Article View: comp.sys.amiga.tech
Article #2017Automatic window clipping
From: Ben W. Discoe
Date: Tue, 07 Nov 1989 07:07
Date: Tue, 07 Nov 1989 07:07
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I'm writing a structed graphics program that allows unlimited zoom
(simply changing scaling factors) and until recently could count on the
automatic clipping the graphics library does using the Layer limits.
However, when I start to draw line WAY off the screen (>several thousand
pixels) two things start happening:
1) the lines become jagged when they appear on the screen
2) eventually the machine dies or the program freezes in a state
of intense CPU usage.
I realize what I should do is test the endpoints of each line I draw
and not draw the ones too far off, however, I'd like to know a few things:
1) What are the exact limits to the gfx lib clipping?
2) Does is make a difference if the number you pass "Draw()"
is great than a WORD variable will allow?
3) Why does the machine die? Does it have to do with the line
drawing being done in hardware?
I couldn't find anything in the RKMs about this and I hope it isn't a
case of RTFM. Thanks much,
Ben "struggling starving student stereotype"
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arc1-ca.pugleaf.net!utzoo!attcan!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!usc!henry.jpl.nasa.gov!elroy.jpl.nasa.gov!cit-vax!tybalt.caltech.edu!bdiscoeShow Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!usc!henry.jpl.nasa.gov!elroy.jpl.nasa.gov!cit-vax!tybalt.caltech.edu!bdiscoe From: bdiscoe@tybalt.caltech.edu (Ben W. Discoe) Newsgroups: comp.sys.amiga.tech Subject: Automatic window clipping Summary: What are the limits to window clipping? Message-ID: <12540@cit-vax.Caltech.Edu> Date: 7 Nov 89 07:07:10 GMT Sender: news@cit-vax.Caltech.Edu Reply-To: bdiscoe@tybalt.caltech.edu.UUCP (Ben W. Discoe) Distribution: usa Organization: California Institute of Technology Lines: 23