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help w/drawing, bitmaps
- To: email@example.com
- Subject: help w/drawing, bitmaps
- From: spector@cs.UMD.EDU (Lee Spector)
- Date: Fri, 5 Jul 91 10:59:30 -0400
(Warning: These are the questions of a mac-low-level-programming novice who
doesn't have Inside Macintosh!)
I have a window into which I draw a scene, using calls to #_PaintRect.
Since the scene is mostly white, I first #_EraseRect the whole thing;
painting everything including the white is much slower. The scene is
animated (slowly and simply), and of course, the erasures at the start
of every update create an annoying flicker.
I guess that the thing to do is to draw into some sort of offscreen
buffer (another view? a subview?), and then to copy (how fastest?) the
result into the window. Although I'm sure this is a common situation,
I didn't see any hints in the manual, so I thought I'd ask if there an
obvious, simple way to do this that everyone uses.
I'm also curious about bitmaps: the functions documented in the MCL manual
don't seem capable of accomplishing anything without leaving the high-level
lisp interface. You can make bitmaps and copy stuff between bitmaps, but I
don't see how you get anything into or out of them - either to/from normal
lisp data structures or to/from views. Is there any way to use them without
delving into Inside Macintosh and using low level record references?
I couldn't find any use of bitmaps in the Examples folder... I have the
feeling that I'm missing something very obvious.
Thanks for any help you can provide, -Lee (firstname.lastname@example.org)