Re: [AD] clipping, sub bitmaps

[Thomas Fjellstrom <tfjellstrom@xxxxxxxxxx>]

On Tue August 18 2009, Matthew Leverton wrote:
> On Tue, Aug 18, 2009 at 11:23 AM, Elias
>
> Pschernig<elias.pschernig@xxxxxxxxxx> wrote:
> > But yes, the origin as well as the offset can both easily be done in
> > user code by simply changing the parameters passed to drawing functions.
>
> I don't really like setting the offset... it seems like approaching
> the problem from the wrong side. E.g., the smaller entity (the
> "sprite") is telling the larger entity (the "canvas") what to do. I
> think conceptually it's better to make the user specify additional
> offsets when blitting. To me, you're almost moving Allegro into a
> higher level sprite-management role with supporting offsets.
>
> On the flip side, specifying the origin is just a natural extension of
> clipping and another way to do sub-bitmaps. It almost always would be
> used with the parent object telling the child object where to draw
> itself, which makes sense from an OOP standpoint--especially with
> Allegro 5's implicit target bitmap. Those types of transformations are
> easy to understand.
>
> But I'm not opposed to adding offsets. I just wouldn't use it, and I
> think it gives a confusing and false impression of what Allegro is. (I
> can just imagine people always blitting to 0,0 and using bitmap
> offsets exclusively to control things...)

What is it exactly do you want? You want Sub bitmaps but don't want to use 
offsets? That's what sub bitmaps are :o

> --
> Matthew Leverton
>
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-- 
Thomas Fjellstrom
tfjellstrom@xxxxxxxxxx