D3 Examples - GDOT Research Project Demo

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<!DOCTYPE html>
<meta charset="utf-8">
<title>GDOT Pavement Preservation Treatment Selection Tool</title>
<style>
body {
    font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,"Open Sans","Helvetica Neue",sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 14px;
    margin: 5px;
    margin-bottom: 10px;
}
​
.node rect {
  cursor: move;
  fill-opacity: .6;
  shape-rendering: crispEdges;
}
​
.node text {
  pointer-events: none;
  text-shadow: 0 1px 0 #fff;
}
​
.link {
  fill: none;
  stroke: #000;
  stroke-opacity: .2;
}
​
.link:hover {
  stroke-opacity: .5;
}
​
</style>
<body>
​
<p id="chart">
​
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="sankey.js"></script>
<script>
    
var units = "Widgets";
​
var margin = {top: 10, right: 10, bottom: 10, left: 10},
    width = 900 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
​
var formatNumber = d3.format(",.0f"),    // zero decimal places
    format = function(d) { return formatNumber(d) + " " + units; },
    color = d3.scale.category20();
​
// append the svg canvas to the page
var svg = d3.select("#chart").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", 
          "translate(" + margin.left + "," + margin.top + ")");
​
// Set the sankey diagram properties
var sankey = d3.sankey()
    .nodeWidth(20)
    .nodePadding(40)
    .size([width, height]);
​
var path = sankey.link();
​
// load the data
d3.json("sankey-formatted.json", function(graph) {
​
  sankey
      .nodes(graph.nodes)
      .links(graph.links)
      .layout(32);
​
// add in the links
  var link = svg.append("g").selectAll(".link")
      .data(graph.links)
    .enter().append("path")
      .attr("class", "link")
      .attr("d", path)
      .attr("id", function(d,i){
        d.id = i;
        return "link-"+i;
      })
      .style("stroke-width", function(d) { return Math.max(1, d.dy); })
      .sort(function(a, b) { return b.dy - a.dy; });
​
// add the link titles
  link.append("title")
        .text(function(d) {
            return d.source.name + " → " + 
                d.target.name + "\n" + format(d.value); });
​
// add in the nodes
  var node = svg.append("g").selectAll(".node")
      .data(graph.nodes)
    .enter().append("g")
      .attr("class", "node")
      .attr("transform", function(d) { 
          return "translate(" + d.x + "," + d.y + ")"; })
      .on("click",highlight_node_links)
    .call(d3.behavior.drag()
      .origin(function(d) { return d; })
      .on("dragstart", function() { 
          this.parentNode.appendChild(this); })
      .on("drag", dragmove));
​
// add the rectangles for the nodes
  node.append("rect")
      .attr("height", function(d) { return d.dy; })
      .attr("width", sankey.nodeWidth())
      .style("fill", function(d) { 
          return d.color = color(d.name.replace(/ .*/, "")); })
      .style("stroke", function(d) { 
          return d3.rgb(d.color).darker(2); })
    .append("title")
      .text(function(d) { 
          return d.name + "\n" + format(d.value); });
​
// add in the title for the nodes
  node.append("text")
      .attr("x", -6)
      .attr("y", function(d) { return d.dy / 2; })
      .attr("dy", ".35em")
      .attr("text-anchor", "end")
      .attr("transform", null)
      .text(function(d) { return d.name; })
    .filter(function(d) { return d.x < width / 2; })
      .attr("x", 6 + sankey.nodeWidth())
      .attr("text-anchor", "start");
​
// the function for moving the nodes
  function dragmove(d) {
    d3.select(this).attr("transform", 
        "translate(" + d.x + "," + (
                d.y = Math.max(0, Math.min(height - d.dy, d3.event.y))
            ) + ")");
    sankey.relayout();
    link.attr("d", path);
  }
  
// Highlight all links when clicking a node (src: https://bl.ocks.org/git-ashish/8959771)
  function highlight_node_links(node,i){
​
    var remainingNodes=[],
        nextNodes=[];
​
    var stroke_opacity = 0;
    if( d3.select(this).attr("data-clicked") == "1" ){
      d3.select(this).attr("data-clicked","0");
      stroke_opacity = 0.2;
    }else{
      d3.select(this).attr("data-clicked","1");
      stroke_opacity = 0.5;
    }
​
    var traverse = [{
                      linkType : "sourceLinks",
                      nodeType : "target"
                    },{
                      linkType : "targetLinks",
                      nodeType : "source"
                    }];
​
    traverse.forEach(function(step){
      node[step.linkType].forEach(function(link) {
        remainingNodes.push(link[step.nodeType]);
        highlight_link(link.id, stroke_opacity);
      });
​
      while (remainingNodes.length) {
        nextNodes = [];
        remainingNodes.forEach(function(node) {
          node[step.linkType].forEach(function(link) {
            nextNodes.push(link[step.nodeType]);
            highlight_link(link.id, stroke_opacity);
          });
        });
        remainingNodes = nextNodes;
      }
    });
  }
​
  function highlight_link(id,opacity){
      d3.select("#link-"+id).style("stroke-opacity", opacity);
  }
});
​
</script>
​
</body>
</html>
​
    