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Updating to use ExportSVG
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4 changed files with 71 additions and 402 deletions
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docs/assets/one_d_center.svg
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docs/assets/one_d_center.svg
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<?xml version='1.0' encoding='utf-8'?>
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<svg width="60.09mm" height="60.09mm" viewBox="-5.045 -55.045 60.09 60.09" version="1.1" xmlns="http://www.w3.org/2000/svg">
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<g transform="scale(1,-1)" stroke-linecap="round">
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<g fill="none" stroke="rgb(0,0,0)" stroke-width="0.09">
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<path d="M -0.0,0.0 A 50.00000000000001,50.00000000000001 90.0 0,1 50.0,50.0" />
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<path d="M 23.0,27.0 L 23.0,23.0 L 27.0,23.0 L 27.0,27.0 L 23.0,27.0" />
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<circle cx="31.830989" cy="18.169011" r="2.0" />
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<path d="M 37.355339,14.644661 L 34.355339,16.376712 L 34.355339,12.91261 L 37.355339,14.644661" />
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</g>
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<g fill="none" stroke="rgb(0,0,0)" stroke-width="0.09" id="bbox" stroke-dasharray="1.143 0.5715">
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<path d="M 0.0,0.0 L 50.0,0.0 L 50.0,50.0 L 0.0,50.0 L 0.0,0.0" />
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</g>
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</g>
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</svg>
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@ -1,72 +1,35 @@
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from build123d import *
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from build123d import *
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from ocp_vscode import *
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svg_opts = {"pixel_scale": 2, "show_axes": False, "show_hidden": False}
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size = 50
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#
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# Symbols
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#
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bbox_symbol = Rectangle(4, 4)
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geom_symbol = RegularPolygon(2, 3)
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mass_symbol = Circle(2)
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line_width = 2
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#
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with BuildSketch() as isosceles_triangle:
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# 2D Center Options
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# Make Bounding Box frame
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#
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with BuildLine():
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triangle = RegularPolygon(size / 1.866, 3, rotation=90)
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Polyline((-100, 0), (100, 0), (100, 200), (-100, 200), close=True)
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svg = ExportSVG(margin=5)
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offset(amount=line_width)
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svg.add_layer("bbox", line_type=LineType.DASHED)
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make_face()
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svg.add_shape(bounding_box(triangle), "bbox")
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Rectangle(200, 200, align=(Align.CENTER, Align.MIN), mode=Mode.SUBTRACT)
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svg.add_shape(triangle)
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# Make triangle
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svg.add_shape(bbox_symbol.located(Location(triangle.center(CenterOf.BOUNDING_BOX))))
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with BuildLine():
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svg.add_shape(mass_symbol.located(Location(triangle.center(CenterOf.MASS))))
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Polyline((-100, 0), (100, 0), (0, 200), close=True)
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svg.write("assets/center.svg")
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triangle = make_face()
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triangle_face: Face = triangle.faces()[0]
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center_of_bbox = triangle_face.center(CenterOf.BOUNDING_BOX)
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center_of_geom = triangle_face.center(CenterOf.GEOMETRY)
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center_of_mass = triangle_face.center(CenterOf.MASS)
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with Locations(center_of_bbox):
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Circle(line_width, mode=Mode.SUBTRACT)
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with Locations(center_of_geom):
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RegularPolygon(line_width, 4, mode=Mode.SUBTRACT)
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with Locations(center_of_bbox + Vector(line_width, line_width)):
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Text(
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"center of\nbounding\nbox",
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# font="FreeSerif",
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font_size=3 * line_width,
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align=Align.MIN,
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mode=Mode.SUBTRACT,
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)
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with Locations(center_of_geom + Vector(line_width, line_width)):
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Text(
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"center of\ngeometry",
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# font="FreeSerif",
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font_size=3 * line_width,
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align=Align.MIN,
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mode=Mode.SUBTRACT,
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)
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isosceles_triangle.sketch.export_svg(
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#
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"assets/center.svg", (0, 0, 100), (0, 1, 0), svg_opts=svg_opts
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# 1D Center Options
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)
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#
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line = TangentArc((0, 0), (size, size), tangent=(1, 0))
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svg = ExportSVG(margin=5)
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line = Edge.make_tangent_arc((0, 0), (100, 0), (100, 100))
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svg.add_layer("bbox", line_type=LineType.DASHED)
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line_center_geom = Location(line.center(CenterOf.GEOMETRY)) * RegularPolygon(
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line_width, 4
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)
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line_center_bbox = Location(line.center(CenterOf.BOUNDING_BOX)) * Circle(line_width)
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line_center_mass = Location(line.center(CenterOf.MASS)) * RegularPolygon(line_width, 3)
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# one_d_diagram = Compound().make_compound(
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# # [line, line_center_bbox, line_center_geom, line_center_mass]
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# [line_center_bbox, line_center_geom, line_center_mass]
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# )
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# svg = ExportSVG(margin=5, line_weight=0.13)
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svg = ExportSVG(margin=5, line_weight=0.1)
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svg.add_shape(line)
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svg.add_shape(line)
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svg.add_shape(line_center_geom)
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svg.add_shape(Polyline((0, 0), (size, 0), (size, size), (0, size), (0, 0)), "bbox")
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svg.add_shape(line_center_bbox)
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svg.add_shape(bbox_symbol.located(Location(line.center(CenterOf.BOUNDING_BOX))))
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svg.add_shape(line_center_mass)
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svg.add_shape(mass_symbol.located(Location(line.center(CenterOf.MASS))))
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svg.add_shape(geom_symbol.located(Location(line.center(CenterOf.GEOMETRY))))
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# svg.add_layer("hidden", color=ColorIndex.LIGHT_GRAY, line_weight=0.09, line_type=LineType.ISO_DASH_SPACE)
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# svg.add_shape(dwg.hidden_lines, layer="hidden")
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svg.write("assets/one_d_center.svg")
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svg.write("assets/one_d_center.svg")
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# one_d_diagram.export_svg(
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# "assets/one_d_center.svg", (0, 0, 100), (0, 1, 0), svg_opts=svg_opts
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# )
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# show_object(one_d_diagram)
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show_object(isosceles_triangle.sketch)
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@ -3,24 +3,24 @@ CAD Object Centers
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##################
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##################
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Finding the center of a CAD object is a surprisingly complex operation. To illustrate
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Finding the center of a CAD object is a surprisingly complex operation. To illustrate
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let's consider a simple isosceles triangle enclosed in its bounding box:
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let's consider two examples: a simple isosceles triangle and a curved line (their bounding
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boxes are shown with dashed lines):
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.. image:: assets/center.svg
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.. image:: assets/center.svg
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:align: center
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:width: 49%
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One can see that there is a significant difference between the centers of its geometry and
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.. image:: assets/one_d_center.svg
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that of its bounding box.
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:width: 49%
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To allow the designer to choose the center that makes the most sense for the given
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One can see that there is are significant differences between the different types of
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centers. To allow the designer to choose the center that makes the most sense for the given
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shape there are three possible values for the :class:`~build_enums.CenterOf` Enum:
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shape there are three possible values for the :class:`~build_enums.CenterOf` Enum:
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+--------------------------------+----+----+----+----------+
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============================== ====== == == == ========
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| :class:`~build_enums.CenterOf` | 1D | 2D | 3D | Compound |
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:class:`~build_enums.CenterOf` Symbol 1D 2D 3D Compound
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+================================+====+====+====+==========+
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============================== ====== == == == ========
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| CenterOf.BOUNDING_BOX | ✓ | ✓ | ✓ | ✓ |
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CenterOf.BOUNDING_BOX □ ✓ ✓ ✓ ✓
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+--------------------------------+----+----+----+----------+
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CenterOf.GEOMETRY △ ✓ ✓
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| CenterOf.GEOMETRY | ✓ | ✓ | | |
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CenterOf.MASS ○ ✓ ✓ ✓ ✓
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+--------------------------------+----+----+----+----------+
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============================== ====== == == == ========
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| CenterOf.MASS | ✓ | ✓ | ✓ | ✓ |
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+--------------------------------+----+----+----+----------+
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