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General Election seat changes 2010-2015 Sankey Diagram

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<title>Sankey Diagram</title>
<style>

h1 {
font-size: 24px;
font-family: Arial;
font-weight: 200;
}

#chart {
  height: 600px;
}

.node rect {
  cursor: move;
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</head>
<body>

<h1>General Election seat changes 2010-2015</h1>

var margin = {top: 1, right: window.innerWidth*.1, bottom: 6, left: window.innerWidth*.1},
    width = window.innerWidth*.7;
	height = window.innerHeight/1.25;
	
	//width = 960 - margin.left - margin.right,
    //height = 600 - margin.top - margin.bottom;

var formatNumber = d3.format(",.0f"),
    formatsingle = function(d) { return formatNumber(d) + " seat"; },
    formatmultiple = function(d) { return formatNumber(d) + " seats"; },
	color = d3.scale.category20();

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 + ")");

var titletext1 = d3.select("g")
.append("text")
.text("2010")
.attr("font-family","Arial")
.attr("font-size",48)
.attr("transform", "translate(" + window.innerWidth*-.1 + "," + (height/2) + ") ");

var titletext2 = d3.select("g")
.append("text")
.text("2015")
.attr("font-family","Arial")
.attr("font-size",48)
.attr("transform", "translate(" + window.innerWidth*.715 + "," + (height/2) + ") ");

var sankey = d3.sankey()
    .nodeWidth(15)
    .nodePadding(10)
    .size([width, height]);

var path = sankey.link();

function createChart( seat ) {
  sankey
      .nodes(seat.nodes)
      .links(seat.links)
      .layout(32);

var link = svg.append("g").selectAll(".link")
      .data(seat.links)
    .enter().append("path")
      .attr("class", function(d) { return (d.causesCycle ? "cycleLink" : "link") })
      .attr("d", path)
	  .style("stroke", function(d) { return d.color })
      .style("stroke-width", function(d) { return Math.max(1, d.dy); })
      .sort(function(a, b) { return b.dy - a.dy; })

link.append("title")
      .text(function(d) {
	  if (d.value == 1) {
	  { return d.source.name + " -> " + d.target.name + "\n" + formatsingle(d.value); };
		}
		else {
		{ return d.source.name + " -> " + d.target.name + "\n" + formatmultiple(d.value); };
		}
		})
		
  var node = svg.append("g").selectAll(".node")
      .data(seat.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));
 
	node.append("rect")
      .attr("height", function(d) { return d.dy; })
      .attr("width", sankey.nodeWidth())
	  .style("fill", function(d) { return d.color })
      .style("stroke", function(d) { return d.color })
	  .on("mouseover",mouseover)
	  .on("mouseout",mouseout)
	  
    .append("title")
      .text(function(d) {
	  if (d.value == 1) {
	  { return d.name + "\n" + formatsingle(d.value); };
		}
		else {
		{ return d.name + "\n" + formatmultiple(d.value); };
		}
		})
		
	function mouseover(d,i) {
//	d3.selectAll("path").style("stroke","pink")
//	d3.selectAll("path").classed("fade",1)
	d3.selectAll("path.link").classed("fade", function(p) {
	return p.source == d
	|| p.target == d
	})
//	var paths = d3.select("path")
	//paths.classed("fade",true)/*function(p) {
	//return p.source.index != d.index
	//&& p.target.index != d.index
	//})*/;
//	rects.classed("fade",true)//style("stroke-opacity",1);
	/*node.classed("fade", function(p) {
	return p.source.index != d.index	
	&& p.target.index != d.index
	})*/
	}
	
	function mouseout() {
	d3.selectAll("path.link").classed("fade",false)
	}
	
  node.append("text")
      .attr("x", -6)
      .attr("y", function(d) { return d.dy / 2; })
      .attr("dy", ".35em")
      .attr("text-anchor", "end")
      .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");

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);
  }
  
};

var seatData = {"nodes":[
{"name":"Alliance","color":"#F6CB2F"},
{"name":"Conservative","color":"#0087DC"},
{"name":"DUP","color":"#D46A4C"},
{"name":"Green Party","color":"#6AB023"},
{"name":"Independent","color":"#DDDDDD"},
{"name":"Labour","color":"#DC241f"},
{"name":"Liberal Democrats","color":"#FDBB30"},
{"name":"Plaid Cymru","color":"#008142"},
{"name":"Respect","color":"#FF3300"},
{"name":"SDLP","color":"#99FF66"},
{"name":"Sinn Fein","color":"#008800"},
{"name":"SNP","color":"#FFFF00"},
{"name":"UKIP","color":"#70147A"},
{"name":"Conservative","color":"#0087DC"},
{"name":"DUP","color":"#D46A4C"},
{"name":"Green Party","color":"#6AB023"},
{"name":"Independent","color":"#DDDDDD"},
{"name":"Labour","color":"#DC241f"},
{"name":"Liberal Democrats","color":"#FDBB30"},
{"name":"Plaid Cymru","color":"#008142"},
{"name":"SDLP","color":"#99FF66"},
{"name":"Sinn Fein","color":"#008800"},
{"name":"SNP","color":"#FFFF00"},
{"name":"UKIP","color":"#70147A"},
{"name":"Ulster Unionist Party","color":"#9999FF"},
],
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