-- 作者：pertoleum
-- 发布时间：5/18/2005 10:12:00 PM
-- [求助]用dom4j来实现画饼图
我现在正在做一个关于用dom4j来生成xml文件的东西，关于如何把javascript的
<script>
<![CDATA
……
]]>
</script>块中的内容写进文件中，不知道用哪个函数？我全部用了addCDATA()这个函数。程序运行没有问题，可以生成.svg的文件，但是生成的文件却无法打开。
代码如下，望各位给指导一下。 package dom4j; import java.io.File;
import java.io.FileWriter;
import java.util.Iterator;
import java.util.List; import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter; public class Pie { public static int createXMLFile(String filename){
int returnvalue = 0; Document document = DocumentHelper.createDocument(); Element svg=document.addElement("svg");
svg.addAttribute("width","100%" );
svg.addAttribute("height","100%");
svg.addAttribute("onload","init(event)"); Element script=svg.addElement("script");
script.addAttribute("type","text/javascript");
script.addCDATA("var width = 800.;");
script.addCDATA("var height = 500.;");
script.addCDATA("var basePointX = 300.;");
script.addCDATA("var basePointY = 150.;");
script.addCDATA("var currentX = 0.0;");
script.addCDATA("var currentY = 0.0;");
script.addCDATA("var offsetX1 = 0.0;");
script.addCDATA("var offsetY1 = 0.0;");
script.addCDATA("var offsetX2 = 0.0;");
script.addCDATA("var offsetY2 = 0.0;");
script.addCDATA("var radius = 100.;");
script.addCDATA("var angleSum1 = 0.;");
script.addCDATA("var angleSum2 = 0.;");
script.addCDATA("var vertexCount = 8;");
script.addCDATA("var xPts = Array(vertexCount);");
script.addCDATA("var yPts = Array(vertexCount);");
script.addCDATA("var angles = Array(vertexCount);");
script.addCDATA("var pointPath = \"\";");
script.addCDATA("var circleColors = ['red','green','blue','yellow'];");
script.addCDATA("var colorCount = 4.;");
script.addCDATA("var pieNode = null;");
script.addCDATA("var svgDocument = null;");
script.addCDATA("var target = null;");
script.addCDATA("var gcNode = null;"); script.addCDATA("function init(event){");
script.addCDATA("target = event.getTarget();");
script.addCDATA("svgDocument = target.getOwnerDocument();");
script.addCDATA("gcNode = svgDocument.getElementById(\"gc\");");
script.addCDATA("initializeChart();");
script.addCDATA("drawChart();");
script.addCDATA("}"); script.addCDATA("function initializeChart(){");
script.addCDATA("angles[0] = 30.;");
script.addCDATA("angles[1] = 60.;");
script.addCDATA("angles[2] = 45.;");
script.addCDATA("angles[3] = 45.;");
script.addCDATA("angles[4] = 20.;");
script.addCDATA("angles[5] = 30.;");
script.addCDATA("angles[6] = 50.;");
script.addCDATA("angles[7] = 80.;");
script.addCDATA("}"); script.addCDATA("function drawChart(){"); script.addCDATA("for(var v=0;v<angles.length;v++){");
script.addCDATA("angleSum2 = angleSum1 + angles[v];");
script.addCDATA("offsetX1 = radius*Math.cos(angleSum1*Math.PI/180);");
script.addCDATA("offsetY1 = radius*Math.sin(angleSum1*Math.PI/180);");
script.addCDATA("offsetX2 = radius*Math.cos(angleSum2*Math.PI/180);");
script.addCDATA("offsetY2 = radius*Math.sin(angleSum2*Math.PI/180);");
script.addCDATA("currentX = basePointX+offsetX2;");
script.addCDATA("currentY = basePointY-offsetY2;");
//垂直方向坐标需要做减法,所以将offsetY1 取反
script.addCDATA("offsetY1 *= -1;");
script.addCDATA("pointPath = \"M\"+basePointX+\",\"+basePointY;");
script.addCDATA("pointPath += \" l\"+offsetX1+\",\"+offsetY1;");
script.addCDATA("pointPath += \" A\"+radius+\",\"+radius+\" 0 0 0 \";");
//圆是椭圆的特例,前后2个radius分别表示椭圆的长轴和短轴
//前一个0,表画出的圆弧的旋转角度为0,即不旋转; 0,0表示画劣弧,且按逆时针方向画
script.addCDATA("pointPath += currentX+\",\"+currentY;");
script.addCDATA("pointPath += \" L\"+basePointX+\",\"+basePointY+\"z\";"); script.addCDATA("var style = \"\";");
script.addCDATA("var strokeWidth = 1.;");
script.addCDATA("var strokeColor = 'white';");
script.addCDATA("stroke = \"stroke:\"+strokeColor+\";\";");
script.addCDATA("stroke += \"stroke-width:\"+strokeWidth+\";\";");
script.addCDATA("fillColor = \"fill:\"+circleColors[v%colorCount];");
script.addCDATA("style = stroke+fillColor;"); script.addCDATA("pieNode = svgDocument.createElement(\"path\");");
script.addCDATA("pieNode.setAttribute(\"d\", pointPath);");
script.addCDATA("pieNode.setAttribute(\"style\",style);"); script.addCDATA("gcNode.appendChild(pieNode);");
script.addCDATA("angleSum1 = angleSum2;");
script.addCDATA("}");
script.addCDATA("}"); Element g=svg.addElement("g");
g.addAttribute("id","gc");
g.addAttribute("transform","translate(10,10)");
Element rect=g.addElement("rect");
rect.addAttribute("x","0");
rect.addAttribute("y","0");
rect.addAttribute("width","800");
rect.addAttribute("height","500");
rect.addAttribute("fill","lightblue");
rect.addAttribute("stroke","red"); try{
/** 将document中的内容写入文件中 */
XMLWriter writer = new XMLWriter(new FileWriter(new File(filename)));
writer.write(document);
writer.close();
/** 执行成功,需返回1 */
returnvalue = 1;
}catch(Exception ex){
ex.printStackTrace();
} return returnvalue;
} public int formatXMLFile(String filename){
int returnvalue = 0;
try{
SAXReader saxReader = new SAXReader();
Document document = saxReader.read(new File(filename));
XMLWriter writer = null;
/** 格式化输出,类型IE浏览一样 */
OutputFormat format = OutputFormat.createPrettyPrint();
/** 指定XML编码 */
format.setEncoding("GBK");
writer= new XMLWriter(new FileWriter(new File(filename)),format);
writer.write(document);
writer.close();
/** 执行成功,需返回1 */
returnvalue = 1;
}catch(Exception ex){
ex.printStackTrace();
}
return returnvalue;
}
public static void main(String[] args) {
Pie pie1 = new Pie();
System.out.println(pie1.createXMLFile("d://p.svg"));
System.out.println(pie1.formatXMLFile("d://p.svg"));
} }
|