Java饼状图.docx

packageImageHandle;

importjava.awt.BorderLayout;
importjava.awt.Color;
importjava.awt.Graphics;
importjava.awt.GridLayout;

importjavax.swing.JFrame;
importjavax.swing.JLabel;
importjavax.swing.JPanel;

publicclassPiePicture{

/**
*@paramargs
*/
publicstaticvoidmain(String[]args){
//TODOAuto-generatedmethodstub
DemoWindow1dw=newDemoWindow1("饼状图");
dw.setBounds(dw.getToolkit().getScreenSize().width/3,dw.getToolkit()
.getScreenSize().height/3,
dw.getToolkit().getScreenSize().width/3,dw.getToolkit()
.getScreenSize().height/3);
dw.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
dw.setVisible(true);
}

}

classDemoWindow1extendsJFrame{
//绘制饼状图面板
DrawPanel1dp=newDrawPanel1();

double[]numbers={0.3,0.4,0.2,0.3,0.1};

ColorPanel1cp=null;

publicDemoWindow1(Stringtitle){
super(title);
dp.setNumbers(numbers);
//创建显示对应饼状图颜色信息的面板
cp=newColorPanel1(dp);
add(dp,BorderLayout.CENTER);
add(cp,BorderLayout.EAST);
}
}

//绘制饼状图的面板类
classDrawPanel1extendsJPanel{
double[]numbers=null;
//对应饼状图的颜色数组
Color[]colors=null;

publicvoidpaintComponent(Graphicsg){
super.paintComponent(g);

doubletotal=0;
//计算数值数组的所有元素的总和
for(inti=0;i<numbers.length;i++){
total+=numbers[i];
}
//下一个扇形的起始角度
doubletotalAngle=0;
//起始角度
intstartAngle=0;
for(inti=0;i<numbers.length;i++){
startAngle=(int)(totalAngle*360/total);
//获取要绘制的角度
intarcAngle=(int)(numbers[i]*360/total);
//绘制扇形
g.setColor(colors[i]);
g.fillArc(getWidth()/6,getHeight()/6,getWidth()*2/3,
getHeight()*2/3,startAngle,arcAngle);
//累加角度的汇总数值，得到下一个绘制扇形的起始角度
totalAngle+=numbers[i];
}
}

publicdouble[]getNumbers(){
returnnumbers;
}

publicvoidsetNumbers(double[]numbers){
this.numbers=numbers;
//生成随机颜色数组
colors=newColor[numbers.length];
for(inti=0;i<colors.length;i++){
colors[i]=newColor((int)(Math.random()*256),
(int)(Math.random()*256),(int)(Math.random()*256));
}
}

publicColor[]getColors(){
returncolors;
}
}

classColorP