Drawing images in Java

[Atlan]

Hi all.

I'm trying to use Java to make a map designer for a tabletop rpg. So far, its going fairly well, but I've got one big problem: When I display the map, if I manipulate the image box (make it bigger/smaller), it re-runs the entire program, including the methods that built the map in the first place- meaning that the entire map changes completly.

import java.awt.*;

class GraphicsProgram extends Canvas{

    public GraphicsProgram(){
        setSize(200, 200);
        setBackground(Color.white);
    }

    public static void main(String[] argS){

         //GraphicsProgram class is now a type of canvas
          //since it extends the Canvas class
          //lets instantiate it
        GraphicsProgram GP = new GraphicsProgram();  

        //create a new frame to which we will add a canvas
        Frame aFrame = new Frame();
        aFrame.setSize(1000, 1000);
        
        //add the canvas
        aFrame.add(GP);
        
        aFrame.setVisible(true);
    }

    public void paint(Graphics g)
    {
    	map1 test = new map1();
    	test.make1();
    	test.setElevation(1);
     
        g.setColor(Color.blue);
        g.drawLine(30, 30, 80, 80);
        g.drawRect(20, 150, 100, 100);
        g.fillRect(20, 150, 100, 100);
        g.fillOval(150, 20, 100, 100); 
  	  {	    
  	    for(int i = 0; i < 99; i++)
  	    {
  	    	for(int i2 = 0; i2 < 99; i2++)
  	    	{
  	    		int [] temp =test.cellArray[i][i2].getCol();
  	    		g.setColor(new Color(temp[0], temp[1], temp[2]));
  	    		g.fillRect((i*10), (i2*10), 10, 10);
  	    	}
  	    }
  	  }        
    }
}

So it runs the bolded section everytime it redraws the image. Is there a different way of doing images so it avoids this?

[Fou-Lu]

Depending on what is the construction for the Map1, then I'd also agree that the problem is what you have bold there.
Assign a member property for map1 for the GraphicsProgram class. Then it can be used without constructing a new object. Alternatively create a singleton for the map1 class.
As for better, you can write a class that takes care of the zooming for you. You may want to google that up for a pre-existing panel.