OpenSCAD's polygon() takes a convexity argument. Add that argument and a test for it to SP

Author: etjones

solid/objects.py

@@ -36,18 +36,20 @@ class polygon(OpenSCADObject):
     assumed in order. (The 'pN' components of the *paths* vector are 0-indexed 
     references to the elements of the *points* vector.)
 
+    :param convexity: OpenSCAD's convexity... yadda yadda
+
     NOTE: OpenSCAD accepts only 2D points for `polygon()`. Convert any 3D points
     to 2D before compiling
     """
 
-    def __init__(self, points: Union[Points, IncludedOpenSCADObject], paths: Indexes = None) -> None:
+    def __init__(self, points: Union[Points, IncludedOpenSCADObject], paths: Indexes = None, convexity: int = None) -> None:
         # Force points to 2D if they're defined in Python, pass through if they're
         # included OpenSCAD code
         pts = points # type: ignore
         if not isinstance(points, IncludedOpenSCADObject):
             pts = list([(p[0], p[1]) for p in points]) # type: ignore
 
-        args = {'points':pts}
+        args = {'points':pts, 'convexity':convexity}
         # If not supplied, OpenSCAD assumes all points in order for paths
         if paths:
             args['paths'] = paths # type: ignore

solid/test/test_solidpython.py

@@ -18,6 +18,7 @@
 scad_test_case_templates = [
     {'name': 'polygon', 'class': 'polygon' , 'kwargs': {'paths': [[0, 1, 2]]}, 'expected': '\n\npolygon(paths = [[0, 1, 2]], points = [[0, 0], [1, 0], [0, 1]]);', 'args': {'points': [[0, 0, 0], [1, 0, 0], [0, 1, 0]]}, },
     {'name': 'polygon', 'class': 'polygon' , 'kwargs': {}, 'expected': '\n\npolygon(points = [[0, 0], [1, 0], [0, 1]]);', 'args': {'points': [[0, 0, 0], [1, 0, 0], [0, 1, 0]]}, },
+    {'name': 'polygon', 'class': 'polygon' , 'kwargs': {}, 'expected': '\n\npolygon(convexity = 3, points = [[0, 0], [1, 0], [0, 1]]);', 'args': {'points': [[0, 0, 0], [1, 0, 0], [0, 1, 0]], 'convexity': 3}, },
     {'name': 'circle', 'class': 'circle' , 'kwargs': {'segments': 12, 'r': 1}, 'expected': '\n\ncircle($fn = 12, r = 1);', 'args': {}, },
     {'name': 'circle_diam', 'class': 'circle' , 'kwargs': {'segments': 12, 'd': 1}, 'expected': '\n\ncircle($fn = 12, d = 1);', 'args': {}, },
     {'name': 'square', 'class': 'square' , 'kwargs': {'center': False, 'size': 1}, 'expected': '\n\nsquare(center = false, size = 1);', 'args': {}, },