SlotOverall, SlotCenterToCenter: (re)implement and test circle degenerate case

Author: jwagenet

src/build123d/objects_sketch.py

@@ -464,7 +464,7 @@ def __init__(
         rotation: float = 0,
         mode: Mode = Mode.ADD,
     ):
-        if center_separation <= 0:
+        if center_separation < 0:
             raise ValueError(
                 f"Requires center_separation > 0. Got: {center_separation=}"
             )
@@ -475,14 +475,18 @@ def __init__(
         self.center_separation = center_separation
         self.slot_height = height
 
-        face = Face(
-            Wire(
-                [
-                    Edge.make_line(Vector(-center_separation / 2, 0, 0), Vector()),
-                    Edge.make_line(Vector(), Vector(+center_separation / 2, 0, 0)),
-                ]
-            ).offset_2d(height / 2)
-        )
+        if center_separation > 0:
+            face = Face(
+                Wire(
+                    [
+                        Edge.make_line(Vector(-center_separation / 2, 0, 0), Vector()),
+                        Edge.make_line(Vector(), Vector(+center_separation / 2, 0, 0)),
+                    ]
+                ).offset_2d(height / 2)
+            )
+        else:
+            face = cast(Face, Circle(height / 2, mode=mode).face())
+
         super().__init__(face, rotation, None, mode)
 
 
@@ -510,7 +514,7 @@ def __init__(
         align: Align | tuple[Align, Align] | None = (Align.CENTER, Align.CENTER),
         mode: Mode = Mode.ADD,
     ):
-        if width <= height:
+        if width < height:
             raise ValueError(
                 f"Slot requires that width > height. Got: {width=}, {height=}"
             )
@@ -521,7 +525,7 @@ def __init__(
         self.width = width
         self.slot_height = height
 
-        if width != height:
+        if width > height:
             face = Face(
                 Wire(
                     [
@@ -532,6 +536,7 @@ def __init__(
             )
         else:
             face = cast(Face, Circle(width / 2, mode=mode).face())
+
         super().__init__(face, rotation, align, mode)
 
 

tests/test_build_sketch.py

@@ -328,25 +328,40 @@ def test_slot_center_point(self):
         self.assertEqual(s.faces()[0].normal_at(), Vector(0, 0, 1))
 
     def test_slot_center_to_center(self):
+        height = 2
         with BuildSketch() as test:
-            s = SlotCenterToCenter(4, 2)
+            s = SlotCenterToCenter(4, height)
         self.assertEqual(s.center_separation, 4)
-        self.assertEqual(s.slot_height, 2)
+        self.assertEqual(s.slot_height, height)
         self.assertEqual(s.rotation, 0)
         self.assertEqual(s.mode, Mode.ADD)
-        self.assertAlmostEqual(test.sketch.area, pi + 4 * 2, 5)
+        self.assertAlmostEqual(test.sketch.area, pi + 4 * height, 5)
         self.assertEqual(s.faces()[0].normal_at(), Vector(0, 0, 1))
 
+        # Circle degenerate
+        s1 = SlotCenterToCenter(0, height)
+        self.assertTrue(len(s1.edges()) == 1)
+        self.assertEqual(s1.edge().geom_type, GeomType.CIRCLE)
+        self.assertAlmostEqual(s1.edge().radius, height / 2)
+
+
     def test_slot_overall(self):
+        height = 2
         with BuildSketch() as test:
-            s = SlotOverall(6, 2)
+            s = SlotOverall(6, height)
         self.assertEqual(s.width, 6)
-        self.assertEqual(s.slot_height, 2)
+        self.assertEqual(s.slot_height, height)
         self.assertEqual(s.rotation, 0)
         self.assertEqual(s.mode, Mode.ADD)
-        self.assertAlmostEqual(test.sketch.area, pi + 4 * 2, 5)
+        self.assertAlmostEqual(test.sketch.area, pi + 4 * height, 5)
         self.assertEqual(s.faces()[0].normal_at(), Vector(0, 0, 1))
 
+        # Circle degenerat
+        s1 = SlotOverall(2, height)
+        self.assertTrue(len(s1.edges()) == 1)
+        self.assertEqual(s1.edge().geom_type, GeomType.CIRCLE)
+        self.assertAlmostEqual(s1.edge().radius, height / 2)
+
     def test_text(self):
         with BuildSketch() as test:
             t = Text("test", 2)
@@ -530,7 +545,7 @@ def test_full_round(self):
 @pytest.mark.parametrize(
     "slot,args",
     [
-        (SlotOverall, (5, 10)),
+        (SlotOverall, (9, 10)),
         (SlotCenterToCenter, (-1, 10)),
         (SlotCenterPoint, ((0, 0, 0), (0, 0, 0), 10)),
     ],