interaction

• dragrect Drag rectangle(s) with mouse
• edit_curv interactive graphic curve editor
• eventhandlerfunctions Prototype of functions which may be used as event handler.
• locate mouse selection of a set of points
• seteventhandler set an event handler for the current graphic window
• xclick Wait for a mouse click or an event in a graphic window.
• xgetmouse get the mouse events and current position