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Below is the html code for this video.
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Evolving Abstract Art</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="container">
<canvas id="canvas"></canvas>
</div>
<script src="index.js"></script>
</body>
</html>Below is the css code for this video.
style.css
* {
margin: 0;
padding: 0;
}
body {
display: flex;
height: 100vh;
width: 100%;
background: #000000;
align-items: center;
justify-content: center;
}
.container {
overflow: hidden;
}Below is the javascript code for this video.
index.js
const TP = 2 * Math.PI, canvasSize = 400, ctx = (() => {
let c = document.getElementById("canvas");
c.width = 2 * canvasSize;
c.height = 2 * canvasSize;
return c.getContext("2d");
})();
ctx.translate(canvasSize, canvasSize);
ctx.lineCap = "round";
onresize = () => {
let D = Math.min(window.innerWidth, window.innerHeight) - 40;
ctx.canvas.style.width = D + "px";
ctx.canvas.style.height = D + "px";
};
const getRandomInt = (min, max, low) => {
if (low) return Math.floor(Math.random() * Math.random() * (max - min)) + min;
else return Math.floor(Math.random() * (max - min)) + min;
};
var Circle = function (x, y, xp, yp, radius, pc) {
this.x = x;
this.y = y;
this.xp = xp;
this.yp = yp;
this.radius = radius;
this.pc = pc;
this.c = [];
this.drawCircle = (rf) => {
ctx.beginPath();
ctx.moveTo(this.x + this.radius * rf, this.y);
ctx.arc(this.x, this.y, this.radius * rf, 0, TP);
ctx.fillStyle = "hsl(" + (hue + 5 * this.radius) + ", 90%, 50%)";
ctx.fill();
};
};
var Curve = function () {
this.car = [];
this.to = -getRandomInt(0, 400);
this.addCurveCircle = (cir) => {
if (cir.pc) {
this.car.unshift(cir.pc);
this.addCurveCircle(cir.pc);
} else return;
};
this.setPath = () => {
this.len = 0;
this.path = new Path2D();
this.path.moveTo(0, 0);
this.path.lineTo(this.car[1].xp, this.car[1].yp);
this.len += this.car[0].radius;
for (let i = 1; i < this.car.length - 1; i++) {
this.path.bezierCurveTo(this.car[i].x, this.car[i].y, this.car[i].x, this.car[i].y, this.car[i + 1].xp, this.car[i + 1].yp);
this.len += 2 * this.car[i].radius;
}
this.path.lineTo(this.car[this.car.length - 1].x, this.car[this.car.length - 1].y);
this.len += this.car[this.car.length - 1].radius;
};
this.drawCurve = () => {
let tt = this.to + t;
ctx.setLineDash([Math.max(1, tt), 4000]);
ctx.stroke(this.path);
if (tt > this.len + 40) {
this.car[this.car.length - 1].drawCircle(0.8);
if (tt > this.len + 120) return false;
else return true;
} else if (tt > this.len) {
let raf = (0.8 * (tt - this.len)) / 40;
this.car[this.car.length - 1].drawCircle(raf);
return true;
} else return true;
};
};
var drawPoint = (x, y, col) => {
ctx.beginPath();
ctx.arc(x, y, 5, 0, TP);
ctx.closePath();
if (col) ctx.fillStyle = col;
else ctx.fillStyle = "red";
ctx.fill();
};
var cval = (x, y, rad) => {
if (Math.pow(x * x + y * y, 0.5) > canvasSize - rad) return false;
for (let i = 0; i < ca.length; i++) {
let rt = rad + ca[i].radius;
let xd = ca[i].x - x;
let yd = ca[i].y - y;
if (Math.abs(xd) > rt) continue;
if (Math.abs(yd) > rt) continue;
if (Math.pow(xd * xd + yd * yd, 0.5) + 1 < rt) return false;
}
return true;
};
var eg = Math.random() < 0.3;
var grow = (rad) => {
let c = eg ? ca[ca.length - 1 - getRandomInt(0, ca.length, true)] : ca[getRandomInt(0, ca.length)];
let a = TP * Math.random();
let x = c.x + (c.radius + rad) * Math.cos(a);
let y = c.y + (c.radius + rad) * Math.sin(a);
if (cval(x, y, rad)) {
let xp = c.x + c.radius * Math.cos(a);
let yp = c.y + c.radius * Math.sin(a);
let circle = new Circle(x, y, xp, yp, rad, c);
c.c.push(circle);
ca.push(circle);
return true;
}
return false;
};
ctx.fillStyle = "green";
ctx.lineWidth = 5;
var draw = () => {
ctx.clearRect(-canvasSize, -canvasSize, 2 * canvasSize, 2 * canvasSize);
let grown = 0;
for (let i = 0; i < curves.length; i++) { if (curves[i].drawCurve()) grown++; }
drawPoint(0, 0, "silver");
return grown;
};
var stopped = true;
var start = () => {
if (stopped) {
stopped = false;
requestAnimationFrame(animate);
} else stopped = true;
};
var t = 0;
var inc = 3;
var animate = () => {
if (stopped) return;
t += inc;
if (!draw() || t < 0) {
if (inc == 3) inc = -8;
else {
ctx.strokeStyle = "hsla(" + getRandomInt(0, 360) + ", 90%, 60%, 0.75)";
inc = 3;
t = 0;
eg = Math.random() < 0.3;
setCircles();
}
}
requestAnimationFrame(animate);
};
var hue = getRandomInt(0, 360);
var ca = [new Circle(0, 0, 0, 0, 50, 0, 0)];
var curves = [];
var setCircles = () => {
ca = [new Circle(0, 0, 0, 0, 50, 0, 0)];
for (let i = 0; i < 2000; i++) {
let r = 10;
if (i < 20) r = 42;
else if (i < 100) r = 34;
else if (i < 300) r = 26;
else if (i < 1000) r = 18;
grow(r);
}
curves = [];
for (let i = 0; i < ca.length; i++) {
if (ca[i].c.length == 0) {
var nc = new Curve();
nc.car = [ca[i]];
nc.addCurveCircle(ca[i]);
nc.setPath();
curves.push(nc);
}
}
};
onresize();
setCircles();
ctx.strokeStyle = "hsla(" + getRandomInt(0, 360) + ", 90%, 60%, 0.75)";
start();Thanks for visiting