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Subject: Re: [geda-user] New router pictures/ polygon bug
From: Stefan Salewski <mail AT ssalewski DOT de>
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Date: Tue, 14 Jan 2014 18:32:20 +0100
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On Tue, 2014-01-14 at 08:42 +0100, Gabriel Paubert wrote:
> It's certainly not related to the GL drawing, I also see it with the
> lesstif interface. I believe that this is a polygon dicer bug, and
> that 
> the nm conversion has nothing to do with it.

I have again tested with pcb version 20110918 by inserting
following lines with an texteditor in a pcb board file fresh created by
pcb program:

Element["" "R0603" "R1" "" 4.0000mm 13.2500mm -0.7100mm 2.6350mm 1 100 ""]
(
  Pad[-0.1500mm 0.7500mm 0.1500mm 0.7500mm 0.6000mm 0.4000mm 0.7500mm "" "1" "square"]
  Pad[-0.1500mm -0.7500mm 0.1500mm -0.7500mm 0.6000mm 0.4000mm 0.7500mm "" "2" "square"]
  )

Layer(1 "component")
(
  Line[2.0000mm 12.5000mm 4.0000mm 12.5000mm 0.2000mm 0.4000mm "clearline"]
  Polygon("clearpoly")
  (
    [0.7500mm 7.0000mm] [22.0000mm 7.0000mm] [22.0000mm 18.0000mm] [0.7500mm 18.0000mm] 
  )
)

The bug is visible in the gerber files also.
Then I converted mm unit to default 0.01mil unit with this vim command:

:%s@\(\d\+\.\?\d\+\)mm@\=printf('%.0f',(str2float(submatch(1))*1.0e6/254.0))@g

And the bug disappeared, also in the gerbers.
Maybe it is not directly related to the conversion to nm as internal PCB units,
but to rounding?