Pos mporo na piaso to graphics object tou JPanel?

[hadjici2]

exo auto to kodiko

 

public class DrawingBoard extends JPanel

{

Graphics g;

 

public DrawingBoard()

{

setBackground(Color.WHITE);

}

 

public void paintComponent(Graphics gr)

{

g = gr.create();

 

// Paint background

super.paintComponent(gr);

}

 

public void drawRectangle()

{

//Set current drawing color

g.setColor(Color.BLACK);

 

//Draw a rectangle centered at the mid-point

g.drawRect(10, 10, 10, 600);

}

}

 

To provlima einai oti opote xrisimopio to drawRectangle() se ena DrawingBoard object den mou emfanizi to orthogonio.Prepi na exo ton kodiko tou drawRectangle() sto paintComponent(Graphics gr) gia na emfanisti to orthogonio alla ego den to thelo etsi.

 

kapios kapia lisi?

[Dionisos]

Diavase to Painting in AWT and Swing ths Amy Fowler pou einai kai h leader tou Swing project.