html5绘图

这是我在绘图过程中遇到的问题，求助高手帮忙啊。。。
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<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@taglib prefix="s" uri="/struts-tags" %>
<!DOCTYPE html>
<html>
  <head>
    <base href="<%=basePath%>">
     
    <title>My JSP 'index.jsp' starting page</title>
    <script type="text/javascript" src="<%=basePath%>js/jquery-1.9.0.js"></script>
    <script type="text/javascript" src="<%=basePath%>js/my.js"></script>
<script type="text/javascript">
$(document).ready(function(){
    //var ll = "<%=request.getParameter("choiceFileName")%>";
    //var urll = "<%=basePath%>parseXmlAction.action?choiceFileName="+ll;
    //alert(urll);
    var transLength = $(".trans").length;
    var arcLength = $(".arc").length;
    var placeLength = $(".place").length;
    var xP = new Array(placeLength);
    var yP = new Array(placeLength);
    var wP = new Array(placeLength);
    var hP = new Array(placeLength);
     
    var xT = new Array(transLength);
    var yT = new Array(transLength);
    var wT = new Array(transLength);
    var hT = new Array(transLength);
    for(var i=0; i<placeLength; i++){
        xP[i] = $(".place:eq("+i+")").find(".x").text();
        yP[i] = $(".place:eq("+i+")").find(".y").text();
        wP[i] = $(".place:eq("+i+")").find(".w").text();
        hP[i] = $(".place:eq("+i+")").find(".h").text();
    }
    for(var i=0; i<transLength; i++){
        xT[i] = $(".place:eq("+i+")").find(".x").text();
        yT[i] = $(".place:eq("+i+")").find(".y").text();
        wT[i] = $(".place:eq("+i+")").find(".w").text();
        hT[i] = $(".place:eq("+i+")").find(".h").text();
    }
     
    //第一步，获得所有的元素个数
 
    $("#showModel").click(function(){
        DrawTrans(cxt,0,0,50,50);
        //DrawPlace(cxt,200.0,200.0,60.0,40.0);
        for(var j=0; j<placeLength; j++){
            //alert(xP[j]+" "+yP[j]+" "+wP[j]+" "+hP[j]);
            DrawPlace(cxt,xP[j],yP[j],wP[j],hP[j]);
        }
         
        for(var i=0; i<transLength; i++){
             
            DrawTrans(cxt,xT[i],yT[i],wT[i],hT[i]);
        }
 
        //画箭头
        var a1=new window.mapleque.arrow();
        a1.set({x:350,y:300},{x:200,y:200});
        a1.paint(cxt);
         
    });
     
     
});
</script>
  </head>
  <body>
<input type="button" id="showModel" value="生成模型"/>
<br/>
<!-- 
<table>
    <tr>
        <td>
            <canvas id="myCanvas" width="800" height="500" style="border:1px solid #c3c3c3;">
                Your browser does not support the canvas element.
            </canvas>
        </td>
        <td>
            <canvas id="newCanvas" width="800" height="500" style="border:1px solid #c3c3c3;">
                Your browser does not support the canvas element.
            </canvas>
        </td>
    </tr>
</table>
-->
            <canvas id="myCanvas" width="800" height="500" style="border:1px solid #c3c3c3;">
                Your browser does not support the canvas element.
            </canvas>
<hr/>
<table id="table"></table>
<div  id="div" >
        <s:iterator value="hashMap.keySet()" id="message"  status="st"> 
             
            <s:iterator value="hashMap.get(#message)" status="second"> 
                <ul class="<s:property value="#message"/>"> <s:property value="#message"/>
                <li class="id"><s:property value="id"/></li>
                <li class="text"><s:property value="text"/></li>
                <li class="x"><s:property value="x"/></li>
                <li class="y"><s:property value="y"/></li>
                <li class="w"><s:property value="w"/></li>
                <li class="h"><s:property value="h"/></li>
                <li class="dataType"><s:property value="dataType"/></li>
                <li class="placeId"><s:property value="placeId"/></li>
                <li class="transId"><s:property value="transId"/></li>
                <li class="type"><s:property value="type"/></li>
                <li class="initmark"><s:property value="initmark"/></li>
                <li class="transNextId"><s:property value="transNextId"/></li>
                <li class="placeNextId"><s:property value="placeNextId"/></li>
            </ul>
            </s:iterator>
              
    </s:iterator>
  </div>
 
<script type="text/javascript">
var c=document.getElementById("myCanvas");
var cxt=c.getContext("2d");
 
function DrawTrans(cxt,x,y,a,b){
    //var cT=document.getElementById("myCanvas");
    //var cxtT=cT.getContext("2d");
    cxt.save();
    cxt.beginPath();
    cxt.strokeStyle = "#0000FF";
    cxt.strokeRect(x,y,a,b);
    cxt.restore();
}
function DrawPlace(context, x, y, a, b)
{
   //max是等于1除以长轴值a和b中的较大者
   //i每次循环增加1/max，表示度数的增加
   //这样可以使得每次循环所绘制的路径（弧线）接近1像素
   var step = (a > b) ? 1 / a : 1 / b;
   context.beginPath();
   context.strokeStyle = "#0000FF";
   context.moveTo(x + a, y); //从椭圆的左端点开始绘制
   for (var i = 0; i < 2 * Math.PI; i += step)
   {
      //参数方程为x = a * cos(i), y = b * sin(i)，
      //参数为i，表示度数（弧度）
      context.lineTo(x + a * Math.cos(i), y + b * Math.sin(i));
   }
   //context.closePath();
   context.stroke();
}
function DrawArc(cont, ax,ay,bx,by){
     
}
 
//DrawPlace(40, 40);
//DrawTrans(30,80);
 
</script>
 
 
   
  </body>
</html>

画图显示的时候就是不对，直接调用画图函数的时候，是对的，但是加到for循环中就出现绘制偏差，不知道怎么回事啊。。

下面是页面源码：

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<!DOCTYPE html>
<html>
  <head>
    <base href="http://localhost:8080/parsecpn/">
     
    <title>My JSP 'index.jsp' starting page</title>
    <script type="text/javascript" src="http://localhost:8080/parsecpn/js/jquery-1.9.0.js"></script>
    <script type="text/javascript" src="http://localhost:8080/parsecpn/js/my.js"></script>
<script type="text/javascript">
$(document).ready(function(){
    //var ll = "3.cpn";
    //alert(urll);
    var transLength = $(".trans").length;
    var arcLength = $(".arc").length;
    var placeLength = $(".place").length;
    var xP = new Array(placeLength);
    var yP = new Array(placeLength);
    var wP = new Array(placeLength);
    var hP = new Array(placeLength);
     
    var xT = new Array(transLength);
    var yT = new Array(transLength);
    var wT = new Array(transLength);
    var hT = new Array(transLength);
    for(var i=0; i<placeLength; i++){
        xP[i] = $(".place:eq("+i+")").find(".x").text();
        yP[i] = $(".place:eq("+i+")").find(".y").text();
        wP[i] = $(".place:eq("+i+")").find(".w").text();
        hP[i] = $(".place:eq("+i+")").find(".h").text();
    }
    for(var i=0; i<transLength; i++){
        xT[i] = $(".place:eq("+i+")").find(".x").text();
        yT[i] = $(".place:eq("+i+")").find(".y").text();
        wT[i] = $(".place:eq("+i+")").find(".w").text();
        hT[i] = $(".place:eq("+i+")").find(".h").text();
    }
     
    //第一步，获得所有的元素个数
 
    $("#showModel").click(function(){
        DrawTrans(cxt,0,0,50,50);
        //DrawPlace(cxt,200.0,200.0,60.0,40.0);
        for(var j=0; j<placeLength; j++){
            //alert(xP[j]+" "+yP[j]+" "+wP[j]+" "+hP[j]);
            DrawPlace(cxt,xP[j],yP[j],wP[j],hP[j]);
        }
         
        for(var i=0; i<transLength; i++){
             
            DrawTrans(cxt,xT[i],yT[i],wT[i],hT[i]);
        }
        for(var i=0; i<transLength; i++){
             
            DrawTrans(cxt,xT[i],yT[i],wT[i],hT[i]);
        }
        //画箭头
        var a1=new window.mapleque.arrow();
        a1.set({x:350,y:300},{x:200,y:200});
        a1.paint(cxt);
         
    });
     
     
});
</script>
  </head>
  <body>
<input type="button" id="showModel" value="生成模型"/>
<br/>
<!-- 
<table>
    <tr>
        <td>
            <canvas id="myCanvas" width="800" height="500" style="border:1px solid #c3c3c3;">
                Your browser does not support the canvas element.
            </canvas>
        </td>
        <td>
            <canvas id="newCanvas" width="800" height="500" style="border:1px solid #c3c3c3;">
                Your browser does not support the canvas element.
            </canvas>
        </td>
    </tr>
</table>
-->
            <canvas id="myCanvas" width="800" height="500" style="border:1px solid #c3c3c3;">
                Your browser does not support the canvas element.
            </canvas>
<hr/>
<table id="table"></table>
<div  id="div" >
           
             
               
                <ul class="trans"> trans
                <li class="id">1419094240</li>
                <li class="text">int</li>
                <li class="x">326.0</li>
                <li class="y">200.0</li>
                <li class="w">60.0</li>
                <li class="h">40.0</li>
                <li class="dataType"></li>
                <li class="placeId"></li>
                <li class="transId"></li>
                <li class="type"></li>
                <li class="initmark"></li>
                <li class="transNextId">0, 1419094300, 0, 0</li>
                <li class="placeNextId"></li>
            </ul>
               
                <ul class="trans"> trans
                <li class="id">1419094720</li>
                <li class="text">c</li>
                <li class="x">494.0</li>
                <li class="y">301.0</li>
                <li class="w">60.0</li>
                <li class="h">40.0</li>
                <li class="dataType"></li>
                <li class="placeId"></li>
                <li class="transId"></li>
                <li class="type"></li>
                <li class="initmark"></li>
                <li class="transNextId">0, 0, 0, 1419094819</li>
                <li class="placeNextId"></li>
            </ul>
              
              
       
             
               
                <ul class="arc"> arc
                <li class="id">1419094280</li>
                <li class="text"></li>
                <li class="x"></li>
                <li class="y"></li>
                <li class="w"></li>
                <li class="h"></li>
                <li class="dataType">i</li>
                <li class="placeId">1419094226</li>
                <li class="transId">1419094240</li>
                <li class="type"></li>
                <li class="initmark"></li>
                <li class="transNextId"></li>
                <li class="placeNextId"></li>
            </ul>
               
                <ul class="arc"> arc
                <li class="id">1419094300</li>
                <li class="text"></li>
                <li class="x"></li>
                <li class="y"></li>
                <li class="w"></li>
                <li class="h"></li>
                <li class="dataType">i</li>
                <li class="placeId">1419094260</li>
                <li class="transId">1419094240</li>
                <li class="type"></li>
                <li class="initmark"></li>
                <li class="transNextId"></li>
                <li class="placeNextId"></li>
            </ul>
               
                <ul class="arc"> arc
                <li class="id">1419094735</li>
                <li class="text"></li>
                <li class="x"></li>
                <li class="y"></li>
                <li class="w"></li>
                <li class="h"></li>
                <li class="dataType">i</li>
                <li class="placeId">1419094260</li>
                <li class="transId">1419094720</li>
                <li class="type"></li>
                <li class="initmark"></li>
                <li class="transNextId"></li>
                <li class="placeNextId"></li>
            </ul>
               
                <ul class="arc"> arc
                <li class="id">1419094819</li>
                <li class="text"></li>
                <li class="x"></li>
                <li class="y"></li>
                <li class="w"></li>
                <li class="h"></li>
                <li class="dataType">i</li>
                <li class="placeId">1419094226</li>
                <li class="transId">1419094720</li>
                <li class="type"></li>
                <li class="initmark"></li>
                <li class="transNextId"></li>
                <li class="placeNextId"></li>
            </ul>
              
              
       
             
               
                <ul class="place"> place
                <li class="id">1419094226</li>
                <li class="text">a</li>
                <li class="x">200.0</li>
                <li class="y">200.0</li>
                <li class="w">60.0</li>
                <li class="h">40.0</li>
                <li class="dataType"></li>
                <li class="placeId"></li>
                <li class="transId"></li>
                <li class="type">INT</li>
                <li class="initmark"></li>
                <li class="transNextId"></li>
                <li class="placeNextId">1419094280, 0, 0, 0</li>
            </ul>
               
                <ul class="place"> place
                <li class="id">1419094260</li>
                <li class="text">b</li>
                <li class="x">494.0</li>
                <li class="y">200.0</li>
                <li class="w">60.0</li>
                <li class="h">40.0</li>
                <li class="dataType"></li>
                <li class="placeId"></li>
                <li class="transId"></li>
                <li class="type">INT</li>
                <li class="initmark"></li>
                <li class="transNextId"></li>
                <li class="placeNextId">0, 0, 1419094735, 0</li>
            </ul>
              
              
      
  </div>
 
<script type="text/javascript">
var c=document.getElementById("myCanvas");
var cxt=c.getContext("2d");
 
function DrawTrans(cxt,x,y,a,b){
    //var cT=document.getElementById("myCanvas");
    //var cxtT=cT.getContext("2d");
    cxt.save();
    cxt.beginPath();
    cxt.strokeStyle = "#0000FF";
    cxt.strokeRect(x,y,a,b);
    cxt.restore();
}
function DrawPlace(context, x, y, a, b)
{
   //max是等于1除以长轴值a和b中的较大者
   //i每次循环增加1/max，表示度数的增加
   //这样可以使得每次循环所绘制的路径（弧线）接近1像素
   var step = (a > b) ? 1 / a : 1 / b;
   context.beginPath();
   context.strokeStyle = "#0000FF";
   context.moveTo(x + a, y); //从椭圆的左端点开始绘制
   for (var i = 0; i < 2 * Math.PI; i += step)
   {
      //参数方程为x = a * cos(i), y = b * sin(i)，
      //参数为i，表示度数（弧度）
      context.lineTo(x + a * Math.cos(i), y + b * Math.sin(i));
   }
   //context.closePath();
   context.stroke();
}
function DrawArc(cont, ax,ay,bx,by){
     
}
 
//DrawPlace(40, 40);
//DrawTrans(30,80);
 
</script>
 
 
   
  </body>
</html>

可以直接复制到jsp页面中直接使用那。
生成的图是这个样子，很明显两个矩形的框位置就不对！


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