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000127_icon-group-sender _Fri Jun 6 09:56:47 1997.msg
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Received: from kingfisher.CS.Arizona.EDU by cheltenham.cs.arizona.edu; Fri, 6 Jun 1997 14:37:02 MST
Received: by kingfisher.CS.Arizona.EDU; (5.65v3.2/1.1.8.2/08Nov94-0446PM)
id AA06364; Fri, 6 Jun 1997 14:37:02 -0700
Message-Id: <3398333F.6E1D@simpson.edu>
Date: Fri, 06 Jun 1997 09:56:47 -0600
From: dfgfshhghfhg <newell@simpson.edu>
Reply-To: newell@simpson.edu
Organization: simpson college
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To: icon-group@cs.arizona.edu
Subject: Hello folks - question about win95 impl. and drawop
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Hello folks,
Nice to talk to you all again (even if it is via email) after
quite awhile....
I have a question/problem. I use Icon in a few of my courses here
at Simpson (AI,Prog Langs and Graphics). I decided to try to use
the Win95 implementation in my adult learning Graphics course (i.e.
continuing ed.) this semester in order to allow the students, many
of whom work full-time, to be able to code at home. In the past, I
have used the UNIX version.
My problem is this - during class I noticed that a program I had
written some time ago that more or less implemented a drawing
program (on the order of the old MacDraw) did not operate
correctly. I had not tested the program before class on Win95 (an
obvious mistake) and spent some time spinning my wheels trying to
figure out the problem. As you might have guessed the problem was
with the attribute drawop.
The students were trying to implement standard rubber-banding
techniques which require lines to be put down in exclusive-or mode
(reverse) until the final drawing when they are drawn in copy mode
(Or mode). I eventually noticed the mention in the win95 report
that drawop does not work in "some" example programs and that it
"does not work the same as in other implementations".
Is there a way around this or a fix available? I can't see anyway
to work with interactive graphics without the ability to change
drawing modes at will. Any sort of CAD program would seem to be out
of the question wihtout some very messy work-arounds.
I'm trying to figure out if I need to switch them all over to the
Unix box or if I can perhaps manage to keep them in the environment
most of them are most comfortable around.
I'm curious too, about the nature of the problem as it resulted in
some bizarre behavior in some programs. I appreciate any help or
insight you might be able to put on this - thanks,
Gary Newell
p.s. I would have sent this to Clint but I've been bugging him
quite a bit lately with stupid Icon questions and I thought I should
spread the wealth of stupid questions I have around :-)