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From: marchesi@cernvax.UUCP (marchesi)
Newsgroups: net.micro.mac
Subject: Re: Flopping line in MacPaint (rubberband line)
Message-ID: <363@cernvax.UUCP>
Date: Fri, 15-Aug-86 10:51:02 EDT
Article-I.D.: cernvax.363
Posted: Fri Aug 15 10:51:02 1986
Date-Received: Sun, 17-Aug-86 06:15:01 EDT
References: <2693@mit-hermes.ARPA> <1232@trwrb.UUCP> <208@bridge2.UUCP>
Reply-To: marchesi@cernvax.UUCP ()
Distribution: net
Organization: CERN, Geneva/Switzerland
Lines: 27

In article <208@bridge2.UUCP> pvf@bridge2.UUCP writes:
>.........
>The rubberband line is a simple call to polyline with the XOR writing
>mode enabled.  All you have to do is draw the line from the fixed point
>to the variable point, under XOR writing mode:
>
>    1) When the variable point selector moves to a point, and,
>    2) When the variable point selector moves off that point.
>
>Of course, this means that each line is "drawn" twice.  First, to
>make it visible, then again to make it invisible.
>.........

...again: MacPaint does *NOT* XOR...... (but I'd like to learn how
it really works without having to trace it down myself...)

pp

----------------------------------------------------------------------------
Paolo Petta

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