D3 Examples - Radial Cluster with Offsets

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.node circle {
  fill: #c9c9c9;
  fill-opacity: 0.8;
}
​
.node text {
  font: 10px sans-serif;
}
​
.node--internal circle {
  fill: #898989;
}
​
.node--internal text {
  text-shadow: 0 1px 0 #fff, 0 -1px 0 #fff, 1px 0 0 #fff, -1px 0 0 #fff;
}
​
.link {
  fill: none;
  stroke: #afafaf;
  stroke-opacity: 0.4;
  stroke-width: 1.5px;
}
​
</style>
<svg width="960" height="1060"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
​
var svg = d3.select("svg"),
    width = 960//+svg.attr("width"),
    height = 500//+svg.attr("height"),
    g = svg.append("g").attr("transform", "translate(" + (width / 2 + 40) + "," + (height / 2 + 90) + ")");
  
var nodeRadius = 6;
var radius = 200;
​
var stratify = d3.stratify()
    .parentId(function(d) { return d.id.substring(0, d.id.lastIndexOf(".")); });
​
var tree = d3.cluster()
    .size([360, radius])
    .separation(function(a, b) { return (a.parent == b.parent ? 1 : 2) / a.depth; });
  
var center = { x: 0, y: 0 }  
// g.append("circle")
// .attr("cx", 0)
// .attr("cy", 0)
// .attr("r", 20)
//.style("fill", "#f00")
​
d3.csv("flare.csv", function(error, data) {
  if (error) throw error;
​
  var stratified = stratify(data)
  .sort(function(a, b) {
        if(a.depth === 1 && b.depth === 1) {
          var alen = a.children ? a.children.length : 0
          var blen = b.children ? b.children.length : 0
          return blen - alen
          }
        return (a.height - b.height) || a.data.id.localeCompare(b.data.id);
      });
  var root = tree(stratified);
  
  var nodes = root.descendants().slice(1)
  var leaves = nodes.filter(function(d) { return !d.children})
  var nested = d3.nest()
    .key(function(d) { return d.parent.data.id})
    .rollup(function(ls) { return ls })
    .entries(leaves)
​
  nested.forEach(function(n) {
   
    var maxTheta = d3.max(n.value, function(d) { return d.x })
    var minTheta = d3.min(n.value, function(d) { return d.x })
    var theta = maxTheta - minTheta
​
    var arclen = (theta/360) * radius * Math.PI * 2
    var comfort = Math.floor(arclen/(nodeRadius * .85)) // TODO: figure out this formula
    // TODO: comfort should shrink as levels progress...
    console.log(n.key, theta, arclen, comfort)
    var maxlevel = Math.floor(n.value.length/comfort*2);
    if(n.value.length === 1) return;
    n.value.forEach(function(d,i) {
      // TODO: figure out how to spread these out
      var level = Math.floor(i/comfort)// % maxlevel
      d.y -= nodeRadius * level * 1.5
      
//       if(i % 2 == 0) {
//         d.dx = -(center.x - d.x)/radius * nodeRadius * 1.5
//         d.x += d.dx
//         d.dy = -(center.y - d.y)/radius * nodeRadius * 1.5
//         d.y += d.dy
        //d.y -= nodeRadius * 1.5
//       }
    })
  })
  console.log("nested", nested)
  
​
​
  var link = g.selectAll(".link")
    .data(nodes)
    .enter().append("path")
      .attr("class", "link")
      .attr("d", function(d) {
        return "M" + project(d.x, d.y)
            + "C" + project(d.x, (d.y + d.parent.y) / 2)
            + " " + project(d.parent.x, (d.y + d.parent.y) / 2)
            + " " + project(d.parent.x, d.parent.y);
      });
​
  var node = g.selectAll(".node")
    .data(root.descendants())
    .enter().append("g")
      .attr("class", function(d) { return "node" + (d.children ? " node--internal" : " node--leaf"); })
      .attr("transform", function(d) { return "translate(" + project(d.x, d.y) + ")"; });
​
  node.append("circle")
      .attr("r", nodeRadius)
  .on("click", function(d) { console.log("d", d) })
/*
  node.append("text")
      .attr("dy", ".31em")
      .attr("x", function(d) { return d.x < 180 === !d.children ? 6 : -6; })
      .style("text-anchor", function(d) { return d.x < 180 === !d.children ? "start" : "end"; })
      .attr("transform", function(d) { return "rotate(" + (d.x < 180 ? d.x - 90 : d.x + 90) + ")"; })
      .text(function(d) { return d.id.substring(d.id.lastIndexOf(".") + 1); });
      */
});
​
​
function project(x, y) {
  var angle = (x - 90) / 180 * Math.PI, radius = y;
  return [radius * Math.cos(angle), radius * Math.sin(angle)];
}
​
</script>
    