From 61e591b5b811438ff36e4347f94c6c89f222b7b7 Mon Sep 17 00:00:00 2001 From: jaseg Date: Fri, 22 Sep 2023 18:50:58 +0200 Subject: WiP --- test2.py | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 test2.py (limited to 'test2.py') diff --git a/test2.py b/test2.py new file mode 100644 index 0000000..72626db --- /dev/null +++ b/test2.py @@ -0,0 +1,53 @@ +from gerbonara import * +from shapely import * + +stack = layers.LayerStack.open('/home/jaseg/proj/ihsm-strain-gage-controller-hw/pcb/gerber') +# Let's work in mm here. Gerbonara will take care to convert units when the file is in US customary units. +(x1, y1), (x2, y2) = stack.bounding_box(unit=utils.MM) + +for l in [stack['bottom mask'], stack['top mask']]: + + # The solder mask gerber layer by convention is "negative". That is, a "dark" polarity (drawn) Gerber primitive + # will result in an opening in the solder mask. Conversely, an empty gerber file would lead to the entire board + # being covered in solder mask. + # + # Here, we add a rectangle covering the entire board so the entire board is *free* of solder mask. + + new = [graphic_objects.Region( + [(x1, y1), (x1, y2), (x2, y2), (x2, y1), (x1, y1)], + unit=utils.MM, + polarity_dark=True)] + + # Iterate through all objects on the solder mask layer. In later KiCad versions, everything on the solder mask + # layer is exported as a Gerber region, which is a really bad idea, but makes things easy for us here. + for obj in l.objects: + if not obj.polarity_dark: + continue + + if isinstance(obj, graphic_objects.Region): + regions = [] + else: + regions = [graphic_objects.Region.from_arc_poly(prim.to_arc_poly()) + for prim in obj.to_primitives(unit=utils.MM)] + + for obj in regions: + # Convert the region to a shapely line string + ls = LineString(obj.outline).normalize() + + # Ask shapely to offset the line string by 1 mm + out = ls.offset_curve(obj.unit(1, 'mm')) + + # For negative offsets, this operation can result in an object being split up into multiple parts, so we + # might get back a MultiLineString instead of a LineString. + for ls in (out.geoms if hasattr(out, 'geoms') else [out]): + + # Convert the resulting shapely object back to a Gerber region. + new.append(graphic_objects.Region( + unit=obj.unit, + polarity_dark=not obj.polarity_dark, + outline=list(ls.coords))) + + # Append the new objects to the original layer data + l.objects = new + l.objects +# Write the modified layer stack to a new Gerber directory +stack.save_to_directory('/tmp/out') -- cgit