flowMap/flows.html at master · jkerryn/flowMap · GitHub

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<!DOCTYPE html>
<meta charset="utf-8">
<style>

.states {
  fill: #ccc;
}

.state-borders {
  fill: none;
  stroke: #fff;
  stroke-width: 1.5px;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.county-borders {
  fill: none;
  stroke: #fff;
  stroke-width: .25px;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.county-arcs {
  display: none;
  fill: none;
  stroke: #000;
}

.county-cell {
  fill: black;
  pointer-events: all;
  stroke: #fff;
  stroke-width: 0.25px;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.counties circle {
  fill: steelblue;
  stroke: #fff;
  pointer-events: none;
}

.county:hover .county-arcs {
  display: inline;
}

.county-arcs2 {
  display: inline;
  stroke: rgba(255,255,255,.5);
  stroke-width: 1.5;
  fill: none;
  stroke: #000;
}

.link {
  stroke: rgba(255,255,255,.5);
  fill: none;
  stroke: #000;

}

svg:not(:hover) .county-cell {
  stroke: #000;
  stroke-opacity: .2;
}

svg .link_line {
  stroke: rgba(255,255,255,.5);
  stroke-width: 1.5;
}

</style>
<body>


<script src="scripts/d3.v3.min.js"></script>
<script src="scripts/queue.min.js"></script>
<script src="scripts/topojson.js"></script>
<script>

var width = 960,
    height = 500;

var d3LineLinear = d3.svg.line().interpolate("linear");
var d3color = d3.interpolateRgb("#BAE4B3", "#006D2C"); /* color range for flow lines */

var projection = d3.geo.albers() /* map projection - ALBERS */
    .translate([width / 2, height / 2])
    .scale(1080);

var path = d3.geo.path()
    .projection(projection);

var radius = d3.scale.sqrt() /* for scaling proportional symbols */
    .domain([0, 1e6])
    .range([0, 15]);


var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

queue() /* load data, await ready */
    .defer(d3.json, "data/us.json")
    .defer(d3.csv, "data/nodes.csv")
    .defer(d3.csv, "data/flowsB.csv")
    .await(ready);

function ready(error, us, counties, flows) {
  var countyById = d3.map(),
      positions = [];

  counties.forEach(function(d) {
    countyById.set(d.GEOID, d);
    d.outgoing = [];
    d.incoming = [];
	d.pop = d.pop /* population variable */
  });

  flows.forEach(function(flow) {
    var source = countyById.get(flow.Orig_GEOID10),
        target = countyById.get(flow.Dest_GEOID10),
		magnitude = +flow.filings;
        link = {source: source, target: target, magnitude: magnitude};
		//console.log('no', link);
    	source.outgoing.push(link);
		//console.log('te', flow);
    	target.incoming.push(link);

  });


  //GLOBAL STRENGTH SCALE

  var strength_scale = d3.scale.sqrt().range([.2, 2]) /* thickness range for flow lines */
    .domain([0, d3.max(flows, function(d) {
        return d.filings;

    })]);


    //var color_scale = d3.scale.linear().range([0, 1]).domain([0, d3.max(flows, function(d) {
      //  return d.filings; /*scale arrow color based on filings */
    //})]);

  counties = counties.filter(function(d) {
    if (d.count = Math.max(d.incoming.length, d.outgoing.length)) {
      d[0] = +d.lon;
      d[1] = +d.lat;
      var position = projection(d);
      d.x = position[0];
      d.y = position[1];
      return true;
    }
  });


//LAND from topoJSON
  svg.append("path")
      .datum(topojson.feature(us, us.objects.land))
      .attr("class", "states")
      .attr("d", path);

//COUNTIES from topoJSON
  svg.append("path")
      .datum(topojson.mesh(us, us.objects.counties, function(a, b) { return a !== b; }))
      .attr("class", "county-borders")
      .attr("d", path);

//STATES from topoJSON
  svg.append("path")
      .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; }))
      .attr("class", "state-borders")
      .attr("d", path);


  var county = svg.append("g")
      .attr("class", "counties")
    .selectAll("g")
      .data(counties.sort(function(a, b) { return b.count - a.count; }))
    .enter().append("g");

  /*county.append("path")
      .attr("class", "county-cell")
      .attr("d", function(d) { return d.cell.length ? "M" + d.cell.join("L") + "Z" : null; });*/

//Proportional Circles on Map based on population (d.pop)
 county.append("circle")
      .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; })
	  .attr("class", "circle")
	  .attr("id", "circle")
      .attr("r", function(d) { return radius(d.pop); })

//Links between counties based on flows
 county.append("g")
      .attr("class", "link")
    .selectAll("path")
      .data(function(d) { return d.outgoing; })
	  .enter().append("path")
	  .attr("d", function(d) { return path({type: "LineString", coordinates: [d.source, d.target]})})
      .style("stroke-width", function(d) { return strength_scale(d.magnitude); })
	 .attr("d", function(d) {
        return drawCurve(d);
    });


	 //function to replicated scaled lines and arrowheads

	 function drawCurve(d) {
        var slope = Math.atan2((+d3.select('#circle' + d.target) - d3.select('#circle' + d.source)), (+d3.select('#circle' + d.target) - d3.select('#circle' + d.source)));
        var slopePlus90 = Math.atan2((+d3.select('#circle' + d.target) - d3.select('#circle' + d.source)), (+d3.select('#circle' + d.target) - d3.select('#circle' + d.source))) + (Math.PI / 2);

        var sourceX = +d3.select('#circle' + d.source).attr("cx");
        var sourceY = +d3.select('#circle' + d.source).attr("cy");
        var targetX = +d3.select('#circle' + d.target).attr("cx");
        var targetY = +d3.select('#circle' + d.target).attr("cy");

        var arrowOffset = 20;
        var points = [];
        points.push([sourceX + radius * Math.cos(slope) - strength_scale(d.magnitude) * Math.cos(slopePlus90), sourceY + radius * Math.sin(slope) - strength_scale(d.magnitude) * Math.sin(slopePlus90)]);
        points.push([sourceX + radius * Math.cos(slope), sourceY + radius * Math.sin(slope)]);
        points.push([targetX - radius * Math.cos(slope), targetY - radius * Math.sin(slope)]);
        points.push([targetX - (radius + arrowOffset) * Math.cos(slope) - strength_scale(d.magnitude + (arrowOffset / 2)) * Math.cos(slopePlus90), targetY - (radius + arrowOffset) * Math.sin(slope) - strength_scale(d.magnitude + (arrowOffset / 2)) * Math.sin(slopePlus90)]);
        points.push([targetX - (radius + arrowOffset) * Math.cos(slope) - strength_scale(d.magnitude) * Math.cos(slopePlus90), targetY - (radius + arrowOffset) * Math.sin(slope) - strength_scale(d.magnitude) * Math.sin(slopePlus90)]);
        return d3LineLinear(points) + "Z";
    }


}


</script>