du41.java

清华大学java2 程序设计基础的绘图中的再现,希望喜欢,也是很不错的一些程序！

import java.awt.*;
import java.awt.event.*;
public class du41 extends Frame implements MouseMotionListener,MouseListener
{
	static du41 frm=new du41();
	int ox,oy,px,py,status=0;
	int ox1,oy1,px1,py1;
	public static void main(String args[])
	{
		frm.setTitle("绘制圆和椭圆");
		frm.setLayout(null);
		frm.setSize(500,500);
		frm.setLocation(100,200);
		frm.addMouseListener(frm);
		frm.addMouseMotionListener(frm);
		frm.setVisible(true);
	}
	public void mouseMoved(MouseEvent e)
	{
		ox=e.getX();
		oy=e.getY();
		status=0;
	}
	public void mouseDragged(MouseEvent e)
	{
		Graphics g=getGraphics();
		g.setXORMode(Color.black);
		g.setColor(Color.yellow);
		if(status==1)
		{
			g.drawOval(ox,oy,px,py);
		}
		else
		{
			ox=e.getX();
			oy=e.getY();
			status=1;
		}
		px=Math.abs(e.getX()-ox);
		py=Math.abs(e.getY()-oy);
		g.drawOval(ox,oy,px,py);
		ox1=ox;oy1=oy;px1=px;py1=py;
	}
	public void mouseReleased(MouseEvent e)
	{
		Graphics g=getGraphics();
		g.setColor(Color.red);
		g.drawOval(ox1,oy1,px1,py1);
	}
	public void mousePressed(MouseEvent e){}
	public void mouseEntered(MouseEvent e){}
	public void mouseExited(MouseEvent e){}
	public void mouseClicked(MouseEvent e){}
}