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<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