tenderlove/index.html

## index.html
<!DOCTYPE html>
<html>
  <head>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
    <link type="text/css" rel="stylesheet" href="style.css"/>
    <script src="http://d3js.org/d3.v3.min.js"></script>
    <style>
      .node circle {
        cursor: pointer;
        fill: #fff;
        stroke: steelblue;
        stroke-width: 1.5px;
      }

      .node text {
        font-size: 11px;
      }

      path.link {
        fill: none;
        stroke: #ccc;
        stroke-width: 1.5px;
      }
    </style>
  </head>
  <body>
    <div id="body">
    </div>
    <script src="tree.js"></script>
  </body>
</html>

## test.rb
require 'webrick'
require 'json'
require 'objspace'

ROOT = [
  Object.new,
  1,
  { "foo" => :bar, 2.2 => [1,2,3,4] }
]

def leaves o
  ObjectSpace.reachable_objects_from(o).map do |obj|
    node obj
  end
end

def node o
  {
    'name'       => o.class,
    'child_link' => "/leaves.json?id=#{o.object_id}"
  }
end

server = WEBrick::HTTPServer.new Port: 8000, DocumentRoot: '.'

server.mount_proc '/leaves.json' do |req, res|
  id = req.query['id'].to_i
  res.body = JSON.dump leaves ObjectSpace._id2ref id
end

server.mount_proc '/root.json' do |req, res|
  res.body = JSON.dump node ROOT
end

trap 'INT' do server.shutdown end

server.start

## tree.js
var m = [20, 120, 20, 120],
    w = 1280 - m[1] - m[3],
    h = 800 - m[0] - m[2],
    i = 0,
    root;

var tree = d3.layout.tree()
    .size([h, w]);

var diagonal = d3.svg.diagonal()
    .projection(function(d) { return [d.y, d.x]; });

var vis = d3.select("#body").append("svg:svg")
    .attr("width", w + m[1] + m[3])
    .attr("height", h + m[0] + m[2])
  .append("svg:g")
    .attr("transform", "translate(" + m[3] + "," + m[0] + ")");

d3.json("root.json", function(json) {
  root = json;
  root.x0 = h / 2;
  root.y0 = 0;

  function toggleAll(d) {
    if (d.children) {
      d.children.forEach(toggleAll);
      toggle(d);
    }
  }

  update(root);
});

function click(d) {
  toggle(d);

  if (d.seen) {
    update(d);
  } else {
    d3.json(d.child_link, function(json) {
      d.children = json;
      d.seen = true;
      update(d);
    });
  }
}

function update(source) {
  var duration = d3.event && d3.event.altKey ? 5000 : 500;

  // Compute the new tree layout.
  var nodes = tree.nodes(root).reverse();

  // Normalize for fixed-depth.
  nodes.forEach(function(d) { d.y = d.depth * 180; });

  // Update the nodes…
  var node = vis.selectAll("g.node")
      .data(nodes, function(d) { return d.id || (d.id = ++i); });

  // Enter any new nodes at the parent's previous position.
  var nodeEnter = node.enter().append("svg:g")
      .attr("class", "node")
      .attr("transform", function(d) { return "translate(" + source.y0 + "," + source.x0 + ")"; })
      .on("click", click);

  nodeEnter.append("svg:circle")
      .attr("r", 1e-6)
      .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

  nodeEnter.append("svg:text")
      .attr("x", function(d) { return d.children || d._children ? -10 : 10; })
      .attr("dy", ".35em")
      .attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; })
      .text(function(d) { return d.name; })
      .style("fill-opacity", 1e-6);

  // Transition nodes to their new position.
  var nodeUpdate = node.transition()
      .duration(duration)
      .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; });

  nodeUpdate.select("circle")
      .attr("r", 4.5)
      .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

  nodeUpdate.select("text")
      .style("fill-opacity", 1);

  // Transition exiting nodes to the parent's new position.
  var nodeExit = node.exit().transition()
      .duration(duration)
      .attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; })
      .remove();

  nodeExit.select("circle")
      .attr("r", 1e-6);

  nodeExit.select("text")
      .style("fill-opacity", 1e-6);

  // Update the links…
  var link = vis.selectAll("path.link")
      .data(tree.links(nodes), function(d) { return d.target.id; });

  // Enter any new links at the parent's previous position.
  link.enter().insert("svg:path", "g")
      .attr("class", "link")
      .attr("d", function(d) {
        var o = {x: source.x0, y: source.y0};
        return diagonal({source: o, target: o});
      })
    .transition()
      .duration(duration)
      .attr("d", diagonal);

  // Transition links to their new position.
  link.transition()
      .duration(duration)
      .attr("d", diagonal);

  // Transition exiting nodes to the parent's new position.
  link.exit().transition()
      .duration(duration)
      .attr("d", function(d) {
        var o = {x: source.x, y: source.y};
        return diagonal({source: o, target: o});
      })
      .remove();

  // Stash the old positions for transition.
  nodes.forEach(function(d) {
    d.x0 = d.x;
    d.y0 = d.y;
  });
}

// Toggle children.
function toggle(d) {
  if (d.children) {
    d._children = d.children;
    d.children = null;
  } else {
    d.children = d._children;
    d._children = null;
  }
}
	<!DOCTYPE html>
	<html>
	<head>
	<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
	<link type="text/css" rel="stylesheet" href="style.css"/>
	<script src="http://d3js.org/d3.v3.min.js"></script>
	<style>
	.node circle {
	cursor: pointer;
	fill: #fff;
	stroke: steelblue;
	stroke-width: 1.5px;
	}

	.node text {
	font-size: 11px;
	}

	path.link {
	fill: none;
	stroke: #ccc;
	stroke-width: 1.5px;
	}
	</style>
	</head>
	<body>
	<div id="body">
	</div>
	<script src="tree.js"></script>
	</body>
	</html>
	require 'webrick'
	require 'json'
	require 'objspace'

	ROOT = [
	Object.new,
	1,
	{ "foo" => :bar, 2.2 => [1,2,3,4] }
	]

	def leaves o
	ObjectSpace.reachable_objects_from(o).map do \|obj\|
	node obj
	end
	end

	def node o
	{
	'name' => o.class,
	'child_link' => "/leaves.json?id=#{o.object_id}"
	}
	end

	server = WEBrick::HTTPServer.new Port: 8000, DocumentRoot: '.'

	server.mount_proc '/leaves.json' do \|req, res\|
	id = req.query['id'].to_i
	res.body = JSON.dump leaves ObjectSpace._id2ref id
	end

	server.mount_proc '/root.json' do \|req, res\|
	res.body = JSON.dump node ROOT
	end

	trap 'INT' do server.shutdown end

	server.start
	var m = [20, 120, 20, 120],
	w = 1280 - m[1] - m[3],
	h = 800 - m[0] - m[2],
	i = 0,
	root;

	var tree = d3.layout.tree()
	.size([h, w]);

	var diagonal = d3.svg.diagonal()
	.projection(function(d) { return [d.y, d.x]; });

	var vis = d3.select("#body").append("svg:svg")
	.attr("width", w + m[1] + m[3])
	.attr("height", h + m[0] + m[2])
	.append("svg:g")
	.attr("transform", "translate(" + m[3] + "," + m[0] + ")");

	d3.json("root.json", function(json) {
	root = json;
	root.x0 = h / 2;
	root.y0 = 0;

	function toggleAll(d) {
	if (d.children) {
	d.children.forEach(toggleAll);
	toggle(d);
	}
	}

	update(root);
	});

	function click(d) {
	toggle(d);

	if (d.seen) {
	update(d);
	} else {
	d3.json(d.child_link, function(json) {
	d.children = json;
	d.seen = true;
	update(d);
	});
	}
	}

	function update(source) {
	var duration = d3.event && d3.event.altKey ? 5000 : 500;

	// Compute the new tree layout.
	var nodes = tree.nodes(root).reverse();

	// Normalize for fixed-depth.
	nodes.forEach(function(d) { d.y = d.depth * 180; });

	// Update the nodes…
	var node = vis.selectAll("g.node")
	.data(nodes, function(d) { return d.id \|\| (d.id = ++i); });

	// Enter any new nodes at the parent's previous position.
	var nodeEnter = node.enter().append("svg:g")
	.attr("class", "node")
	.attr("transform", function(d) { return "translate(" + source.y0 + "," + source.x0 + ")"; })
	.on("click", click);

	nodeEnter.append("svg:circle")
	.attr("r", 1e-6)
	.style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

	nodeEnter.append("svg:text")
	.attr("x", function(d) { return d.children \|\| d._children ? -10 : 10; })
	.attr("dy", ".35em")
	.attr("text-anchor", function(d) { return d.children \|\| d._children ? "end" : "start"; })
	.text(function(d) { return d.name; })
	.style("fill-opacity", 1e-6);

	// Transition nodes to their new position.
	var nodeUpdate = node.transition()
	.duration(duration)
	.attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; });

	nodeUpdate.select("circle")
	.attr("r", 4.5)
	.style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });

	nodeUpdate.select("text")
	.style("fill-opacity", 1);

	// Transition exiting nodes to the parent's new position.
	var nodeExit = node.exit().transition()
	.duration(duration)
	.attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; })
	.remove();

	nodeExit.select("circle")
	.attr("r", 1e-6);

	nodeExit.select("text")
	.style("fill-opacity", 1e-6);

	// Update the links…
	var link = vis.selectAll("path.link")
	.data(tree.links(nodes), function(d) { return d.target.id; });

	// Enter any new links at the parent's previous position.
	link.enter().insert("svg:path", "g")
	.attr("class", "link")
	.attr("d", function(d) {
	var o = {x: source.x0, y: source.y0};
	return diagonal({source: o, target: o});
	})
	.transition()
	.duration(duration)
	.attr("d", diagonal);

	// Transition links to their new position.
	link.transition()
	.duration(duration)
	.attr("d", diagonal);

	// Transition exiting nodes to the parent's new position.
	link.exit().transition()
	.duration(duration)
	.attr("d", function(d) {
	var o = {x: source.x, y: source.y};
	return diagonal({source: o, target: o});
	})
	.remove();

	// Stash the old positions for transition.
	nodes.forEach(function(d) {
	d.x0 = d.x;
	d.y0 = d.y;
	});
	}

	// Toggle children.
	function toggle(d) {
	if (d.children) {
	d._children = d.children;
	d.children = null;
	} else {
	d.children = d._children;
	d._children = null;
	}
	}