纯js canvas粒子发射器效果可修改参数-html代码-BFW代码库

纯js canvas粒子发射器效果可修改参数

代码语言：html

所属分类：粒子

代码描述：纯js编写，canvas渲染，可修改粒子大小、延迟时间、距离等

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">

<style>
/********************
  Common
********************/

html, body {
  height: 100%;
  width: 100%;
  font-family: Helvetica, verdana, monospace;
  color: #FFFFFF;
  font-size: 100%;
  padding: 0;
  margin: 0;
  letter-spacing: 0.2rem;
  overflow: hidden;
  background: #000;
}

a {
  color: #FFF;
  text-decoration: none;
}

h1 {
  font-size: 1.6rem;
}

p {
  padding: 0.8rem 0;
  font-size: 0.8rem;
}

div#main {
  position: absolute;
  top: 0;
  left: 0;
  padding: 1.6rem;
}

/********************
  Contents
********************/

canvas#canvas {
  background: #000;
}

div#controller {
  display: none;
  height: 100%;
  position: absolute;
  top: 0;
  right: 0;
  background: #0871BC;
  opacity: 0.9;
  overflow-y: scroll;
  z-index: 3;
}

div#controller > dl {
  padding: 0 1.6rem;
}

p#closeController {
  padding: 1.6rem;
}

p#openController {
  background: #0871BC;
  position: fixed;
  right: 0;
  left: 0;
  bottom: 1.6rem;
  margin: auto;
  width: 200px;
  text-align: center;
  z-index: 2;
}
</style>

</head>
<body translate="no">


<div id="contents">
<canvas id="canvas">This browser cannot use a canvas.</canvas>
<p id="openController"><a href="#">修改参数</a></p>
<div id="controller">
<p id="closeController"><a href="#">关闭</a></p>
<dl>
<dt>
<p>Number of Shapes</p>
</dt>
<dd>
<input type="range" id="numberOfShapes" min="1" max="1440" value="720" step="1">
</dd>
<dt>
<p>Shape Max Size</p>
</dt>
<dd>
<input type="range" id="shapeMaxSize" min="1" max="500" value="50" step="1">
</dd>
<dt>
<p>Distance</p>
</dt>
<dd>
<input type="range" id="distance" min="1" max="5" value="2" step="1">
</dd>
<dt>
<p>Delay</p>
</dt>
<dd>
<input type="range" id="delay" min="1" max="1000" value="10" step="1">
</dd>
</dl>
</div>
</div>

<script>
(function () {
  'use strict';
  window.addEventListener('load', function () {
    var canvas = document.getElementById('canvas');

    if (!canvas || !canvas.getContext) {
      return false;
    }

    /********************
        Random Number
      ********************/

    function rand(min, max) {
      return Math.floor(Math.random() * (max - min + 1) + min);
    }

    /********************
        Var
      ********************/

    // canvas 
    var ctx = canvas.getContext('2d');
    var X = canvas.width = window.innerWidth;
    var Y = canvas.height = window.innerHeight;
    // controller 
    var inputs = document.getElementsByTagName('input');
    var shapeMaxSize = document.getElementById('shapeMaxSize');
    var distance = document.getElementById('distance');
    var numberOfShapes = document.getElementById('numberOfShapes');
    var delay = document.getElementById('delay');

    /********************
                                                    Animation
                                                  ********************/

    window.requestAnimationFrame =
    window.requestAnimationFrame ||
    window.mozRequestAnimationFrame ||
    window.webkitRequestAnimationFrame ||
    window.msRequestAnimationFrame ||
    function (cb) {
      setTimeout(cb, 17);
    };

    /********************
         Shape
       ********************/

    // var
    var shapeNum = numberOfShapes.value;
    var shapes = [];
    var polygons = [0, 3, 4, 5];
    var composite = ['lighter', 'xor'];
    var delayNum = delay.value;
    var shapePushIntId;

    function Shape(ctx, x, y, r, a) {
      this.ctx = ctx;
      this.init(x, y, r, a);
    }

    Shape.prototype.init = function (x, y, r, a) {
      this.poly = polygons[rand(0, polygons.length - 1)];
      this.comp = composite[rand(0, composite.length - 1)];
      this.rad = Math.PI / this..........完整代码请登录后点击上方下载按钮下载查看