Adding a BuildSketch Shamrock example

examples/shamrock.py

@@ -0,0 +1,53 @@
+from build123d import *
+
+
+class Shamrock(BaseSketchObject):
+    """Sketch Object: Shamrock
+
+    Adds a four leaf clover
+
+    Args:
+        height (float): y axis dimension
+        rotation (float, optional): angle in degrees. Defaults to 0.
+        align (tuple[Align, Align], optional): alignment. Defaults to (Align.CENTER, Align.CENTER).
+        mode (Mode, optional): combination mode. Defaults to Mode.ADD.
+    """
+
+    def __init__(
+        self,
+        height: float,
+        rotation: float = 0,
+        align: tuple[Align, Align] = (Align.CENTER, Align.CENTER),
+        mode: Mode = Mode.ADD,
+    ):
+        with BuildSketch() as shamrock:
+            with BuildLine():
+                b0 = Bezier((240, 310), (112, 325), (162, 438), (252, 470))
+                b1 = Bezier(b0 @ 1, (136, 431), (73, 589), (179, 643))
+                b2 = Bezier(b1 @ 1, (151, 747), (293, 770), (360, 679))
+                b3 = Bezier(b2 @ 1, (358, 736), (366, 789), (392, 840))
+                l0 = Line(b3 @ 1, (407, 834))
+                b4 = Bezier(l0 @ 1, (366, 781), (374, 670), (374, 670))
+                b5 = Bezier(b4 @ 1, (373, 794), (506, 789), (528, 727))
+                b6 = Bezier(b5 @ 1, (636, 733), (638, 578), (507, 541))
+                b7 = Bezier(b6 @ 1, (628, 559), (651, 380), (575, 365))
+                b8 = Bezier(b7 @ 1, (592, 269), (420, 268), (417, 361))
+                b9 = Bezier(b8 @ 1, (410, 253), (262, 222), b0 @ 0)
+                Mirror(about=Plane.XZ, mode=Mode.REPLACE)
+            MakeFace()
+            Scale(by=height / shamrock.sketch.bounding_box().size.Y)
+        super().__init__(
+            obj=shamrock.sketch.translate(
+                -shamrock.sketch.center(CenterOf.BOUNDING_BOX)
+            ),
+            rotation=rotation,
+            align=align,
+            mode=mode,
+        )
+
+
+if __name__ == "__main__" or "show_object" in locals():
+    shamrock = Shamrock(10)
+
+    if "show_object" in locals():
+        show_object(shamrock)