Added PCB controller mount feature options.

Also, working on modular trackball, though ball bearings make it difficult to decouple as they typically land in the middle of the walls and webs.

1 files changed, 20 insertions, 11 deletions

diff --git a/src/helpers_solid.py b/src/helpers_solid.py
index 174d65a..2557e01 100644
--- a/src/helpers_solid.py
+++ b/src/helpers_solid.py
@@ -23,10 +23,14 @@ def cone(r1, r2, height):
 
 
 def rotate(shape, angle):
+    if shape is None:
+        return None
     return sl.rotate(angle)(shape)
 
 
 def translate(shape, vector):
+    if shape is None:
+        return None
     return sl.translate(tuple(vector))(shape)
 
 
@@ -47,10 +51,11 @@ def union(shapes):
     debugprint('union()')
     shape = None
     for item in shapes:
-        if shape is None:
-            shape = item
-        else:
-            shape += item
+        if item is not None:
+            if shape is None:
+                shape = item
+            else:
+                shape += item
     return shape
 
 
@@ -58,23 +63,27 @@ def add(shapes):
     debugprint('union()')
     shape = None
     for item in shapes:
-        if shape is None:
-            shape = item
-        else:
-            shape += item
+        if item is not None:
+            if shape is None:
+                shape = item
+            else:
+                shape += item
     return shape
 
 
 def difference(shape, shapes):
     debugprint('difference()')
     for item in shapes:
-        shape -= item
+        if item is not None:
+            shape -= item
     return shape
 
 
 def intersect(shape1, shape2):
-    return sl.intersection()(shape1, shape2)
-
+    if shape2 is not None:
+        return sl.intersection()(shape1, shape2)
+    else:
+        return shape1
 
 def hull_from_points(points):
     return sl.hull()(*points)