ArtX class for processing ArtX GUI actions such as marks creation, selection, moving, and resizing.

Members:

IG_ARTX_action_begin_creation	Creates GUI action object of type Mark Creation.
IG_ARTX_action_begin_edit	Creates GUI action object of type Mark Edit.
IG_ARTX_action_begin_move	Creates GUI action object of type Mark Move.
IG_ARTX_action_begin_resize	Creates GUI action object of type Mark Resize.
IG_ARTX_action_begin_selection	Creates GUI action object of type Selection.
IG_ARTX_action_draw	Performs drawing of GUI action.
IG_ARTX_action_end	Ends specified GUI action.
IG_ARTX_action_mouse_down	Passes mouse events to GUI action. It should be called when user presses mouse button.
IG_ARTX_action_mouse_move	Passes mouse events to GUI action. It should be called when user moves mouse pointer.
IG_ARTX_action_mouse_up	Passes mouse events to GUI action. It should be called when user releases mouse button.
IG_ARTX_action_type_get	Returns action's type.