Path: utzoo!mnetor!uunet!lll-winken!lll-tis!ames!ncar!gatech!bloom-beacon!mit-eddie!mit-amt!dlleigh From: dlleigh@mit-amt.MEDIA.MIT.EDU (Darren L. Leigh) Newsgroups: comp.sys.amiga.tech Subject: Horizontal scrolling problems Message-ID: <2465@mit-amt.MEDIA.MIT.EDU> Date: 10 May 88 04:46:15 GMT Reply-To: dlleigh@media-lab.media.mit.edu.UUCP (Darren L. Leigh) Organization: MIT Media Lab, Cambridge MA Lines: 21 I am trying to create a hi-res, interlaced horizontally scrolling display for use in my heart monitor project. I have been having some weird problems with wide bitmaps and with the ScrollVPort function. When the bitmap I am using is 1024 or fewer pixels wide, the display is fine and I just get some hashing when I call ScrollVPort (I know the docs said there would be some hashing, but that much?!?). When the bitmap is 1025 or more pixels wide, I get junk on the screen (even after clearing the associated rastport, and without doing any scrolling). The junk seems to scroll OK, but jumps around a lot. I don't seem to be able to draw onto the junk either. The bitmap in question is attached to the second rasinfo structure of a dual playfield display (many thanks to those who helped me get that working), but I get the same problem with single playfield displays. Am I doing something wrong? Is there a bug? Or am I just going crazy? ============================================================================= Darren Leigh dlleigh@media-lab.mit.edu 362 Memorial Dr. mit-amt!dlleigh Cambridge, MA 02139