On 15.07.2011 13:52, sam.hack...@sent.com wrote:
On Thu, 14 Jul 2011 13:57 -0700, "Michael Carius"
<michael.a.car...@gmail.com> wrote:
# Python 2.x code
class MySurface(object):
def __init__(self, obj):
if isinstance(obj, tuple):
self._surf = pygame.Surface(*tuple)
elif isinstance(obj, pygame.Surface):
self._surf = obj
def __getattr__(self, attr):
return getattr(self._surf, attr)
This looks the most promising, but I couldn't actually get it to work.
What I want to do, is add extra attributes to a pygame.Surface object,
such as pos and size, including _abs attributes that find the position
relative to the screen. I'm using this in my GUI toolkit (which I
talked about doing for GSoC earlier in the year). You can see the
current surface.py module at
http://bazaar.launchpad.net/~dreamsorcerer/simplegc/trunk/view/head:/sgc/surface.py
This works perfectly if I create a new surface by passing in a tuple,
but I'm not sure how to get the same effect by passing in an existing
pygame.Surface object.
Thanks,
Sam Bull
Hi
Peeking through your code I would suggest to use composition instead of
inheritance. It is more flexible, but might look a bit more complex
first. And personally I would think twice before overriding __getattr__.
You know, in the newer pygame version there is a copy method ( see:
http://www.pygame.org/docs/ref/surface.html#Surface.copy).
If you still prefere to use inheritance and make an SurfaceObject, then
maybe you could use the Surface.copy method and a metaclass to create a
fancy SurfaceObject with the desired behavior.
~DR0ID
