hw 4 circle packing

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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">

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</head>

<body>

<h2>Circle Packing</h2>
<svg id="circle_packing"></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: 900,
    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 drawCirclePacking(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");
  
  var xshift = config.pad + (config.w - config.d) / 2;
  var yshift = config.pad + (config.h - config.d) / 2;
  g.attr("transform", translate(xshift, yshift));
  
  root.sum(function(d) { return d.value; });

// setup circle packing layout
  var diameter = config.d - 2 * config.pad;
  var pack = d3.pack().size([diameter, diameter]).padding(1);

// run layout to calculate x, y, and r attributes
  pack(root);

// draw nested circles
  drawNodes(g, root.descendants(), false);

// TODO
}
</script>
</body>

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