biovisualize/.block

## .block
license: gpl-3.0

## README.md

      
    Raw
  

              README.md
            
          
    Create a Sankey diagram from a CSV file. I got most of this code from d3noob's block, but I added the code to convert the CSV data into the format required by d3-sankey.
Unlike version 1, this version colors the links according to the source.
forked from HarryStevens's block: Sankey from CSV II
forked from giguerre's block: Sankey from CSV II

  
## data.csv

          
            source
            target
            value

            
              Coal export
              Investors
              66.7

            
              Coal export
              Government
              17

            
              Oil imports
              Investors
              8.1

            
              Oil imports
              Government
              0.2

            
              Metals
              Investors
              0.4

            
              Metals
              Government
              0.1

            
              Domestic_fuels
              Investors
              14.7

            
              Domestic_fuels
              Government
              2.3

            
              Domestic power
              Government
              5

            
              Domestic power
              Consumers
              5

## index.html
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <style>

      body {
        margin: 0;
        font-family: "Helvetica Neue", sans-serif;
      }

      .node rect {
        cursor: move;
        fill-opacity: .9;
        shape-rendering: crispEdges;
      }
      .node text {
        pointer-events: none;
        text-shadow: 0px 0px 2px #fff;
        font-size: .8em;
      }

      .link {
        fill: none;
        stroke: #000;
        stroke-opacity: .5;
      }
      .link:hover {
        stroke-opacity: 1;
      }

    </style>
  </head>
  <body>
    <script src="https://d3js.org/d3.v4.min.js"></script>
    <script src="sankey.js"></script>

    <script>
      // set the dimensions and margins of the graph
      var margin = {top: 10, right: 10, bottom: 10, left: 10},
          width = window.innerWidth - margin.left - margin.right,
          height = window.innerHeight - margin.top - margin.bottom;

      // format variables
      var formatNumber = d3.format(",.0f"),    // zero decimal places
          format = function(d) { return "$" + formatNumber(d); },
          color = d3.scaleOrdinal([
            "#89dfff",
            "#44b2ed",
            "#199ae5",
            "#1dacd7",
            "#add6e0",
            "#b3dad3",
            "#d8f2dc",
            "#e8f1d4"
          ]);

      // append the svg object to the body of the page
      var svg = d3.select("body").append("svg")
          .attr("width", width + margin.left + margin.right)
          .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()
          .nodeWidth(150)
          .nodePadding(height / 10)
          .size([width, height]);

      var path = sankey.link();

      // load the data
      d3.queue()
          .defer(d3.csv, "data.csv")
          .await(ready);

      function ready(error, csv){

        // create an array to push all sources and targets, before making them unique
        var arr = [];
        csv.forEach(function(d){

          arr.push(d.source);
          arr.push(d.target);

        });

        // create nodes array
        var nodes = arr.filter(onlyUnique).map(function(d,i){
          return {
            node: i,
            name: d
          }
        });

        // create links array
        var links = csv.map(function(csv_row){
          return {
            source: getNode("source"),
            target: getNode("target"),
            value: +csv_row.value
          }

          function getNode(type){
            return nodes.filter(function(node_object){ return node_object.name == csv_row[type]; })[0].node;
          }

        });

        sankey
            .nodes(nodes)
            .links(links)
            .layout(32);

        // add in the links
        var link = svg.append("g").selectAll(".link")
            .data(links)
          .enter().append("path")
            .attr("class", "link")
            .attr("d", path)
            .style("stroke", function(d){
              return color(d.source.name.replace(/ .*/, ""));
            })
            .style("stroke-width", function(d) { return Math.max(1, d.dy); })
            .sort(function(a, b) { return b.dy - a.dy; });

        // 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(nodes)
          .enter().append("g")
            .attr("class", "node")
            .attr("transform", function(d) {
              return "translate(" + d.x + "," + d.y + ")";
            })
            .call(d3.drag()
              .subject(function(d) {
                return d;
              })
              .on("start", function() {
                this.parentNode.appendChild(this);
              })
              .on("drag", dragmove));

        // add the rectangles for the nodes
        node.append("rect")
            .attr("height", function(d) { return d.dy < 0 ? .1 : d.dy; })
            .attr("width", sankey.nodeWidth())
            .style("fill", function(d) {
              return d.color = color(d.name.replace(/ .*/, ""));
            })
            .style("stroke", "white")
          .append("title")
            .text(function(d) {
              return d.name + "\n" + format(d.value);
            });

        // add in the title for the nodes
        node.append("text")
            .attr("x", 20)
            .attr("y", function(d) { return d.dy / 2; })
            .attr("dy", ".35em")
            .attr("text-anchor", "start")
            .attr("transform", null)
            .text(function(d) { return d.name + " " + (Math.ceil(d.value * 100) / 100); })
          .filter(function(d) { return d.x < width / 2; })
            .attr("x", 20)
            .attr("text-anchor", "start");

        // the function for moving the nodes
        function dragmove(d) {
          d3.select(this)
            .attr("transform",
                  "translate("
                     + d.x + ","
                     + (d.y = Math.max(
                        0, Math.min(height - d.dy, d3.event.y))
                       ) + ")");
          sankey.relayout();
          link.attr("d", path);
        }

      }

      // unique values of an array
      function onlyUnique(value, index, self) {
          return self.indexOf(value) === index;
      }

    </script>
  </body>
</html>

## 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) {
          if (nextNodes.indexOf(link.target) < 0) {
            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.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; });

    //
    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) {
        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;
};
source	target	value
Coal export	Investors	66.7
Coal export	Government	17
Oil imports	Investors	8.1
Oil imports	Government	0.2
Metals	Investors	0.4
Metals	Government	0.1
Domestic_fuels	Investors	14.7
Domestic_fuels	Government	2.3
Domestic power	Government	5
Domestic power	Consumers	5
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<style>

	body {
	margin: 0;
	font-family: "Helvetica Neue", sans-serif;
	}

	.node rect {
	cursor: move;
	fill-opacity: .9;
	shape-rendering: crispEdges;
	}
	.node text {
	pointer-events: none;
	text-shadow: 0px 0px 2px #fff;
	font-size: .8em;
	}

	.link {
	fill: none;
	stroke: #000;
	stroke-opacity: .5;
	}
	.link:hover {
	stroke-opacity: 1;
	}

	</style>
	</head>
	<body>
	<script src="https://d3js.org/d3.v4.min.js"></script>
	<script src="sankey.js"></script>

	<script>
	// set the dimensions and margins of the graph
	var margin = {top: 10, right: 10, bottom: 10, left: 10},
	width = window.innerWidth - margin.left - margin.right,
	height = window.innerHeight - margin.top - margin.bottom;

	// format variables
	var formatNumber = d3.format(",.0f"), // zero decimal places
	format = function(d) { return "$" + formatNumber(d); },
	color = d3.scaleOrdinal([
	"#89dfff",
	"#44b2ed",
	"#199ae5",
	"#1dacd7",
	"#add6e0",
	"#b3dad3",
	"#d8f2dc",
	"#e8f1d4"
	]);

	// append the svg object to the body of the page
	var svg = d3.select("body").append("svg")
	.attr("width", width + margin.left + margin.right)
	.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()
	.nodeWidth(150)
	.nodePadding(height / 10)
	.size([width, height]);

	var path = sankey.link();

	// load the data
	d3.queue()
	.defer(d3.csv, "data.csv")
	.await(ready);

	function ready(error, csv){

	// create an array to push all sources and targets, before making them unique
	var arr = [];
	csv.forEach(function(d){

	arr.push(d.source);
	arr.push(d.target);

	});

	// create nodes array
	var nodes = arr.filter(onlyUnique).map(function(d,i){
	return {
	node: i,
	name: d
	}
	});

	// create links array
	var links = csv.map(function(csv_row){
	return {
	source: getNode("source"),
	target: getNode("target"),
	value: +csv_row.value
	}

	function getNode(type){
	return nodes.filter(function(node_object){ return node_object.name == csv_row[type]; })[0].node;
	}

	});

	sankey
	.nodes(nodes)
	.links(links)
	.layout(32);

	// add in the links
	var link = svg.append("g").selectAll(".link")
	.data(links)
	.enter().append("path")
	.attr("class", "link")
	.attr("d", path)
	.style("stroke", function(d){
	return color(d.source.name.replace(/ .*/, ""));
	})
	.style("stroke-width", function(d) { return Math.max(1, d.dy); })
	.sort(function(a, b) { return b.dy - a.dy; });

	// 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(nodes)
	.enter().append("g")
	.attr("class", "node")
	.attr("transform", function(d) {
	return "translate(" + d.x + "," + d.y + ")";
	})
	.call(d3.drag()
	.subject(function(d) {
	return d;
	})
	.on("start", function() {
	this.parentNode.appendChild(this);
	})
	.on("drag", dragmove));

	// add the rectangles for the nodes
	node.append("rect")
	.attr("height", function(d) { return d.dy < 0 ? .1 : d.dy; })
	.attr("width", sankey.nodeWidth())
	.style("fill", function(d) {
	return d.color = color(d.name.replace(/ .*/, ""));
	})
	.style("stroke", "white")
	.append("title")
	.text(function(d) {
	return d.name + "\n" + format(d.value);
	});

	// add in the title for the nodes
	node.append("text")
	.attr("x", 20)
	.attr("y", function(d) { return d.dy / 2; })
	.attr("dy", ".35em")
	.attr("text-anchor", "start")
	.attr("transform", null)
	.text(function(d) { return d.name + " " + (Math.ceil(d.value * 100) / 100); })
	.filter(function(d) { return d.x < width / 2; })
	.attr("x", 20)
	.attr("text-anchor", "start");

	// the function for moving the nodes
	function dragmove(d) {
	d3.select(this)
	.attr("transform",
	"translate("
	+ d.x + ","
	+ (d.y = Math.max(
	0, Math.min(height - d.dy, d3.event.y))
	) + ")");
	sankey.relayout();
	link.attr("d", path);
	}

	}

	// unique values of an array
	function onlyUnique(value, index, self) {
	return self.indexOf(value) === index;
	}

	</script>
	</body>
	</html>
	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) {
	if (nextNodes.indexOf(link.target) < 0) {
	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.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; });

	//
	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) {
	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;
	};