Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!wuarchive!zaphod.mps.ohio-state.edu!rpi!uupsi!sunic!liuida!micja
From: micja@IDA.LiU.SE (Michael Jansson)
Newsgroups: comp.sys.amiga.tech
Subject: Re: Thick lines.
Message-ID: <1990Aug16.111836.26806@ida.liu.se>
Date: 16 Aug 90 11:18:36 GMT
References: <1237.26ca7370@waikato.ac.nz>
Sender: news@ida.liu.se (News Subsystem)
Organization: CIS Dept, Univ of Linkoping, Sweden
Lines: 46

In article <1237.26ca7370@waikato.ac.nz> hamish@waikato.ac.nz writes:
>
>I've been playing with a program for a while now, but I really need a 
>FAST! algorithm for drawing thick lines of any arbitrary width. (In all
>rotations). The lines at an angle must also look consistent with the line
>straight and be able to be adjusted for aspect ratio. At the moment I use
>an assembly routine to draw ellipses (appearing as circles on screen) but
>it is too slow. Anyone help me?
>
>Thanks in advance.

I think I have something that fits that description. I have a function in
my vFont.library (which is a standard amiga library used for drawing
outline fonts) that will give you the two sides of a poly-line that is
arbitrarily thick. It is consistent for all angels, but I don't adjust for
aspect ration. You could easily adjust that by scaling the poly-line
first, using another function in the library. (Yes the library contains all
sorts of geometrical functions such as rotating, clipping, scaling, moving
etc). Those functions uses only 32-bit integers, lookup-tables etc, so it
is fast and accurate enough for my purpose at least.

The library will be available as a PD/SW/or-something in a couple of weeks
or so...


>
>-- 
>==============================================================================
>|  Hamish Marson                        |  Internet  hamish@waikato.ac.nz    |
>|  Computer Support Person              |  Phone  (071)562889 xt 8181        |
>|  Computer Science Department          |  Amiga 3000 for ME!                |
>|  University of Waikato                |                                    |
>==============================================================================
>|Disclaimer:  Anything said in this message is the personal opinion of the   |
>|             finger hitting the keyboard & doesn't represent my employers   |
>|             opinion in any way. (ie we probably don't agree)               |
>==============================================================================



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