Cette fois, je vais vous apporter JS+HTML5 pour créer une animation de flux de particules liée à la souris. Quelles sont les précautions pour créer une animation de flux de particules liée à la souris avec JS+HTML5. . Levez-vous et jetez un œil.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset=gbk>
<title>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;
top: 50%;
left: 50%;
width: 1px;
height: 1px;
overflow: visible;
}
#canvasContainer {
position: absolute;
width: 1000px;
height: 560px;
top: -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-top:4px;
}
#footer{
font-size: 0.6em;
font-family: Arial, Helvetica, sans-serif;
position: absolute;
bottombottom:8px;
width:98%;
}
</style>
</head>
<body>
<p id="outer">
<p id="canvasContainer">
<canvas id="mainCanvas" width="1000" height="560"></canvas>
<p id="output"></p>
</p>
</p>
<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 canvasp;
var outerp;
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 Internet Explorer 9.");
}
}
function setup(){
outerp = document.getElementById("outer");
canvasp = 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 blowAcc = ( 1 - ( d / blowDist ) ) * 14;
vX += dX * blowAcc + 0.5 - Mrnd();
vY += dY * blowAcc + 0.5 - Mrnd();
}
}
if ( d < toDist ){
var toAcc = ( 1 - ( d / toDist ) ) * canvasW * 0.0014;
vX -= dX * toAcc;
vY -= dY * toAcc;
}
if ( d < stirDist ){
var mAcc = ( 1 - ( d / stirDist ) ) * canvasW * 0.00026;
vX += mouseVX * mAcc;
vY += mouseVY * mAcc;
}
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 - outerp.offsetLeft - canvasp.offsetLeft;
mouseY = ev.clientY - outerp.offsetTop - canvasp.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>Je pense que vous maîtrisez la méthode après avoir lu le cas dans cet article. Pour des informations plus intéressantes, veuillez prêter attention aux autres articles connexes sur le site Web chinois de php !
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