Re: [gl4java-usergroup] Small change in GL4J API needed

[Pontus L. <po...@ly...>]

On Thu, 27 Jan 2000, Max Gilead wrote:

> Hi!
> 
> In my application I need variables gl and glu in GLCanvas public instead
> of protected. It is needed for remote rendering possibilities - for
> example:
> 
> //class in package opengl
> public class GLViewport extends GLCanvas
>     {
>     private ClassThatDrawsObjects ctdo;
> 
>     public void display()
>         {
>         //setup
>         ctdo.drawMyself(this);
>         }
>     }
> 
> //class in package geometry
> public class ClassThatDrawsObjects
>     extends SomeOtherNeededClass
>     {
>     public void drawMyself(GLViewport viewport)
>         {
>         viewport.gl.glBegin(viewport.GL_TRIANGLES);
>             viewport.gl.glVertex*(...);
>             ...
>         viewport.gl.glEnd();
>         }
>     }
> 
> so when program reaches display() method it calls method drawMyself() in
> some other class and this class performs rendering (it needs GLFunc to
> do so). Have I made myself clear? :-)
> 
> Is there any better way to do so? I need this because in my modeler I
> want each object to draw itself.

Can't you just pass gl and glu as parameters to your rendering function?
The way I did it is I wrote a class that extends java.awt.Graphics that
takes gl and glu as arguments to its constructor, and this new Graphics
object is passed as argument to all my rendering functions. 

The reason I decided to extend Graphics is just so that existing classes
written to render using pure JDK methods can now render OpenGL with no
changes ;)

-- 
Pontus Lidman, po...@ma..., Software Engineer
No matter how cynical you get, it's impossible to keep up.
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