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@mbostock

mbostock/.block

Last active July 27, 2023 08:06
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Force-Directed Web Worker
Raw
.block
license: gpl-3.0
height: 960
Raw
README.md
Raw
index.html
<!DOCTYPE html>
<meta charset="utf-8">
<div id="progress"></div>
<canvas width="960" height="960"></canvas>
<script src="https://d3js.org/d3-array.v1.min.js"></script>
<script>
var nodes = d3.range(1000).map(function(i) {
return {
index: i
};
});
var links = d3.range(nodes.length - 1).map(function(i) {
return {
source: Math.floor(Math.sqrt(i)),
target: i + 1
};
});
var meter = document.querySelector("#progress"),
canvas = document.querySelector("canvas"),
context = canvas.getContext("2d"),
width = canvas.width,
height = canvas.height;
var worker = new Worker("worker.js");
worker.postMessage({
nodes: nodes,
links: links
});
worker.onmessage = function(event) {
switch (event.data.type) {
case "tick": return ticked(event.data);
case "end": return ended(event.data);
}
};
function ticked(data) {
var progress = data.progress;
meter.style.width = 100 * progress + "%";
}
function ended(data) {
var nodes = data.nodes,
links = data.links;
meter.style.display = "none";
context.clearRect(0, 0, width, height);
context.save();
context.translate(width / 2, height / 2);
context.beginPath();
links.forEach(drawLink);
context.strokeStyle = "#aaa";
context.stroke();
context.beginPath();
nodes.forEach(drawNode);
context.fill();
context.strokeStyle = "#fff";
context.stroke();
context.restore();
}
function drawLink(d) {
context.moveTo(d.source.x, d.source.y);
context.lineTo(d.target.x, d.target.y);
}
function drawNode(d) {
context.moveTo(d.x + 3, d.y);
context.arc(d.x, d.y, 3, 0, 2 * Math.PI);
}
</script>
<style>
#progress {
position: fixed;
top: 0;
left: -6px;
width: 0%;
height: 2px;
background: red;
}
#progress:before,
#progress:after {
content: "";
position: absolute;
height: 2px;
opacity: 0.6;
box-shadow: red 1px 0 6px 1px;
border-radius: 100%;
}
#progress:before {
width: 20px;
right: 0;
clip: rect(-6px, 22px, 14px, 10px);
}
#progress:after {
width: 180px;
right: -80px;
clip: rect(-6px, 90px, 14px, -6px);
}
</style>
Raw
worker.js
importScripts("https://d3js.org/d3-collection.v1.min.js");
importScripts("https://d3js.org/d3-dispatch.v1.min.js");
importScripts("https://d3js.org/d3-quadtree.v1.min.js");
importScripts("https://d3js.org/d3-timer.v1.min.js");
importScripts("https://d3js.org/d3-force.v1.min.js");
onmessage = function(event) {
var nodes = event.data.nodes,
links = event.data.links;
var simulation = d3.forceSimulation(nodes)
.force("charge", d3.forceManyBody())
.force("link", d3.forceLink(links).distance(20).strength(1))
.force("x", d3.forceX())
.force("y", d3.forceY())
.stop();
for (var i = 0, n = Math.ceil(Math.log(simulation.alphaMin()) / Math.log(1 - simulation.alphaDecay())); i < n; ++i) {
postMessage({type: "tick", progress: i / n});
simulation.tick();
}
postMessage({type: "end", nodes: nodes, links: links});
};
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