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html5绘图

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12/01
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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";
//var urll = "http://localhost:8080/parsecpn/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]);
}
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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