On or about Sun, Aug 16, 2009 at 7:57 PM, Richard Jones indited:
> on_draw will be invoked when you need to render the window contents -
> when the window contents are made dirty by some action external to
> your program (window min/max/resize/obscure). If your scene is not
> animated then on_draw is the way to go.
It is also a matter of separation of concerns.
on_draw is for updating the window(s).
your clock-driven events (if you have any), are for modifying/updating
your world.
If you are familiar with the Model View Controller paradigm:
on-draw is part of the View
a clock driven update is part of the Model.
on_mouse_event (and others) is part of the Controller.
That doesn't mean you can't mush a bunch of stuff into one function,
but doing so isn't usually the cleanest way to go.
-Doug
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