sketch实现宇宙绚丽流星旋转效果-html代码-BFW代码库

sketch实现宇宙绚丽流星旋转效果

代码语言：html

所属分类：动画

代码描述：sketch实现宇宙绚丽流星旋转效果

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="zh">
<head>
    <meta charset="UTF-8">


    <style type="text/css">
        body {
            background: #000;
        }

        canvas {
            display: block;
        }

        #gui {
            left: 0;
            position: fixed;
            top: 0;
        }


    </style>
    <!--[if IE]>
    		<script src="http://libs.baidu.com/html5shiv/3.7/html5shiv.min.js"></script>
    	<![endif]-->
</head>
<body>
    <div class="htmleaf-container">
    
        <div id="gui"></div>
    </div>
    <script type="text/javascript" src="http://repo.bfw.wiki/bfwrepo/js/jquery-3.2.1.min.js"></script>
    <script type="text/javascript" src="http://repo.bfw.wiki/bfwrepo/js/dat.gui-min.js"></script>
   <script type="text/javascript" src="http://repo.bfw.wiki/bfwrepo/js/sketch.min.js"></script>
    <script>
        var sketch = Sketch.create(), center = {
            x: sketch.width / 2,
            y: sketch.height / 2
        }, orbs = [], dt = 1, opt = {
            total: 0,
            count: 100,
            spacing: 2,
            speed: 65,
            scale: 1,
            jitterRadius: 0,
            jitterHue: 0,
            clearAlpha: 10,
            toggleOrbitals: true,
            orbitalAlpha: 100,
            toggleLight: true,
            lightAlpha: 5,
            clear: function () {
                sketch.clearRect(0, 0, sketch.width, sketch.height),
                orbs.length = 0;
            }
        };
        var Orb = function (x, y) {
            var dx = x / opt.scale - center.x / opt.scale,
            dy = y / opt.scale - center.y / opt.scale;
            this.angle = atan2(dy, dx);
            this.lastAngle = this.angle;
            this.radius = sqrt(dx * dx + dy * dy);
            this.size = this.radius / 300 + 1;
            this.speed = random(1, 10) / 300000 * this.radius + 0.015;
        };
        Orb.prototype.update = function () {
            this.lastAngle = this.angle;
            this.angle += this.speed * (opt.speed / 50) * dt;
            this.x = this.radius * cos(this.angle);
            this.y = this.radius * sin(this.angle);
        };
        Orb.prototype.render = function () {
            if (opt.toggleOrbitals) {
                var radius = opt.jitterRadius === 0 ? this.radius: this.radius + random(-opt.jitterRadius, opt.jitterRadius);
                radius = opt.jitterRadius != 0 && radius < 0 ? 0.001: radius;
                sketch.strokeStyle = 'hsla( ' + ((this.angle + 90) / (PI / 180) + random(-opt.jitterHue, opt.jitterHue)) + ', 100%, 50%, ' + opt.orbitalAlpha / 100 + ' )';
                sketch.lineWidth = this.size;
                sketch.beginPath();
                if (opt.speed >= 0) {
                    sketch.arc(0, 0, radius, this.lastAngle, this.angle + 0.001, false);
                } else {
                    sketch.arc(0, 0, radius, this.angle, this.lastAngle + 0.001, false);
                };
                sketch.stroke();
                sketch.closePath();
            };
            if (opt.toggleLight) {
                sketch.lineWidth = 0.5;
                sketch.strokeStyle = 'hsla( ' + ((this.angle + 90) / (PI / 180) + random(-opt.jitterHue, opt.jitterHue)) + ', 100%,.........完整代码请登录后点击上方下载按钮下载查看