JPanel实现一个专门的绘图区域

最新推荐文章于 2025-01-20 21:48:33 发布

summersunrain

最新推荐文章于 2025-01-20 21:48:33 发布

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分类专栏： Java

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本文介绍如何使用Java Swing创建自定义JPanel类，通过重写paintComponent方法实现动态绘图功能，包括画圆和正方形，并通过按钮触发不同的绘图操作。

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package javawork;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class CustomPanelTest extends JFrame{

	private JPanel buttonPanel;
	private CustomPanel myPanel;
	private JButton circleButton,squareButton;
	
	public CustomPanelTest()
	{
		super("创建定制Jpanel类");
		myPanel=new CustomPanel();
		myPanel.setBackground(Color.GREEN);
		
		squareButton=new JButton("画正方形");
		squareButton.addActionListener(new ActionListener() {
		
			public void actionPerformed(ActionEvent e)
			{
				myPanel.draw(2);
			}
			
		}
		);
		
	
		circleButton=new JButton("画圆形");
		circleButton.addActionListener(new ActionListener() {
		
			public void actionPerformed(ActionEvent e)
			{
				myPanel.draw(1);
			}
			
		}
		);
		
		buttonPanel=new JPanel();//设置另一个面板存放两个按钮
		buttonPanel.setLayout(new GridLayout(1,2));
		
		buttonPanel.add(circleButton);
		buttonPanel.add(squareButton);
		
		Container container=getContentPane();
		container.add(myPanel,BorderLayout.CENTER);
		container.add(buttonPanel,BorderLayout.SOUTH);
		
		
		setSize(300,150);
		setVisible(true);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		

	}
	
}



package javawork;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;

public class CustomPanel extends JPanel{

	private int shape;
	public void paintComponent(Graphics g)//重写paintComponent，repaint时调用
	{
		super.paintComponent(g);
		g.setColor(Color.red);
		if(shape==1)
			g.fillOval(50, 10, 60, 60);
		else if(shape==2)
			g.fillRect(190, 10, 60, 60);

	}
	public void draw(int shapeToDraw)
	{
		this.shape=shapeToDraw;
		this.repaint();
	}
}


public class mainTest {

	public static void main(String args[])
	{
		CustomPanelTest n=new CustomPanelTest();
	}
}