Article View: comp.sys.mac
Article #24563Re: COLOR GRAPHICS on mac-II
From: Michael J. Larsen
Date: Mon, 01 Feb 1988 16:39
Date: Mon, 01 Feb 1988 16:39
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In article <323@bnl.ARPA> wishart@bnl.UUCP (james wishart) writes: > >I think a lot of people would like to know about a program to display (x,y,z) data in color coded maps, so please also post your responses to the net. >Thanks, > Why not just set a character pointer variable "screen" to the upper left hand corner of the screen and treat the screen as a long array? E.g. screen = thePort->portBits.baseAddr (or something like that), *(screen + y * 1024L + x) = color. Note that on the MacII, each line is 1024 pixels wide (the rightmost 384 being off the screen). Moreover, all the data for a single pixel is clumped together. Thus, for instance, in 16 color mode, screen memory is arranged with two pixels per byte, rather than in 4 separate planes with 8 quarter-pixels per byte. -Michael Larsen
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Path: arc1-ca.pugleaf.net!utzoo!mnetor!uunet!lll-winken!lll-lcc!lll-tis!ames!rutgers!princeton!phoenix!mjlarsen From: mjlarsen@phoenix.Princeton.EDU (Michael J. Larsen) Newsgroups: comp.sys.mac Subject: Re: COLOR GRAPHICS on mac-II Message-ID: <1606@phoenix.Princeton.EDU> Date: 1 Feb 88 16:39:05 GMT References: <659@ut-emx.UUCP> <323@bnl.ARPA> Reply-To: mjlarsen@phoenix.Princeton.EDU (Michael J. Larsen) Organization: Princeton University, NJ Lines: 15