كيف أرسم على window أخرى؟

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import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import java.util.*;

class shape

{

private Point dim1,dim2;

private Color c;

void setdata(Point dim1,Point dim2,Color c)

{

this.dim1=dim1;

this.dim2=dim2;

this.c=c;

}

Point getdim1()

{

return dim1;

}

Point getdim2()

{

return dim2;

}

Color getColor()

{

return c;

}

void calcdiff()

{

dim2.x=dim2.x-dim1.x;

dim2.y=dim2.y-dim1.y;

}

void draw(Graphics g)

{

}

}

/**

*

*

Title:

*

Description:

*

Copyright: Copyright © 2003

*

Company:

* @author unascribed

* @version 1.0

*/

class rect extends shape

{

void draw(Graphics g)

{

//we need to call thc calcdiff

g.setColor(getColor());

g.drawRect(getdim1().x,getdim1().y,getdim2().x,getdim2().y);

}

}

class circle extends shape

{

void draw(Graphics g)

{

//we need to call thc calcdiff

g.setColor(getColor());

g.drawOval(getdim1().x,getdim1().y,getdim2().x,getdim2().y);

}

}

class line extends shape

{

void draw(Graphics g)

{

g.setColor(getColor());

g.drawLine(getdim1().x,getdim1().y,getdim2().x,getdim2().y);

}

}

/**

*

*

Title: this my class

*

ya lil ya 3in

*

Copyright: Copyright © 2003

*

Company:

* @author unascribed

* @version 1.0

*/

public class paintbrush extends JFrame implements ActionListener,MouseListener,MouseMotionListener

{

Point pold,pnew;

int flag=1;

JPanel p=new JPanel();

JButton b1=new JButton("Rect");

JButton b2=new JButton("Circle");

JButton b3=new JButton("Line");

shape shape1,shape2;

Vector v=new Vector();

public paintbrush()

{

Container c=getContentPane();

p.setLayout(new GridLayout(3,1));

b1.addActionListener(this);

b2.addActionListener(this);

b3.addActionListener(this);

c.addMouseListener(this);

c.addMouseMotionListener(this);

p.add(b1);

p.add(b2);

p.add(b3);

c.add(p,"East");

setSize(500,500);

setVisible(true);

}

public void paint(Graphics g)

{

System.out.println("aaa");

super.paint(g);//to clear the screen

for(int i=0;i

{

shape2=(shape)v.get(i);// casting from object to shape

shape2.draw(g);

}

switch(flag)

{

case 1:

shape1=new rect();

shape1.setdata(pold,pnew,Color.red);

shape1.calcdiff();

System.out.println(shape1.getdim1());

System.out.println(shape1.getdim2());

shape1.draw(g);

break;

case 2:

shape1=new circle();

shape1.setdata(pold,pnew,Color.red);

shape1.calcdiff();

shape1.draw(g);

break;

case 3:

shape1=new line();

shape1.setdata(pnew,pold,Color.red);

shape1.draw(g);

break;

}

}

public void actionPerformed(ActionEvent e)

{String s=e.getActionCommand();

if(s.equals("Rect"))

flag=1;

else

if(s.equals("Circle"))

flag=2;

else

flag=3;

}

public void mouseClicked(MouseEvent e)

{

}

public void mousePressed(MouseEvent e)

{

e.translatePoint(4,20);

if(e.getModifiers()==e.BUTTON1_MASK)

{

pold=e.getPoint();

}

}

public void mouseReleased(MouseEvent e)

{

v.addElement(shape1);

}

public void mouseExited(MouseEvent e)

{

}

public void mouseEntered(MouseEvent e)

{

}

public void mouseDragged(MouseEvent e)

{

e.translatePoint(4,20);

if(e.getModifiers()==e.BUTTON1_MASK)

{

pnew=e.getPoint();

repaint();

}

}

public void mouseMoved(MouseEvent e)

{

}

public static void main(String []arg)

{

new paintbrush();

}