nym/.block

## .block
license: mit

## README.md

      
    Raw
  

              README.md
            
          
    This is an example of a Sankey diagram made using d3.js and the sankey plugin.
It has a point of differenc from other Sankey diagrams I have seen in that the nodes can be moved horizontally and vertically.
A description of how it was put together and techniques for implimenting Sankey diagrams in general with d3.js can be found at d3noob.org or you can download the full text in the D3 Tips and Tricks book (for free) from Leanpub.
The data is sourced from the World Resources Institute (http://www.wri.org/chart/world-greenhouse-gas-emissions-2005).
Open in full window for full effect.
forked from d3noob's block: Sankey diagram with horizontal and vertical node movement

  
## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<title>SANKEY Experiment</title>
<style>

.node rect {
  cursor: move;
  fill-opacity: 1;

 stroke-width: 0;
}

.node text {
  pointer-events: none;
  text-shadow: 0 1px 0 #fff;
  fill: white;
}

.link {
  fill: none;
  stroke: #7ef7d9;
  stroke: linear-gradient(to left, #009487 3%, #7ef7d9);
  stroke-opacity: .8;
}

.link:hover {
  stroke-opacity: 1;
}

</style>
<body>
<p id="chart">

<script src="http://d3js.org/d3.v3.js"></script>
<script src="sankey.js"></script>
<script>

var units = "Widgets";
var smallWidth = 30;
var bigWidth = 170;
var margin = {top: 10, right: 10, bottom: 10, left: 10},
    width = 800,
    height = 500;

var formatNumber = d3.format(",.0f"),    // zero decimal places
    format = function(d) { return formatNumber(d) + " " + units; },
    color = d3.scale.category20();

// append the svg canvas to the page
var svg = d3.select("#chart").append("svg")
    .attr("width", width + 180)
    .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()
    .nodePadding(10)
    .size([width, height]);

var path = sankey.link();

// load the data
d3.json("WithRules.json", function(error, graph) {

    var nodeMap = {};
    graph.nodes.forEach(function(x) { nodeMap[x.name] = x; });
    graph.links = graph.links.map(function(x) {
      return {
        source: nodeMap[x.source],
        target: nodeMap[x.target],
        value: x.value
      };
    });

  sankey
      .nodes(graph.nodes)
      .links(graph.links)
      .layout(0);

// 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); })
      .attr("fill", "none")
      .sort(function(a, b) { return b.dy - a.dy; });

      // add gradient to links

// add the link titles
  link.append("title")
        .text(function(d) {
      	return d.source.name + " → " +
                d.target.name + "\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.behavior.drag()
      .origin(function(d) { return d; })
      .on("dragstart", function() {
		  this.parentNode.appendChild(this); })
      .on("drag", dragmove));


// add the rectangles for the nodes
  console.log(node);
  node.append("rect")
  .attr('x', (d) => {
        return d.x0
      })
      .attr('y', (d) => {
        return d.y0
      })
      .attr('width', (d) => {
        return d.kind == "middle" ? smallWidth : bigWidth;
      })
      .attr("height", function(d) { return d.dy || 100; })
      .style("fill", function(d) {
    return d.kind !== "middle" ? "black" : '#EBEFF2';
		  return d.color = color(d.name.replace(/ .*/, "")); })

    .append("title")
      .text(function(d) {
		  return d.name + "\n" + format(d.value); });

// add in the title for the nodes
  node.append("text")
      .attr("y", function(d) { return d.dy > 20 ? (d.dy / 2) - 10 : 0; })
      .attr("dy", ".85em")
      .attr("text-anchor", "end")
      .attr("transform", null)
      .text((d) => { return d.kind != "middle" ? d.name : ''; })
    .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 = Math.max(0, Math.min(width - d.dx, d3.event.x))
        	) + "," + (
                   d.y = Math.max(0, Math.min(height - d.dy, d3.event.y))
            ) + ")");
    sankey.relayout();
    link.attr("d", path);
  }
});

</script>

</body>
</html>

## NoRules.json
{
    "nodes":[
        {"name":"Android - SDK","kind":"input"},
	{"name":"iOS - SDK","kind":"input"},
	{"name":"Javascript - SDK","kind":"input"},
	{"name":"Braze - S2S","kind":"input"},
	{"name":"Amazon Kinesis Firehose - Default Configuration","kind":"output"},
        {"name":"Appsflyer - Default Configuration","kind":"output"},
        {"name":"Braze - Default Configuration","kind":"output"},
        {"name":"Braze - Marketing Configuration","kind":"output"},
        {"name":"Facebook - Configuration Name","kind":"output"},
        {"name":"Mixpanel - Default Configuration","kind":"output"}
    ],
     "links":[
        {"source":"Android - SDK","target":"Braze - Marketing Configuration","value":4000},
        {"source":"Android - SDK","target":"Appsflyer - Default Configuration","value":9000},
	 {"source":"Android - SDK","target":"Braze - Default Configuration","value":6000},
	{"source":"Android - SDK","target":"Facebook - Configuration Name","value":1000}
    ]
}

## sankey.js
d3.sankey = function() {
  var sankey = {},
      nodeWidth = 24,
      nodePadding = 8,
      size = [1, 1],
      nodes = [],
      links = [];

  sankey.nodeWidth = function(_) {
    if (!arguments.length) return nodeWidth;
    nodeWidth = +_;
    return sankey;
  };

  sankey.nodePadding = function(_) {
    if (!arguments.length) return nodePadding;
    nodePadding = +_;
    return sankey;
  };

  sankey.nodes = function(_) {
    if (!arguments.length) return nodes;
    nodes = _;
    return sankey;
  };

  sankey.links = function(_) {
    if (!arguments.length) return links;
    links = _;
    return sankey;
  };

  sankey.size = function(_) {
    if (!arguments.length) return size;
    size = _;
    return sankey;
  };

  sankey.layout = function(iterations) {
    computeNodeLinks();
    computeNodeValues();
    computeNodeBreadths();
    computeNodeDepths(iterations);
    computeLinkDepths();
    return sankey;
  };

  sankey.relayout = function() {
    computeLinkDepths();
    return sankey;
  };

  sankey.link = function() {
    var curvature = .5;

    function link(d) {
      var x0 = d.source.x + d.source.dx,
          x1 = d.target.x,
          xi = d3.interpolateNumber(x0, x1),
          x2 = xi(curvature),
          x3 = xi(1 - curvature),
          y0 = d.source.y + d.sy + d.dy / 2,
          y1 = d.target.y + d.ty + d.dy / 2;
      return "M" + x0 + "," + y0
           + "C" + x2 + "," + y0
           + " " + x3 + "," + y1
           + " " + x1 + "," + y1;
    }

    link.curvature = function(_) {
      if (!arguments.length) return curvature;
      curvature = +_;
      return link;
    };

    return link;
  };

  // Populate the sourceLinks and targetLinks for each node.
  // Also, if the source and target are not objects, assume they are indices.
  function computeNodeLinks() {
    nodes.forEach(function(node) {
      node.sourceLinks = [];
      node.targetLinks = [];
    });
    links.forEach(function(link) {
      var source = link.source,
          target = link.target;
      if (typeof source === "number") source = link.source = nodes[link.source];
      if (typeof target === "number") target = link.target = nodes[link.target];
      source.sourceLinks.push(link);
      target.targetLinks.push(link);
    });
  }

  // Compute the value (size) of each node by summing the associated links.
  function computeNodeValues() {
    nodes.forEach(function(node) {
      node.value = Math.max(
        d3.sum(node.sourceLinks, value),
        d3.sum(node.targetLinks, value)
      );
    });
  }

  // Iteratively assign the breadth (x-position) for each node.
  // Nodes are assigned the maximum breadth of incoming neighbors plus one;
  // nodes with no incoming links are assigned breadth zero, while
  // nodes with no outgoing links are assigned the maximum breadth.
  function computeNodeBreadths() {
    var remainingNodes = nodes,
        nextNodes,
        x = 0;

    while (remainingNodes.length) {
      nextNodes = [];
      remainingNodes.forEach(function(node) {
        node.x = x;
        node.dx = nodeWidth;
        node.sourceLinks.forEach(function(link) {
          nextNodes.push(link.target);
        });
      });
      remainingNodes = nextNodes;
      ++x;
    }

    //
    moveSinksRight(x);
    scaleNodeBreadths((size[0] - nodeWidth) / (x - 1));
  }

  function moveSourcesRight() {
    nodes.forEach(function(node) {
      if (!node.targetLinks.length) {
        node.x = d3.min(node.sourceLinks, function(d) { return d.target.x; }) - 1;
      }
    });
  }

  function moveSinksRight(x) {
    nodes.forEach(function(node) {
      if (!node.sourceLinks.length && node.kind === "output") {
        node.x = x - 1;
      }
    });
  }

  function scaleNodeBreadths(kx) {
    nodes.forEach(function(node) {
      node.x *= kx;
    });
  }

  function computeNodeDepths(iterations) {

    var nodesByBreadth = d3.nest()
        .key(function(d) { return d.x; })
        .sortKeys(d3.ascending)
        .entries(nodes)
        .map(function(d) { return d.values; });

    console.log(nodesByBreadth)
    //
    initializeNodeDepth();
    resolveCollisions();
    for (var alpha = 1; iterations > 0; --iterations) {
      relaxRightToLeft(alpha *= .99);
      resolveCollisions();
      relaxLeftToRight(alpha);
      resolveCollisions();
    }

    function initializeNodeDepth() {
      var ky = d3.min(nodesByBreadth, function(nodes) {
        return (size[1] - (nodes.length - 1) * nodePadding) / d3.sum(nodes, value);
      });

      nodesByBreadth.forEach(function(nodes) {
        nodes.forEach(function(node, i) {
          node.y = i;
          node.dy = node.value * ky;
        });
      });

      links.forEach(function(link) {
        link.dy = link.value * ky;
      });
    }

    function relaxLeftToRight(alpha) {
      nodesByBreadth.forEach(function(nodes, breadth) {
        nodes.forEach(function(node) {
          if (node.targetLinks.length) {
            var y = d3.sum(node.targetLinks, weightedSource) / d3.sum(node.targetLinks, value);
            node.y += (y - center(node)) * alpha;
          }
        });
      });

      function weightedSource(link) {
        return center(link.source) * link.value;
      }
    }

    function relaxRightToLeft(alpha) {
      nodesByBreadth.slice().reverse().forEach(function(nodes) {
        nodes.forEach(function(node) {
          if (node.sourceLinks.length) {
            var y = d3.sum(node.sourceLinks, weightedTarget) / d3.sum(node.sourceLinks, value);
            node.y += (y - center(node)) * alpha;
          }
        });
      });

      function weightedTarget(link) {
        return center(link.target) * link.value;
      }
    }

    function resolveCollisions() {
      nodesByBreadth.forEach(function(nodes) {
        var node,
            dy,
            y0 = 0,
            n = nodes.length,
            i;

        // Push any overlapping nodes down.
        nodes.sort(ascendingDepth);
        for (i = 0; i < n; ++i) {
          node = nodes[i];
          dy = y0 - node.y;
          if (dy > 0) node.y += dy;
          y0 = node.y + node.dy + nodePadding;
        }

        // If the bottommost node goes outside the bounds, push it back up.
        dy = y0 - nodePadding - size[1];
        if (dy > 0) {
          y0 = node.y -= dy;

          // Push any overlapping nodes back up.
          for (i = n - 2; i >= 0; --i) {
            node = nodes[i];
            dy = node.y + node.dy + nodePadding - y0;
            if (dy > 0) node.y -= dy;
            y0 = node.y;
          }
        }
      });
    }

    function ascendingDepth(a, b) {
      return a.y - b.y;
    }
  }

  function computeLinkDepths() {
    nodes.forEach(function(node) {
      node.sourceLinks.sort(ascendingTargetDepth);
      node.targetLinks.sort(ascendingSourceDepth);
    });
    nodes.forEach(function(node) {
      var sy = 0, ty = 0;
      node.sourceLinks.forEach(function(link) {
				if (node.targetLinks.length === 1)
          sy += Math.floor((node.dy - link.dy) / 2);
        link.sy = sy;
        sy += link.dy;
      });
      node.targetLinks.forEach(function(link) {
        link.ty = ty;
        ty += link.dy;
      });
    });

    function ascendingSourceDepth(a, b) {
      return a.source.y - b.source.y;
    }

    function ascendingTargetDepth(a, b) {
      return a.target.y - b.target.y;
    }
  }

  function center(node) {
    return node.y + node.dy / 2;
  }

  function value(link) {
    return link.value;
  }

  return sankey;
};

## sankeygreenhouse.json
{
   "nodes":[
       {"name":"Android - SDK","kind":"input"},
    {"name":"iOS - SDK","kind":"input"},
    {"name":"Javascript - SDK","kind":"input"},
    {"name":"Braze - S2S","kind":"input"},
       {"name":"Input Rules","kind":"middle", "width": 70},
       {"name":"Transformations","kind":"middle", "width": 70},
       {"name":"TransformationS","kind":"middle", "width": 70},
       {"name":"TransformatiOns","kind":"middle", "width": 70},
       {"name":"Output Rules","kind":"middle", "width": 70},
       {"name":"Appsflyer - Default Configuration","kind":"output"},
       {"name":"Braze - Default Configuration","kind":"output"},
       {"name":"Braze - Marketing Configuration","kind":"output"},
       {"name":"Mixpanel - Default Configuration","kind":"output"},
       {"name":"Amazon Kinesis Firehose - Default Configuration","kind":"output"},
       {"name":"Facebook - Configuration Name","kind":"output"}
   ],
    "links":[
       {"source":"Android - SDK","target":"Input Rules","value":20000},
       {"source":"Input Rules","target":"Transformations","value":9000},
        {"source":"Input Rules","target":"TransformationS","value":6000},
       {"source":"Input Rules","target":"TransformatiOns","value":1000},
       {"source":"Input Rules","target":"Braze - Marketing Configuration","value":4000},
       {"source":"Transformations","target":"Output Rules","value":1500},
       {"source":"Output Rules","target":"Appsflyer - Default Configuration","value":1000},
     {"source":"TransformationS","target":"Braze - Default Configuration","value":5000},
    {"source":"TransformatiOns","target":"Facebook - Configuration Name","value":500}
   ]
}

## SixTargets.json
{
    "nodes":[
        {"name":"Android - SDK","kind":"input"},
	{"name":"iOS - SDK","kind":"input"},
	{"name":"Javascript - SDK","kind":"input"},
	{"name":"Braze - S2S","kind":"input"},
        {"name":"Input Rules","kind":"middle"},
        {"name":"Transformations1","kind":"middle"},
        {"name":"Transformations2","kind":"middle"},
        {"name":"Transformations3","kind":"middle"},
        {"name":"Transformations4","kind":"middle"},
        {"name":"Output Rules","kind":"middle"},
        {"name":"Amazon Kinesis Firehose - Default Configuration","kind":"output"},
       {"name":"Appsflyer - Default Configuration","kind":"output"},
        {"name":"Braze - Default Configuration","kind":"output"},
        {"name":"Braze - Marketing Configuration","kind":"output"},
        {"name":"Facebook - Configuration Name","kind":"output"},
        {"name":"Mixpanel - Default Configuration","kind":"output"}
    ],
     "links":[
        {"source":"Android - SDK","target":"Input Rules","value":20000},
        {"source":"Input Rules","target":"Transformations1","value":9000},
         {"source":"Input Rules","target":"Transformations2","value":6000},
        {"source":"Input Rules","target":"Transformations3","value":1000},
         {"source":"Input Rules","target":"Transformations4","value":12000},
        {"source":"Input Rules","target":"Braze - Marketing Configuration","value":4000},
        {"source":"Transformations1","target":"Output Rules","value":1500},
        {"source":"Output Rules","target":"Appsflyer - Default Configuration","value":1000},
	 {"source":"Transformations2","target":"Braze - Default Configuration","value":5000},
	 {"source":"Transformations3","target":"Facebook - Configuration Name","value":500},
	 {"source":"Transformations4","target":"Amazon Kinesis Firehose - Default Configuration","value":9000},
        {"source":"Input Rules","target":"Mixpanel - Default Configuration","value":2000}
    ]
}

## WithRules.json
{
    "nodes":[
        {"name":"Android - SDK","kind":"input"},
	{"name":"iOS - SDK","kind":"input"},
	{"name":"Javascript - SDK","kind":"input"},
	{"name":"Braze - S2S","kind":"input"},
        {"name":"Input Rules","kind":"middle"},
        {"name":"Transformations1","kind":"middle"},
        {"name":"Transformations2","kind":"middle"},
        {"name":"Transformations3","kind":"middle"},
        {"name":"Output Rules","kind":"middle"},
        {"name":"Amazon Kinesis Firehose - Default Configuration","kind":"output"},
        {"name":"Appsflyer - Default Configuration","kind":"output"},
        {"name":"Braze - Default Configuration","kind":"output"},
        {"name":"Braze - Marketing Configuration","kind":"output"},
        {"name":"Facebook - Configuration Name","kind":"output"},
        {"name":"Mixpanel - Default Configuration","kind":"output"}
    ],
     "links":[
        {"source":"Android - SDK","target":"Input Rules","value":20000},
        {"source":"Input Rules","target":"Transformations1","value":9000},
         {"source":"Input Rules","target":"Transformations2","value":6000},
        {"source":"Input Rules","target":"Transformations3","value":1000},
        {"source":"Input Rules","target":"Braze - Marketing Configuration","value":4000},
        {"source":"Transformations1","target":"Output Rules","value":1500},
        {"source":"Output Rules","target":"Appsflyer - Default Configuration","value":1000},
	 {"source":"Transformations2","target":"Braze - Default Configuration","value":5000},
	{"source":"Transformations3","target":"Facebook - Configuration Name","value":500}
    ]
}
	<!DOCTYPE html>
	<meta charset="utf-8">
	<title>SANKEY Experiment</title>
	<style>

	.node rect {
	cursor: move;
	fill-opacity: 1;

	stroke-width: 0;
	}

	.node text {
	pointer-events: none;
	text-shadow: 0 1px 0 #fff;
	fill: white;
	}

	.link {
	fill: none;
	stroke: #7ef7d9;
	stroke: linear-gradient(to left, #009487 3%, #7ef7d9);
	stroke-opacity: .8;
	}

	.link:hover {
	stroke-opacity: 1;
	}

	</style>
	<body>
	<p id="chart">

	<script src="http://d3js.org/d3.v3.js"></script>
	<script src="sankey.js"></script>
	<script>

	var units = "Widgets";
	var smallWidth = 30;
	var bigWidth = 170;
	var margin = {top: 10, right: 10, bottom: 10, left: 10},
	width = 800,
	height = 500;

	var formatNumber = d3.format(",.0f"), // zero decimal places
	format = function(d) { return formatNumber(d) + " " + units; },
	color = d3.scale.category20();

	// append the svg canvas to the page
	var svg = d3.select("#chart").append("svg")
	.attr("width", width + 180)
	.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()
	.nodePadding(10)
	.size([width, height]);

	var path = sankey.link();

	// load the data
	d3.json("WithRules.json", function(error, graph) {

	var nodeMap = {};
	graph.nodes.forEach(function(x) { nodeMap[x.name] = x; });
	graph.links = graph.links.map(function(x) {
	return {
	source: nodeMap[x.source],
	target: nodeMap[x.target],
	value: x.value
	};
	});

	sankey
	.nodes(graph.nodes)
	.links(graph.links)
	.layout(0);

	// 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); })
	.attr("fill", "none")
	.sort(function(a, b) { return b.dy - a.dy; });

	// add gradient to links

	// add the link titles
	link.append("title")
	.text(function(d) {
	return d.source.name + " → " +
	d.target.name + "\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.behavior.drag()
	.origin(function(d) { return d; })
	.on("dragstart", function() {
	this.parentNode.appendChild(this); })
	.on("drag", dragmove));



	// add the rectangles for the nodes
	console.log(node);
	node.append("rect")
	.attr('x', (d) => {
	return d.x0
	})
	.attr('y', (d) => {
	return d.y0
	})
	.attr('width', (d) => {
	return d.kind == "middle" ? smallWidth : bigWidth;
	})
	.attr("height", function(d) { return d.dy \|\| 100; })
	.style("fill", function(d) {
	return d.kind !== "middle" ? "black" : '#EBEFF2';
	return d.color = color(d.name.replace(/ .*/, "")); })

	.append("title")
	.text(function(d) {
	return d.name + "\n" + format(d.value); });

	// add in the title for the nodes
	node.append("text")
	.attr("y", function(d) { return d.dy > 20 ? (d.dy / 2) - 10 : 0; })
	.attr("dy", ".85em")
	.attr("text-anchor", "end")
	.attr("transform", null)
	.text((d) => { return d.kind != "middle" ? d.name : ''; })
	.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 = Math.max(0, Math.min(width - d.dx, d3.event.x))
	) + "," + (
	d.y = Math.max(0, Math.min(height - d.dy, d3.event.y))
	) + ")");
	sankey.relayout();
	link.attr("d", path);
	}
	});

	</script>

	</body>
	</html>
	{
	"nodes":[
	{"name":"Android - SDK","kind":"input"},
	{"name":"iOS - SDK","kind":"input"},
	{"name":"Javascript - SDK","kind":"input"},
	{"name":"Braze - S2S","kind":"input"},
	{"name":"Amazon Kinesis Firehose - Default Configuration","kind":"output"},
	{"name":"Appsflyer - Default Configuration","kind":"output"},
	{"name":"Braze - Default Configuration","kind":"output"},
	{"name":"Braze - Marketing Configuration","kind":"output"},
	{"name":"Facebook - Configuration Name","kind":"output"},
	{"name":"Mixpanel - Default Configuration","kind":"output"}
	],
	"links":[
	{"source":"Android - SDK","target":"Braze - Marketing Configuration","value":4000},
	{"source":"Android - SDK","target":"Appsflyer - Default Configuration","value":9000},
	{"source":"Android - SDK","target":"Braze - Default Configuration","value":6000},
	{"source":"Android - SDK","target":"Facebook - Configuration Name","value":1000}
	]
	}
	d3.sankey = function() {
	var sankey = {},
	nodeWidth = 24,
	nodePadding = 8,
	size = [1, 1],
	nodes = [],
	links = [];

	sankey.nodeWidth = function(_) {
	if (!arguments.length) return nodeWidth;
	nodeWidth = +_;
	return sankey;
	};

	sankey.nodePadding = function(_) {
	if (!arguments.length) return nodePadding;
	nodePadding = +_;
	return sankey;
	};

	sankey.nodes = function(_) {
	if (!arguments.length) return nodes;
	nodes = _;
	return sankey;
	};

	sankey.links = function(_) {
	if (!arguments.length) return links;
	links = _;
	return sankey;
	};

	sankey.size = function(_) {
	if (!arguments.length) return size;
	size = _;
	return sankey;
	};

	sankey.layout = function(iterations) {
	computeNodeLinks();
	computeNodeValues();
	computeNodeBreadths();
	computeNodeDepths(iterations);
	computeLinkDepths();
	return sankey;
	};

	sankey.relayout = function() {
	computeLinkDepths();
	return sankey;
	};

	sankey.link = function() {
	var curvature = .5;

	function link(d) {
	var x0 = d.source.x + d.source.dx,
	x1 = d.target.x,
	xi = d3.interpolateNumber(x0, x1),
	x2 = xi(curvature),
	x3 = xi(1 - curvature),
	y0 = d.source.y + d.sy + d.dy / 2,
	y1 = d.target.y + d.ty + d.dy / 2;
	return "M" + x0 + "," + y0
	+ "C" + x2 + "," + y0
	+ " " + x3 + "," + y1
	+ " " + x1 + "," + y1;
	}

	link.curvature = function(_) {
	if (!arguments.length) return curvature;
	curvature = +_;
	return link;
	};

	return link;
	};

	// Populate the sourceLinks and targetLinks for each node.
	// Also, if the source and target are not objects, assume they are indices.
	function computeNodeLinks() {
	nodes.forEach(function(node) {
	node.sourceLinks = [];
	node.targetLinks = [];
	});
	links.forEach(function(link) {
	var source = link.source,
	target = link.target;
	if (typeof source === "number") source = link.source = nodes[link.source];
	if (typeof target === "number") target = link.target = nodes[link.target];
	source.sourceLinks.push(link);
	target.targetLinks.push(link);
	});
	}

	// Compute the value (size) of each node by summing the associated links.
	function computeNodeValues() {
	nodes.forEach(function(node) {
	node.value = Math.max(
	d3.sum(node.sourceLinks, value),
	d3.sum(node.targetLinks, value)
	);
	});
	}

	// Iteratively assign the breadth (x-position) for each node.
	// Nodes are assigned the maximum breadth of incoming neighbors plus one;
	// nodes with no incoming links are assigned breadth zero, while
	// nodes with no outgoing links are assigned the maximum breadth.
	function computeNodeBreadths() {
	var remainingNodes = nodes,
	nextNodes,
	x = 0;

	while (remainingNodes.length) {
	nextNodes = [];
	remainingNodes.forEach(function(node) {
	node.x = x;
	node.dx = nodeWidth;
	node.sourceLinks.forEach(function(link) {
	nextNodes.push(link.target);
	});
	});
	remainingNodes = nextNodes;
	++x;
	}

	//
	moveSinksRight(x);
	scaleNodeBreadths((size[0] - nodeWidth) / (x - 1));
	}

	function moveSourcesRight() {
	nodes.forEach(function(node) {
	if (!node.targetLinks.length) {
	node.x = d3.min(node.sourceLinks, function(d) { return d.target.x; }) - 1;
	}
	});
	}

	function moveSinksRight(x) {
	nodes.forEach(function(node) {
	if (!node.sourceLinks.length && node.kind === "output") {
	node.x = x - 1;
	}
	});
	}

	function scaleNodeBreadths(kx) {
	nodes.forEach(function(node) {
	node.x *= kx;
	});
	}

	function computeNodeDepths(iterations) {

	var nodesByBreadth = d3.nest()
	.key(function(d) { return d.x; })
	.sortKeys(d3.ascending)
	.entries(nodes)
	.map(function(d) { return d.values; });

	console.log(nodesByBreadth)
	//
	initializeNodeDepth();
	resolveCollisions();
	for (var alpha = 1; iterations > 0; --iterations) {
	relaxRightToLeft(alpha *= .99);
	resolveCollisions();
	relaxLeftToRight(alpha);
	resolveCollisions();
	}

	function initializeNodeDepth() {
	var ky = d3.min(nodesByBreadth, function(nodes) {
	return (size[1] - (nodes.length - 1) * nodePadding) / d3.sum(nodes, value);
	});

	nodesByBreadth.forEach(function(nodes) {
	nodes.forEach(function(node, i) {
	node.y = i;
	node.dy = node.value * ky;
	});
	});

	links.forEach(function(link) {
	link.dy = link.value * ky;
	});
	}

	function relaxLeftToRight(alpha) {
	nodesByBreadth.forEach(function(nodes, breadth) {
	nodes.forEach(function(node) {
	if (node.targetLinks.length) {
	var y = d3.sum(node.targetLinks, weightedSource) / d3.sum(node.targetLinks, value);
	node.y += (y - center(node)) * alpha;
	}
	});
	});

	function weightedSource(link) {
	return center(link.source) * link.value;
	}
	}

	function relaxRightToLeft(alpha) {
	nodesByBreadth.slice().reverse().forEach(function(nodes) {
	nodes.forEach(function(node) {
	if (node.sourceLinks.length) {
	var y = d3.sum(node.sourceLinks, weightedTarget) / d3.sum(node.sourceLinks, value);
	node.y += (y - center(node)) * alpha;
	}
	});
	});

	function weightedTarget(link) {
	return center(link.target) * link.value;
	}
	}

	function resolveCollisions() {
	nodesByBreadth.forEach(function(nodes) {
	var node,
	dy,
	y0 = 0,
	n = nodes.length,
	i;

	// Push any overlapping nodes down.
	nodes.sort(ascendingDepth);
	for (i = 0; i < n; ++i) {
	node = nodes[i];
	dy = y0 - node.y;
	if (dy > 0) node.y += dy;
	y0 = node.y + node.dy + nodePadding;
	}

	// If the bottommost node goes outside the bounds, push it back up.
	dy = y0 - nodePadding - size[1];
	if (dy > 0) {
	y0 = node.y -= dy;

	// Push any overlapping nodes back up.
	for (i = n - 2; i >= 0; --i) {
	node = nodes[i];
	dy = node.y + node.dy + nodePadding - y0;
	if (dy > 0) node.y -= dy;
	y0 = node.y;
	}
	}
	});
	}

	function ascendingDepth(a, b) {
	return a.y - b.y;
	}
	}

	function computeLinkDepths() {
	nodes.forEach(function(node) {
	node.sourceLinks.sort(ascendingTargetDepth);
	node.targetLinks.sort(ascendingSourceDepth);
	});
	nodes.forEach(function(node) {
	var sy = 0, ty = 0;
	node.sourceLinks.forEach(function(link) {
	if (node.targetLinks.length === 1)
	sy += Math.floor((node.dy - link.dy) / 2);
	link.sy = sy;
	sy += link.dy;
	});
	node.targetLinks.forEach(function(link) {
	link.ty = ty;
	ty += link.dy;
	});
	});

	function ascendingSourceDepth(a, b) {
	return a.source.y - b.source.y;
	}

	function ascendingTargetDepth(a, b) {
	return a.target.y - b.target.y;
	}
	}

	function center(node) {
	return node.y + node.dy / 2;
	}

	function value(link) {
	return link.value;
	}

	return sankey;
	};