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From: skipt@inuxm.UUCP (M Tourville)
Newsgroups: net.micro.mac
Subject: MacPaint Bug (?)
Message-ID: <267@inuxm.UUCP>
Date: Tue, 30-Jul-85 10:23:42 EDT
Article-I.D.: inuxm.267
Posted: Tue Jul 30 10:23:42 1985
Date-Received: Wed, 31-Jul-85 08:18:44 EDT
Distribution: na
Organization: AT&T Consumer Products, Indianapolis
Lines: 62

The following describes what I believe to be a bug in Macpaint
regarding the paintcan.

Open Macpaint, and using Edit Patterns, create the following
patterns:

			xxxx xxx
			x
			x
			x
					Pattern 1
			x
			x
			x
		
		
			xxxx xxx
			x
			x
			x
			    x		Pattern 2
			x
			x
			x
		
		
		
			xxxx xxx
			x
			x   x
			x   x
			  xxxxx		Pattern 3
			x   x
			x   x
			x
		
		
		
			xxxx xxx
			x
			x xxxxx
			  xxxxx		Pattern 4
			x xxxxx
			x xxxxx
			x


(Before proceeding, it might be helpful to try a couple of filled-in
shapes to see how these patterns perform.)  Pattern 1 essentially
creates "graph paper", and the other patterns fill in the blocks
of the graph paper.  Notice that the way the patterns are constructed
allows white space to be connected throughout the paper, and one would
therefore think that an area of the "graph paper" filled in with
pattern 4 could be erased (leaving just the graph paper behind) by
filling it with the paint can using pattern 1.  Not so--in fact the
performance is unusual and seems to depend on the relative "density"
of the pattern filling in each block of graph paper.  Experiment
with different patterns and different orders of filling areas to
get a feel for some of the strange things that happen.

The Macpaint manual is very careful to show that paint can leak
through if all the lines are not joined (pg 17).  What gives?