Bringing up to date with VisPyCanvas. Mostly migration of Tcl commands to new architecture.

tclCommands/TclCommandSubtractPoly.py

@@ -0,0 +1,62 @@
+from ObjectCollection import *
+import TclCommand
+
+
+class TclCommandSubtractPoly(TclCommand.TclCommandSignaled):
+    """
+    Tcl shell command to create a new empty Geometry object.
+    """
+
+    # array of all command aliases, to be able use  old names for backward compatibility (add_poly, add_polygon)
+    aliases = ['subtract_poly']
+
+    # Dictionary of types from Tcl command, needs to be ordered.
+    # For positional arguments
+    arg_names = collections.OrderedDict([
+        ('name', str)
+    ])
+
+    # Dictionary of types from Tcl command, needs to be ordered.
+    # For options like -optionname value
+    option_types = collections.OrderedDict([
+
+    ])
+
+    # array of mandatory options for current Tcl command: required = {'name','outname'}
+    required = ['name']
+
+    # structured help for current command, args needs to be ordered
+    help = {
+        'main': "Subtract polygon from the given Geometry object.",
+        'args': collections.OrderedDict([
+            ('name', 'Name of the Geometry object from which to subtract.'),
+            ('x0 y0 x1 y1 x2 y2 ...', 'Points defining the polygon.')
+        ]),
+        'examples': []
+    }
+
+    def execute(self, args, unnamed_args):
+        """
+        execute current TCL shell command
+
+        :param args: array of known named arguments and options
+        :param unnamed_args: array of other values which were passed into command
+            without -somename and  we do not have them in known arg_names
+        :return: None or exception
+        """
+
+        obj_name = args['name']
+
+        if len(unnamed_args) % 2 != 0:
+            return "Incomplete coordinate."
+
+        points = [[float(unnamed_args[2 * i]), float(unnamed_args[2 * i + 1])] for i in range(len(unnamed_args) / 2)]
+
+        try:
+            obj = self.app.collection.get_by_name(str(obj_name))
+        except:
+            return "Could not retrieve object: %s" % obj_name
+        if obj is None:
+            return "Object not found: %s" % obj_name
+
+        obj.subtract_polygon(points)