{"url":"https://api.github.com/gists/5681842","forks_url":"https://api.github.com/gists/5681842/forks","commits_url":"https://api.github.com/gists/5681842/commits","id":"5681842","node_id":"MDQ6R2lzdDU2ODE4NDI=","git_pull_url":"https://gist.github.com/5681842.git","git_push_url":"https://gist.github.com/5681842.git","html_url":"https://gist.github.com/mbostock/5681842","files":{".block":{"filename":".block","type":"text/plain","language":null,"raw_url":"https://gist.githubusercontent.com/mbostock/5681842/raw/703d310b399098a243a76a50bc209167e924cfd2/.block","size":17,"truncated":false,"content":"license: gpl-3.0\n","encoding":"utf-8"},"README.md":{"filename":"README.md","type":"text/markdown","language":"Markdown","raw_url":"https://gist.githubusercontent.com/mbostock/5681842/raw/0097b9f1cdf37aa8f006511d5403e849c4d9cd8a/README.md","size":410,"truncated":false,"content":"The easiest way to [transition between pie charts](/mbostock/1346410) with differently-sized datasets (while maintaining [object constancy](http://bost.ocks.org/mike/constancy/)) is to set the missing values to zero.\n\n```js\nfunction type(d) {\n  d.apples = +d.apples || 0;\n  d.oranges = +d.oranges || 0;\n  return d;\n}\n```\n\nNext: [Static Data-Join](/mbostock/5681974)<br>\nPrevious: [Animation](/mbostock/1346410)","encoding":"utf-8"},"data.tsv":{"filename":"data.tsv","type":"text/tab-separated-values","language":"TSV","raw_url":"https://gist.githubusercontent.com/mbostock/5681842/raw/cdc5c991805cd9f5a54d605efd953476294988f3/data.tsv","size":57,"truncated":false,"content":"apples\toranges\n53245\t200\n28479\n19697\t200\n24037\n40245\t200\n","encoding":"utf-8"},"index.html":{"filename":"index.html","type":"text/html","language":"HTML","raw_url":"https://gist.githubusercontent.com/mbostock/5681842/raw/a8c4b2c652b629e2635143c19b4b9ba7190add3a/index.html","size":2192,"truncated":false,"content":"<!DOCTYPE html>\n<meta charset=\"utf-8\">\n<style>\n\nbody {\n  font-family: \"Helvetica Neue\", Helvetica, Arial, sans-serif;\n  margin: auto;\n  position: relative;\n  width: 960px;\n}\n\ntext {\n  font: 10px sans-serif;\n}\n\nform {\n  position: absolute;\n  right: 10px;\n  top: 10px;\n}\n\n</style>\n<form>\n  <label><input type=\"radio\" name=\"dataset\" value=\"apples\" checked> Apples</label>\n  <label><input type=\"radio\" name=\"dataset\" value=\"oranges\"> Oranges</label>\n</form>\n<script src=\"//d3js.org/d3.v3.min.js\"></script>\n<script>\n\nvar width = 960,\n    height = 500,\n    radius = Math.min(width, height) / 2;\n\nvar color = d3.scale.category20();\n\nvar pie = d3.layout.pie()\n    .value(function(d) { return d.apples; })\n    .sort(null);\n\nvar arc = d3.svg.arc()\n    .innerRadius(radius - 100)\n    .outerRadius(radius - 20);\n\nvar svg = d3.select(\"body\").append(\"svg\")\n    .attr(\"width\", width)\n    .attr(\"height\", height)\n  .append(\"g\")\n    .attr(\"transform\", \"translate(\" + width / 2 + \",\" + height / 2 + \")\");\n\nd3.tsv(\"data.tsv\", type, function(error, data) {\n  var path = svg.datum(data).selectAll(\"path\")\n      .data(pie)\n    .enter().append(\"path\")\n      .attr(\"fill\", function(d, i) { return color(i); })\n      .attr(\"d\", arc)\n      .each(function(d) { this._current = d; }); // store the initial angles\n\n  d3.selectAll(\"input\")\n      .on(\"change\", change);\n\n  var timeout = setTimeout(function() {\n    d3.select(\"input[value=\\\"oranges\\\"]\").property(\"checked\", true).each(change);\n  }, 2000);\n\n  function change() {\n    var value = this.value;\n    clearTimeout(timeout);\n    pie.value(function(d) { return d[value]; }); // change the value function\n    path = path.data(pie); // compute the new angles\n    path.transition().duration(750).attrTween(\"d\", arcTween); // redraw the arcs\n  }\n});\n\nfunction type(d) {\n  d.apples = +d.apples || 0;\n  d.oranges = +d.oranges || 0;\n  return d;\n}\n\n// Store the displayed angles in _current.\n// Then, interpolate from _current to the new angles.\n// During the transition, _current is updated in-place by d3.interpolate.\nfunction arcTween(a) {\n  var i = d3.interpolate(this._current, a);\n  this._current = i(0);\n  return function(t) {\n    return arc(i(t));\n  };\n}\n\n</script>\n","encoding":"utf-8"},"thumbnail.png":{"filename":"thumbnail.png","type":"image/png","language":null,"raw_url":"https://gist.githubusercontent.com/mbostock/5681842/raw/be90eb471c3572e5855824c7021f2de2b8eedd10/thumbnail.png","size":6213,"truncated":false,"content":"iVBORw0KGgoAAAANSUhEUgAAAOYAAAB4CAYAAADmBo6IAAAAGXRFWHRTb2Z0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\np+X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