HTML5中怎么用Canvas实现3D水体模拟动画

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JavaScript

语言：

JaveScriptBabelCoffeeScript

确定

var canvas, ctx, tim, bai;

canvas = document.getElementsByTagName('canvas')[0];

ctx = canvas.getContext('2d');

canvas.width = canvas.height = 400;

aaa();

function aaa() {

var a, b, c, s, p, r, x, y, z, x1, y1, max, p2, han, h, pt, hei;

ctx.globalCompositeOperation = "source-over";

ctx.fillStyle = "rgb(0,0,0)";

ctx.fillRect(0, 0, canvas.width, canvas.height);

ctx.globalCompositeOperation = "lighter";

tim = new Date().getTime() / 10;

ctx.strokeStyle = ctx.fillStyle = "hsla(244,60%,60%,0.3)";

bai = 0.6 + Math.sin(tim / 471) * 0.2;

hei = 0.9 + Math.sin(tim / 100) * 0.3;

pt = [];

for (c = 0; c < 180; c++) {

s = (c + 1) / 180;

han = Math.cos(s * Math.PI / 2);

h = Math.sin(s * Math.PI / 2);

s = 1 - s;

p = [];

max = (100 * han) | 0;

r = 0;

for (a = 0; a < max; a++) {

x = Math.cos(r) * han;

y = Math.sin(r) * han;

z = nami(r, s);

x -= z * s;

p.push([x, y, hei + z * s + h]);

r += Math.PI * 2 / max;

}

pt.push(p);

}

for (c = 0; c < 100; c++) {

s = (c + 1) / 100;

p = [];

max = 100 * s;

r = 0;

for (a = 0; a < max; a++) {

x = Math.cos(r) * s;

y = Math.sin(r) * s;

z = nami(r, s);

x -= z * s;

p.push([x, y, hei + z * s]);

r += Math.PI * 2 / max;

}

pt.push(p);

}

for (c = 0; c < pt.length; c++) {

p = pt[c];

p2 = [];

for (a = 0; a < p.length; a++) {

x = p[a][0];

y = p[a][1];

z = p[a][2];

b = Math.pow(1.5, y / 2);

x1 = x * b * 150 + 200;

y1 = z * b * 200 - hei * 200 + 150;

p2.push([x1, y1]);

}

ctx.beginPath();

for (a = 0; a < p2.length; a++) ctx.lineTo(p2[a][0], p2[a][1]);

ctx.closePath();

ctx.stroke();

}

requestAnimationFrame(aaa);

}

function nami(r, s) {

var a = Math.sin(r * 2 - tim / 13 + s * 13) / 20 +

Math.sin(r * 5 - tim / 17 + s * 13) / 20 +

Math.sin(r * 7 - tim / 19 + s * 13) / 40;

return a * bai;

}

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