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87 lines
2.8 KiB
Python
87 lines
2.8 KiB
Python
from math import sin, cos, pi
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from build123d import *
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# Canadian Flags have a 2:1 aspect ratio
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height = 50
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width = 2 * height
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wave_amplitude = 3
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def surface(amplitude, u, v):
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"""Calculate the surface displacement of the flag at a given position"""
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return v * amplitude / 20 * cos(3.5 * pi * u) + amplitude / 10 * v * sin(
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1.1 * pi * v
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)
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# Note that the surface to project on must be a little larger than the faces
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# being projected onto it to create valid projected faces
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the_wind = Face.make_surface_from_array_of_points(
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[
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[
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Vector(
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width * (v * 1.1 / 40 - 0.05),
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height * (u * 1.2 / 40 - 0.1),
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height * surface(wave_amplitude, u / 40, v / 40) / 2,
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)
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for u in range(41)
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]
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for v in range(41)
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]
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)
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field_planar = Plane.XY.offset(10) * Rectangle(width / 4, height, align=Align.MIN)
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west_field_planar = field_planar.faces()[0]
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east_field_planar = mirror(west_field_planar, Plane.YZ.offset(width / 2))
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l1 = Polyline((0.0000, 0.0771), (0.0187, 0.0771), (0.0094, 0.2569))
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l2 = Polyline((0.0325, 0.2773), (0.2115, 0.2458), (0.1873, 0.3125))
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r1 = RadiusArc(l1 @ 1, l2 @ 0, 0.0271)
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l3 = Polyline((0.1915, 0.3277), (0.3875, 0.4865), (0.3433, 0.5071))
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r2 = TangentArc(l2 @ 1, l3 @ 0, tangent=l2 % 1)
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l4 = Polyline((0.3362, 0.5235), (0.375, 0.6427), (0.2621, 0.6188))
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r3 = SagittaArc(l3 @ 1, l4 @ 0, 0.003)
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l5 = Polyline((0.2469, 0.6267), (0.225, 0.6781), (0.1369, 0.5835))
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r4 = ThreePointArc(l4 @ 1, (l4 @ 1 + l5 @ 0) * 0.5 + Vector(-0.002, -0.002), l5 @ 0)
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l6 = Polyline((0.1138, 0.5954), (0.1562, 0.8146), (0.0881, 0.7752))
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s = Spline(
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l5 @ 1,
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l6 @ 0,
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tangents=(l5 % 1, l6 % 0),
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tangent_scalars=(2, 2),
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)
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l7 = Line((0.0692, 0.7808), (0.0000, 0.9167))
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r5 = TangentArc(l6 @ 1, l7 @ 0, tangent=l6 % 1)
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outline = l1 + [l2, r1, l3, r2, l4, r3, l5, r4, l6, s, l7, r5]
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outline += mirror(outline, Plane.YZ)
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maple_leaf_planar = make_face(outline)
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center_field_planar = (
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Rectangle(1, 1, align=(Align.CENTER, Align.MIN)) - maple_leaf_planar
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)
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def scale_move(obj):
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return Plane((width / 2, 0, 10)) * scale(obj, height)
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def project(obj):
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return obj.faces()[0].project_to_shape(the_wind, (0, 0, -1))[0]
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maple_leaf_planar = scale_move(maple_leaf_planar)
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center_field_planar = scale_move(center_field_planar)
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west_field = project(west_field_planar)
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east_field = project(east_field_planar)
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center_field = project(center_field_planar)
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maple_leaf = project(maple_leaf_planar)
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if "show_object" in locals():
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show_object(west_field, name="west", options={"color": (255, 0, 0)})
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show_object(east_field, name="east", options={"color": (255, 0, 0)})
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show_object(center_field, name="center", options={"color": (255, 255, 255)})
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show_object(maple_leaf, name="maple", options={"color": (255, 0, 0)})
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