walmart stores across america

<!DOCTYPE html>
<meta charset="utf-8">
<link href='https://fonts.googleapis.com/css?family=Cardo:400,400italic,700' rel='stylesheet' type='text/css'>
<style>

h2 {

font-family: 'Cardo';
  font-size: 18px;
  font-style: italic; 
  font-weight: 400; 
}

svg {
  background: radial-gradient(720px at 490px, #081f2b 0%, #061616 100%);
 /* height: 960px;*/
}

path {
  fill: none;
  stroke-linejoin: round;
}

.counties {
  fill: none;
  stroke: #fff;
  stroke-width: .25px;
}

.land {
  fill: #ddd;
}

.states path {
  stroke: #fff;
}

.hexagons path {
  stroke: #FFC300;
}

</style>
<body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/d3-array.v1.min.js"></script>
<script src="https://d3js.org/d3-geo.v1.min.js"></script>
<script src="https://d3js.org/topojson.v2.min.js"></script>
<script src="https://d3js.org/d3-geo-projection.v1.min.js"></script>
<script src="https://d3js.org/d3-dispatch.v1.min.js"></script>
<script src="https://d3js.org/d3-ease.v1.min.js"></script>
<script src="https://d3js.org/d3-interpolate.v1.min.js"></script>
<script src="https://d3js.org/d3-scale-chromatic.v1.min.js"></script>
<script src="https://d3js.org/d3-selection.v1.min.js"></script>
<script src="https://d3js.org/d3-timer.v1.min.js"></script>
<script src="https://d3js.org/d3-transition.v1.min.js"></script>
<script src="https://d3js.org/d3-drag.v1.min.js"></script>
<script src="https://d3js.org/d3-zoom.v1.min.js"></script>
<script src="https://d3js.org/d3-array.v1.min.js"></script>
<script src="https://d3js.org/d3-collection.v1.min.js"></script>
<script src="https://d3js.org/d3-color.v1.min.js"></script>
<script src="https://d3js.org/d3-format.v1.min.js"></script>
<script src="https://d3js.org/d3-time.v1.min.js"></script>
<script src="https://d3js.org/d3-time-format.v2.min.js"></script>
<script src="https://d3js.org/d3-scale.v1.min.js"></script>
<script src="https://d3js.org/d3-queue.v3.min.js"></script>
<script src="hexbin.min.js"></script>
<script>

//reference is this mbostock example: https://bl.ocks.org/mbostock/4330486

var width = 960,
    height = 600;

var parseTime = d3.timeParse("%m-%d-%Y");

var color = d3.scaleTime()
    .domain([new Date(1962, 0, 1), new Date(2006, 0, 1)])
    .range(["black", "steelblue"])
    .interpolate(d3.interpolateLab);

var hexbin = d3.hexbin()
    .size([width, height])
    .radius(8);

var radius = d3.scaleSqrt()
    .domain([0, 12])
    .range([0, 8]);

var projection = d3.geoAlbers()
    .scale(1000)
    .translate([width / 2, height / 2])
    .precision(.1);

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

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

d3.queue()
    .defer(d3.json, "us.json")
    .defer(d3.tsv, "readme-walmart.tsv")
    .await(ready);

function ready(error, us, walmarts) {
  if (error) throw error;

walmarts.forEach(function(d) {
    var p = projection(d);
    d[0] = p[0], d[1] = p[1];
    d.date = parseTime(d.date);
  });

var defs = svg.append("defs");

//Filter for the outside glow
  var filter = defs.append("filter")
    .attr("id","glow");
filter.append("feGaussianBlur")
    .attr("stdDeviation","3.5")
    .attr("result","coloredBlur");
var feMerge = filter.append("feMerge");
feMerge.append("feMergeNode")
    .attr("in","coloredBlur");
feMerge.append("feMergeNode")
    .attr("in","SourceGraphic");

var filter = defs.append("filter").attr("id","gooeyCodeFilter");
      filter.append("feGaussianBlur")
        .attr("in","SourceGraphic")
        .attr("stdDeviation","10")
        //to fix safari: https://stackoverflow.com/questions/24295043/svg-gaussian-blur-in-safari-unexpectedly-lightens-image
        .attr("color-interpolation-filters","sRGB") 
        .attr("result","blur");
      filter.append("feColorMatrix")
        .attr("in","blur")
        .attr("mode","matrix")
        .attr("values","1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 19 -9")
        .attr("result","gooey");

var colors = ["#490A3D","#BD1550","#E97F02","#F8CA00","#8A9B0F"];
      defs.append("linearGradient")
        .attr("id", "gradientRainbow")
        .attr("gradientUnits", "userSpaceOnUse") 
        .selectAll("stop") 
        .data(d3.range(colors.length))                  
        .enter().append("stop") 
        .attr("offset", function(d,i) { return (i/(colors.length-1)*100) + "%"; })   
        .attr("stop-color", function(d) { return colors[d]; });

svg.append("g")
      .attr("class", "counties")
    .selectAll("path")
      .data(topojson.feature(us, us.objects.counties).features)
    .enter().append("path")
      // .attr("class", function(d) { return quantize(rateById.get(d.id)); })
      .attr("d", path);

svg.append("path")
      .datum(topojson.feature(us, us.objects.land))
      .attr("class", "land")
      .attr("d", path);

svg.append("path")
      .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; }))
      .attr("class", "states")
      .attr("d", path);

svg.append("g")
      .attr("class", "counties")
    .selectAll("path")
      .data(topojson.feature(us, us.objects.counties).features)
    .enter().append("path")
      .attr("d", path);

svg.append("path")
      .datum(topojson.mesh(us, us.objects.counties, function(a, b) { return a !== b; }))
      .attr("class", "counties")
      .attr("d", path);

svg.append("g")
      .attr("class", "hexagons")
    .selectAll("path")
      .data(hexbin(walmarts).sort(function(a, b) { return b.length - a.length; }))
    .enter().append("path")
      .attr("d", function(d) { return hexbin.hexagon(radius(d.length)); })
      .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; })
      .style("fill", "url(#gradientRainbow)")
      // .style("fill", function(d) { return color(d3.median(d, function(d) { return +d.date; })); })
      .style("mix-blend-mode", "overlay");

d3.selectAll("g")
    .style("filter", "url(#glow)");
}

</script>

https://d3js.org/d3.v4.min.js

https://d3js.org/d3-array.v1.min.js

https://d3js.org/d3-geo.v1.min.js

https://d3js.org/topojson.v2.min.js

https://d3js.org/d3-geo-projection.v1.min.js

https://d3js.org/d3-dispatch.v1.min.js

https://d3js.org/d3-ease.v1.min.js

https://d3js.org/d3-interpolate.v1.min.js

https://d3js.org/d3-scale-chromatic.v1.min.js

https://d3js.org/d3-selection.v1.min.js

https://d3js.org/d3-timer.v1.min.js

https://d3js.org/d3-transition.v1.min.js

https://d3js.org/d3-drag.v1.min.js

https://d3js.org/d3-zoom.v1.min.js

https://d3js.org/d3-array.v1.min.js

https://d3js.org/d3-collection.v1.min.js

https://d3js.org/d3-color.v1.min.js

https://d3js.org/d3-format.v1.min.js

https://d3js.org/d3-time.v1.min.js

https://d3js.org/d3-time-format.v2.min.js

https://d3js.org/d3-scale.v1.min.js

https://d3js.org/d3-queue.v3.min.js