parameters: (self, canvas=None)
docstring: This call by metacanvas signals that the tool has been
          activated and can now interact with metacanvas.
docstring_summary: This call by metacanvas signals that the tool has been
          activated and can now interact with metacanvas.
docstring_tokens: This call by metacanvas signals that the tool has been activated and can now interact with metacanvas .
function: def activate(self, canvas=None):
          """
          This call by metacanvas signals that the tool has been
          activated and can now interact with metacanvas.
          """
          self.activate_select(canvas)  # calls also set_cursor
          self._is_active = True
function_tokens: def activate ( self , canvas = None ) : self . activate_select ( canvas ) # calls also set_cursor self . _is_active = True