{"url":"https://api.github.com/gists/5682158","forks_url":"https://api.github.com/gists/5682158/forks","commits_url":"https://api.github.com/gists/5682158/commits","id":"5682158","node_id":"MDQ6R2lzdDU2ODIxNTg=","git_pull_url":"https://gist.github.com/5682158.git","git_push_url":"https://gist.github.com/5682158.git","html_url":"https://gist.github.com/mbostock/5682158","files":{".block":{"filename":".block","type":"text/plain","language":null,"raw_url":"https://gist.githubusercontent.com/mbostock/5682158/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/5682158/raw/26fa784cf3a666f5d0dfb71225df791ab44f1b01/README.md","size":136,"truncated":false,"content":"This example demonstrates using a data-join with a key function to update a pie chart.\n\nPrevious: [Static Data-Join](/mbostock/5681974)\n","encoding":"utf-8"},"data.tsv":{"filename":"data.tsv","type":"text/tab-separated-values","language":"TSV","raw_url":"https://gist.githubusercontent.com/mbostock/5682158/raw/da2097f95a21e80d050eafac23c70f847ee85233/data.tsv","size":169,"truncated":false,"content":"region\tfruit\tcount\nEast\tApples\t53245\nWest\tApples\t28479\nSouth\tApples\t19697\nNorth\tApples\t24037\nCentral\tApples\t40245\nEast\tOranges\t200\nSouth\tOranges\t200\nCentral\tOranges\t200\n","encoding":"utf-8"},"index.html":{"filename":"index.html","type":"text/html","language":"HTML","raw_url":"https://gist.githubusercontent.com/mbostock/5682158/raw/55e5656725af05c7f0a2ae2fb3debe4ff7380326/index.html","size":3313,"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\ninput {\n  margin: 0 7px;\n}\n\n</style>\n<form></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.count; })\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\nvar path = svg.selectAll(\"path\");\n\nd3.tsv(\"data.tsv\", type, function(error, data) {\n  var regionsByFruit = d3.nest()\n      .key(function(d) { return d.fruit; })\n      .entries(data)\n      .reverse();\n\n  var label = d3.select(\"form\").selectAll(\"label\")\n      .data(regionsByFruit)\n    .enter().append(\"label\");\n\n  label.append(\"input\")\n      .attr(\"type\", \"radio\")\n      .attr(\"name\", \"fruit\")\n      .attr(\"value\", function(d) { return d.key; })\n      .on(\"change\", change)\n    .filter(function(d, i) { return !i; })\n      .each(change)\n      .property(\"checked\", true);\n\n  label.append(\"span\")\n      .text(function(d) { return d.key; });\n\n  function change(region) {\n    var data0 = path.data(),\n        data1 = pie(region.values);\n\n    path = path.data(data1, key);\n\n    path.enter().append(\"path\")\n        .each(function(d, i) { this._current = findNeighborArc(i, data0, data1, key) || d; })\n        .attr(\"fill\", function(d) { return color(d.data.region); })\n      .append(\"title\")\n        .text(function(d) { return d.data.region; });\n\n    path.exit()\n        .datum(function(d, i) { return findNeighborArc(i, data1, data0, key) || d; })\n      .transition()\n        .duration(750)\n        .attrTween(\"d\", arcTween)\n        .remove();\n\n    path.transition()\n        .duration(750)\n        .attrTween(\"d\", arcTween);\n  }\n});\n\nfunction key(d) {\n  return d.data.region;\n}\n\nfunction type(d) {\n  d.count = +d.count;\n  return d;\n}\n\nfunction findNeighborArc(i, data0, data1, key) {\n  var d;\n  return (d = findPreceding(i, data0, data1, key)) ? {startAngle: d.endAngle, endAngle: d.endAngle}\n      : (d = findFollowing(i, data0, data1, key)) ? {startAngle: d.startAngle, endAngle: d.startAngle}\n      : null;\n}\n\n// Find the element in data0 that joins the highest preceding element in data1.\nfunction findPreceding(i, data0, data1, key) {\n  var m = data0.length;\n  while (--i >= 0) {\n    var k = key(data1[i]);\n    for (var j = 0; j < m; ++j) {\n      if (key(data0[j]) === k) return data0[j];\n    }\n  }\n}\n\n// Find the element in data0 that joins the lowest following element in data1.\nfunction findFollowing(i, data0, data1, key) {\n  var n = data1.length, m = data0.length;\n  while (++i < n) 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