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人物可以移动实例js--offset.top/left

2014-08-14 12:10 260 查看
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<head>
<meta charset="UTF-8">
<title>canvas元素示例</title>
<script type="text/javascript"
src="<%=request.getContextPath()%>/js/jquery-1.9.1.js"></script>
<script type="text/javascript">

function draw(id) {
var canvas = document.getElementById(id);
if (canvas == null)
return false;
var context = canvas.getContext('2d');
context.fillStyle = "#EEEEFF"; //設置顏色
context.fillRect(0, 0, 400, 300); //畫正方形
context.fillStyle = "red"; //顏色
context.strokeStyle = "blue"; //邊框顏色
context.lineWidth = 1;//邊框線寬度
context.fillRect(50, 50, 100, 100);
context.strokeRect(50, 50, 100, 100);

var img = new Image();
img.src="<%=request.getContextPath()%>/img/game/askway/a.jpg";
context.drawImage(img,0,0);

setInterval(move,50);
}
var j=1;
var z=1;
function move()
{
$("#part3").css("background-position",-(120 * (j+1)+70*j)+"px "+-(93*z+100*z)+"px");
j++;
if(j==6){
j=0;
z++;
}
if(z==3){
j=0;
z=0;
}
}

var i=50;
function rehua(){
setInterval(redraw,30);
}
function redraw(){
//var context = $("#canvas").getContext("2d");
var context = document.getElementById("canvas").getContext("2d");
context.clearRect(0, 0, 400, 300);
var img = new Image();
img.src="<%=request.getContextPath()%>/img/game/askway/a.jpg";
context.drawImage(img, i, i);
i++;
}

function renrehua(){
/* alert($("#part5").position().top);
alert($("#part5").position().left);
alert($("#part5").offset().left);
alert($("#part5").offset().top); */
setInterval(zoulu,100);
}
var k=1;
var l = 0;
function zoulu(){
//alert($("#part5").css("left"));  //auto
//alert($("#part5").offsetLeft);  //undifined

$("#part5").css("background-position",-(35+k*70+60*k)+"px "+-(15+l*100+l*35)+"px");
k++;
if(k==4){
k=0;
}

$("#part5").css("left",$("#part5").position().left+5);
//alert($("#part5").position().left);
}
</script>
<style type="text/css">
#part1 {
border: solid 1px blue;
width: 90px;
height: 68px;
background-image: url(<%=request.getContextPath()%>/img/game/askway/a.jpg);
background-repeat: no-repeat;
display: none;
}

#part2 {
border: solid 1px blue;
width: 90px;
height: 68px;
background-image: url(<%=request.getContextPath()%>/img/game/askway/a.jpg);
background-repeat: no-repeat;
background-position: 50% 50%;
display: none;
}

#part3 {
border: solid 1px blue;
width: 70px; /* 960  576  192 192*/
height: 100px;
background-image: url(<%=request.getContextPath()%>/img/game/askway/b.png);
background-repeat: no-repeat;
background-attachment: fixed;
background-position: -120px -0px;
/* background-position:10% 5%; */
}
#part4 {
width:500px;
height:400px;
border:blue 1px solid;
/* position:relative; */
}
#part5{
position:absolute;
width:70px;
height:100px;
background-image: url(<%=request.getContextPath()%>/img/game/askway/c.png);
background-repeat: no-repeat;
background-position: -35px -15px;
}

</style>
</head>
<body>
<input type="button" onclick="draw('canvas');" value="移动">
<input type="button" onclick="rehua();" value="持续移动">
<input type="button" onclick="renrehua()" value="人物走动"/>
<div id="part1"></div>
<br>
<div id="part2"></div>
<br>
<div id="part3"></div>
<div id="part4">
<div id="part5"></div>
</div>
<h1>canvas元素示例</h1>
<canvas id="canvas" width="400" height="300" />
</body>
</html>
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