var subgroup = f.call(self, d, i),
        r = radius.call(self, subgroup, i),
        a0 = startAngle.call(self, subgroup, i) + d3_svg_arcOffset,
        a1 = endAngle.call(self, subgroup, i) + d3_svg_arcOffset;
    return {
      r: r,
      a0: a0,
      a1: a1,
      p0: [r * Math.cos(a0), r * Math.sin(a0)],
      p1: [r * Math.cos(a1), r * Math.sin(a1)]
    };
  }

  function equals(a, b) {
    return a.a0 == b.a0 && a.a1 == b.a1;
  }

  function arc(r, p) {
    return "A" + r + "," + r + " 0 0,1 " + p;
  }

  function curve(r0, p0, r1, p1) {
    return "Q 0,0 " + p1;
  }

  chord.radius = function(v) {
    if (!arguments.length) return radius;
    radius = d3.functor(v);
    return chord;
  };

  chord.source = function(v) {
    if (!arguments.length) return source;
    source = d3.functor(v);
    return chord;
  };

  chord.target = function(v) {
    if (!arguments.length) return target;
    target = d3.functor(v);
    return chord;
  };

  chord.startAngle = function(v) {
    if (!arguments.length) return startAngle;
    startAngle = d3.functor(v);
    return chord;
  };

  chord.endAngle = function(v) {
    if (!arguments.length) return endAngle;
    endAngle = d3.functor(v);
    return chord;
  };

  return chord;
};

function d3_svg_chordSource(d) {
  return d.source;
}

function d3_svg_chordTarget(d) {
  return d.target;
}

function d3_svg_chordRadius(d) {
  return d.radius;
}

function d3_svg_chordStartAngle(d) {
  return d.startAngle;
}

function d3_svg_chordEndAngle(d) {
  return d.endAngle;
}
d3.svg.diagonal = function() {
  var source = d3_svg_chordSource,
      target = d3_svg_chordTarget,
      projection = d3_svg_diagonalProjection;

  function diagonal(d, i) {
    var p0 = source.call(this, d, i),
        p3 = target.call(this, d, i),
        m = (p0.y + p3.y) / 2,
        p = [p0, {x: p0.x, y: m}, {x: p3.x, y: m}, p3];
    p = p.map(projection);
    return "M" + p[0] + "C" + p[1] + " " + p[2] + " " + p[3];
  }

  diagonal.source = function(x) {
    if (!arguments.length) return source;
    source = d3.functor(x);
    return diagonal;
  };

  diagonal.target = function(x) {
    if (!arguments.length) return target;
    target = d3.functor(x);
    return diagonal;
  };

  diagonal.projection = function(x) {
    if (!arguments.length) return projection;
    projection = x;
    return diagonal;
  };

  return diagonal;
};

function d3_svg_diagonalProjection(d) {
  return [d.x, d.y];
}
d3.svg.diagonal.radial = function() {
  var diagonal = d3.svg.diagonal(),
      projection = d3_svg_diagonalProjection,
      projection_ = diagonal.projection;

  diagonal.projection = function(x) {
    return arguments.length
        ? projection_(d3_svg_diagonalRadialProjection(projection = x))
        : projection;
  };

  return diagonal;
};

function d3_svg_diagonalRadialProjection(projection) {
  return function() {
    var d = projection.apply(this, arguments),
        r = d[0],
        a = d[1] + d3_svg_arcOffset;
    return [r * Math.cos(a), r * Math.sin(a)];
  };
}
d3.svg.mouse = function(container) {
  return d3_svg_mousePoint(container, d3.event);
};

// https://bugs.webkit.org/show_bug.cgi?id=44083
var d3_mouse_bug44083 = /WebKit/.test(navigator.userAgent) ? -1 : 0;

function d3_svg_mousePoint(container, e) {
  var point = (container.ownerSVGElement || container).createSVGPoint();
  if ((d3_mouse_bug44083 < 0) && (window.scrollX || window.scrollY)) {
    var svg = d3.select(document.body)
      .append("svg:svg")
        .style("position", "absolute")
        .style("top", 0)
        .style("left", 0);
    var ctm = svg[0][0].getScreenCTM();
    d3_mouse_bug44083 = !(ctm.f || ctm.e);
    svg.remove();
  }
  if (d3_mouse_bug44083) {
    point.x = e.pageX;
    point.y = e.pageY;
  } else {
    point.x = e.clientX;
    point.y = e.clientY;
  }
  point = point.matrixTransform(container.getScreenCTM().inverse());
  return [point.x, point.y];
};
d3.svg.touches = function(container) {
  var touches = d3.event.touches;
  return touches ? d3_array(touches).map(function(touch) {
    var point = d3_svg_mousePoint(container, touch);
    point.identifier = touch.identifier;
    return point;
  }) : [];
};
d3.svg.symbol = function() {
  var type = d3_svg_symbolType,
      size = d3_svg_symbolSize;

  function symbol(d, i) {
    return (d3_svg_symbols[type.call(this, d, i)]
        || d3_svg_symbols.circle)
        (size.call(this, d, i));
  }

  symbol.type = function(x) {
    if (!arguments.length) return type;
    type = d3.functor(x);
    return symbol;
  };