html5绘图
2024-08-29 18:51:49
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> <title>My JSP 'index.jsp' starting page</title><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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