> I'm using Dolphin Smalltalk 2.1 and I have some questions related
> with bitmap operations. First I'd like to know how to save a Bitmap or
> any Canvas to an external file (not neccessarily as an .bmp file but
> just to be able to load it later into an Bitmap object).
The best way I know to create bitmap files is to use Ian's DIBitmap class,
or one its successors.
> Then how can I
> organize all bitmaps that I'm using in one class to save them all just
> to one file - do I have to create my own "Bitmap manager" or any system
> class would be of any help ?
It's not terribly elegant, but, the usual way to do this is to create a
single bitmap with the sub-images stacked from left to right. Knowing how
large each bitmap is, you can then locate the one you want.
> Second question is if I can show (and if so then how) a bitmap with
> transparency ?
The best place I know of to get information on this kind of thing is
Petzold's book. Look for rastar operations, aka "ROP" associated with
BitBlt. FWIW, I think the book was at its best around the third edition;
before that, it wasn't fully polished, and since then, one can argue that
it's bloated too much for its own good.
Have a good one,
Bill
--
Wilhelm K. Schwab, Ph.D.
[hidden email]
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