more work on transitions for MEP

- support transitions from and to circle profiles
- reworked transition length algorithm now it should be more accurate
- added support for creating transitions between profiles that are parallel but not collinear

src/blenderbim/test/tool/test_cad.py

@@ -0,0 +1,58 @@
+# BlenderBIM Add-on - OpenBIM Blender Add-on
+# Copyright (C) 2023 Dion Moult <dion@thinkmoult.com>, @Andrej730
+#
+# This file is part of BlenderBIM Add-on.
+#
+# BlenderBIM Add-on is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# BlenderBIM Add-on is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with BlenderBIM Add-on.  If not, see <http://www.gnu.org/licenses/>.
+
+from test.bim.bootstrap import NewFile
+from blenderbim.tool.cad import Cad as subject
+from mathutils import Vector
+
+V = lambda *x: Vector([float(i) for i in x])
+
+
+class TestAreEdgesCollinear(NewFile):
+    def test_run(self):
+        # fmt: off
+        # Parallel edges but not collinear (different z-coordinates)
+        assert not subject.are_edges_collinear(
+            (V(-1,0,-1), V(1,0,-1)), 
+            (V(-1,0,1), V(1,0,1))
+        )
+        
+        # One edge is just a point and the other is a line segment.
+        assert not subject.are_edges_collinear(
+            (V(1,-1,0), V(1,-1,0)), 
+            (V(-1,1,0), V(1,1,0))
+        )
+        
+        # Both edges are collinear and overlap.
+        assert subject.are_edges_collinear(
+            (V(0,0,0), V(2,2,2)),
+            (V(1,1,1), V(3,3,3))
+        )
+
+        # Both edges are collinear but don't overlap.
+        assert subject.are_edges_collinear(
+            (V(0,0,0), V(1,1,1)),
+            (V(2,2,2), V(3,3,3))
+        )
+        
+        # Edges are not parallel and not collinear.
+        assert not subject.are_edges_collinear(
+            (V(0,0,0), V(1,1,1)),
+            (V(0,1,0), V(1,0,1))
+        )
+        # fmt: on