Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!ukma!psuvm.bitnet!cunyvm!byuvax!loganj
From: loganj@byuvax.bitnet
Newsgroups: comp.sys.mac.programmer
Subject: Mac II color graphics & animation questions
Message-ID: <210loganj@byuvax.bitnet>
Date: 24 Jun 88 00:23:27 GMT
Lines: 20

We are converting our widely distributed 3-D Graphics program "Movie BYU" to
Macintosh II, and we have questions about the color graphics:

1.  We found that animation on a Macintosh II color screen slows down
    significantly if you simply move the window position away from the
    left edge of the screen (or any position where x != 0).  Why, and
    is there any workaround?

2.  We need to produce color graphics by scan lines (for raster devices),
    and doing this one pixel at a time is too slow.  Any suggestions?
    What is the fastest way of creating and displaying a single horizontal
    color line which spans the width of the screen?  In these horizontal
    color lines the color may change with each pixel.  We have thought of
    creating a one line pixelmap in memory and somehow setting the color
    of pixels directly from our program code before "copybits" the line to
    the screen - what do you think of that?

Please respond directly to loganj@byuvax.bitnet

Thanks
jim (loganj@byuvax.bitnet)