canvas彩色粒子流动动画效果代码
代码语言:html
所属分类:粒子
代码描述:canvas彩色粒子流动动画效果代码
下面为部分代码预览,完整代码请点击下载或在bfwstudio webide中打开
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
</head>
<body>
<script >
"use strict";
const {
PI,
cos,
sin,
tan,
abs,
sqrt,
pow,
min,
max,
ceil,
floor,
round,
random,
atan2
} = Math;
const HALF_PI = 0.5 * PI;
const QUART_PI = 0.25 * PI;
const TAU = 2 * PI;
const TO_RAD = PI / 180;
const G = 6.67 * pow(10, -11);
const EPSILON = 2.220446049250313e-16;
const rand = n => n * random();
const randIn = (_min, _max) => rand(_max - _min) + _min;
const randRange = n => n - rand(2 * n);
const fadeIn = (t, m) => t / m;
const fadeOut = (t, m) => (m - t) / m;
const fadeInOut = (t, m) => {
let hm = 0.5 * m;
return abs((t + hm) % m - hm) / hm;
};
const dist = (x1, y1, x2, y2) => sqrt(pow(x2 - x1, 2) + pow(y2 - y1, 2));
const angle = (x1, y1, x2, y2) => atan2(y2 - y1, x2 - x1);
const lerp = (a, b, amt) => (1 - amt) * a + amt * b;
const vh = p => p * window.innerHeight * 0.01;
const vw = p => p * window.innerWidth * 0.01;
const vmin = p => min(vh(p), vw(p));
const vmax = p => max(vh(p), vw(p));
const clamp = (n, _min, _max) => min(max(n, _min), _max);
const norm = (n, _min, _max) => (n - _min) / (_max - _min);
Array.prototype.lerp = function(t = [], a = 0) {
this.forEach((n, i) => (this[i] = lerp(n, t[i], a)));
};
Float32Array.prototype.get = function(i = 0, n = 0) {
const t = i + n;
let r = [];
for (; i < t; i++) {
r.push(this[i]);
}
return r;
};
class ParticleArray {
constructor(count = 0, props = []) {
this.count = count;
this.props = props;
this.values = new Float32Array(count * props.length);
}
get length() {
return this.values.length;
}
set(a = [], i = 0) {
this.values.set(a, i);
}
setMap(o = {}, i = 0) {
this.set(Object.values(o), i);
}
get(i = 0) {
return this.values.get(i, this.props.length);
}
getMap(i = 0) {
return this.get(i).reduce(
(r, v, i) => ({
...r,
...{ [this.props[i]]: v }
}),
{}
);
}
}
</script>
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/simplex-noise.min.js"></script>
<s.........完整代码请登录后点击上方下载按钮下载查看
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