原生js canvas画玫瑰花

Html

Css

body{
      margin-left：200px
}

var canvas = document.getElementsByTagName('canvas')[0];
    var context = canvas.getContext('2d');

var a = context;
    var b = document.body;
    var c = canvas;

document.body.clientWidth;
    var zBuffer = [];
    var SIZE = 777;
    canvas.width = canvas.height = SIZE;
    var h = -350;

function surface(a, b, c) {
        if (c > 60) {
            return {
                x : Math.sin(a * 7) * (13 + 5 / (.2 + Math.pow(b * 4, 4)))  - Math.sin(b) * 50,
                y : b * SIZE + 50,
                z : 625 + Math.cos(a * 7)   * (13 + 5 / (.2 + Math.pow(b * 4, 4))) + b * 400,
                r : a * 1 - b / 2,  g : a  };
        }

var A = a * 2 - 1;
        var B = b * 2 - 1;

if (A * A + B * B < 1) {
            if (c > 37) {
                var j = c & 1;
                var n = j ? 6 : 4;
                var o = .5 / (a + .01) + Math.cos(b * 125) * 3 - a * 300;
                var w = b * h;
                return {
                    x : o * Math.cos(n) + w * Math.sin(n) + j * 610 - 390,
                    y : o * Math.sin(n) - w * Math.cos(n) + 550 - j * 350,
                    z : 1180 + Math.cos(B + A) * 99 - j * 300,
                    r : .4  - a  * .1   + Math.pow(1 - B * B, -h * 6)  * .15  - a  * b  * .4   + Math.cos(a + b)  / 5   + Math.pow(Math.cos((o * (a + 1) + (B > 0 ? w  : -w)) / 25), 30) * .1 * (1 - B * B),  g : o / 1e3 + .7 - o * w * 3e-6
                };
            }

if (c > 32) {
                c = c * 1.16 - .15;
                var o = a * 45 - 20;
                var w = b * b * h;
                var z = o * Math.sin(c) + w * Math.cos(c) + 620;
                return {
                    x : o * Math.cos(c) - w * Math.sin(c),
                    y : 28 + Math.cos(B * .5) * 99 - b * b * b * 60 - z / 2  - h,
                    z : z,
                    r : (b * b * .3 + Math.pow((1 - (A * A)), 7) * .15 + .3)  * b,
                    g : b * .7
                };
            }

var o = A * (2 - b) * (80 - c * 2);
            var w = 99 - Math.cos(A) * 120 - Math.cos(b) * (-h - c * 4.9)  + Math.cos(Math.pow(1 - b, 7)) * 50 + c * 2;
            var z = o * Math.sin(c) + w * Math.cos(c) + 700;
            return {
                x : o * Math.cos(c) - w * Math.sin(c),
                y : B * 99 - Math.cos(Math.pow(b, 7)) * 50 - c / 3 - z  / 1.35 + 450,  z : z,
                r : (1 - b / 1.2) * .9 + a * .1,
                g : Math.pow((1 - b), 20) / 4 + .05
            };
        }
    }

setInterval(function() {
        for ( var i = 0; i < 10000; i++) {
            var part = i % 46;
            var c = part / .74;
            var point = surface(Math.random(), Math.random(), c);
            if (point) {
                var z = point.z;
                var x = parseInt(point.x * SIZE / z - h);
                var y = parseInt(point.y * SIZE / z - h);
                var zBufferIndex = y * SIZE + x;
                if ((typeof zBuffer[zBufferIndex] === "undefined")  || (zBuffer[zBufferIndex] > z)) {
                    zBuffer[zBufferIndex] = z;
                    var r = -parseInt(point.r * h);  var g = -parseInt(point.g * h);
                    var b = -parseInt(point.r * point.r * -80);
                    context.fillStyle = "rgb(" + r + "," + g + "," + b  + ")";
                    context.fillRect(x, y, 1, 1);
                }
            }
        }
    }, 0);

↑上面代码改变，会自动显示代码结果 jQuery调用版本：1.11.3

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原生js canvas画玫瑰花



代码描述：利用canvas画布做渐变画玫瑰花，原生js

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purple0

2018/9/28 17:00:12

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关紫秋-贞观互联0

2018/4/23 9:26:06

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