按下按钮圆圈可以改变颜色

来源：互联网发布：淘宝客服图片素材编辑：程序博客网时间：2024/06/05 13:22

import javax.swing.*;import java.awt.*;public class MyDrawPanel extends JPanel{public void paintComponent(Graphics g){Graphics2D g2d=(Graphics2D)g;int red=(int)(Math.random()*255);int blue=(int)(Math.random()*255);int green=(int)(Math.random()*255);Color startColor=new Color(red,green,blue);red=(int)(Math.random()*255);blue=(int)(Math.random()*255);green=(int)(Math.random()*255);Color endColor=new Color(red,green,blue);GradientPaint gradient=new GradientPaint(70,70,startColor,100,100,endColor);g2d.setPaint(gradient);g2d.fillOval(70,70,100,100);}}

import javax.swing.*;import java.awt.*;import java.awt.event.*;public class SimpleGui3C implements ActionListener{JFrame frame;public static void main(String [] args){SimpleGui3C gui=new SimpleGui3C();gui.go();}public void go(){frame =new JFrame();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);JButton button=new JButton("Change colors");button.addActionListener(this);MyDrawPanel drawPanel=new MyDrawPanel();frame.getContentPane().add(BorderLayout.SOUTH,button);frame.getContentPane().add(BorderLayout.CENTER,drawPanel);frame.setSize(300,300);frame.setVisible(true);}public void actionPerformed(ActionEvent event){frame.repaint();}}

0 0