[fetter-devel] vzn vs. oo

[Kenny Tilton]

FTGL is a pretty simple OO library: font class, then subclasses for 
pixmap, texture, extruded, inter alia. One virtual function is "render". 
vzn ends up producing (loosely speaking):

pixmap-render
texture-render
extruded-render
....

Left as an exercise is restoring the OO. What I would be tempted to do is:

(defclass font ....)
(defclass texture-font (font) ...)
(defmethod render ((f texture-font) string)
      (texture-render f string))

Does vzn see enough info to restore the polymorphism of the C++ "render" 
virtual function? Even better would be:

  (defmethod initialize-instance :after ((f texture-font) &key)
      (setf (cpp-instance f) (texture-font-new (font-path f))))

As it is I think Vzn falls short of exposing the FTGL API, by leaving 
restoration of the polymorphism to the user. Or am I missing something 
or some difficulty?

-- 
Kenny

Why Lisp? http://wiki.alu.org/RtL_Highlight_Film

"I've wrestled with reality for 35 years, Doctor, and I'm happy to state I finally won out over it."
    Elwood P. Dowd, "Harvey", 1950