D3 Examples - Delete and rework

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<!DOCTYPE html>
<meta charset="utf-8">
<title>SANKEY Experiment</title>
<style>
body {
  font-family: Helvetica;
  font-size:0.6em;
 }
.node rect {
  cursor: move;
  fill-opacity: .9;
  shape-rendering: crispEdges;
}
.node text {
  pointer-events: none;
  text-shadow: 0 1px 0 #fff;
}
.link {
  fill: none;
  stroke: #000;
}
.link:hover {
  stroke-opacity: .5;
}
</style>
<body>
​
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="sankey.js"></script>
<script>
console.clear()
var units = "percent",
    iterations = 0;
​
// set the dimensions and margins of the graph
var margin = {top: 10, right: 10, bottom: 10, left: 10},
    width = 420 - margin.left - margin.right,
    height = 690 - margin.top - margin.bottom;
​
// format variables
var formatNumber = d3.format(",.0f"),    // zero decimal places
    format = function(d) { return formatNumber(d) + " " + units; }
​
// append the svg object to the body of the page
var svg = d3.select("body").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(2)
    .nodePadding(2)
    .size([width, height]);
​
var path = sankey.link();
​
// load the data
d3.json("sankey.json", function(error, graph) {
​
  sankey
      .nodes(graph.nodes)
      .links(graph.links)
      .layout(iterations);
​
// add in the links
  var link = svg.append("g").selectAll(".link")
      .data(graph.links)
    .enter().append("path")
      .attr("class", "link")
      .attr("d", path)
      .style("stroke-width", function(d) { return Math.max(1, d.dy); })
        .style("stroke", (d) => color(d.source.name))
        .style("opacity", (d) => 1)
      .sort(function(a, b) { return b.dy - a.dy; });
​
// add the link titles
/*
  link.append("title")
        .text(function(d) {
            return d.source.label + " → " + 
                d.target.label + "\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 + ")"; })
      .call(d3.drag()
        .subject(function(d) {
          return d;
        })
        .on("start", 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", (d) => color(d.name))
      .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((d)=> d.name + ': ' + Math.round(d.value * 100) + '%')
    .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);
  }
});
  
function color(s) {
​
  switch(s) {
    case "Non-communicable diseases":
      return '#009a93'
    case "_Misc":
      return '#009cde'
    case "_Injuries":
      return '#006ab4'
  }
  
  return '#ccc'
}
​
function opacity(s) {
  switch(s) {
    case "Cancers":
      return 0.2
    case "Cardiovascular disease":
      return 0.3
    case "Other non-communicable diseases":
      return 0.4
    case "Musculoskeletal conditions":
      return 0.5
    case "Mental disorders":
      return 0.6
    case "Neurological disorders":
      return 0.7
    case "Chronic respiratory diseases":
      return 0.8
    case "Diabetes, chronic kidney diseases":
      return 0.9
    case "Substance use disorders":
      return 1.0
    default:
      return 1.0
  }
}
  
</script>
​
</body>
​
​
    