Computer Science Canada

Paint in a separate class?
Author:  Fozmik [ Thu Jan 08, 2009 1:58 am ]
Post subject:  Paint in a separate class?
I'm trying to create a class which paints a square using the method paint (Graphics g). In another class, in my main method, I create an AWT frame and an object of the square-painting class, but the square does not appear on my frame.

How can I make something like this work?

code:

package prog;
import prog.*;
import java.awt.*;
public class MainClass{
    public static void main(String[] args){
        Square brdSq1 = new Square(40, 0);
        Frame game = new Frame("Test");
        game.setSize(280, 280);
        game.show();
    }
}

//new file

package prog;
import java.awt.*;
public class Square{
    Color sqClr = new Color(0xf9, 0xf8, 0xea);
    int sqX = 0, sqY = 0;
    public Square(int x, int y){
        sqX = x;
        sqY = y;
    }
    public void paint(Graphics g){
        g.setColor(sqClr);
        g.fillRect(sqX, sqY, 40, 40);
    }
}


Sorry if this is a dumb question.
Author:  wtd [ Thu Jan 08, 2009 3:38 am ]
Post subject:  Re: Paint in a separate class?
Well, have you added the Square object to your Frame?

You could use the Frame class' [url=http://java.sun.com/j2se/1.4.2/docs/api/java/awt/Container.html#add(java.awt.Component)]add[/url] method, but the signature for that requires that you add a java.awt.Component object. Your Square object is not a Component, so it won't work there.

Do you understand the is a relationship in object-oriented programming?
Author:  Fozmik [ Thu Jan 08, 2009 3:30 pm ]
Post subject:  Re: Paint in a separate class?
I tried adding the Square to Frame with,
code:
game.add(brdSq1);


and making the Square a component with,
code:
public class Square extends Panel{
...
}


It is still not appearing though

*edit* It works now, thanks

:


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