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	Sat, 21 Mar 2015 15:19:50 -0700 (PDT)
Date:	Sat, 21 Mar 2015 18:19:50 -0400
Message-ID:	<CAOFvGD7aLirsi6WLAgSLZinM4FUHVBYm+_KTUnj9KeLm_i_1Bw@mail.gmail.com>
Subject:	[geda-user] A Python Gerber writer
From:	Jason White <whitewaterssoftwareinfo AT gmail DOT com>
To:	geda-user AT delorie DOT com
Reply-To:	geda-user AT delorie DOT com

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Hello, today I spent a while toying around with the idea of creating a
gerber writer in python. This is in order to facilitate the goal of
creating multilayer PCBs with buried vias.

I succeeded in making a usable, but unpolished, gerber writer.


It takes primitives (instances of classes) such as text, lines,
circles, and polygons and writes them out using the standard gerber
RS-274X format.

Check out the attached code, screenshot, and gerber files!

Here is the example code used to generate export2.gbr: (note, the
actual code uses micrometers as units for coordinates, I replaced them
with the equivalent mm values for readability)

writer=gerber_writer("export2.gbr")

writer.primitives=[
line(1, 1, 2, 2, "C", 0, "copper", thickness=0.25, clearance=None),
line(1, 2, 2, 3, "R", 0, "copper", thickness=0.5, clearance=None),
line(1, 3.5, 2, 3.5, "C", 0, "copper", thickness=0.25, clearance=None),

line(1, 4, 2, 4, "R", 0, "copper", thickness=0.25, clearance=None),
line(2.5, 1, 2.5, 1, "R", 0, "copper", thickness=1, clearance=None),

circle(0, 0, 1, 0, "copper", thickness=0.5, clearance=None),
circle(0, 2, 1, 0, "copper", thickness=0.5, clearance=None),
circle(3.5, 3, 1, 0, "copper", thickness=1.25, clearance=None),


polygon(1, 0, 1, [[3,0], [4,0], [4,1.5],  [2.5,1.5], [3,1]], 0,
"copper", thickness=0.0, clearance=None),
text(0, -1.5, "Hello!", 1, 0, 0, "copper", thickness=0.15, clearance=None),

text(-5, 0, "Any Angle Text", 0.25, 45, 0, "copper", thickness=0.04,
clearance=None)
]

writer.write()



With a bit more polish and another layer of abstraction to handle
groups and layers, this will easily be capable of generating the
Gerbers for an entire (hard-coded) board.


Mail server rejected the zip file with the source code, so ....
You can download the sources and the gerbers here (glif.zip, 9.1K):
https://drive.google.com/file/d/0BwP0qhqyaTIIeUV1YVo3MDNpbHM/view?usp=sharing


-- 
Jason White

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Content-Type: image/png; name="gerber.png"
Content-Disposition: attachment; filename="gerber.png"
Content-Transfer-Encoding: base64
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