- fixed Tcl Command CncJob

- fixed crash due of Properties Tool trying to have a convex hull area on FlatCAMCNCJob objects which is not possible due of their nature
- modified Tcl Command SubtractRectangle
- fixed and modernized the Tcl Command Scale to be able to scale on X axis or on Y axis or on both and having as scale reference either the (0, 0) point or the minimum point of the bounding box or the center of the bounding box.
- fixed and modernized the Tcl Command Skew

tclCommands/TclCommandSubtractRectangle.py

@@ -4,7 +4,7 @@ from tclCommands.TclCommand import TclCommandSignaled
 
 class TclCommandSubtractRectangle(TclCommandSignaled):
     """
-    Tcl shell command to subtract a rectange from the given Geometry object.
+    Tcl shell command to subtract a rectangle from the given Geometry object.
     """
 
     # array of all command aliases, to be able use  old names for backward compatibility (add_poly, add_polygon)
@@ -13,11 +13,7 @@ class TclCommandSubtractRectangle(TclCommandSignaled):
     # Dictionary of types from Tcl command, needs to be ordered.
     # For positional arguments
     arg_names = collections.OrderedDict([
-        ('name', str),
-        ('x0', float),
-        ('y0', float),
-        ('x1', float),
-        ('y1', float)
+        ('name', str)
     ])
 
     # Dictionary of types from Tcl command, needs to be ordered.
@@ -27,7 +23,7 @@ class TclCommandSubtractRectangle(TclCommandSignaled):
     ])
 
     # array of mandatory options for current Tcl command: required = {'name','outname'}
-    required = ['name', 'x0', 'y0', 'x1', 'y1']
+    required = ['name']
 
     # structured help for current command, args needs to be ordered
     help = {
@@ -37,7 +33,7 @@ class TclCommandSubtractRectangle(TclCommandSignaled):
             ('x0 y0', 'Bottom left corner coordinates.'),
             ('x1 y1', 'Top right corner coordinates.')
         ]),
-        'examples': []
+        'examples': ['subtract_rectangle geo_obj 8 8 15 15']
     }
 
     def execute(self, args, unnamed_args):
@@ -49,12 +45,19 @@ class TclCommandSubtractRectangle(TclCommandSignaled):
             without -somename and  we do not have them in known arg_names
         :return: None or exception
         """
-
+        if 'name' not in args:
+            self.raise_tcl_error("%s:" % _("No Geometry name in args. Provide a name and try again."))
+            return 'fail'
         obj_name = args['name']
-        x0 = args['x0']
-        y0 = args['y0']
-        x1 = args['x1']
-        y1 = args['y1']
+
+        if len(unnamed_args) != 4:
+            self.raise_tcl_error("Incomplete coordinates. There are 4 required: x0 y0 x1 y1.")
+            return 'fail'
+
+        x0 = float(unnamed_args[0])
+        y0 = float(unnamed_args[1])
+        x1 = float(unnamed_args[2])
+        y1 = float(unnamed_args[3])
 
         try:
             obj = self.app.collection.get_by_name(str(obj_name))