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FrissAnalytics/.block

Last active January 25, 2020 13:09
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d3 force states v4
Raw
.block
license: mit
Raw
index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>
path {
fill: #ddd;
fill-opacity: .8;
stroke: #fff;
stroke-width: 1.5px;
}
line {
stroke: #999;
}
</style>
<body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/topojson.v1.min.js"></script>
<script>
// Mike Bostock's bl.ock updated for D3 v4 https://bl.ocks.org/mbostock/1073373
var width = 960,
height = 700;
var path = d3.geoPath();
var simulation = d3.forceSimulation();
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
d3.json("https://d3js.org/us-10m.v1.json", function (error, us) {
if (error) throw error;
var states = topojson.feature(us, us.objects.states),
nodes = [],
links = [];
states.features.forEach(function (d, i) {
if (d.id === "02" || d.id === "15" || d.id === "72") return; // lower 48
var centroid = path.centroid(d);
if (centroid.some(isNaN)) return;
centroid.x = centroid[0];
centroid.y = centroid[1];
centroid.feature = d;
nodes.push(centroid);
});
d3.voronoi().links(nodes).forEach(function (link) {
var dx = link.source.x - link.target.x,
dy = link.source.y - link.target.y;
link.distance = Math.sqrt(dx * dx + dy * dy);
links.push(link);
});
var link = svg.selectAll("line")
.data(links)
.enter().append("line")
.attr("x1", function (d) { return d.source.x; })
.attr("y1", function (d) { return d.source.y; })
.attr("x2", function (d) { return d.target.x; })
.attr("y2", function (d) { return d.target.y; });
var node = svg.selectAll("g")
.data(nodes)
.enter().append("g")
.attr("transform", function (d) { return "translate(" + -d.x + "," + -d.y + ")"; })
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended))
.append("path")
.attr("transform", function (d) { return "translate(" + d.x + "," + d.y + ")"; })
.attr("d", function (d) { return path(d.feature); });
usCentroid = [d3.mean(nodes, function (d) { return d.x; }),
d3.mean(nodes, function (d) { return d.y; })];
simulation.nodes(nodes)
.force("charge", d3.forceManyBody().strength(-5))
.force("link", d3.forceLink(links).distance(function (d) { return d.distance; }))
.force("center", d3.forceCenter(usCentroid[0], usCentroid[1]))
.on("tick", ticked);
function ticked() {
link.attr("x1", function (d) { return d.source.x; })
.attr("y1", function (d) { return d.source.y; })
.attr("x2", function (d) { return d.target.x; })
.attr("y2", function (d) { return d.target.y; });
node.attr("transform", function (d) {
return "translate(" + d.x + "," + d.y + ")";
});
}
});
function dragstarted(d) {
if (!d3.event.active) simulation.alphaTarget(0.3).restart();
d.fx = d.x;
d.fy = d.y;
}
function dragged(d) {
d.fx = d3.event.x;
d.fy = d3.event.y;
}
function dragended(d) {
if (!d3.event.active) simulation.alphaTarget(0);
d.fx = null;
d.fy = null;
}
</script>
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