hw 4 radial tree

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<link href="https://fonts.googleapis.com/css?family=Source+Sans+Pro:300,900|Source+Code+Pro:300" rel="stylesheet" type="text/css">
  <link rel="stylesheet" href="style.css">

<script src="helpers.js"></script>
  <script src="tooltip.js"></script>
</head>

<body>
<h2>Radial Tree</h2>
<svg id="radial_tree"></svg>

// accessor functions for x and y
var x = function(d) { return d.x; };
var y = function(d) { return d.y; };

// normal line generator
var line = d3.line()
  .curve(d3.curveLinear)
  .x(x)
  .y(y);

// configure size, margin, and circle radius
var config = {
    w: 960,
    h: 450,
    r: 4,
    pad: 10
};

// maximum diameter of circle is minimum dimension
config.d = Math.min(config.w, config.h);

var file = "java8.csv";

d3.csv(file, convert, callback);

function convert(row) {
  var parts = row.name.split(".");
  row.id = row.name;
  row.name = parts[parts.length - 1];
  row.value = +row.value;
  return row;
}

function callback(error, data) {
    if (error) {
        console.warn(file, error);
        return;
    }

function drawLinks(g, links, generator) {
  var paths = g.selectAll("path")
    .data(links)
    .enter()
    .append("path")
    .attr("d", generator)
    .attr("class", "link");
}

function drawRadialTree(id, root) {
  
  var svg = d3.select("body").select("#" + id);
  svg.attr("width", config.w);
  svg.attr("height", config.h);

var g = svg.append("g");
  g.attr("id", "plot");
	g.attr("transform", translate(config.w / 2, config.h / 2));
  
  // TODO
  var tree = d3.tree()
  	.size([360, (config.d / 1.65) - config.pad]);
  
  var root = tree(root);
  
	  root.each(function(d) {
    d.theta = d.x;
    d.radial = d.y;

var point = toCartesian(d.radial, d.theta);
    d.x = point.x;
    d.y = point.y;
  });
  
  drawLinks(g, root.links(), function(d) {
    return line([d.source, d.target]);
  });
  drawNodes(g, root.descendants(), true);
}
  function project(x, y) {
  var angle = (x - 90) / 180 * Math.PI, radius = y;
  return [radius * Math.cos(angle), radius * Math.sin(angle)];
}
</script>
</body>

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