saraquigley · August 5, 2020 20:24
diff --git a/Readme.md b/Readme.md
diff --git a/idg_dep.csv b/idg_dep.csv
diff --git a/idg_dep.js b/idg_dep.js
 var duration = 0;
 var units = "Students";

 var margin = {top: 10, right: 100, bottom: 30, left: 100};

 var width=(window.innerWidth-margin.left-margin.right)-200;
 // var width = 700;

 var height=800;

 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 + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
    .append("g")
    .attr("transform",
          "translate(" + margin.left + "," + margin.top + ")");

 svg.append("rect")
    .attr("class", "background")
    .attr("width", width)
    .attr("height", height)
    .on("click", reloadPage);

 var linkset = svg.append("g").attr("id","linkSet");
 // Set the sankey diagram properties
 var state;

 //the names of the columns that will be used in the Sankey.

 var nodeNames = ["target","source"];
 var countName = "value";
 var lastData = [];

 defaultPath = {'x':0};


 var relayout = function(maindata,filter) {

    filter = filter || function() {return true;};
    var data = maindata.filter(filter);
    //dat = data
    //Drop the exiting selections from last time

    var graph = dataToNodeList(data);

    //here is goes.

    //make the new data frame

    var sankey = d3.sankey()
        .nodeWidth(42)
        .nodePadding(8)
        .size([width, height]);

    sankey.nodes(graph.nodes)
        .links(graph.links)
        .layout(12);

    path = sankey.link();

    linkColor = d3.scale.log().domain([0.1,1,10]).range(["red","grey","blue"]);

    //add in the links.

    var link = linkset.selectAll(".link")
        .data(graph.links,function(d) {return d.source.name + "-" + d.target.name;});

    var resetSizeDown = function() {
        height = 800;
 	d3.select("svg").transition().duration(duration).attr("height",window.innerHeight);
        svg.attr("height",800);
        sankey.size([width,height]);
    };

    link.enter()
        .append("path")
        .style("stroke",function(d) {return linkColor(d.diff);})
        .attr("class", "link")
        .attr("d",function(d) {
             try {return path(defaultPath);}
             catch(e) {return path(d);}
           })
        .style("opacity",0)
        .style("stroke-width", function(d) { return Math.max(1, defaultPath.dy); })
        .on("click",function(d) {
            resetSizeDown();
            defaultPath = d;
            relayout(maindata,filter=function(e) {

                // return e.target==d.source.name || e.source==d.source.name || e.target==d.target.name || e.source==d.target.name;
            });
        })
        .append("title")
        .text(function(d) {
            return d.source.name + " majors going into " +
                d.target.name + "\n" + format(d.value); });

    link.transition()
        .duration(duration)
        .style("opacity", 0.9)
        .attr("d",path)
        .style("stroke-width", function(d) { return Math.max(1, d.dy); })
        .sort(function(a, b) { return b.dy - a.dy; });

    link.exit().remove();
    // add the link titles

    // add in the nodes
    var node = svg.selectAll(".node")
        .data(graph.nodes,function(d) {return d.name;});

    entering = node.enter()
        .append("g");


    entering
        .attr("transform", function(d) {
            try {
                d.relative = defaultPath.source.x===d.x?
                    defaultPath.source : defaultPath.target;
            } catch(error) {
 		d.relative = d;
            }
            return "translate(" + d.x + "," + d.relative.y + ")";

 	})
    .attr("class", "node");

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

 entering
    .append("rect")
    .on("click",function(d) {
        resetSizeDown();
        defaultPath = link.filter(function(e) {
            return e.source.name==d.name || e.target.name==d.name;
        }).datum();
 	
    relayout(maindata,filter=function(e) {

                var remainingNodes=[],
                    nextNodes = [],
                    allLinks = [];

                var traverse = [{
                                  linkType : "sourceLinks",
                                  nodeType : "target"
                                },{
                                  linkType : "targetLinks",
                                  nodeType : "source"
                                }];
                
                
                traverse.forEach(function(step){
                      d[step.linkType].forEach(function(link) {
                        remainingNodes.push(link[step.nodeType]);
                        allLinks.push(link[step.nodeType].name);
                      });

                      while (remainingNodes.length) {
                        nextNodes = [];
                        remainingNodes.forEach(function(node) {
                          node[step.linkType].forEach(function(link) {
                            nextNodes.push(link[step.nodeType]);
                            allLinks.push(link[step.nodeType].name);
                          });
                        });
                        remainingNodes = nextNodes;
                      }
                    });
              
            var nodeNames = d3.keys(d3.nest().key(function (d) { return d; }).map(allLinks));

            // intended is clicked
            if (d.name.substring(0,1) == 'i') {
                  return e.source==d.name || (e.target==(nodeNames.indexOf(e.target) > -1 ? nodeNames[nodeNames.indexOf(e.target)] : "") && e.source==(nodeNames.indexOf(e.source) > -1 ? nodeNames[nodeNames.indexOf(e.source)] : ""));
            }
            
            // declared is clicked
            if (d.name.substring(0,1) == 'd') {
                return e.target==d.name || e.source==d.name;
            }

            // degree is clicked
            if (d.name.substring(0,1) == 'g' || d.name.substring(0,1) == 'i') {
                return e.target==d.name || (e.source==(nodeNames.indexOf(e.source) > -1 ? nodeNames[nodeNames.indexOf(e.source)] : "") && e.target==(nodeNames.indexOf(e.target) > -1 ? nodeNames[nodeNames.indexOf(e.target)] : ""));
            }
        });
    })
    .style("fill", function(d) {
        return d.color = divisionColors(d.name.substring(1, d.name.length));})
        // return d.color = color(d.name.replace(/ .*/, "")); })
    .style("stroke", function(d) {
        return d3.rgb(d.color).darker(2); })
    .attr("height", function(d) { return d.relative.dy; })
    .style("opacity",0);

 entering.append("text")
    .attr("class","label")
    .attr("x", -6)
    .attr("dy", ".35em")
    .attr("text-anchor", "end")
    .attr("font-size","11px")
    .attr("transform", null)
    .text(function(d) { return d.name; })
    .filter(function(d) { return d.x < width / 2; })
    .attr("x", 6 + sankey.nodeWidth())
    .attr("text-anchor", "start");

 node.transition()
    .duration(duration)
    .attr("transform", function(d) {
        return "translate(" + d.x + "," + d.y + ")"; });

 // add the rectangles for the nodes
 node.selectAll("rect")
    .transition()
    .duration(duration)
    .style("opacity",1)
    .attr("height", function(d) {return d3.max([2,this.parentNode.__data__.dy]);})
    .attr("width", sankey.nodeWidth());

  d3.selectAll("text.label")
    .transition().duration(duration)
    .attr("y", function(d) { return this.parentNode.__data__.dy / 2; });


 node.exit().remove();
 // add in the title for the nodes

    //longer durations for all the later things.
    duration=2000;
 };
 // load the data
 d3.csv("idg_dep.csv", function(error, data) {
    var dat = data;
    // industries = d3.set(dat.map(function(d) {return d.source.split("-")[0];})).values();
    // industryColors = d3.scale.category20().domain(industries);

    depts = d3.set(dat.map(function(d) {return d.source.substring(1, d.source.length);})).values();
    divisionColors = d3.scale.category20b().domain(depts);
    //from http://www.d3noob.org/2013/02/formatting-data-for-sankey-diagrams-in.html
    relayout(data,filter=function(d) {return true;});
 });



 //functions

 function reloadPage() {

    document.location.reload(true);

 }


 var dataToNodeList = function(data) {
    var graph = {"nodes" : [], "links" : []};
    data.forEach(function (d) {
        // nodeNames.forEach(function(name) {
        //     //add a node for each relevant column
        //     graph.nodes.push({ "name": d[name] });
        // });
        graph.nodes.push({ "name": d.source });
        graph.nodes.push({ "name": d.target });
        graph.links.push({ "source": d.source,
                           "target": d.target,
                           "value": d.count}
                        );
    });
    // return only the distinct / unique nodes
    graph.nodes = d3.keys(d3.nest()
                          .key(function (d) { return d.name; })
                          .map(graph.nodes));

    // loop through each link replacing the text with its index from node
    graph.links.forEach(function (d, i) {
        graph.links[i].source = graph.nodes.indexOf(graph.links[i].source);
        graph.links[i].target = graph.nodes.indexOf(graph.links[i].target);
    });



    //now loop through each nodes to make nodes an array of objects
    // rather than an array of strings
    graph.nodes.forEach(function (d, i) {
        graph.nodes[i] = { "name": d };
    });
    return graph;
 };
diff --git a/index.html b/index.html
 <!DOCTYPE html>
 <meta charset="utf-8">
 <style>
  .node rect {
  cursor: move;
  fill-opacity: .9;
  shape-rendering: crispEdges;
  }
  .node text {
  pointer-events: none;
  text-shadow: 0 1px 0 #fff;
  }
  .link {
  fill: none;
  stroke: #000;
  stroke-opacity: .1;
  }
  .link:hover {
  stroke-opacity: .5;
  }

  body {
    font-family: 'Helvetica Neue', Sans serif;
  }

   rect.background {
  fill: white;
 }
 </style>


 <body>
  <h5>intend --> declare --> degree</h5>
  <p id="chart">
    <script type="text/javascript" src="http://d3js.org/d3.v3.min.js"></script>
    <script src="sankey.js"></script>
    <script src="idg_dep.js">

    </script>

    </body>
 </html>
diff --git a/sankey.js b/sankey.js
 //from Mike Bostock

 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.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;
 };
diff --git a/thumbnail.png b/thumbnail.png
	var duration = 0;
	var units = "Students";

	var margin = {top: 10, right: 100, bottom: 30, left: 100};

	var width=(window.innerWidth-margin.left-margin.right)-200;
	// var width = 700;

	var height=800;

	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 + margin.left + margin.right)
	.attr("height", height + margin.top + margin.bottom)
	.append("g")
	.attr("transform",
	"translate(" + margin.left + "," + margin.top + ")");

	svg.append("rect")
	.attr("class", "background")
	.attr("width", width)
	.attr("height", height)
	.on("click", reloadPage);

	var linkset = svg.append("g").attr("id","linkSet");
	// Set the sankey diagram properties
	var state;

	//the names of the columns that will be used in the Sankey.

	var nodeNames = ["target","source"];
	var countName = "value";
	var lastData = [];

	defaultPath = {'x':0};


	var relayout = function(maindata,filter) {

	filter = filter \|\| function() {return true;};
	var data = maindata.filter(filter);
	//dat = data
	//Drop the exiting selections from last time

	var graph = dataToNodeList(data);

	//here is goes.

	//make the new data frame

	var sankey = d3.sankey()
	.nodeWidth(42)
	.nodePadding(8)
	.size([width, height]);

	sankey.nodes(graph.nodes)
	.links(graph.links)
	.layout(12);

	path = sankey.link();

	linkColor = d3.scale.log().domain([0.1,1,10]).range(["red","grey","blue"]);

	//add in the links.

	var link = linkset.selectAll(".link")
	.data(graph.links,function(d) {return d.source.name + "-" + d.target.name;});

	var resetSizeDown = function() {
	height = 800;
	d3.select("svg").transition().duration(duration).attr("height",window.innerHeight);
	svg.attr("height",800);
	sankey.size([width,height]);
	};

	link.enter()
	.append("path")
	.style("stroke",function(d) {return linkColor(d.diff);})
	.attr("class", "link")
	.attr("d",function(d) {
	try {return path(defaultPath);}
	catch(e) {return path(d);}
	})
	.style("opacity",0)
	.style("stroke-width", function(d) { return Math.max(1, defaultPath.dy); })
	.on("click",function(d) {
	resetSizeDown();
	defaultPath = d;
	relayout(maindata,filter=function(e) {

	// return e.target==d.source.name \|\| e.source==d.source.name \|\| e.target==d.target.name \|\| e.source==d.target.name;
	});
	})
	.append("title")
	.text(function(d) {
	return d.source.name + " majors going into " +
	d.target.name + "\n" + format(d.value); });

	link.transition()
	.duration(duration)
	.style("opacity", 0.9)
	.attr("d",path)
	.style("stroke-width", function(d) { return Math.max(1, d.dy); })
	.sort(function(a, b) { return b.dy - a.dy; });

	link.exit().remove();
	// add the link titles

	// add in the nodes
	var node = svg.selectAll(".node")
	.data(graph.nodes,function(d) {return d.name;});

	entering = node.enter()
	.append("g");


	entering
	.attr("transform", function(d) {
	try {
	d.relative = defaultPath.source.x===d.x?
	defaultPath.source : defaultPath.target;
	} catch(error) {
	d.relative = d;
	}
	return "translate(" + d.x + "," + d.relative.y + ")";

	})
	.attr("class", "node");

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

	entering
	.append("rect")
	.on("click",function(d) {
	resetSizeDown();
	defaultPath = link.filter(function(e) {
	return e.source.name==d.name \|\| e.target.name==d.name;
	}).datum();

	relayout(maindata,filter=function(e) {

	var remainingNodes=[],
	nextNodes = [],
	allLinks = [];

	var traverse = [{
	linkType : "sourceLinks",
	nodeType : "target"
	},{
	linkType : "targetLinks",
	nodeType : "source"
	}];


	traverse.forEach(function(step){
	d[step.linkType].forEach(function(link) {
	remainingNodes.push(link[step.nodeType]);
	allLinks.push(link[step.nodeType].name);
	});

	while (remainingNodes.length) {
	nextNodes = [];
	remainingNodes.forEach(function(node) {
	node[step.linkType].forEach(function(link) {
	nextNodes.push(link[step.nodeType]);
	allLinks.push(link[step.nodeType].name);
	});
	});
	remainingNodes = nextNodes;
	}
	});

	var nodeNames = d3.keys(d3.nest().key(function (d) { return d; }).map(allLinks));

	// intended is clicked
	if (d.name.substring(0,1) == 'i') {
	return e.source==d.name \|\| (e.target==(nodeNames.indexOf(e.target) > -1 ? nodeNames[nodeNames.indexOf(e.target)] : "") && e.source==(nodeNames.indexOf(e.source) > -1 ? nodeNames[nodeNames.indexOf(e.source)] : ""));
	}

	// declared is clicked
	if (d.name.substring(0,1) == 'd') {
	return e.target==d.name \|\| e.source==d.name;
	}

	// degree is clicked
	if (d.name.substring(0,1) == 'g' \|\| d.name.substring(0,1) == 'i') {
	return e.target==d.name \|\| (e.source==(nodeNames.indexOf(e.source) > -1 ? nodeNames[nodeNames.indexOf(e.source)] : "") && e.target==(nodeNames.indexOf(e.target) > -1 ? nodeNames[nodeNames.indexOf(e.target)] : ""));
	}
	});
	})
	.style("fill", function(d) {
	return d.color = divisionColors(d.name.substring(1, d.name.length));})
	// return d.color = color(d.name.replace(/ .*/, "")); })
	.style("stroke", function(d) {
	return d3.rgb(d.color).darker(2); })
	.attr("height", function(d) { return d.relative.dy; })
	.style("opacity",0);

	entering.append("text")
	.attr("class","label")
	.attr("x", -6)
	.attr("dy", ".35em")
	.attr("text-anchor", "end")
	.attr("font-size","11px")
	.attr("transform", null)
	.text(function(d) { return d.name; })
	.filter(function(d) { return d.x < width / 2; })
	.attr("x", 6 + sankey.nodeWidth())
	.attr("text-anchor", "start");

	node.transition()
	.duration(duration)
	.attr("transform", function(d) {
	return "translate(" + d.x + "," + d.y + ")"; });

	// add the rectangles for the nodes
	node.selectAll("rect")
	.transition()
	.duration(duration)
	.style("opacity",1)
	.attr("height", function(d) {return d3.max([2,this.parentNode.__data__.dy]);})
	.attr("width", sankey.nodeWidth());

	d3.selectAll("text.label")
	.transition().duration(duration)
	.attr("y", function(d) { return this.parentNode.__data__.dy / 2; });


	node.exit().remove();
	// add in the title for the nodes

	//longer durations for all the later things.
	duration=2000;
	};
	// load the data
	d3.csv("idg_dep.csv", function(error, data) {
	var dat = data;
	// industries = d3.set(dat.map(function(d) {return d.source.split("-")[0];})).values();
	// industryColors = d3.scale.category20().domain(industries);

	depts = d3.set(dat.map(function(d) {return d.source.substring(1, d.source.length);})).values();
	divisionColors = d3.scale.category20b().domain(depts);
	//from http://www.d3noob.org/2013/02/formatting-data-for-sankey-diagrams-in.html
	relayout(data,filter=function(d) {return true;});
	});



	//functions

	function reloadPage() {

	document.location.reload(true);

	}


	var dataToNodeList = function(data) {
	var graph = {"nodes" : [], "links" : []};
	data.forEach(function (d) {
	// nodeNames.forEach(function(name) {
	// //add a node for each relevant column
	// graph.nodes.push({ "name": d[name] });
	// });
	graph.nodes.push({ "name": d.source });
	graph.nodes.push({ "name": d.target });
	graph.links.push({ "source": d.source,
	"target": d.target,
	"value": d.count}
	);
	});
	// return only the distinct / unique nodes
	graph.nodes = d3.keys(d3.nest()
	.key(function (d) { return d.name; })
	.map(graph.nodes));

	// loop through each link replacing the text with its index from node
	graph.links.forEach(function (d, i) {
	graph.links[i].source = graph.nodes.indexOf(graph.links[i].source);
	graph.links[i].target = graph.nodes.indexOf(graph.links[i].target);
	});



	//now loop through each nodes to make nodes an array of objects
	// rather than an array of strings
	graph.nodes.forEach(function (d, i) {
	graph.nodes[i] = { "name": d };
	});
	return graph;
	};
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>
	.node rect {
	cursor: move;
	fill-opacity: .9;
	shape-rendering: crispEdges;
	}
	.node text {
	pointer-events: none;
	text-shadow: 0 1px 0 #fff;
	}
	.link {
	fill: none;
	stroke: #000;
	stroke-opacity: .1;
	}
	.link:hover {
	stroke-opacity: .5;
	}

	body {
	font-family: 'Helvetica Neue', Sans serif;
	}

	rect.background {
	fill: white;
	}
	</style>


	<body>
	<h5>intend --> declare --> degree</h5>
	<p id="chart">
	<script type="text/javascript" src="http://d3js.org/d3.v3.min.js"></script>
	<script src="sankey.js"></script>
	<script src="idg_dep.js">

	</script>

	</body>
	</html>
	//from Mike Bostock

	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.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;
	};