drawarcdemo.java

一些java程序源代码,对初学java的同学非常有帮助,是入门的首选,值得学习下载

import javax.swing.*;
import java.awt.Graphics;
import java.awt.Color;
public class DrawArcDemo extends JFrame {
  public DrawArcDemo()  {
    super("绘制圆弧");
    this.getContentPane().add(new ArcPanel());
    setSize(300,300);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  }
  public static void main(String[] args) {
    DrawArcDemo frame = new DrawArcDemo();
    frame.show();
  }
}
class ArcPanel extends JPanel{
  public void paintComponent(Graphics g) {
    int arcArray[]={30,45,60,90,135};//圆弧的角度
    int start=0;//用于计算圆弧的起始角
    Color colorArray[]={Color.green,Color.red,Color.blue,Color.yellow,Color.orange};
    //绘制正方形外框
    g.drawRect(getSize().width/2-100,getSize().height/2-100,200,200);
    for(int i=0;i<arcArray.length;i++){
      g.setColor(colorArray[i]);//设置填充颜色
      g.fillArc(getSize().width/2-100,getSize().height/2-100,200,200,
                start,arcArray[i]);
      start+=arcArray[i];//计算新的起始角
    }
  }
}