[gl4java-usergroup] Re: Question about GL4JAVA

[Sven G. <sgo...@ja...>]

Jean-Marie ABISROR wrote:
> 
> 
> Hi,
> 
> I Have a big problem in the conception of my programs with gl4java
> (Windows version) :
> 
(doesn't care, if it is the dirty win32 os :-)

> I Have a subdirectory opengl in which I want to describe geometrics
> shapes (box,cylinder, etc.).
> In that subdirectory, I have a program named BoxNodeOpenGL.java where
> I have the display() routine for the description of the box.
> 
> In the main directory, I have a program where I'd like to call (only
> once) the constructor cvs = new MyCanvas(640,480), in order to be able
> to call display() in BoxNodeOpenGL.class, CylinderNodeOpenGL.class,
> and so on.
> 
> Is that possible ? How do you implement this kind of structure ?
> Do I need to use GLAnimCanvas with a thread ?
> If you have an example, please send it ...
> Thank's for your help.
> 
> Looking forward to reading from you.
> 
> 
> Jean-Marie ABISROR
> 
> 
> 
> 
Well, I guess you have something like a scenegraph,
a data structure of items, which are renderable !
Just let them implement GLEnum and GLUEnum (just for your convinience),
and design them like:

public interface Node {
	protected Node(GLFunc gl, GLUFunc glu);
	public void draw();
	public void init();
	public void tick(long ms);
}

public class LineNode 
	implements Node, GLEnum, GLUEnum
{
	protected LineNode(GLFunc gl, GLFunc glu)
	{ save the gl, glu paras. }

	public LineNode(GLFunc gl, GLUFunc glu, point p1, point p2)
	{ this(gl, glu); save the p1, p2 }
	
	public void init()
	{ some initialisations ... }

	public void draw()
	{ draw from p1 till p2, using gl and glu }
	
	public void tick(long ms)
	{ move the element with its behavior to its new place,
	  assuming that ms milliseconds are passed (speed, vector, ...)
	  FOR ANIMATION !
	}
}

Threads has nothing todo with this design !

Yours, Sven
-- 
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