D3 Examples - VI7 matrix

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<!DOCTYPE html>
<html class="ocks-org do-not-copy">
<meta charset="utf-8">
<title>State Borders</title>
<style>
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@import url(../style.css?aea6f0a);
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.background {
  fill: #eee;
}
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line {
  stroke: #fff;
}
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text.active {
  fill: red;
}
​
</style>
<script src="//d3js.org/d3.v2.min.js" charset="utf-8"></script>
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<header>
  <a href="../" rel="author">Lloyd Decker</a>
</header>
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<h1><i>State Borders</i> Co-occurrence</h1>
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<aside style="margin-top:80px;">
<p>Order: <select id="order">
  <option value="name">by Name</option>
  <option value="count">by Frequency</option>
  <option value="group">by Cluster</option>
</select>
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<p>Use the drop-down menu to reorder the matrix and explore the data.
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<p>Built with <a href="https://d3js.org/">d3.js</a>.
</aside>
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<script>
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var margin = {top: 80, right: 0, bottom: 10, left: 80},
    width = 720,
    height = 720;
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var x = d3.scale.ordinal().rangeBands([0, width]),
    z = d3.scale.linear().domain([0, 4]).clamp(true),
    c = d3.scale.category10().domain(d3.range(10));
​
var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
    .style("margin-left", -margin.left + "px")
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
​
d3.json("state.json", function(state) {
  var matrix = [],
      nodes = state.nodes,
      n = nodes.length;
​
  // Compute index per node.
  nodes.forEach(function(node, i) {
    node.index = i;
    node.count = 0;
    matrix[i] = d3.range(n).map(function(j) { return {x: j, y: i, z: 0}; });
  });
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  // Convert links to matrix; count character occurrences.
  state.links.forEach(function(link) {
    matrix[link.source][link.target].z += link.value;
    matrix[link.target][link.source].z += link.value;
    matrix[link.source][link.source].z += link.value;
    matrix[link.target][link.target].z += link.value;
    nodes[link.source].count += link.value;
    nodes[link.target].count += link.value;
  });
​
  // Precompute the orders.
  var orders = {
    name: d3.range(n).sort(function(a, b) { return d3.ascending(nodes[a].name, nodes[b].name); }),
    count: d3.range(n).sort(function(a, b) { return nodes[b].count - nodes[a].count; }),
    group: d3.range(n).sort(function(a, b) { return nodes[b].group - nodes[a].group; })
  };
​
  // The default sort order.
  x.domain(orders.name);
​
  svg.append("rect")
      .attr("class", "background")
      .attr("width", width)
      .attr("height", height);
​
  var row = svg.selectAll(".row")
      .data(matrix)
    .enter().append("g")
      .attr("class", "row")
      .attr("transform", function(d, i) { return "translate(0," + x(i) + ")"; })
      .each(row);
​
  row.append("line")
      .attr("x2", width);
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  row.append("text")
      .attr("x", -6)
      .attr("y", x.rangeBand() / 2)
      .attr("dy", ".32em")
      .attr("text-anchor", "end")
      .text(function(d, i) { return nodes[i].name; });
​
  var column = svg.selectAll(".column")
      .data(matrix)
    .enter().append("g")
      .attr("class", "column")
      .attr("transform", function(d, i) { return "translate(" + x(i) + ")rotate(-90)"; });
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  column.append("line")
      .attr("x1", -width);
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  column.append("text")
      .attr("x", 6)
      .attr("y", x.rangeBand() / 2)
      .attr("dy", ".32em")
      .attr("text-anchor", "start")
      .text(function(d, i) { return nodes[i].name; });
​
  function row(row) {
    var cell = d3.select(this).selectAll(".cell")
        .data(row.filter(function(d) { return d.z; }))
      .enter().append("rect")
        .attr("class", "cell")
        .attr("x", function(d) { return x(d.x); })
        .attr("width", x.rangeBand())
        .attr("height", x.rangeBand())
        .style("fill-opacity", function(d) { return z(d.z); })
        .style("fill", function(d) { return nodes[d.x].group == nodes[d.y].group ? c(nodes[d.x].group) : null; })
        .on("mouseover", mouseover)
        .on("mouseout", mouseout);
  }
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  function mouseover(p) {
    d3.selectAll(".row text").classed("active", function(d, i) { return i == p.y; });
    d3.selectAll(".column text").classed("active", function(d, i) { return i == p.x; });
  }
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  function mouseout() {
    d3.selectAll("text").classed("active", false);
  }
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  d3.select("#order").on("change", function() {
    clearTimeout(timeout);
    order(this.value);
  });
​
  function order(value) {
    x.domain(orders[value]);
​
    var t = svg.transition().duration(2500);
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    t.selectAll(".row")
        .delay(function(d, i) { return x(i) * 4; })
        .attr("transform", function(d, i) { return "translate(0," + x(i) + ")"; })
      .selectAll(".cell")
        .delay(function(d) { return x(d.x) * 4; })
        .attr("x", function(d) { return x(d.x); });
​
    t.selectAll(".column")
        .delay(function(d, i) { return x(i) * 4; })
        .attr("transform", function(d, i) { return "translate(" + x(i) + ")rotate(-90)"; });
  }
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  var timeout = setTimeout(function() {
    order("group");
    d3.select("#order").property("selectedIndex", 2).node().focus();
  }, 5000);
});
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</script>
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