- fixed issue in the isolation function, if the isolation can't be done there will be generated no Geometry object

FlatCAMObj.py

@@ -876,17 +876,19 @@ class FlatCAMGerber(FlatCAMObj, Gerber):
 
             if invert:
                 try:
-                    if type(geom) is MultiPolygon:
+                    if type(geom) is MultiPolygon or type(geom) is list:
                         pl = []
                         for p in geom:
-                            pl.append(Polygon(p.exterior.coords[::-1], p.interiors))
+                            if p is not None:
+                                pl.append(Polygon(p.exterior.coords[::-1], p.interiors))
                         geom = MultiPolygon(pl)
-                    elif type(geom) is Polygon:
+                    elif type(geom) is Polygon and geom is not None:
                         geom = Polygon(geom.exterior.coords[::-1], geom.interiors)
                     else:
                         log.debug("FlatCAMGerber.isolate().generate_envelope() Error --> Unexpected Geometry")
                 except Exception as e:
                     log.debug("FlatCAMGerber.isolate().generate_envelope() Error --> %s" % str(e))
+                    return 'fail'
             return geom
 
         if float(self.options["isotooldia"]) < 0:
@@ -914,6 +916,9 @@ class FlatCAMGerber(FlatCAMObj, Gerber):
                         geom = generate_envelope(iso_offset, 1, envelope_iso_type=self.iso_type, follow=follow)
                     else:
                         geom = generate_envelope(iso_offset, 0, envelope_iso_type=self.iso_type, follow=follow)
+                    if geom == 'fail':
+                        # app_obj.inform.emit(_("[ERROR_NOTCL] Isolation geometry could not be generated."))
+                        return 'fail'
                     geo_obj.solid_geometry.append(geom)
 
                     # store here the default data for Geometry Data
@@ -1006,11 +1011,14 @@ class FlatCAMGerber(FlatCAMObj, Gerber):
                     # if milling type is climb then the move is counter-clockwise around features
                     if milling_type == 'cl':
                         # geo_obj.solid_geometry = generate_envelope(offset, i == 0)
-                        geo_obj.solid_geometry = generate_envelope(offset, 1, envelope_iso_type=self.iso_type,
+                        geom = generate_envelope(offset, 1, envelope_iso_type=self.iso_type, follow=follow)
-                                                                   follow=follow)
                     else:
-                        geo_obj.solid_geometry = generate_envelope(offset, 0, envelope_iso_type=self.iso_type,
+                        geom = generate_envelope(offset, 0, envelope_iso_type=self.iso_type, follow=follow)
-                                                                   follow=follow)
+                    if geom == 'fail':
+                        # app_obj.inform.emit(_("[ERROR_NOTCL] Isolation geometry could not be generated."))
+                        return 'fail'
+
+                    geo_obj.solid_geometry = geom
 
                     # detect if solid_geometry is empty and this require list flattening which is "heavy"
                     # or just looking in the lists (they are one level depth) and if any is not empty

README.md

@@ -13,6 +13,7 @@ CAD program, and create G-Code for Isolation routing.
 
 - fixed bug that crashed the app after creating a new geometry, if a new object is loaded and the new geometry is deleted and then trying to select the just loaded new object
 - made some GUI elements in Edit -> Preferences to have a minimum width as opposed to the previous fixed one
+- fixed issue in the isolation function, if the isolation can't be done there will be generated no Geometry object 
 
 5.08.2019
 

camlib.py

@@ -544,6 +544,7 @@ class Geometry(object):
         # the previously commented block is replaced with this block - regression - to solve the bug with multiple
         # isolation passes cutting from the copper features
 
+        geo_iso = []
         if offset == 0:
             if follow:
                 geo_iso = self.follow_geometry
@@ -557,14 +558,16 @@ class Geometry(object):
                     if type(self.solid_geometry) is list and len(self.solid_geometry) == 1:
                         geo_iso = self.solid_geometry[0].buffer(offset, int(int(self.geo_steps_per_circle) / 4))
                     else:
-                        geo_iso = self.solid_geometry.buffer(offset, int(int(self.geo_steps_per_circle) / 4))
+                        for el in self.solid_geometry:
+                            geo_iso.append(el.buffer(offset, int(int(self.geo_steps_per_circle) / 4)))
                 else:
                     if type(self.solid_geometry) is list and len(self.solid_geometry) == 1:
                         geo_iso = self.solid_geometry.buffer[0](offset, int(int(self.geo_steps_per_circle) / 4),
                                                                 join_style=corner)
                     else:
-                        geo_iso = self.solid_geometry.buffer(offset, int(int(self.geo_steps_per_circle) / 4),
+                        for el in self.solid_geometry:
-                                                             join_style=corner)
+                            geo_iso.append(el.buffer(offset, int(int(self.geo_steps_per_circle) / 4),
+                                                     join_style=corner))
 
         # end of replaced block
         if follow: