Added clock & loft examples, refactored sketch polar

examples/loft.py

@@ -0,0 +1,43 @@
+"""
+
+name: loft.py
+by:   Gumyr
+date: July 15th 2022
+
+desc:
+
+    This example demonstrates lofting a set of sketches, selecting
+    the top and bottom by type, and shelling.
+
+license:
+
+    Copyright 2022 Gumyr
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+"""
+from build123d.build123d_common import *
+from build123d.build_sketch import *
+from build123d.build_part import *
+
+with BuildPart() as art:
+    slice_count = 10
+    for i in range(slice_count + 1):
+        Workplanes(Plane(origin=(0, 0, i * 3), normal=(0, 0, 1)))
+        with BuildSketch() as slice:
+            Circle(10 * sin(i * pi / slice_count) + 5)
+    Loft()
+    top_bottom = art.faces().filter_by_type(Type.PLANE)
+    Shell(*top_bottom, thickness=0.5)
+
+if "show_object" in locals():
+    show_object(art.part, name="art")