D3 Examples - Meetup Topic Adjacency Matrix

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<html xmlns="https://www.w3.org/1999/xhtml">
<head>
  <title>D3 in Action Adjacency Matrix</title>
  <meta charset="utf-8" />
</head>
<script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>
<script src="https://d3js.org/queue.v1.min.js" type="text/javascript"></script>
<style>
.tick line {
  shape-rendering: crispEdges;
  stroke: #000;
}
​
line.minor  {
  stroke: #777;
  stroke-dasharray: 2,2;
}
​
path.domain {
  fill: none;
  stroke: black; 
}
​
g text {
  font-size: 12;
}
​
</style>
<body onload="adjacency()">
​
<div id="vizcontainer">
<svg style="width:1000px;height:1000px;border:1px lightgray solid;" />
</div>
  <footer>
<script>
  
  function adjacency() {
​
    queue()
    .defer(d3.csv, "nodelist.csv")
    .defer(d3.csv, "edgelist.csv")
    .await(function(error, file1, file2) { createAdjacencyMatrix(file1, file2); });
    
    function createAdjacencyMatrix(nodes,edges) {
      var edgeHash = {};
      for (x in edges) {
        var id = edges[x].source + "-" + edges[x].target;
        edgeHash[id] = edges[x];
      }
      matrix = [];
      //create all possible edges
      for (a in nodes) {
        for (b in nodes) {
          var grid = {id: nodes[a].id + "-" + nodes[b].id, x: b, y: a, weight: 0};
          if (edgeHash[grid.id]) {
            grid.weight = edgeHash[grid.id].weight;
          }
          matrix.push(grid);
        }
      }
​
      var weightScale = d3.scale.linear()
        .domain(d3.extent(function(d){ return d.weight }))
        .range([0,1])
      
      d3.select("svg")
      .append("g")
      .attr("transform", "translate(220,220)")
      .attr("id", "adjacencyG")
      .selectAll("rect")
      .data(matrix)
    .enter()
      .append("rect")
      .attr("width", 15)
      .attr("height", 15)
      .attr("x", function (d) {return d.x * 15})
      .attr("y", function (d) {return d.y * 15})
      .style("stroke", "black")
      .style("stroke-width", "1px")
      .style("fill", "steelblue")
      .style("fill-opacity", function (d) {return d.weight*0.04; })
      .on("mouseover", gridOver)
    .append("svg:title")
      .text(function(d, i) { return d.weight + " co-occurences"; });
      
      var scaleSize = nodes.length * 15;
      var nameScale = d3.scale.ordinal().domain(nodes.map(function (el) {return el.id})).rangePoints([0,scaleSize],1);
​
      xAxis = d3.svg.axis()
        .scale(nameScale)
        .orient("top")
        .tickSize(4);
​
      yAxis = d3.svg.axis().scale(nameScale).orient("left").tickSize(4);    
      
      d3.select("#adjacencyG").append("g")
        .call(xAxis)
      .selectAll("text")
        .style("text-anchor", "end")
        .attr("transform", "translate(-10,-10) rotate(90)");
​
      d3.select("#adjacencyG").append("g")
        .call(yAxis);
      
      function gridOver(d,i) {
        d3.selectAll("rect")
          .style("stroke-width", function (p) {return p.x == d.x || p.y == d.y ? "3px" : "1px"})
      }
​
    }
    
  }
  </script>
  </footer>
</body>
</html>
    