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labyrinth-04-d3-force.html
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<html>
<head>
<script src="https://d3js.org/d3-collection.v1.min.js"></script>
<script src="https://d3js.org/d3-dispatch.v1.min.js"></script>
<script src="https://d3js.org/d3-quadtree.v1.min.js"></script>
<script src="https://d3js.org/d3-timer.v1.min.js"></script>
<script src="https://d3js.org/d3-force.v1.min.js"></script>
<style>
body {
padding: 10;
margin: 0
}
</style>
</head>
<body>
<canvas width="600" height="600"></canvas>
<p>
<a href="https://github.com/forresto/sketch/blob/master/labyrinth-04-d3-force.html">source</a>
-
<a href="https://twitter.com/forresto/status/948583179363012613">more</a>
</p>
<script>
const TAU = Math.PI * 2;
const RADIUS = 20;
let count = 12;
const canvas = document.querySelector("canvas"),
context = canvas.getContext("2d"),
// width = canvas.width = window.innerWidth,
// height = canvas.height = window.innerHeight;
width = canvas.width,
height = canvas.height;
// MAKE CHAIN
const nodes = [];
const links = [];
for (let i = 0; i < count; i++) {
nodes.push({
x: Math.cos(TAU * i / count) * 100 + width / 2,
y: Math.sin(TAU * i / count) * 100 + height / 2,
created: Date.now(),
radius: 10,
});
if (i > 0) {
links.push({
source: nodes[i - 1],
target: nodes[i],
})
}
if (i === count - 1) {
links.push({
source: nodes[i],
target: nodes[0],
})
}
}
const graph = { nodes, links, addOne }
function addOne(index) {
const prev = nodes[index];
const next = nodes[(index + 1) % count];
const newNode = {
x: (prev.x + next.x) / 2,
y: (prev.y + next.y) / 2,
created: Date.now(),
radius: 1,
}
nodes.splice((index + 1) % count, 0, newNode)
links.splice(index, 1, {
source: prev,
target: newNode
})
links.splice((index + 1) % count, 0, {
source: newNode,
target: next
})
count++;
simulation.nodes(nodes);
simulation.alphaTarget(0.05);
// console.log(prev.index, newNode.index, next.index);
}
function bump() {
simulation.nodes(nodes);
simulation.alphaTarget(0.05);
};
document.body.onclick = bump;
function addTwo() {
const index = Math.floor(count * Math.random());
addOne(index)
const symmetricalIndex = (index + Math.floor(count / 2)) % count;
addOne(symmetricalIndex);
}
const simulation = d3.forceSimulation(nodes)
.force("symmetry", forceSymmetry)
// .force("charge", d3.forceManyBody().strength(-1))
.force("collide", d3.forceCollide().radius(collideRadius).strength(0.1))
.force("link", d3.forceLink(links).distance(linkDistance).strength(1))
.force("bbox", forceBbox)
.on("tick", ticked);
function collideRadius(node) {
return Math.max(1, node.radius) * 0.95;
}
function linkDistance(link) {
return Math.max(1, (link.source.radius + link.target.radius)) * 0.75;
}
function forceBbox(alpha) {
const MARGIN = RADIUS + 1;
for (let i = 0, n = nodes.length, k = alpha * 0.1; i < n; ++i) {
let node = nodes[i];
if (node.x < MARGIN) {
node.x = MARGIN;
}
if (node.x > width - MARGIN) {
node.x = width - MARGIN;
}
if (node.y < MARGIN) {
node.y = MARGIN;
}
if (node.y > height - MARGIN) {
node.y = height - MARGIN;
}
}
}
function forceSymmetry(alpha) {
const length = nodes.length;
const halfLength = length / 2;
for (let index = 0; index < length; index++) {
const node = nodes[index];
if (index > halfLength) {
const prevNode = nodes[index - halfLength]
node.x = width / 2 - (prevNode.x - width / 2);
node.y = height / 2 - (prevNode.y - height / 2);
}
}
}
let lastAdd = 0;
function ticked() {
context.clearRect(0, 0, width, height);
context.fillStyle = "#FFF"
context.fillRect(0, 0, width, height);
context.strokeStyle = "#999";
context.lineWidth = 1;
graph.nodes.forEach(drawNode);
context.strokeStyle = "#000";
// context.lineWidth = 2;
context.beginPath();
graph.links.forEach(drawLink);
context.stroke();
if (count < 354 && Date.now() > lastAdd + 300) {
lastAdd = Date.now();
addTwo();
}
if (bumpNext) {
bump()
bumpNext = false;
}
}
function drawLink(link) {
context.moveTo(link.source.x, link.source.y);
context.lineTo(link.target.x, link.target.y);
}
let bumpNext = false;
function drawNode(node, i) {
if (node.radius < RADIUS) {
const timeRadius = Math.min(
RADIUS,
Math.max(
0,
(Date.now() - node.created) / 500 * RADIUS
)
);
if (node.radius < timeRadius) {
node.radius = timeRadius;
bumpNext = true;
}
}
context.beginPath();
context.arc(node.x, node.y, 3, 0, TAU);
context.stroke();
context.beginPath();
context.arc(node.x, node.y, node.radius, 0, TAU);
context.fillStyle = `hsla(${360 * i / count}, 100%, 50%, 0.1)`;
context.fill();
context.stroke();
}
</script>
</body>
</html>