JavaScript preprocessors can help make authoring JavaScript easier and more convenient. For instance, CoffeeScript can help prevent easy-to-make mistakes and offer a cleaner syntax and Babel can bring ECMAScript 6 features to browsers that only support ECMAScript 5.

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HTML Settings

Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

` ````
<div id="screen"></div>
```

` ````
html, body {
overflow: hidden;
touch-action: none;
content-zooming: none;
position: absolute;
margin: 0;
padding: 0;
width: 100%;
height: 100%;
background: #000;
}
#screen {
position: absolute;
width: 100vh;
height: 100vh;
max-height: 100vw;
max-width: 100vw;
margin: auto;
top: 0;
bottom: 0;
left: 0;
right: 0;
user-select: none;
}
#screen canvas {
position: relative;
float: left;
display: block;
width: 28.7vmin;
height: 28.7vmin;
background:#222;
margin-left: 3vmin;
margin-top: 3vmin;
border-radius: 3vmin;
}
```

` ````
"use strict";
{
const Box = class {
constructor(container, i) {
this.canvas = document.createElement("canvas");
container.appendChild(this.canvas);
this.width = this.canvas.width = this.canvas.offsetWidth;
this.height = this.canvas.height = this.canvas.offsetHeight;
this.ctx = this.canvas.getContext("2d");
this.ctx.lineCap = "round";
this.points = Array.from(
{ length: 12 },
_ => new Box.Point(this.width * 0.5, this.width * 0.5)
);
this.constraints = [];
this.color = `hsl(${10 * i}, 70%, 30%)`;
// links p1, p2, length, width
const links = [
[0, 1, 6, 5],
[1, 2, 5, 4],
[3, 7, 10, 6],
[7, 8, 7, 4],
[3, 9, 10, 6],
[9, 10, 7, 4],
[0, 4, 5, 0],
[0, 3, 7, 9],
[0, 5, 6, 5],
[5, 6, 5, 4],
[4, 11, 0.1, 11]
];
// constaints: p1, p2, p3, angle, range
const p2 = Math.PI / 2;
const p3 = Math.PI / 3;
[
[0, 4, 11, 0, 0, 0],
[4, 0, 3, 0, 1, 0.05],
[3, 0, 4, 0, 1, 0.05],
[3, 0, 1, p2, p2 * 4, 0],
[0, 1, 2, -p2, p3, 0.05],
[3, 0, 5, p2, p2 * 4, 0],
[0, 5, 6, -p2, p3, 0.05],
[0, 3, 7, -p3 + 0.5, p2, 0.05],
[0, 3, 9, -p3 + 0.5, p2, 0.05],
[3, 7, 8, p2, p3, 0.05],
[3, 9, 10, p2, p3, 0.05]
].forEach(p => {
this.constraints.push(new Box.Constraint(this, links, p, this.width / 30));
});
}
run() {
this.ctx.setTransform(0, 1, 1, 0, 0, 0);
this.ctx.clearRect(0, 0, this.width + 1, this.height + 1);
this.ctx.globalCompositeOperation = "lighter";
for (const constraint of this.constraints) constraint.solve();
for (const point of this.points) point.integrate();
}
};
Box.Point = class {
constructor(x, y) {
this.x = x;
this.y = y;
this.xb = x;
this.yb = y
this.w = 0;
}
integrate() {
const vx = (this.x - this.xb) * 0.995;
const vy = (this.y - this.yb) * 0.995;
this.xb = this.x;
this.yb = this.y;
this.x += vx;
this.y += vy;
}
};
Box.Constraint = class {
constructor(box, links, p, s) {
this.ctx = box.ctx;
this.p1 = box.points[p[0]];
this.p2 = box.points[p[1]];
this.p3 = box.points[p[2]];
this.m = 0;
this.angle = p[3];
this.range = p[4];
this.force = p[5];
const link1 = this.link(links, p[0], p[1]);
const link2 = this.link(links, p[1], p[2]);
this.len1 = link1[2] * s;
this.len2 = link2[2] * s;
this.width = link2[3] * s * 0.5;
if (this.width * 0.5 > this.p3.w) this.p3.w = this.width * 0.5;
this.shape = document.createElement("canvas");
if (this.width) {
this.shape.width = this.len2 + this.width;
this.shape.height = this.width;
const ict = this.shape.getContext("2d");
ict.lineCap = "round";
ict.strokeStyle = box.color;
ict.beginPath();
ict.lineWidth = this.width * 0.9;
ict.moveTo(this.width * 0.5, this.width * 0.5);
ict.lineTo(this.len2 + this.width * 0.5, this.width * 0.5);
ict.stroke();
}
}
link(links, p0, p1) {
for (const link of links) {
if (
(p0 === link[0] && p1 === link[1]) ||
(p1 === link[0] && p0 === link[1])
)
return link;
}
}
solve() {
const a1 = Math.atan2(this.p2.y - this.p1.y, this.p2.x - this.p1.x);
const b1 = Math.atan2(this.p3.y - this.p2.y, this.p3.x - this.p2.x);
const c = this.angle - (b1 - a1);
const d = c > Math.PI ? c - 2 * Math.PI : c < -Math.PI ? c + 2 * Math.PI : c;
const e = Math.abs(d) > this.range ? (-Math.sign(d) * this.range + d) * this.force : 0;
const cos1 = Math.cos(a1 - e);
const sin1 = Math.sin(a1 - e);
const x1 = this.p1.x + (this.p2.x - this.p1.x) * 0.5;
const y1 = this.p1.y + (this.p2.y - this.p1.y) * 0.5;
this.p1.x = x1 - cos1 * this.len1 * 0.5;
this.p1.y = y1 - sin1 * this.len1 * 0.5;
this.p2.x = x1 + cos1 * this.len1 * 0.5;
this.p2.y = y1 + sin1 * this.len1 * 0.5;
this.m += 0.0005 * (Math.random() - 0.5);
this.m *= 0.99;
const a2 = this.m + Math.atan2(this.p2.y - this.p3.y, this.p2.x - this.p3.x) + e;
const cos2 = Math.cos(a2);
const sin2 = Math.sin(a2);
const x2 = this.p3.x + (this.p2.x - this.p3.x) * 0.5;
const y2 = this.p3.y + (this.p2.y - this.p3.y) * 0.5;
this.p3.x = x2 - cos2 * this.len2 * 0.5;
this.p3.y = y2 - sin2 * this.len2 * 0.5;
this.p2.x = x2 + cos2 * this.len2 * 0.5;
this.p2.y = y2 + sin2 * this.len2 * 0.5;
if (this.width) {
this.ctx.setTransform(cos2, sin2, -sin2, cos2, this.p2.x, this.p2.y);
this.ctx.drawImage(
this.shape,
-this.len2 - this.width * 0.5,
-this.width * 0.5
);
}
}
};
const screen = document.querySelector("#screen");
const boxes = Array.from({ length: 9 }, (v, i) => new Box(screen, i));
const run = () => {
requestAnimationFrame(run);
for (const box of boxes) box.run();
};
run();
}
```

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