jquery+css实现黑洞粒子穿梭动画效果代码-html代码-BFW代码库

代码语言：html

所属分类：粒子

代码描述：jquery+css实现黑洞粒子穿梭动画效果代码，点击左键试试效果。

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="en">

<head>
    <meta charset="UTF-8">
<link type="text/css" rel="stylesheet" href="//repo.bfw.wiki/bfwrepo/css/reset.min.css">
<style>
    body, html {
  height: 100%;
}

body {
  height: 100%;
  background-color: #191919;
}

#blackhole {
  height: 100%;
  width: 100%;
  position: relative;
  display: flex;
}

.centerHover {
  width: 255px;
  height: 255px;
  background-color: transparent;
  border-radius: 50%;
  position: absolute;
  left: 50%;
  top: 50%;
  margin-top: -128px;
  margin-left: -128px;
  z-index: 2;
  cursor: pointer;
  line-height: 255px;
  text-align: center;
  transition: all 500ms;
}
.centerHover.open {
  opacity: 0;
  pointer-events: none;
}
.centerHover:hover span {
  color: #DDD;
}
.centerHover:hover span:before {
  background-color: #DDD;
}
.centerHover:hover span:after {
  background-color: #DDD;
}
.centerHover span {
  color: #666;
  font-family: serif;
  font-size: 18px;
  position: relative;
  transition: all 500ms;
}
.centerHover span:before {
  content: "";
  display: inline-block;
  height: 1px;
  width: 16px;
  margin-right: 12px;
  margin-bottom: 4px;
  background-color: #666;
  transition: all 500ms;
}
.centerHover span:after {
  content: "";
  display: inline-block;
  height: 1px;
  width: 16px;
  margin-left: 12px;
  margin-bottom: 4px;
  background-color: #666;
  transition: all 500ms;
}

canvas {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  margin: auto;
}
</style>
</head>

<body>
    <!-- partial:index.partial.html -->
    <div id="blackhole">
        <div class="centerHover"><span>ENTER</span></div>
    </div>
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/jquery-3.2.1.min.js"></script>
    <script>
        
        blackhole('#blackhole');



function blackhole(element) {
	var h = $(element).height(),
	    w = $(element).width(),
	    cw = w,
	    ch = h,
	    maxorbit = 255, // distance from center
	    centery = ch/2,
	    centerx = cw/2;

	var startTime = new Date().getTime();
	var currentTime = 0;

	var stars = [],
	    collapse = false, // if hovered
	    expanse = false; // if clicked

	var canvas = $('<canvas/>').attr({width: cw, height: ch}).appendTo(element),
	    context = canvas.get(0).getContext("2d");

	context.globalCompositeOperation = "multiply";

	function setDPI(canvas, dpi) {
		// Set up CSS size if it's not set up already
		if (!canvas.get(0).style.width)
			canvas.get(0).style.width = canvas.get(0).width + 'px';
		if (!canvas.get(0).style.height)
			canvas.get(0).style.height = canvas.get(0).height + 'px';

		var scaleFactor = dpi / 96;
		canvas.get(0).width = Math.ceil(canvas.get(0).width * scaleFactor);
		canvas.get(0).height = Math.ceil(canvas.get(0).height * scaleFactor);
		var ctx = canvas.get(0).getContext('2d');
		ctx.scale(scaleFactor, scaleFactor);
	}

	function rotate(cx, cy, x, y, angle) {
		var radians = angle,
		    cos = Math.cos(radians),
		    sin = Math.sin(radians),
		    nx = (cos * (x - cx)) + (sin * (y - cy)) + cx,
		    ny = (cos * (y - cy)) - (sin * (x - cx)) + cy;
		return [nx, ny];
	}

	setDPI(canvas, 192);

	var star = function(){

		// Get a weighted random number, so that the majority of stars will form in the center of the orbit
		var rands = [];
		rands.push(Math.random() * (maxorbit/2) + 1);
		rands.push(Math.random() * (maxorbit/2) + maxorbit);

		this.orbital = (rands.reduce(function(p, c) {
			return p + c;
		}, 0) / rands.length);
		// Done getting that random number, it's stored in this.orbital

		this.x = centerx; // All of these stars are at the center x position at all times
		this.y = centery + this.orbital; // Set Y position starting at the center y + the position in the orbit

		this.yOrigin = centery + this.orbital;  // this is used to track the particles origin

		this.speed = (Math.floor(Math.random() * 2.5) + 1.5)*Math.PI/180; // The rate at which this star will orbit
		th.........完整代码请登录后点击上方下载按钮下载查看