- finished adding in Paint Tool the usage of an external object to set the extent of th area painted. For simple shapes (single Polygon) the shape can be anything, for the rest will be a convex hull of the reference object

- modified NCC tool so for simple objects (single Polygon) the external object used as reference can have any shape, for the other types of objects the copper cleared area will be the convex hull of the reference object
- modified the strings of the app wherever they contained the char seq <b> </b> so it is not included in the translated string

flatcamTools/ToolNonCopperClear.py

@@ -10,10 +10,10 @@ from FlatCAMTool import FlatCAMTool
 from copy import copy, deepcopy
 from ObjectCollection import *
 import time
+from shapely.geometry import base
 
 import gettext
 import FlatCAMTranslation as fcTranslate
-from shapely.geometry import base
 import builtins
 
 fcTranslate.apply_language('strings')
@@ -860,12 +860,16 @@ class NonCopperClear(FlatCAMTool, Gerber):
             return "Could not retrieve object: %s" % self.obj_name
 
         # Prepare non-copper polygons
+        geo_n = self.bound_obj.solid_geometry
         try:
-            if not isinstance(self.bound_obj.solid_geometry, MultiPolygon):
+            if isinstance(geo_n, MultiPolygon):
+                env_obj = geo_n.convex_hull
+            elif (isinstance(geo_n, MultiPolygon) and len(geo_n) == 1) or \
+                    (isinstance(geo_n, list) and len(geo_n) == 1) and isinstance(geo_n[0], Polygon):
+                env_obj = cascaded_union(self.bound_obj.solid_geometry)
+            else:
                 env_obj = cascaded_union(self.bound_obj.solid_geometry)
                 env_obj = env_obj.convex_hull
-            else:
-                env_obj = self.bound_obj.solid_geometry.convex_hull
             bounding_box = env_obj.buffer(distance=margin, join_style=base.JOIN_STYLE.mitre)
         except Exception as e:
             log.debug("NonCopperClear.on_ncc() --> %s" % str(e))