java生成饼图svg及JFreeChart生成svg图表
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2024-03-05 14:39:24
jfreechart本身不能生成svg图形,但是可以借助另外一个东西,辅助生成.好像是这个:batik ，具体代码请看下文
一：java生成svg饼图,附带了一个标签显示...
jfreechart本身不能生成svg图形,但是可以借助另外一个东西,辅助生成.好像是这个:batik ，具体代码请看下文
一：java生成svg饼图,附带了一个标签显示各个颜色代表的部分
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());
}
}
}
二.java生成svg 3d饼图.
(这个可以生成图形,但是不完善,我没有再修改代码啦,因为觉得这个东西不值,用jfreechart可能更好.功能更强到,只是这几个程序,让我更加了解了svg这个东西,里面的一些标签都干什么用的.等等.) 3d的这个,生成的效果图,会有断层的效果,主要是出现在第一现象和第四象限,即如果第一象限或第四象限,有两个扇形的话,就会出现断层,可以用这个工具进行调整:svgdeveloper. 用它打开svg图形,然后将断层的扇形的代码,重新倒序排列一下.
package com.xj.svg;
import java.io.file;
import java.io.fileoutputstream;
public class caky3dsvg {
static string[] colors ={"#d6a97b",
"#22ff22", "#aaffaa", "#799ae1",
"#9aabee", "#3e941b", "#f2e692",
"#66cc00", "#297110", "#d6a97b",
"#82522b", "#aaaaff", "#1111aa",
"#ff2222", "#ffaaaa", "#aa1111"
};
public static void main(string[] args) {
double data[] = {20,20,50};
try {
createsvg("f:/f.svg",getpercent(data));
} catch (exception e) {
e.printstacktrace();
}
}
static string initialize(double [] percent){
double percents[] = {10,15,5,20,40,10};
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 1024 600'>");
sfile.append("\n");
sfile.append("<defs></defs>");
sfile.append("\n");
string path = createpath(502, 300,300, 150, percents);
sfile.append(path);
sfile.append("</g>");
sfile.append("\n");
sfile.append("</svg>");
return sfile.tostring();
}
/**
*
* @param x0 原点 x
* @param y0 原点 y
* @param langr
* @param shortr
* @param fenshu
* @return
*/
static string createpath(double x0,double y0,double langr,double shortr ,double percents[]){
stringbuffer sfile = new stringbuffer();
double xbottom =0;
double ybottom =0;
double xbottom1=0;
double ybottom1=0;
double radian =0;
sfile.append("<g stroke-width='1' stroke='#000000' transform='matrix(1,0,0,1,1.638,-9.83)' xmlns='http://www.w3.org/2000/svg'>");
sfile.append("\n");
for(int i=0;i<percents.length;i++){
system.out.println("i:"+i);
radian =radian+getradian(percents[i]);//第i个扇形到 第一个扇形,弧度的总和.
system.out.println("弧度2:"+radian);
if (i==0){
system.out.println("弧度1:"+radian);
if(radian==math.pi/2){
xbottom = x0;//底面的x坐标
ybottom = y0-shortr;//底面的y坐标
}else if(radian==math.pi*3/2){
xbottom = x0;//底面的x坐标
ybottom = y0+shortr;//底面的y坐标
} else{
double tanradian = math.abs(math.tan(radian));
double sqvalue=shortr*shortr+tanradian*tanradian*langr*langr;
if(radian<math.pi/2){
system.out.println("if1:"+radian);
xbottom = x0+(langr*shortr)/math.sqrt(sqvalue);//底面的x坐标
ybottom = y0-(tanradian*langr*shortr)/math.sqrt(sqvalue);//底面的y坐标
}
else if (radian>math.pi/2&&radian<=math.pi){
system.out.println("if2:"+radian);
xbottom =x0-(langr*shortr)/math.sqrt(sqvalue);
ybottom =y0-(tanradian*langr*shortr)/math.sqrt(sqvalue);
}else if (radian>math.pi&&radian<math.pi*3/2){
system.out.println("if3:"+radian);
xbottom =x0-(langr*shortr)/math.sqrt(sqvalue);
ybottom =y0+(tanradian*langr*shortr)/math.sqrt(sqvalue);
}else if (radian>math.pi*3/2&&radian<math.pi*2){
system.out.println("if4:"+radian);
xbottom = x0+(langr*shortr)/math.sqrt(sqvalue);
ybottom = y0+(tanradian*langr*shortr)/math.sqrt(sqvalue);
}
}
if(getradian(percents[0])>math.pi){//大于 pi 弧度,即百分比超过50%
sfile.append("<g fill='"+colors[i]+"' >");
sfile.append("\n");
sfile.append("<path d='m "+x0+" "+y0+" l "+(x0+langr)+" "+y0+" a "+langr+" "+shortr+" 0 1 0 "+xbottom+" "+ybottom+" z' />");
sfile.append("\n");
sfile.append("<path d='m "+(x0+langr)+" "+(y0-50)+" a "+langr+" "+shortr+" 0 1 0 "+xbottom+" "+(ybottom-50)+" l "+xbottom+" "+ybottom+" a "+langr+" "+shortr+" 0 1 1 "+(x0+langr)+" "+y0+" z' />");
sfile.append("\n");
sfile.append("<path d='m "+x0+" "+(y0-50)+" l "+(x0+langr)+" "+(y0-50)+" a "+langr+" "+shortr+" 0 1 0 "+xbottom+" "+(ybottom-50)+" z' />");
sfile.append("\n");
sfile.append("</g>");
sfile.append("\n");
}else{
sfile.append("<g fill='"+colors[i]+"' >");
sfile.append("\n");
sfile.append("<path d='m "+x0+" "+y0+" l "+(x0+langr)+" "+y0+" a "+langr+" "+shortr+" 0 0 0 "+xbottom+" "+ybottom+" z' />");
sfile.append("\n");
sfile.append("<path d='m "+(x0+langr)+" "+(y0-50)+" a "+langr+" "+shortr+" 0 0 0 "+xbottom+" "+(ybottom-50)+" l "+xbottom+" "+ybottom+" a "+langr+" "+shortr+" 0 0 1 "+(x0+langr)+" "+y0+" z' />");
sfile.append("\n");
sfile.append("<path d='m "+x0+" "+(y0-50)+" l "+(x0+langr)+" "+(y0-50)+" a "+langr+" "+shortr+" 0 0 0 "+xbottom+" "+(ybottom-50)+" z' />");
sfile.append("\n");
sfile.append("</g>");
sfile.append("\n");
}
}else{
if(radian==math.pi/2){
xbottom1= x0;//底面的x坐标
ybottom1= y0-shortr;//底面的y坐标
}else if(radian==math.pi*3/2){
xbottom1 = x0;//底面的x坐标
ybottom1 = y0+shortr;//底面的y坐标
} else{
double tanradian = math.abs(math.tan(radian));
double sqvalue=shortr*shortr+tanradian*tanradian*langr*langr;
if(radian<math.pi/2){
system.out.println("if1:"+radian);
xbottom1 = x0+(langr*shortr)/math.sqrt(sqvalue);//底面的x坐标
ybottom1 = y0-(tanradian*langr*shortr)/math.sqrt(sqvalue);//底面的y坐标
}
else if (radian>math.pi/2&&radian<=math.pi){
system.out.println("if2:"+radian);
xbottom1 =x0-(langr*shortr)/math.sqrt(sqvalue);
ybottom1 =y0-(tanradian*langr*shortr)/math.sqrt(sqvalue);
}else if (radian>math.pi&&radian<math.pi*3/2){
system.out.println("if3:"+radian);
xbottom1 =x0-(langr*shortr)/math.sqrt(sqvalue);
ybottom1 =y0+(tanradian*langr*shortr)/math.sqrt(sqvalue);
}else if (radian>math.pi*3/2){
system.out.println("if4:"+radian);
xbottom1 = x0+(langr*shortr)/math.sqrt(sqvalue);
ybottom1 = y0+(tanradian*langr*shortr)/math.sqrt(sqvalue);
}
}
if(getradian(percents[i])>math.pi){//大于 pi 弧度,即百分比超过50%
system.out.println("大于pi");
sfile.append("<g fill='"+colors[i]+"' >");
sfile.append("\n");
sfile.append("<path d='m "+x0+" "+y0+" l "+xbottom+" "+ybottom+" a "+langr+" "+shortr+" 0 1 0 "+xbottom1+" "+ybottom1+" z' />");
sfile.append("\n");
sfile.append("<path d='m "+(xbottom)+" "+(ybottom-50)+" a "+langr+" "+shortr+" 0 1 0 "+xbottom1+" "+(ybottom1-50)+" l "+xbottom1+" "+ybottom1+" a "+langr+" "+shortr+" 0 1 1 "+xbottom+" "+ybottom+" z' />");
sfile.append("\n");
sfile.append("<path d='m "+x0+" "+(y0-50)+" l "+(xbottom)+" "+(ybottom-50)+" a "+langr+" "+shortr+" 0 1 0 "+xbottom1+" "+(ybottom1-50)+" z' />");
sfile.append("\n");
sfile.append("</g>");
sfile.append("\n");
}else{
system.out.println("小于pi");
sfile.append("<g fill='"+colors[i]+"' >");
sfile.append("\n");
sfile.append("<path d='m "+x0+" "+y0+" l "+xbottom+" "+ybottom+" a "+langr+" "+shortr+" 0 0 0 "+xbottom1+" "+ybottom1+" z' />");
sfile.append("\n");
sfile.append("<path d='m "+(xbottom)+" "+(ybottom-50)+" a "+langr+" "+shortr+" 0 0 0 "+xbottom1+" "+(ybottom1-50)+" l "+xbottom1+" "+ybottom1+" a "+langr+" "+shortr+" 0 0 1 "+xbottom+" "+ybottom+" z' />");
sfile.append("\n");
sfile.append("<path d='m "+x0+" "+(y0-50)+" l "+(xbottom)+" "+(ybottom-50)+" a "+langr+" "+shortr+" 0 0 0 "+xbottom1+" "+(ybottom1-50)+" z' />");
sfile.append("\n");
sfile.append("</g>");
sfile.append("\n");
}
xbottom=xbottom1;
ybottom=ybottom1;
}
}
return sfile.tostring();
}
//返回弧度
public static double getradian(double percent){
return (percent*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);
}
private static double[] getpercent(double 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) throws exception {
string sfile = initialize(percents);
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());
}
}
}
三.使用jfreechart动态生成svg图形:
import java.awt.rectangle;
import java.io.*;
import org.jfree.chart.*;
import org.apache.batik.dom.genericdomimplementation;
import org.apache.batik.svggen.svggraphics2d;
import org.jfree.data.category.categorydataset;
import org.jfree.data.category.defaultcategorydataset;
import org.jfree.chart.plot.*;
import org.w3c.dom.domimplementation;
import org.w3c.dom.document;
/**
* 该类用于演示最简单的柱状图生成
*/
public class barchartdemo {
public static void main(string[] args) throws ioexception {
categorydataset dataset = getdataset();
// 创建jfreechart对象，在内存中间创建出对应的图像
jfreechart chart = chartfactory.createbarchart3d("水果产量图", // 图表标题
"水果", // 目录轴的显示标签
"产量", // 数值轴的显示标签
dataset, // 数据集
plotorientation.vertical, // 图表方向：水平、垂直
true, // 是否显示图例(对于简单的柱状图必须是false)
false, // 是否生成工具
false // 是否生成url链接
);
file fo_svg = new file("d:\\fruit3.svg");
rectangle bounds = new rectangle(0,0,400,300);
exportchartassvg(chart,bounds,fo_svg);
}
private static void exportchartasjpg() throws filenotfoundexception, ioexception {
// 得到数据dataset
categorydataset dataset = getdataset();
// 创建jfreechart对象，在内存中间创建出对应的图像
jfreechart chart = chartfactory.createbarchart3d("水果产量图", // 图表标题
"水果", // 目录轴的显示标签
"产量", // 数值轴的显示标签
dataset, // 数据集
plotorientation.vertical, // 图表方向：水平、垂直
true, // 是否显示图例(对于简单的柱状图必须是false)
false, // 是否生成工具
false // 是否生成url链接
);
fileoutputstream fos_jpg = null;
try {
fos_jpg = new fileoutputstream("d:/fruit3.jpg");
chartutilities.writechartasjpeg(fos_jpg, 1, chart, 400, 300, null);
} finally {
try {
fos_jpg.close();
} catch (exception e) {
}
}
}
/**
* 获取一个演示用的简单数据集对象
*
* @return
*/
private static categorydataset getdataset() {
defaultcategorydataset dataset = new defaultcategorydataset();
dataset.addvalue(100, "1", "葡萄");
dataset.addvalue(200, "1", "梨子");
dataset.addvalue(200, "1", "荔枝");
dataset.addvalue(300, "2", "葡萄");
dataset.addvalue(400, "2", "梨子");
dataset.addvalue(500, "2", "荔枝");
return dataset;
}
/**
* 获取一个演示用的组合数据集对象
*
* @return
*/
private static categorydataset getdataset2() {
defaultcategorydataset dataset = new defaultcategorydataset();
dataset.addvalue(100, "北京", "苹果");
dataset.addvalue(100, "上海", "苹果");
dataset.addvalue(100, "广州", "苹果");
dataset.addvalue(200, "北京", "梨子");
dataset.addvalue(200, "上海", "梨子");
dataset.addvalue(200, "广州", "梨子");
dataset.addvalue(300, "北京", "葡萄");
dataset.addvalue(300, "上海", "葡萄");
dataset.addvalue(300, "广州", "葡萄");
dataset.addvalue(400, "北京", "香蕉");
dataset.addvalue(400, "上海", "香蕉");
dataset.addvalue(400, "广州", "香蕉");
dataset.addvalue(500, "北京", "荔枝");
dataset.addvalue(500, "上海", "荔枝");
dataset.addvalue(500, "广州", "荔枝");
return dataset;
}
/**
* exports a jfreechart to a svg file.
*
* @param chart jfreechart to export
* @param bounds the dimensions of the viewport
* @param svgfile the output file.
* @throws ioexception if writing the svgfile fails.
*/
private static void exportchartassvg(jfreechart chart, rectangle bounds, file svgfile) throws ioexception {
// get a domimplementation and create an xml document
domimplementation domimpl =
genericdomimplementation.getdomimplementation();
document document = domimpl.createdocument(null, "svg", null);
// create an instance of the svg generator
svggraphics2d svggenerator = new svggraphics2d(document);
// draw the chart in the svg generator
chart.draw(svggenerator, bounds);
// write svg file
outputstream outputstream = new fileoutputstream(svgfile);
writer out = new outputstreamwriter(outputstream, "utf-8");
svggenerator.stream(out, true /* use css */);
outputstream.flush();
outputstream.close();
}
}
用这个的时候需要注意两点:
1 .jfreechart本身不能生成svg图形,需要用到batik .一个java工具包,apache的.
batik-awt-util.jar
batik-dom.jar
batik-svggen.jar
batik-util.jar
batik-xml.jar
jfreechart-1.0.0.jar
2.就是可能生成svg,当你查看的时候不支持中文. 我记得好像是如果是安装的adobe的那个查看器,在ie里面浏览的话好像是中文乱码,如果用另外一个叫做 renesis svg player ,这个查看器就是支持中文的.
以上内容就是java生成饼图svg及jfreechart生成svg图表的全部内容，希望大家喜欢。
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