kopia lustrzana https://gitlab.com/gerbolyze/gerbonara
54 wiersze
2.3 KiB
Python
54 wiersze
2.3 KiB
Python
from gerbonara import *
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from shapely import *
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stack = layers.LayerStack.open('/home/jaseg/proj/ihsm-strain-gage-controller-hw/pcb/gerber')
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# Let's work in mm here. Gerbonara will take care to convert units when the file is in US customary units.
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(x1, y1), (x2, y2) = stack.bounding_box(unit=utils.MM)
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for l in [stack['bottom mask'], stack['top mask']]:
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# The solder mask gerber layer by convention is "negative". That is, a "dark" polarity (drawn) Gerber primitive
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# will result in an opening in the solder mask. Conversely, an empty gerber file would lead to the entire board
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# being covered in solder mask.
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#
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# Here, we add a rectangle covering the entire board so the entire board is *free* of solder mask.
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new = [graphic_objects.Region(
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[(x1, y1), (x1, y2), (x2, y2), (x2, y1), (x1, y1)],
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unit=utils.MM,
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polarity_dark=True)]
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# Iterate through all objects on the solder mask layer. In later KiCad versions, everything on the solder mask
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# layer is exported as a Gerber region, which is a really bad idea, but makes things easy for us here.
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for obj in l.objects:
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if not obj.polarity_dark:
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continue
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if isinstance(obj, graphic_objects.Region):
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regions = []
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else:
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regions = [graphic_objects.Region.from_arc_poly(prim.to_arc_poly())
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for prim in obj.to_primitives(unit=utils.MM)]
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for obj in regions:
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# Convert the region to a shapely line string
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ls = LineString(obj.outline).normalize()
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# Ask shapely to offset the line string by 1 mm
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out = ls.offset_curve(obj.unit(1, 'mm'))
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# For negative offsets, this operation can result in an object being split up into multiple parts, so we
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# might get back a MultiLineString instead of a LineString.
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for ls in (out.geoms if hasattr(out, 'geoms') else [out]):
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# Convert the resulting shapely object back to a Gerber region.
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new.append(graphic_objects.Region(
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unit=obj.unit,
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polarity_dark=not obj.polarity_dark,
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outline=list(ls.coords)))
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# Append the new objects to the original layer data
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l.objects = new + l.objects
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# Write the modified layer stack to a new Gerber directory
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stack.save_to_directory('/tmp/out')
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