From: Bill Kelly <billk@...>
Date: 2006-02-22T01:18:26+09:00
Subject: Re: How can I evaluate and visualize code instead of running it.

Hi,

From: "anne001" <anne@wjh.harvard.edu>
>I am using a tree and traversing down a tree to generate opengl code
> How could I easily list the opengl code that I am generating, instead
> of running it?
> 
>  def applytransform
>    GL.PushMatrix();
>    GL.Translate(*@Translation);
>    GL.Translate(*@jointP);
>    if @parent != nil
>      GL.Translate(*@parentjointP);
>    end
>    GL.Rotate(*@rotation);
>    GL.Translate(*@jointP.minus);
>  end
> 
>  def traversetree
>    GL.Clear(GL::COLOR_BUFFER_BIT);
>    GL.PushMatrix();
>    applytransform
>    @children.each {|childnode| childnode.traversetree}
>    drawprimitive
>    GL.PopMatrix();
>    GLUT.SwapBuffers();
>  end

Maybe one possibility:

require 'opengl'

RealGL = GL

class LoggingGL
  class << self
    def method_missing(meth, *args)
      puts "#{meth}(#{args.join(', ')})"
      RealGL.send(meth, *args)  # remove this line if you don't want to really call GL
    end
    def const_missing(const)
      RealGL.const_get(const)
    end
  end
end

GL = LoggingGL

#####################################

The above will turn this:

  GL.MatrixMode(GL::PROJECTION)
  GL.LoadIdentity
  GL.Scaled(1.5, 1.2, 1.0)

Into the following output:

  MatrixMode(5889)
  LoadIdentity()
  Scaled(1.5, 1.2, 1.0)


Hope this helps,

Bill