钱柜娱乐手机客户端:html5教程制作简单画板代码分享,粒子效果演示

钱柜娱乐手机客户端:html5教程制作简单画板代码分享,粒子效果演示

HTML5制作简便画板

#dv {
width: 100px;
height: 100px;
background-color: blue;
border-radius: 50%;
position: absolute;
}
</style>
</head>
<body>
<div onmousedown=”mouseDown(this,event)” onmousemove=”mouseMove”
onmouseup=”mouseUp”></div>
<script>//那个是网络摘录的。
var mouseX, mouseY,div;
var objX, objY;
var isDowm = false;
function mouseDown {
div = obj;
obj.style.cursor = “move”;
objX = div.offsetLeft;
objY = div.offsetTop;
mouseX = e.clientX;
mouseY = e.clientY;
isDowm = true;
}
function mouseMove {

粒子效果演示,粒子演示

<!DOCTYPE html>
<html lang=”en”>
<head>
<meta charset=utf-8>
<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>
<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 Internet 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 blowAcc = ( 1 – ( d / blowDist ) ) * 14;
vX += dX * blowAcc + 0.5 – Mrnd();
vY += dY * blowAcc + 0.5 – Mrnd();
}
}

钱柜娱乐手机客户端:html5教程制作简单画板代码分享,粒子效果演示。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 – 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>

!DOCTYPE html html
lang=”en” head meta charset=utf-8 title 粒子效果演示 /title meta
name=”description” content=”HTML5/canvas demo, 500 parti…

钱柜娱乐手机客户端 1

<!doctype html>
<html>
<head>
<meta charset=”utf-8″>
<title>JS拖拽div-jq22.com</title>
<script
src=”;
<style>

//按下鼠标
$(“#draw”).mousedown(function(e){
//无误坐标
var mouseX=e.pageX-this.offsetLeft;
var mouseY=e.pageY-this.offsetTop;
draw.moveTo(mouseX,mouseY);
godraw=true;</p> <p> })
//松开鼠标
$(“#draw”).mouseup(function(e){
godraw=false;
})
//移动鼠标
$(“#draw”).mousemove(function(e){
if(godraw){
var mouseX=e.pageX-this.offsetLeft;
var mouseY=e.pageY-this.offsetTop;
draw.lineTo(mouseX+4,mouseY+4);
draw.stroke();
}</p> <p> })

dv.style.left = nl + ‘px’;
dv.style.top = nt + ‘px’;
}
function mouseUp {
isDown = false;
dv.style.cursor = ‘default’;
}

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