76 lines
2.0 KiB
Python
76 lines
2.0 KiB
Python
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from math import *
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from shapely import geometry, ops
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import axi
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W = 6
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H = 8
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BOUNDS = (0, 0, W, H)
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BIT_RADIUS = 0.125
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def regular_polygon(n, x, y, r):
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points = []
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for i in range(n):
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t = 2 * pi / n * i
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points.append((x + r * cos(t), y + r * sin(t)))
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points.append(points[0])
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return points
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def polygon_splits(n, x, y, r, b):
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lines = []
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for i in range(n):
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t = 2 * pi / n * (i + 0.5)
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lines.append([(x, y), (x + r * cos(t), y + r * sin(t))])
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return geometry.MultiLineString(lines).buffer(b)
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def polygon(n, r, br, notch=False):
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p = regular_polygon(n, 0, 0, r)
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g = geometry.Polygon(p)
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g = g.buffer(br).exterior
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if notch:
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g = g.difference(polygon_splits(n, 0, 0, r * 2, br * 2))
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g = ops.linemerge(g)
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p = axi.shapely_to_paths(g)
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return axi.Drawing(p).origin()
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def drawings_to_gcode(ds, zs, z0, f):
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lines = []
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lines.append('G90') # absolute coordinates
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lines.append('G20') # inches
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lines.append('G0 Z%g' % z0) # jog to z0
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lines.append('M4') # turn on router
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lines.append('G4 P2.0') # dwell for N seconds
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lines.append('F%g' % f) # set feed rate (inches per minute)
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for d, z in zip(ds, zs):
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for path in d.paths:
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# jog to first point
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x, y = path[0]
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lines.append('G0 X%g Y%g' % (x, y))
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# move z down
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lines.append('G1 Z%g' % z)
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# draw path
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for x, y in path[1:]:
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lines.append('G1 X%g Y%g' % (x, y))
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# move z up
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lines.append('G1 Z%g' % z0)
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lines.append('M8')
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lines.append('G0 X0 Y0')
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return '\n'.join(lines)
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def main():
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d0 = polygon(3, 3 / sqrt(3), BIT_RADIUS, False)
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d1 = polygon(3, 3 / sqrt(3), BIT_RADIUS, True)
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ds = [d0, d0, d1]
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ds = [d.translate(1, 1) for d in ds]
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zs = [-0.25, -0.5, -0.75]
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g = drawings_to_gcode(ds, zs, 0.5, 30)
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print(g)
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for i, (d, z) in enumerate(zip(ds, zs)):
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d.render(bounds=BOUNDS).write_to_png('z%g.png' % z)
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if __name__ == '__main__':
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main()
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