Black hole special effects of HTML5+Canvas
Black hole special effects of HTML5+Canvas
<html>
<head>
<meta charset="utf-8">
<title>不要失去你的彩虹</title>
<style>
canvas {
? position: absolute;
? top: 0;
? left: 0;
}
</style>
</head>
<body>
<canvas id=c></canvas>
<script>
let w = c.width = window.innerWidth;
let h = c.height = window.innerHeight;
const ctx = c.getContext('2d');
const opts = {
? ? hexLength: 30,
? ? lenFn: ({ len, t }) =>
? ? ? len Math.sin(t),
? ? radFn: ({ rad, len, t, excitement }) =>
? ? ? rad (excitement opts.propFn({ len, t }))*2 / 4,
? ? propFn: ({ len, t }) =>?
? ? ? len / opts.hexLength / 10 - t,
? ? excitementFn: ({ len, t }) =>
? ? ? ?Math.sin(opts.propFn({ len, t }))**2,
? ? colorFn: ({ rad, excitement, t }) =>?
? ? ? `hsl(${rad / Math.TAU * 360 t}, ${excitement * 100}%, ${20 excitement * 50}%)`,
? ? timeStep: .01,
? ? randomJig: 8,
??
? ? repaintColor: 'rgba(0,0,0,.1)'
? };
let tick = 0;
Math.TAU = 6.28318530717958647692;
const vertices = [];
class Vertex {
? constructor({ x, y }) {
? ? this.len = Math.sqrt(x*x y*y);
? ? this.rad = Math.acos(x / this.len) * (y > 0 ? 1 : -1) .13;
? ? this.prevPoint = { x, y };
? }
??
? step() {
? ? const excitement = opts.excitementFn({ len: this.len, t: tick });
? ? const param = {?
? ? ? len: this.len,
? ? ? rad: this.rad,
? ? ? t: tick,
? ? ? excitement
? ? };
? ? const nextLen = opts.lenFn(param);
? ? const nextRad = opts.radFn(param);
? ? const color = opts.colorFn(param);
? ??
? ? ctx.strokeStyle = color;
? ? ctx.lineWidth = excitement .2;
? ? ctx.beginPath();
? ? ctx.moveTo(this.prevPoint.x, this.prevPoint.y);
? ? this.prevPoint.x = nextLen * Math.cos(nextRad) ?
? ? ? Math.random() * (1-excitement)**2 * opts.randomJig * 2 - opts.randomJig;
? ? this.prevPoint.y = nextLen * Math.sin(nextRad)
? ? ? Math.random() * (1-excitement)**2 * opts.randomJig * 2 - opts.randomJig;
? ? ctx.lineTo(this.prevPoint.x, this.prevPoint.y);
? ? ctx.stroke();
? }
??
? static gen() {
? ? vertices.length = 0;?
? ? const hexCos = Math.cos(Math.TAU / 12) * opts.hexLength;
? ? const hexSin = Math.sin(Math.TAU / 12) * opts.hexLength;
??
? ? let alternanceX = false;
? ? for(let x = 0; x < w; x = hexCos) {
? ? ? let alternance = alternanceX = !alternanceX;
? ? ? for(let y = 0; y < h; y = hexSin opts.hexLength) {
? ? ? ? alternance = !alternance;
? ? ? ? vertices.push(new Vertex({
? ? ? ? ? x: x - w / 2,
? ? ? ? ? y: y alternance * hexSin - h / 2
? ? ? ? }))
? ? ? }
? ? }
? ??
? }
}
Vertex.gen();
ctx.fillStyle = '#222';
ctx.fillRect(0, 0, w, h);
const anim = () => {
? window.requestAnimationFrame(anim);
??
? tick = opts.timeStep;
??
? ctx.fillStyle = opts.repaintColor;
? ctx.fillRect(0, 0, w, h);
??
? ctx.translate(w/2, h/2);
? vertices.forEach((vertex) => vertex.step());
? ctx.translate(-w/2, -h/2);
}
anim();
window.addEventListener('resize', () => {
? w = c.width = window.innerWidth;
? h = c.height = window.innerHeight;
??
? Vertex.gen();
? tick = 0;
? ctx.fillStyle = '#222';
? ctx.fillRect(0, 0, w, h);
})
</script>
</body>
</html>
這是一個(gè)HTML5 Canvas的黑洞特效，需要的朋友可以直接下載使用，更多特效代碼盡在PHP中文網(wǎng)。
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