Matthias,
Yes, I think your interpretation looks correct. Let me do a little
more research tonight into this and double check. If it's correct, I'll
fix the gerbv code to correct this item. Thanks for pointing this out.
Cheers--
Julian
On 01/09/2012 05:30 PM, matth...@koefferlein.de wrote:
Hallo,
I'd like to discuss a technical matter about the RS274X format and I
hope sending a message to this mailing list is a good way to do so. If
now, please let me know or forward the message to somebody involved in
that topic.
I am the author of KLayout which is an open source IC layout viewer
and editor but also offers a Gerber import feature. Stefan Thiede is
challenging me from time to time with test cases and since this is the
second time this one popped up, I'd like to discuss the matter of
interpretation of that particular test case (please see the file
attached).
I am referring to the moire pattern in the right column (the bottom
pattern). gerbv shows two concentric circles with the inner one having
roughly half the diameter than the outer one. When I look at the
definition of that moire pattern here
%AMMOIRE*
6,0,0,1.0,0.1,0.4,2,0.01,1,40*
%
my interpretation differs from that. The RS274X spec I have says this
is a moire pattern with two circles, the outer having a diameter of
1.0, the thickness of the circles being 0.1 and the gap between the
circles being 0.4.
Since the width and the gap reduces the radius, not the diameter, the
inner circle should have a outside radius of
0.5 /*radius outer circle*/ - 0.1 /*width of outer circle*/ - 0.4
/*gap*/ = 0!
So I'd say the inner circle should basically disappear. I have checked
against an online viewer (http://www.gerber-viewer.com) which also
shows just the outer circle.
To me that looks like a gerbv bug, but I am not an expert on the
interpretation of the RS274X format.
Any ideas?
Best regards,
Matthias
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