Mail Archives: geda-user/2015/12/22/09:47:39

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Mail Archives: geda-user/2015/12/22/09:47:39
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X-Recipient: geda-user AT delorie DOT com

Date: Tue, 22 Dec 2015 15:47:20 +0100

From: Martin Beranek <martin AT mb5 DOT cz>

To: geda-user AT delorie DOT com

Subject: [geda-user] Self-intersecting polygon appears because of intersection

coordinates rounding

Message-ID: <20151222144719.GN14853@abax>

MIME-Version: 1.0

User-Agent: Mutt/1.5.23 (2014-03-12)

Reply-To: geda-user AT delorie DOT com
--sHrvAb52M6C8blB9
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline

Hi,

I was tracing down the cause for a bug when a polygon sometimes
disappears after component was moved and "Error while clipping PBO_SUB: 3"
is printed. And I have discovered quite nasty issue related to
intersections calculation and rounding.

The little PCB which shows this bug is attached (click in the center of
upper-left silk screen dot in component labeled "*MOVE_ME* and drop it
over second dot, that is 0.2 mm down and 0.1mm right), but I think the
problem behind is much more general.


Imagine part of contour A--B--C such that A->B edge goes approximately
in bottom right direction and B->C edge goes back to the left (located
below A->B, the exact value of angle ABC is not important, say about 45
degrees). The inside of the polygon is "between" points 'A' and 'C'.

Then let's have edge C->D which is part of second contour and which
intersects edge AB really close to the point B.

Calculating the intersection point 'E' and consequent rounding can
result in coordinate which is actually bellow (!) edge BC, not above it
as it should be. So we get contour A-E-B-C which intersects itself (the
edges A-E and B-C intersects and the order of edges and inner/outer
areas is thus wrong at 'E'.

Bit ascii-art of the result:


   A.
     \
      \
C-___  \
 \   `--\-__
  `-,_   \  `-.
      `---E----B
           \__
              `----,
                    `-----D


It seems that current polygon code leave things like this (first contour
A->E->B->C and second C->E->D).

The edge C->E of second contour is labeled "outer" as it lies below
'B->C', so far mostly OK, I guess. But next labeling step at 'E' results
in (wrong) label "inner" because the assumption that inside of the
polygon is to the right from the edge is violated there.


The actual coordinates which lead to this kind of bug are:

 A = [4309892, 10990108]
 B = [4331483, 11008549]
 C = [3998398, 10981358]
 D = [6078476, 11151160]

Calculating intersection between A-B and C-D gives [4331482.44, 11008548.52]
which is rounded to

 E = [4331482, 11008549]

Note that point E is directly to the left from 'B', so below 'B->C'. And
the point 'B' is above 'E->D'. It feels strange that such intersection
and rounding can actually exists, but there is real-world case. And it
totally breaks polygon code.

(I have seen such polygon-disappearing quite often in more complicated
boards, but it is not so easy to make minimal example and trace the
actual cause, so I can not tell it is the same issue every time ...)



What I am wondering about is if there is any sane solution to this
issue. Some 'clever' rounding which avoids self-intersecting lines would
be probably quite complicated to code and maybe computation intensive as
well(?). Maybe still leading to unsolvable situations sometimes?
But is there any other, better way how to avoid this?


Martin



--sHrvAb52M6C8blB9
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment; filename="__bug_minimal.pcb"

# release: pcb 1.99z

# To read pcb files, the pcb version (or the git source date) must be >= the file version
FileVersion[20091103]

PCB["" 10.0000mm 13.0000mm]

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Flags("showdrc,rubberband,nameonpcb,alldirection,clearnew")
Groups("1,6,7,c:2:3:4,8,s:5")
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Attribute("PCB::grid::unit" "mm")
Attribute("PCB::grid::size" "0.1000mm")
Via[6.4000mm 9.9000mm 0.7000mm 0.4000mm 0.0000 0.3000mm "" ""]
Via[2.6000mm 10.2000mm 0.7000mm 0.4000mm 0.0000 0.3000mm "" "thermal(2S)"]
Via[3.9000mm 9.7000mm 0.7000mm 0.4000mm 0.0000 0.3000mm "" ""]
Via[4.7000mm 10.6000mm 0.7000mm 0.4000mm 0.0000 0.3000mm "" "thermal(2S)"]
Via[4.6000mm 12.0000mm 0.6500mm 0.4000mm 0.0000 0.3000mm "" "thermal(1S,6S,7S)"]

Element["hidename" "SOT-363" "Q42" "unknown" 2.9000mm 10.2000mm -1.0000mm -2.8000mm 0 87 ""]
(
	Pad[-0.6500mm 0.7000mm -0.6500mm 1.3000mm 0.4000mm 0.5000mm 0.5000mm "1" "1" "square,edge2"]
	Pad[0.0000 0.7000mm 0.0000 1.3000mm 0.4000mm 0.5000mm 0.5000mm "2" "2" "square,edge2"]
	Pad[0.6500mm 0.7000mm 0.6500mm 1.3000mm 0.4000mm 0.5000mm 0.5000mm "3" "3" "square,edge2"]
	Pad[0.6500mm -1.3000mm 0.6500mm -0.7000mm 0.4000mm 0.5000mm 0.5000mm "4" "4" "square"]
	Pad[0.0000 -1.3000mm 0.0000 -0.7000mm 0.4000mm 0.5000mm 0.5000mm "5" "5" "square"]
	Pad[-0.6500mm -1.3000mm -0.6500mm -0.7000mm 0.4000mm 0.5000mm 0.5000mm "6" "6" "square"]
	ElementLine [-1.3500mm 1.1500mm -1.3500mm 1.1500mm 0.5000mm]
	ElementLine [-1.0500mm -0.6500mm -1.0500mm 0.6500mm 0.2000mm]
	ElementLine [1.0500mm -0.6500mm 1.0500mm 0.6500mm 0.2000mm]

	)

Element["" "SOT-363" "*MOVE ME*" "unknown" 6.6000mm 10.6000mm -1.7000mm 1.2000mm 0 67 ""]
(
	Pad[-1.3000mm -0.6500mm -0.7000mm -0.6500mm 0.4000mm 0.5000mm 0.5000mm "1" "1" "square"]
	Pad[-1.3000mm 0.0000 -0.7000mm 0.0000 0.4000mm 0.5000mm 0.5000mm "2" "2" "square"]
	Pad[-1.3000mm 0.6500mm -0.7000mm 0.6500mm 0.4000mm 0.5000mm 0.5000mm "3" "3" "square"]
	Pad[0.7000mm 0.6500mm 1.3000mm 0.6500mm 0.4000mm 0.5000mm 0.5000mm "4" "4" "square,edge2"]
	Pad[0.7000mm 0.0000 1.3000mm 0.0000 0.4000mm 0.5000mm 0.5000mm "5" "5" "square,edge2"]
	Pad[0.7000mm -0.6500mm 1.3000mm -0.6500mm 0.4000mm 0.5000mm 0.5000mm "6" "6" "square,edge2"]
	ElementLine [-1.1500mm -1.3500mm -1.1500mm -1.3500mm 0.5000mm]
	ElementLine [-0.6500mm -1.0500mm 0.6500mm -1.0500mm 0.2000mm]
	ElementLine [-0.6500mm 1.0500mm 0.6500mm 1.0500mm 0.2000mm]

	)

Element["hidename" "SOT143" "Q41" "unknown" 5.4000mm 3.4000mm -1.4000mm -2.9000mm 0 87 ""]
(
	Pad[0.8500mm 0.7600mm 1.1500mm 0.7600mm 1.0000mm 0.5000mm 1.1000mm "1" "1" "square,edge2"]
	Pad[0.6500mm -0.9600mm 1.3500mm -0.9600mm 0.6000mm 0.5000mm 0.7000mm "2" "2" "square,edge2"]
	Pad[-1.3500mm -0.9600mm -0.6500mm -0.9600mm 0.6000mm 0.5000mm 0.7000mm "3" "3" "square"]
	Pad[-1.3500mm 0.9600mm -0.6500mm 0.9600mm 0.6000mm 0.5000mm 0.7000mm "4" "4" "square"]
	ElementLine [-0.1000mm 1.5000mm 0.1000mm 1.5000mm 0.2000mm]
	ElementLine [-0.1000mm -1.5000mm 0.1000mm -1.5000mm 0.2000mm]
	ElementLine [-0.6500mm -0.4100mm -0.6500mm 0.4100mm 0.2000mm]

	)
Layer(1 "top" "copper")
(
	Line[4.7000mm 10.6000mm 7.6000mm 10.6000mm 0.3000mm 0.4000mm "clearline"]
	Line[7.6000mm 11.2500mm 8.1500mm 11.2500mm 0.3000mm 0.4000mm "clearline"]
	Line[8.1500mm 11.2500mm 8.5000mm 10.9000mm 0.3000mm 0.4000mm "clearline"]
	Line[8.5000mm 10.9000mm 8.5000mm 4.3000mm 0.3000mm 0.4000mm "clearline"]
	Line[5.4000mm 3.1000mm 6.1000mm 2.4000mm 0.3000mm 0.4000mm "clearline"]
	Line[5.4000mm 8.5000mm 5.4000mm 3.1000mm 0.3000mm 0.4000mm "clearline"]
	Line[4.4000mm 4.3600mm 4.4000mm 2.4400mm 0.3000mm 0.4000mm "clearline"]
	Line[2.9000mm 9.2000mm 2.9000mm 11.2000mm 0.3000mm 0.4000mm "clearline"]
	Line[4.8000mm 9.2000mm 6.7000mm 9.2000mm 0.3000mm 0.4000mm "clearline"]
	Line[6.7000mm 9.2000mm 7.4500mm 9.9500mm 0.3000mm 0.4000mm "clearline"]
	Line[6.4000mm 9.9000mm 5.6000mm 9.9000mm 0.3000mm 0.4000mm "clearline"]
	Line[2.2500mm 9.2000mm 2.2500mm 8.6500mm 0.3000mm 0.4000mm "clearline"]
	Line[2.2500mm 8.6500mm 2.6000mm 8.3000mm 0.3000mm 0.4000mm "clearline"]
	Line[2.6000mm 8.3000mm 3.9000mm 8.3000mm 0.3000mm 0.4000mm "clearline"]
	Line[3.5500mm 9.2000mm 3.9500mm 9.6000mm 0.3000mm 0.4000mm "clearline"]
	Line[3.9500mm 9.6000mm 4.0000mm 9.6000mm 0.3000mm 0.4000mm "clearline"]
	Line[9.3000mm 0.2000mm 7.1000mm 2.4000mm 0.3000mm 0.4000mm "clearline"]
	Line[5.9500mm 11.3000mm 3.6000mm 11.3000mm 0.3000mm 0.4000mm "clearline"]
	Line[7.1000mm 2.4000mm 6.1000mm 2.4000mm 0.3000mm 0.4000mm "clearline"]
	Line[3.9000mm 8.3000mm 4.8000mm 9.2000mm 0.3000mm 0.4000mm "clearline"]
)
Layer(2 "ground" "copper")
(
)
Layer(3 "power" "copper")
(
)
Layer(4 "bottom" "copper")
(
)
Layer(5 "outline" "outline")
(
)
Layer(6 "diff" "copper")
(
)
Layer(7 "top_gnd" "copper")
(
	Polygon("clearpoly")
	(
		[0.9000mm 1.3000mm] [9.7000mm 1.3000mm] [9.7000mm 11.9000mm] [0.9000mm 11.9000mm] 
	)
)
Layer(8 "bottom_gnd" "copper")
(
)
Layer(9 "bottom silk" "silk")
(
)
Layer(10 "top silk" "silk")
(
	Line[6.6000mm 11.0000mm 6.6000mm 11.0000mm 0.2000mm 0.4000mm "clearline,lock"]
	Line[6.7000mm 11.2000mm 6.7000mm 11.2000mm 0.2000mm 0.4000mm "clearline,lock"]
)

--sHrvAb52M6C8blB9--
- Raw text -
webmaster	delorie software privacy
Copyright � 2019 by DJ Delorie	Updated Jul 2019
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X-Recipient:	geda-user AT delorie DOT com
Date:	Tue, 22 Dec 2015 15:47:20 +0100
From:	Martin Beranek <martin AT mb5 DOT cz>
To:	geda-user AT delorie DOT com
Subject:	[geda-user] Self-intersecting polygon appears because of intersection
	coordinates rounding
Message-ID:	<20151222144719.GN14853@abax>
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