From: Lyle Johnson <ljohnson@...>
Date: 2001-11-30T01:34:52+09:00
Subject: [ruby-talk:26929] Re: FXGLViewer - rotate a primitive?


Note sure if this made it last time...

> > Also observe this is on the FOX side, not the FXRuby side.

In the latest release (FXRuby-0.99.180) those FXGLShape subclasses are

actually coded completely in Ruby (see lib/fox/glshapes.rb), so it may be a

little easier to examine the code to see what's going on. The base class

(FXGLShape) is still a wrapper around the C++ class but I may try to change

that too.

> Then the issue would be A> FXRuby took them seriously, B> I don't want to

> ship a FOX patch, or any C++ source, with my project, and C> I don't know

> how to derive from FXGLObject within Ruby yet. But the last option would

> appear to be the best.

>

> Lyle - can I inherit from FXGLObject thru Ruby? I'm asking you first to

> avoid trying and getting all tangled up. Recall that "inherit" imlies I

can

> override the draw() methods.

Yes, you can absolutely derive new Ruby classes from FXGLObject (or its

subclasses) and override their virtual methods. I've attached a subclass of

FXGLCylinder (called MyCylinder) that uses a different rotation matrix for

the cylinder, and a modified version of the "glviewer.rb" that shipped with

FXRuby-0.99.180 that draws one of these MyCylinder shapes instead of a stock

FXGLCylinder. You might choose to add an accessor method that lets you plug

in a different rotation matrix or whatever, but I think you can take it from

there.

Hope this helps,

Lyle