Handing Graphics Object To Run() Method

Question

Hi,
I have written code that draws 20 x 20 lines over a bufferedimage and the performs calculations on each of the cells created by this division.
I want to be able to show a blue square over the cell currently being worked on. As the calculations progress the square moves from cell to cell until complete.
The problem I face is that when i have my buffered image displayed and then run through the calculations the whole process is done so fast that you never see the blue square moving you just see the completed state. The obvious answer to this is to use a thread but how do I hand "Graphics g" to a thread as an argument? Whenever I try
public void run(Graphics g)I get a compile error saying that the class should be declared abstract. Is it ever possible to hand run() an argument?
Any other suggestions as to how I can show this drawing process slow enough to be visible to the user?

Answer 1

Look at this:
import java.awt.event.*;
import java.awt.*;
public class Barc extends Frame 
     mapPanel     map  = new mapPanel();
     Calc         calc = new Calc(map);
public Barc()
     addWindowListener(new WindowAdapter()
    {     public void windowClosing(WindowEvent ev)
          {     dispose();
               System.exit(0);}});
     setBounds(10,10,500,440);
     add(map);     
     setVisible(true);
     new Thread(calc).start();
public class mapPanel extends Panel
     int cell = -1;
     int xc,yc;
public mapPanel()
public void paintCell(int c)
     if (cell != -1)
          yc = (cell/20)*20+2 ;
          xc = (cell%20)*20+2;
           repaint(xc,yc,17,17);
     cell = c;
     yc = (cell/20) * 20+2 ;
     xc = (cell%20)*20+2;
     repaint(xc,yc,17,17);
public void update(Graphics g)
     paint(g);
public void paint(Graphics g)
     Rectangle r = g.getClipBounds();
     g.setColor(Color.pink);
     g.fillRect(r.x,r.y,r.width,r.height);
     g.setColor(Color.black);
     for (int x=0; x < 21; x++) g.drawLine(x*20,0,x*20,400);
     for (int y=0; y < 21; y++) g.drawLine(0,y*20,400,y*20);
     if (cell != -1)
          g.setColor(Color.blue);
          g.fillRect(xc,yc,17,17);
public class Calc implements Runnable
     mapPanel  map;
public Calc(mapPanel m)
     map       = m;
public synchronized void run()
     int    i = 0;     
     double d = 1000;
     while (i < 400)
           map.paintCell(i++);
          for (int r=0; r < 1111111; r++) d = d/124.67*131.46;
public static void main(String[] args )
     new Barc();
Noah