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原生JS+HTML5实现跟随鼠标一起流动的粒子动画效果

网络编程 2021-07-04 16:45www.168986.cn编程入门
这篇文章主要介绍了原生JS+HTML5实现跟随鼠标一起流动的粒子动画效果,涉及javascript事件响应、数值运算及页面元素属性动态操作相关实现技巧,需要的朋友可以参考下

本文实例讲述了原生JS+HTML5实现跟随鼠标一起流动的粒子动画效果。分享给大家供大家参考，具体如下

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset=gbk>
<title>.jb51. 粒子效果演示</title>
<meta name="description" content="HTML5/canvas demo, 500 particles to play around with." />
<meta name="keywords" content="html5,canvas,javascript,particles,interactive,velocity,programming,flash" />
<style type="text/css">
html, body {
text-align: center;
margin:0;
padding:0;
background: #000000;
color: #666666;
line-height: 1.25em;
}
#outer {
position: absolute;
: 50%;
left: 50%;
width: 1px;
height: 1px;
overflow: visible;
}
#canvasContainer {
position: absolute;
width: 1000px;
height: 560px;
: -280px;
left: -500px;
}
canvas {
border: 1px solid #333333;
}
a {
color: #00CBCB;
text-decoration:none;
font-weight:bold;
}
a:hover {
color:#FFFFFF;
}
#output {
font-family: Arial, Helvetica, sans-serif;
font-size: 0.75em;
margin-:4px;
}
#footer{
font-size: 0.6em;
font-family: Arial, Helvetica, sans-serif;
position: absolute;
bottombottom:8px;
width:98%;
}
</style>
</head>
<body>
<div id="outer">
<div id="canvasContainer">
<canvas id="mainCanvas" width="1000" height="560"></canvas>
<div id="output"></div>
</div>
</div>
<script type="text/javascript">
//javascript部分
(function(){
var PI_2 = Math.PI  2;
var canvasW = 1000;
var canvasH = 560;
var numMovers = 600;
var friction = 0.96;
var movers = [];
var canvas;
var ctx;
var canvasDiv;
var outerDiv;
var mouseX;
var mouseY;
var mouseVX;
var mouseVY;
var prevMouseX;
var prevMouseY;
var isMouseDown;
function init(){
canvas = document.getElementById("mainCanvas");
if ( canvas.getContext ){
setup();
setInterval( run , 33 );
trace('你们好');
}
else{
trace("Sorry, needs a recent version of Chrome, Firefox, Opera, Safari, or Inter Explorer 9.");
}
}
function setup(){
outerDiv = document.getElementById("outer");
canvasDiv = document.getElementById("canvasContainer");
ctx = canvas.getContext("2d");
var i = numMovers;
while ( i-- ){
var m = new Mover();
m.x = canvasW  0.5;
m.y = canvasH  0.5;
m.vX = Math.cos(i)  Math.random()  34;
m.vY = Math.sin(i)  Math.random()  34;
movers[i] = m;
}
mouseX = prevMouseX = canvasW  0.5;
mouseY = prevMouseY = canvasH  0.5;
document.onmousedown = onDocMouseDown;
document.onmouseup = onDocMouseUp;
document.onmousemove = onDocMouseMove;
}
function run(){
ctx.globalCompositeOperation = "source-over";
ctx.fillStyle = "rgba(8,8,12,0.65)";
ctx.fillRect( 0 , 0 , canvasW , canvasH );
ctx.globalCompositeOperation = "lighter";
mouseVX = mouseX - prevMouseX;
mouseVY = mouseY - prevMouseY;
prevMouseX = mouseX;
prevMouseY = mouseY;
var toDist = canvasW  0.86;
var stirDist = canvasW  0.125;
var blowDist = canvasW  0.5;
var Mrnd = Math.random;
var Mabs = Math.abs;
var i = numMovers;
while ( i-- ){
var m = movers[i];
var x = m.x;
var y = m.y;
var vX = m.vX;
var vY = m.vY;
var dX = x - mouseX;
var dY = y - mouseY;
var d = Math.sqrt( dX  dX + dY  dY ) || 0.001;
dX /= d;
dY /= d;
if ( isMouseDown ){
if ( d < blowDist ){
var blowA = ( 1 - ( d / blowDist ) )  14;
vX += dX  blowA + 0.5 - Mrnd();
vY += dY  blowA + 0.5 - Mrnd();
}
}
if ( d < toDist ){
var toA = ( 1 - ( d / toDist ) )  canvasW  0.0014;
vX -= dX  toA;
vY -= dY  toA;
}
if ( d < stirDist ){
var mA = ( 1 - ( d / stirDist ) )  canvasW  0.00026;
vX += mouseVX  mA;
vY += mouseVY  mA;
}
vX = friction;
vY = friction;
var avgVX = Mabs( vX );
var avgVY = Mabs( vY );
var avgV = ( avgVX + avgVY )  0.5;
if( avgVX < .1 ) vX = Mrnd()  3;
if( avgVY < .1 ) vY = Mrnd()  3;
var sc = avgV  0.45;
sc = Math.max( Math.min( sc , 3.5 ) , 0.4 );
var nextX = x + vX;
var nextY = y + vY;
if ( nextX > canvasW ){
nextX = canvasW;
vX = -1;
}
else if ( nextX < 0 ){
nextX = 0;
vX = -1;
}
if ( nextY > canvasH ){
nextY = canvasH;
vY = -1;
}
else if ( nextY < 0 ){
nextY = 0;
vY = -1;
}
m.vX = vX;
m.vY = vY;
m.x = nextX;
m.y = nextY;
ctx.fillStyle = m.color;
ctx.beginPath();
ctx.arc( nextX , nextY , sc , 0 , PI_2 , true );
ctx.closePath();
ctx.fill();
}
}
function onDocMouseMove( e ){
var ev = e ? e : window.event;
mouseX = ev.clientX - outerDiv.offsetLeft - canvasDiv.offsetLeft;
mouseY = ev.clientY - outerDiv.offsetTop - canvasDiv.offsetTop;
}
function onDocMouseDown( e ){
isMouseDown = true;
return false;
}
function onDocMouseUp( e ){
isMouseDown = false;
return false;
}
function Mover(){
this.color = "rgb(" + Math.floor( Math.random()255 ) + "," + Math.floor( Math.random()255 ) + "," + Math.floor( Math.random()255 ) + ")";
this.y = 0;
this.x = 0;
this.vX = 0;
this.vY = 0;
this.size = 1;
}
function rect( context , x , y , w , h ){
context.beginPath();
context.rect( x , y , w , h );
context.closePath();
context.fill();
}
function trace( str ){
document.getElementById("output").innerHTML = str;
}
window.onload = init;
})();
</script>
</body>
</html>

这里使用本站HTML/CSS/JS在线运行测试工具，可得到如下测试运行效果

更多关于JavaScript相关内容感兴趣的读者可查看本站专题《》、《》、《》、《》、《》、《》及《》

希望本文所述对大家JavaScript程序设计有所帮助。

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