java生成饼图svg

package com.tellhow.svg;

import java.io.File;import java.io.FileOutputStream;

/*** * @author 风絮NO.1**/public class CakySvgWithLabel {//定义不同的颜色static String[] colors ={"#f2e692", "#aa1111", "#799AE1", "#3e941b", "#66cc00", "#297110", "#d6a97b", "#82522b", "#aaaaff", "#1111aa", "#ff2222", "#ffaaaa"};static String initialize(double [] percents,String[]names){StringBuffer sfile = new StringBuffer();sfile.append("<?xml version='1.0' encoding='UTF-8'?>");sfile.append("/n");sfile.append("<svg xmlns:svg='http://www.w3.org/2000/svg'");sfile.append("/n"); sfile.append("xmlns='http://www.w3.org/2000/svg'"); sfile.append("/n"); sfile.append("xmlns:xlink='http://www.w3.org/1999/xlink'"); sfile.append("/n"); sfile.append("xml:space='default'"); sfile.append("/n"); sfile.append("version='1.1' width='100%' height='100%' viewBox='0 0 2024 570'>"); sfile.append("/n"); sfile.append("<defs></defs>"); sfile.append("/n"); sfile.append("<g stroke-width='1' stroke='#FFFFFF' transform='matrix(1,0,0,1,16.384,-9.83)' xmlns='http://www.w3.org/2000/svg'>"); sfile.append("/n"); //循环创造path标签. String path =creatPath(502, 300, 300, percents,names);//中心点式503,300. sfile.append(path); sfile.append("</g>"); sfile.append("/n"); sfile.append("</svg>");return sfile.toString();}/** * * @param x0 中心点横坐标 * @param y0 中心点纵坐标 * @param r 半径 * @param percents 百分比数组 * @param names 显示颜色代表的名称 * @return */ public static String creatPath(double x0,double y0,double r,double[]percents,String[]names){ StringBuffer sfile =new StringBuffer(); double x1=0; //新扇形的x坐标 double y1=0; //新扇形的y坐标 double middleX=0; //文本显示的坐标,包括竖线显示的坐标 double middleY=0; double radian =0; //弧度 double textRadian=0; //文本显示位置度弧度 double k=0; int N=10; for(int i=0;i<percents.length;i++){ if(i==0){ radian =getRadian(percents[0]); textRadian=radian/2; x1 = (x0+getCos(radian)*r); y1 = (y0-getSin(radian)*r); middleX=(x0+getCos(textRadian)*r); middleY=(y0-getSin(textRadian)*r); double percent = Math.round(percents[0]*100)/100.0;//获得精确到两位小数点的坐标. k=Math.abs((middleY-y0)/(middleX-x0));//获得扇形终点的坐标,与中心点连成的直线的斜率.(取正值) double sita= Math.atan(k);//求斜角 double lineLen=50; double textLen=70; if(radian<6){ lineLen=90; textLen=110;//控制指示线的长度,与文字的位置 } if(percents[i]!=0){//当一个类型为0时，饼图展示 if((textRadian<(Math.PI/2))){ sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX+Math.cos(sita)*lineLen)+"' y2='"+(middleY-(Math.sin(sita)*lineLen))+"' stroke='#000000'/>"); sfile.append("/n"); sfile.append("<text x='"+(middleX+Math.cos(sita)*textLen)+"' y='"+(middleY-(Math.sin(sita)*textLen))+"' space='PReserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>"); }else if ((textRadian>(Math.PI/2)&&textRadian<Math.PI)){ sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX-Math.cos(sita)*lineLen)+"' y2='"+(middleY-(Math.sin(sita)*lineLen))+"' stroke='#000000'/>"); sfile.append("/n"); sfile.append("<text x='"+(middleX-Math.cos(sita)*textLen)+"' y='"+(middleY-(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>"); }else if ((textRadian>(Math.PI)&&textRadian<(Math.PI*3/2))){ sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX-Math.cos(sita)*lineLen)+"' y2='"+(middleY+(Math.sin(sita)*lineLen))+"' stroke='#000000'/>"); sfile.append("/n"); sfile.append("<text x='"+(middleX-Math.cos(sita)*textLen)+"' y='"+(middleY+(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>"); }else if((textRadian>(Math.PI*3/2)&&textRadian<(Math.PI*2))){ sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX+Math.cos(sita)*lineLen)+"' y2='"+(middleY+Math.sin(sita)*lineLen)+"' stroke='#000000'/>"); sfile.append("/n"); sfile.append("<text x='"+(middleX+Math.cos(sita)*textLen)+"' y='"+(middleY+(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>"); } sfile.append("/n"); if(getRadian(percents[0])>Math.PI){ sfile.append("<path d='M "+x0+" "+y0+" L "+(x0+r)+" "+r+" A "+r+" "+r+" 0 1 0 "+x1+" "+y1+" L "+x0+" "+y0+" z' fill='"+colors[0]+"'/>"); }else{ sfile.append("<path d='M "+x0+" "+y0+" L "+(x0+r)+" "+r+" A "+r+" "+r+" 0 0 0 "+x1+" "+y1+" L "+x0+" "+y0+" z' fill='"+colors[0]+"'/>"); } sfile.append("/n"); } sfile.append("<rect x='"+(x0+2*r)+"' y='"+(y0-r/2.0+N)+"' width='60' height='30' fill='"+colors[i]+"' stroke='#FFFFFF' stroke-dasharray='1,1' />"); sfile.append("/n"); sfile.append("<text x='"+(x0+2*r+80)+"' y='"+(y0-r/2.0+N+25)+"' space='preserve' font-family='宋体' font-size='28' fill='"+colors[0]+"' stroke='#000000' stroke-dasharray='1,1' baseline-shift='baseline'>"+names[0]+"</text>"); sfile.append("/n"); }else{ textRadian = radian+(getRadian(percents[i])/2);//获取指示线与X轴的弧度. radian =radian+getRadian(percents[i]);//第i个扇形前面的弧度的总和 middleX=(x0+getCos(textRadian)*r); middleY=(y0-getSin(textRadian)*r); double percent = Math.round(percents[i]*100)/100.0; k=Math.abs((middleY-y0)/(middleX-x0)); double lineLen=50; double textLen=70; if(radian<6){ lineLen=90; textLen=110; } double sita= Math.atan(k); if(percents[i]!=0){//当一个类型为0时，饼图展示 if((textRadian<(Math.PI/2))){ sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX+Math.cos(sita)*lineLen)+"' y2='"+(middleY-(Math.sin(sita)*lineLen))+"' stroke='#000000'/>"); sfile.append("/n"); sfile.append("<text x='"+(middleX+Math.cos(sita)*textLen)+"' y='"+(middleY-(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>"); }else if ((textRadian>(Math.PI/2)&&textRadian<Math.PI)){ sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX-Math.cos(sita)*lineLen)+"' y2='"+(middleY-(Math.sin(sita)*lineLen))+"' stroke='#000000'/>"); sfile.append("/n"); sfile.append("<text x='"+(middleX-Math.cos(sita)*textLen)+"' y='"+(middleY-(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>"); }else if ((textRadian>(Math.PI)&&textRadian<(Math.PI*3/2))){ sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX-Math.cos(sita)*lineLen)+"' y2='"+(middleY+(Math.sin(sita)*lineLen))+"' stroke='#000000'/>"); sfile.append("/n"); sfile.append("<text x='"+(middleX-Math.cos(sita)*textLen)+"' y='"+(middleY+(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>"); }else if((textRadian>(Math.PI*3/2)&&textRadian<(Math.PI*2))){ sfile.append("<line x1='"+middleX+"' y1='"+middleY+"' x2='"+(middleX+Math.cos(sita)*lineLen)+"' y2='"+(middleY+Math.sin(sita)*lineLen)+"' stroke='#000000'/>"); sfile.append("/n"); sfile.append("<text x='"+(middleX+Math.cos(sita)*textLen)+"' y='"+(middleY+(Math.sin(sita)*textLen))+"' space='preserve' font-family='Tahoma' font-size='21' fill='red' stroke='red' baseline-shift='baseline' >"+percent+"%</text>"); } sfile.append("/n"); // 参数 1 表示 画大于180的弧, 0 表示画小于180的弧 (这个地方比较重要) if(getRadian(percents[i])>Math.PI){ sfile.append("<path d='M "+x0+" "+y0+" L "+x1+" "+y1+" A "+r+" "+r+" 0 1 0 "+(x1=x0+getCos(radian)*r)+" "+(y1=y0-getSin(radian)*r)+" L "+x0+" "+y0+" z' fill='"+colors[i]+"'/>"); }else{ sfile.append("<path d='M "+x0+" "+y0+" L "+x1+" "+y1+" A "+r+" "+r+" 0 0 0 "+(x1=x0+getCos(radian)*r)+" "+(y1=y0-getSin(radian)*r)+" L "+x0+" "+y0+" z' fill='"+colors[i]+"'/>"); } sfile.append("/n"); } N+=50; sfile.append("<rect x='"+(x0+2*r)+"' y='"+(y0-r/2.0+N)+"' width='60' height='30' fill='"+colors[i]+"' stroke='#FFFFFF' stroke-dasharray='1,1' />"); sfile.append("/n"); sfile.append("<text x='"+(x0+2*r+80)+"' y='"+(y0-r/2.0+N+25)+"' space='preserve' font-family='宋体' font-size='28' fill='"+colors[0]+"' stroke='#000000' stroke-dasharray='1,1' baseline-shift='baseline'>"+names[i]+"</text>"); sfile.append("/n"); } } return sfile.toString(); } //返回弧度 public static double getRadian(double fenshu){ return (fenshu*Math.PI)/50; } //返回正弦public static double getSin(double radian){ return Math.sin(radian);}//返回余弦public static double getCos(double radian){return Math.cos(radian);}public static void main(String[] args) {int[] data= {3,64,0,284,10};String[] names={"主变:"+data[0]+"个","断路器:"+data[1]+"个","线路:"+data[2]+"个","刀闸:"+data[3]+"个","母线:"+data[4]+"个"};create(data,names);}private static void create(int[] data,String[] names) { try {createSVG("d:/a.svg",getPercent(data),names);} catch (Exception e) {e.printStackTrace();}}private static double[] getPercent(int data[]){double sum=0;double percents[] = new double[data.length];for(int i=0;i<data.length;i++){sum+=data[i];}for(int i=0;i<data.length;i++){percents[i] =(data[i]/sum)*100;}return percents;}public static void createSVG(String fileRealPath, double[] percents,String[] names) throws Exception {String sFile = initialize(percents,names);try {byte[] byteFil = sFile.getBytes("UTF-8");File svgFile = new File(fileRealPath);if (svgFile.exists()) {svgFile.delete();}FileOutputStream fos = new FileOutputStream(svgFile);fos.write(byteFil);fos.close();} catch (Exception ex) {System.out.print(ex.getMessage());}}}