angelicahl88/.block

## .block
license: gpl-3.0

## README.md

      
    Raw
  

              README.md
            
          
    Built with blockbuilder.org
Example of a responsive resumé sankey diagram with hover effect.

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

    div.vis {
      width: 80%;
      height:700;
      margin: 0 auto;
    }

    text {
      fill: #294a51;
      font-family: Monospace;
      font-size: 11px;
      pointer-events: none; }
      text.active {
        letter-spacing: 1.2px;
        font-weight: 700;
        text-transform: uppercase; }
      @media screen and (min-width: 768px) {
        text {
          font-size: 12px; } }

    .link {
      fill: none;
      stroke: #e9e9e9;
      stroke-opacity: 1;
      transition: all 0.3s ease-in-out; }
      .link.active {
        transition: all 0.3s ease-in-out;
        stroke-opacity: 0.4; }
        .link.active#link3 {
          stroke: #7a6364; }
        .link.active#link1 {
          stroke: #7a7863; }
        .link.active#link2 {
          stroke: #a2846a; }
        .link.active#link0 {
          stroke: #294a51; }
      .link.inactive {
        stroke-opacity: 0.3;
        transition: all 0.3s ease-in-out; }

    rect {
      fill: #55605a;
      stroke-width: 3px; }
      rect#id3 {
        fill: #7a6364; }
      rect#id1 {
        fill: #7a7863; }
      rect#id2 {
        fill: #a2846a; }
      rect#id0 {
        fill: #294a51; }
      rect:hover {
        cursor: pointer; }
      </style>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>
  <script src="https://d3js.org/d3.v3.min.js"></script>
  <script src="https://d3js.org/queue.v1.min.js"></script>
	<script src="sankey.js"></script>
</head>

<body>

  <div class="vis">
  	<div id="sankey"></div>
  </div>

  <script>

    $(document).ready(function(){


    //global variables
    var $vis = $('.vis');
    var width = $vis.width();
    var sankeyH;

    //check for window width to set sankeyH, width, innerR, outerR
    if ($(window).width() >= 768) {

        sankeyH = 600;
    } else {
        sankeyH = 450;
    }


    /****************    SVG's setup      ****************/
    //append SVG to #sankey
    var sankeySVG = d3.select('#sankey').append('svg')
        .attr({
            width: width,
            height: sankeyH
        });

    //append g to sankeySVG
    var sankeyG = sankeySVG.append('g')
        .attr({
            class: 'sankeyG'
        });


    /****************  Sankey setup    ****************/

    var sankeyGraph;
    var node;
    var link;
    var rect;

    // Set the sankey diagram properties
    var sankey = d3.sankey()
        .nodeWidth(10)
        .nodePadding(10)
        .size([width, sankeyH]);

    var sankeyPath = sankey.link();

    //queue data
    queue()
        .defer(d3.json, 'sankey.json')
        .await(pushData);


    //load data
    function pushData(error, sankeyData) {

        if (error) throw error;

        //Update global variable with sankeyData
        sankeyGraph = sankeyData;
        //draw sankey
        drawSankey();

    };


    /****************   Draw Sankey   ****************/

    //draw sankey
    function drawSankey() {

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

        // add in the links
        link = sankeySVG.append('g').selectAll(".link")
            .data(sankeyGraph.links)
            .enter().append("path")
            .attr({
                class: 'link',
                d: sankeyPath,
                id: function(d) {
                    return 'link' + d.source.node;
                }
            })
            .style({
                'stroke-width': 2,
                'stroke-dasharray': '2,2'
            })
            .sort(function(a, b) { return b.dy - a.dy; });


        // add in the nodes
        node = sankeySVG.append('g').selectAll(".node")
            .data(sankeyGraph.nodes)
            .enter().append("g")
            .attr({
                class: 'node',
                transform: function(d) {
                    return "translate(" + d.x + "," + d.y + ")";
                }
            });

        //append rectangles to nodes
        rect = node.append("rect")
            .attr({
                height: function(d) {
                    return d.dy;
                },
                width: sankey.nodeWidth(),
                rx: 5,
                ry: 5,
                id: function(d, i) {
                    return 'id' + i;
                }
            })
            .on('mouseover', function(d) {

                //check if source or target of link are same as hovered node and set class active/inactive
                d3.selectAll('.link').classed('active', function(p) {
                    return p.source === d || p.target === d;
                });
                d3.selectAll('.link').classed('inactive', function(p) {
                    return p.source !== d && p.target !== d;
                });


                //text variables
                var nodeId = 'textId' + d.node;
                var sourceLength = d.sourceLinks.length;
                var targetLength = d.targetLinks.length;

                //set active class on text node of hovered element
                $('text#' + nodeId).addClass('active');

                //loop through source and target links to set active class on text
                if (sourceLength !== 0) {
                   for (var i = 0; i < sourceLength; i++) {
                       var tNodeId = 'textId' + d.sourceLinks[i].target.node;

                       $('text#' + tNodeId).addClass('active');
                    }
                } else if (targetLength !== 0) {
                    for (var i = 0; i < targetLength; i++) {
                        var tNodeId = 'textId' + d.targetLinks[i].source.node;

                       $('text#' + tNodeId).addClass('active');
                    }
                }

                //set hovered node as class active
                d3.select(this).classed('active', true);


            })
            .on('mouseout', function(d) {

                //remove active and inactive classes
                d3.selectAll('.active').classed('active', false);
                d3.selectAll('.inactive').classed('inactive', false);

            });

        //Append text to node
        node
            .append("text")
            .attr({
                x: -20,
                y: function(d) {
                    return d.dy / 3 * 2;
                },
                dy: '.01em',
                'text-anchor': 'end',
                id: function(d) {
                    return 'textId' + d.node;
                }
            })
            .text(function(d) { return d.name; })
            .filter(function(d) {
                return d.x < width / 2;
            })
            .attr({
                y: function(d) {
                    return d.dy / 2;
                },
                x: 6 + sankey.nodeWidth(),
                'text-anchor': 'start'
            });

    }

    /****************    RESIZE FUNCTION     ****************/

    $(window).resize(function() {

        width = $vis.width();;

        //check for window width to set sankeyH, width, innerR, outerR
        if ($(window).width() >= 768) {
            sankeyH = 600;
        } else {
            sankeyH = 450;
        }


        //update vis SVG's height and width
        sankeySVG
            .attr({width: width, height: sankeyH});

        //update sankey width
        sankey
            .size([width, sankeyH]);

        //reset sankey
        sankey
            .nodes(sankeyGraph.nodes)
            .links(sankeyGraph.links)
            .layout(32);

        //Update node positioning
        node
            .attr("transform", function(d) {
                return "translate(" + d.x + "," + d.y + ")";
            });

        //Update rect height
        d3.selectAll('rect')
            .attr("height", function(d) { return d.dy;
            });

        //update links
        link
            .attr("d", sankeyPath);

        //update text positioning
        d3.selectAll('text')
            .attr({
                y: function(d) {
                    return d.dy / 3 * 2;
                }
            });

        d3.selectAll('text')
            .filter(function(d) {
                return d.x < width / 2;
            })
            .attr({
                y: function(d) {
                    return d.dy / 2;
                }
            });


    	});     //end function resize

    });


  </script>
</body>

## 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;
};

## sankey.json
{
    "nodes": [
        {"node": 0, "name": "Web Development"},
        {"node": 1, "name": "Geospatial"},
        {"node": 2, "name": "Design"},
        {"node": 3, "name": "Data Management"},
        {"node": 4, "name": "AngularJS"},
        {"node": 5, "name": "D3.js"},
        {"node": 6, "name": "Leaflet"},
        {"node": 7, "name": "CSS3"},
        {"node": 8, "name": "HTML5"},
        {"node": 9, "name": "Javascript"},
        {"node": 10, "name": "jQuery"},
        {"node": 11, "name": "PHP"},
        {"node": 12, "name": "Sass"},
        {"node": 13, "name": "GRASS GIS"},
        {"node": 14, "name": "PCI Geomatica"},
        {"node": 15, "name": "QGIS"},
        {"node": 16, "name": "CartoCSS"},
        {"node": 17, "name": "PostGIS"},
        {"node": 18, "name": "PostgreSQL"},
        {"node": 19, "name": "Adobe Illustrator"},
        {"node": 20, "name": "Adobe Indesign"},
        {"node": 21, "name": "OpenLayers"}
    ],
    "links": [
        {"source": 0, "target": 4, "value": 3},
        {"source": 0, "target": 5, "value": 3},
        {"source": 0, "target": 6, "value": 3},
        {"source": 0, "target": 7, "value": 3},
        {"source": 0, "target": 8, "value": 3},
        {"source": 0, "target": 9, "value": 3},
        {"source": 0, "target": 10, "value": 3},
        {"source": 0, "target": 11, "value": 3},
        {"source": 0, "target": 12, "value": 3},
        {"source": 0, "target": 16, "value": 3},
        {"source": 0, "target": 21, "value": 3},
        {"source": 1, "target": 13, "value": 4},
        {"source": 1, "target": 14, "value": 4},
        {"source": 1, "target": 15, "value": 4},
        {"source": 1, "target": 16, "value": 4},
        {"source": 1, "target": 17, "value": 4},
        {"source": 1, "target": 18, "value": 4},
        {"source": 1, "target": 21, "value": 4},
        {"source": 2, "target": 16, "value": 5},
        {"source": 2, "target": 19, "value": 5},
        {"source": 2, "target": 20, "value": 5},
        {"source": 3, "target": 21, "value": 5},
        {"source": 3, "target": 17, "value": 6},
        {"source": 3, "target": 18, "value": 6}
    ]
}
	<!DOCTYPE html>
	<head>
	<meta charset="utf-8">
	<style>

	div.vis {
	width: 80%;
	height:700;
	margin: 0 auto;
	}

	text {
	fill: #294a51;
	font-family: Monospace;
	font-size: 11px;
	pointer-events: none; }
	text.active {
	letter-spacing: 1.2px;
	font-weight: 700;
	text-transform: uppercase; }
	@media screen and (min-width: 768px) {
	text {
	font-size: 12px; } }

	.link {
	fill: none;
	stroke: #e9e9e9;
	stroke-opacity: 1;
	transition: all 0.3s ease-in-out; }
	.link.active {
	transition: all 0.3s ease-in-out;
	stroke-opacity: 0.4; }
	.link.active#link3 {
	stroke: #7a6364; }
	.link.active#link1 {
	stroke: #7a7863; }
	.link.active#link2 {
	stroke: #a2846a; }
	.link.active#link0 {
	stroke: #294a51; }
	.link.inactive {
	stroke-opacity: 0.3;
	transition: all 0.3s ease-in-out; }

	rect {
	fill: #55605a;
	stroke-width: 3px; }
	rect#id3 {
	fill: #7a6364; }
	rect#id1 {
	fill: #7a7863; }
	rect#id2 {
	fill: #a2846a; }
	rect#id0 {
	fill: #294a51; }
	rect:hover {
	cursor: pointer; }
	</style>
	<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>
	<script src="https://d3js.org/d3.v3.min.js"></script>
	<script src="https://d3js.org/queue.v1.min.js"></script>
	<script src="sankey.js"></script>
	</head>

	<body>

	<div class="vis">
	<div id="sankey"></div>
	</div>

	<script>

	$(document).ready(function(){



	//global variables
	var $vis = $('.vis');
	var width = $vis.width();
	var sankeyH;

	//check for window width to set sankeyH, width, innerR, outerR
	if ($(window).width() >= 768) {

	sankeyH = 600;
	} else {
	sankeyH = 450;
	}


	/************** SVG's setup **************/
	//append SVG to #sankey
	var sankeySVG = d3.select('#sankey').append('svg')
	.attr({
	width: width,
	height: sankeyH
	});

	//append g to sankeySVG
	var sankeyG = sankeySVG.append('g')
	.attr({
	class: 'sankeyG'
	});


	/************** Sankey setup **************/

	var sankeyGraph;
	var node;
	var link;
	var rect;

	// Set the sankey diagram properties
	var sankey = d3.sankey()
	.nodeWidth(10)
	.nodePadding(10)
	.size([width, sankeyH]);

	var sankeyPath = sankey.link();

	//queue data
	queue()
	.defer(d3.json, 'sankey.json')
	.await(pushData);



	//load data
	function pushData(error, sankeyData) {

	if (error) throw error;

	//Update global variable with sankeyData
	sankeyGraph = sankeyData;
	//draw sankey
	drawSankey();

	};


	/************** Draw Sankey **************/

	//draw sankey
	function drawSankey() {

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

	// add in the links
	link = sankeySVG.append('g').selectAll(".link")
	.data(sankeyGraph.links)
	.enter().append("path")
	.attr({
	class: 'link',
	d: sankeyPath,
	id: function(d) {
	return 'link' + d.source.node;
	}
	})
	.style({
	'stroke-width': 2,
	'stroke-dasharray': '2,2'
	})
	.sort(function(a, b) { return b.dy - a.dy; });


	// add in the nodes
	node = sankeySVG.append('g').selectAll(".node")
	.data(sankeyGraph.nodes)
	.enter().append("g")
	.attr({
	class: 'node',
	transform: function(d) {
	return "translate(" + d.x + "," + d.y + ")";
	}
	});

	//append rectangles to nodes
	rect = node.append("rect")
	.attr({
	height: function(d) {
	return d.dy;
	},
	width: sankey.nodeWidth(),
	rx: 5,
	ry: 5,
	id: function(d, i) {
	return 'id' + i;
	}
	})
	.on('mouseover', function(d) {

	//check if source or target of link are same as hovered node and set class active/inactive
	d3.selectAll('.link').classed('active', function(p) {
	return p.source === d \|\| p.target === d;
	});
	d3.selectAll('.link').classed('inactive', function(p) {
	return p.source !== d && p.target !== d;
	});


	//text variables
	var nodeId = 'textId' + d.node;
	var sourceLength = d.sourceLinks.length;
	var targetLength = d.targetLinks.length;

	//set active class on text node of hovered element
	$('text#' + nodeId).addClass('active');

	//loop through source and target links to set active class on text
	if (sourceLength !== 0) {
	for (var i = 0; i < sourceLength; i++) {
	var tNodeId = 'textId' + d.sourceLinks[i].target.node;

	$('text#' + tNodeId).addClass('active');
	}
	} else if (targetLength !== 0) {
	for (var i = 0; i < targetLength; i++) {
	var tNodeId = 'textId' + d.targetLinks[i].source.node;

	$('text#' + tNodeId).addClass('active');
	}
	}

	//set hovered node as class active
	d3.select(this).classed('active', true);


	})
	.on('mouseout', function(d) {

	//remove active and inactive classes
	d3.selectAll('.active').classed('active', false);
	d3.selectAll('.inactive').classed('inactive', false);

	});

	//Append text to node
	node
	.append("text")
	.attr({
	x: -20,
	y: function(d) {
	return d.dy / 3 * 2;
	},
	dy: '.01em',
	'text-anchor': 'end',
	id: function(d) {
	return 'textId' + d.node;
	}
	})
	.text(function(d) { return d.name; })
	.filter(function(d) {
	return d.x < width / 2;
	})
	.attr({
	y: function(d) {
	return d.dy / 2;
	},
	x: 6 + sankey.nodeWidth(),
	'text-anchor': 'start'
	});

	}

	/************** RESIZE FUNCTION **************/

	$(window).resize(function() {

	width = $vis.width();;

	//check for window width to set sankeyH, width, innerR, outerR
	if ($(window).width() >= 768) {
	sankeyH = 600;
	} else {
	sankeyH = 450;
	}


	//update vis SVG's height and width
	sankeySVG
	.attr({width: width, height: sankeyH});

	//update sankey width
	sankey
	.size([width, sankeyH]);

	//reset sankey
	sankey
	.nodes(sankeyGraph.nodes)
	.links(sankeyGraph.links)
	.layout(32);

	//Update node positioning
	node
	.attr("transform", function(d) {
	return "translate(" + d.x + "," + d.y + ")";
	});

	//Update rect height
	d3.selectAll('rect')
	.attr("height", function(d) { return d.dy;
	});

	//update links
	link
	.attr("d", sankeyPath);

	//update text positioning
	d3.selectAll('text')
	.attr({
	y: function(d) {
	return d.dy / 3 * 2;
	}
	});

	d3.selectAll('text')
	.filter(function(d) {
	return d.x < width / 2;
	})
	.attr({
	y: function(d) {
	return d.dy / 2;
	}
	});



	}); //end function resize

	});


	</script>
	</body>
	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;
	};
	{
	"nodes": [
	{"node": 0, "name": "Web Development"},
	{"node": 1, "name": "Geospatial"},
	{"node": 2, "name": "Design"},
	{"node": 3, "name": "Data Management"},
	{"node": 4, "name": "AngularJS"},
	{"node": 5, "name": "D3.js"},
	{"node": 6, "name": "Leaflet"},
	{"node": 7, "name": "CSS3"},
	{"node": 8, "name": "HTML5"},
	{"node": 9, "name": "Javascript"},
	{"node": 10, "name": "jQuery"},
	{"node": 11, "name": "PHP"},
	{"node": 12, "name": "Sass"},
	{"node": 13, "name": "GRASS GIS"},
	{"node": 14, "name": "PCI Geomatica"},
	{"node": 15, "name": "QGIS"},
	{"node": 16, "name": "CartoCSS"},
	{"node": 17, "name": "PostGIS"},
	{"node": 18, "name": "PostgreSQL"},
	{"node": 19, "name": "Adobe Illustrator"},
	{"node": 20, "name": "Adobe Indesign"},
	{"node": 21, "name": "OpenLayers"}
	],
	"links": [
	{"source": 0, "target": 4, "value": 3},
	{"source": 0, "target": 5, "value": 3},
	{"source": 0, "target": 6, "value": 3},
	{"source": 0, "target": 7, "value": 3},
	{"source": 0, "target": 8, "value": 3},
	{"source": 0, "target": 9, "value": 3},
	{"source": 0, "target": 10, "value": 3},
	{"source": 0, "target": 11, "value": 3},
	{"source": 0, "target": 12, "value": 3},
	{"source": 0, "target": 16, "value": 3},
	{"source": 0, "target": 21, "value": 3},
	{"source": 1, "target": 13, "value": 4},
	{"source": 1, "target": 14, "value": 4},
	{"source": 1, "target": 15, "value": 4},
	{"source": 1, "target": 16, "value": 4},
	{"source": 1, "target": 17, "value": 4},
	{"source": 1, "target": 18, "value": 4},
	{"source": 1, "target": 21, "value": 4},
	{"source": 2, "target": 16, "value": 5},
	{"source": 2, "target": 19, "value": 5},
	{"source": 2, "target": 20, "value": 5},
	{"source": 3, "target": 21, "value": 5},
	{"source": 3, "target": 17, "value": 6},
	{"source": 3, "target": 18, "value": 6}
	]
	}