Re: New to OOP and polymorphism
From: hiwa (HGA03630_at_nifty.ne.jp)
Date: 02/24/04
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Date: 23 Feb 2004 18:30:09 -0800
"Stephen" <sedelblut@hotmail.com> wrote in message news:<NEr_b.16893$W74.660@newsread1.news.atl.earthlink.net>...
> Hi, I am working on a drawing program for class. It consists of a superclass
> Shape2D where I have subclasses Circle, Square, and Triangle inheriting from
> Shape2D. I also have a main program that is a JFrame where the shapes are
> drawn. I am trying to use polymorphism and the Shape2D class stores the x
> and y coordinates, and has an abstract method draw(). Here's the problem, I
> don't know how to use the paint( Graphics g ) method of JFrame to draw the
> shape using the draw method of each shape. Ideally I would like the shapes
> to be drawn like this:
>
> public void paint( Graphics g )
> {
> Shape2D = new Circle( x, y, radius, fillColor );
> Shape2D.draw();
> }
>
> Something like that (I know that is not a real way to do it, it's just the
> best way I can convey my idea ). How do I do this?? Thanks!
I think you will have to write a JPanel extended class or JLabel
extended class. And you'll add its object to JFrame's ContentPane.
For example:
[code]
public class DrawShapePanel extends Jpanel{
Shape shape;
public DrawShapePanel(Shape s){
shape = s;
...
}
...
...
paintComponent(Graphics g){
super.paintComponent(g);
drawShape(shape, g);
...
}
drawShape(Shape shp, Graphics g){
shp.draw(g);
}
}
[/code]
- Previous message: Adrian Hjelmslund: "Re: How to view the header that ones client / browser generates?"
- In reply to: Stephen: "New to OOP and polymorphism"
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