canvas图片滚动

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<title>HTML5 Images Slider</title>
<script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
<script src="test.js"></script>
<link href="style.css" rel="stylesheet" />
<script>
var images = new Array();
var cIndex = 0;
var speed = 5;
var context;
var canvas;
var currentImage;
var width=300;
var height=300;
var stopX = 95;
var stopY = 0;
var autoTimeout;
var manuTimeout;
var interval;
var img1;
var img2;
var img3;
var img4;
var timeoutInterval = 5;

function slideImage(id,x,y,imgObj){
this.speed = speed;
this.preImage = null;
this.nextImage = null;
this.imgObj=imgObj;
this.x=x;
this.y=y;
this.direction="right";
this.id = id;
}

function buttonNext(x,y,bwidth,bheight){
this.x = x;
this.y = y;
this.width = bwidth;
this.height = bheight;
}

$(document).ready(
function(){
InitImages();
canvas = document.getElementById("imgs");
context = canvas.getContext("2d");
//移动图片
context.drawImage(currentImage.imgObj,currentImage.x,currentImage.y,width,height);
context.drawImage(currentImage.preImage.imgObj,currentImage.preImage.x,currentImage.preImage.y,width,height);
context.drawImage(currentImage.nextImage.imgObj,currentImage.nextImage.x,currentImage.nextImage.y,width,height);
context.fillStyle="rgba(100,150,185,0.5)";
context.fillRect(0,0,100,height);
context.fillRect(400,0,100,height);
interval = setTimeout("intervalSlide()", 20);
}
);

function drawFrame(){
context.clearRect(0,0,canvas.width,canvas.height);
//调用beginPath()确保不会接着上次绘制的图形绘制
context.beginPath();
context.drawImage(currentImage.imgObj,currentImage.x,currentImage.y,width,height);
context.drawImage(currentImage.preImage.imgObj,currentImage.preImage.x,currentImage.preImage.y,width,height);
context.drawImage(currentImage.nextImage.imgObj,currentImage.nextImage.x,currentImage.nextImage.y,width,height);
context.drawImage(currentImage.preImage.preImage.imgObj,currentImage.preImage.preImage.x,currentImage.preImage.preImage.y,width,height);
//遮罩
context.fillStyle="rgba(100,150,185,0.5)";
context.fillRect(0,0,100,height);
context.fillRect(400,0,100,height);
//每一帧的位置变动
currentImage.x -= speed;
currentImage.preImage.x -= speed;
currentImage.nextImage.x -= speed;
currentImage.preImage.preImage.x -= speed;

if(currentImage.x == 200){
currentImage.nextImage.x = 500;
}
//到达指定位置停止变动
if(currentImage.x != stopX){
autoTimeout = setTimeout("drawFrame()",timeoutInterval);
}
else{

}
}

function InitImages(){
img1 = new slideImage("img1",-200,0,document.getElementById("img1"));
img2 = new slideImage("img2",100,0,document.getElementById("img2"));
img3 = new slideImage("img3",400,0,document.getElementById("img3"));
img4 = new slideImage("img4",700,0,document.getElementById("img4"));
img1.preImage = img4;
img1.nextImage = img2;
img2.preImage= img1;
img2.nextImage= img3;
img3.preImage=img2;
img3.nextImage=img4;
img4.preImage = img3;
img4.nextImage = img1;
currentImage=img2;
hilightSelectedImg();
}

function canvasClick(){
currentImage = currentImage.nextImage;
manuTimeout = setTimeout("drawFrame()",timeoutInterval);
}

function intervalSlide(){
currentImage = currentImage.nextImage;
hilightSelectedImg();
autoTimeout = setTimeout("drawFrame()", timeoutInterval);
setTimeout("intervalSlide()", 5000)
}

function hilightSelectedImg(){
img1.imgObj.width = 125;
img1.imgObj.height = 150;
img1.imgObj.style.opacity = 0.5;
img2.imgObj.width = 125;
img2.imgObj.height = 150;
img2.imgObj.style.opacity = 0.5;
img3.imgObj.width = 125;
img3.imgObj.height = 150;
img3.imgObj.style.opacity = 0.5;
img4.imgObj.width = 125;
img4.imgObj.height = 150;
img4.imgObj.style.opacity = 0.5
currentImage.imgObj.width = 150;
currentImage.imgObj.height = 175;
currentImage.imgObj.style.opacity = 1;
}
</script>
<style>
canvas {
border:1px dashed black;
}

.imgGallery{
width:550px;
position:absolute;
height:170px
}

img{
opacity:0.5;
}
</style>
</head>
<body>
<div id="container">
<canvas id="imgs" width="500" height="300" onclick="canvasClick()"></canvas>
</div>
<div class="imgGallery">
<span class="cover"><img src="1.jpg" id="img1" width="125" height="150" onclick="iconClick(this.id)"></span>
<img src="2.jpg" id="img2" width="125" height="150" onclick="iconClick(this.id)">
<img src="3.jpg" id="img3" width="125" height="150" onclick="iconClick(this.id)">
<img src="4.jpg" id="img4" width="125" height="150" onclick="iconClick(this.id)">
</div>
</body>
<footer>
</footer>
</html>

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