drawdemo.java

来自「java2的应用软件」· Java 代码 · 共 67 行

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

class DrawPanel extends JPanel
{
	public int chx=100,chy=100,xori=100,yori=100;
	public DrawPanel()
	{
		setBackground(Color.WHITE);
		addMouseMotionListener(new MouseMotionAdapter()
		{
			public void mouseMoved(MouseEvent me)
			{
				xori=chx;
				yori=chy;
				chx=me.getX();
				chy=me.getY();
				repaint();
			}
		}
	);
    }
    public void paint(Graphics g)
    {
    	g.drawLine(0,0,100,100);
    	g.drawLine(0,100,100,0);
    	g.setColor(Color.BLUE);
    	g.drawLine(40,25,250,80);
    	g.drawLine(75,90,400,400);
    	g.setColor(Color.GREEN);
    	g.drawRect(10,10,60,50);
    	g.drawRect(100,10,60,50);
    	g.setColor(Color.RED);
    	g.drawRoundRect(190,10,60,50,15,15);
    	g.fillArc(100,100,70,90,0,270);
    	g.setColor(Color.CYAN);
    	g.fillOval(200,100,160,90);
    	g.drawLine(150,150,400,40);
    	g.drawLine(5,290,80,19);
    	g.setColor(Color.WHITE);
    	g.drawLine(xori,yori-10,xori,yori+10);
    	g.drawLine(xori-10,yori,xori+10,yori);
    	g.setXORMode(Color.BLACK);
    	g.drawLine(chx,chy-10,chx,chy+10);
    	g.drawLine(chx-10,chy,chx+10,chy);
    	g.setPaintMode();
    }
}

public class DrawDemo extends JFrame
{
	public DrawDemo()
	{
		Container cp=getContentPane();
		setBackground(Color.WHITE);
		DrawPanel dp=new DrawPanel();
		cp.setLayout(new BorderLayout());
		cp.add(dp,BorderLayout.CENTER);
		setSize(400,250);
		show();
	}
	public static void main(String args[])
	{
		new DrawDemo();
	}
}