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Crossing-based interface


Crossing-based interfaces are graphical user interfaces that use crossing gestures instead of, or in complement to, pointing.

A pointing task involves moving a cursor inside a graphical object and pressing a button, whereas a goal-crossing task involves moving a cursor beyond a boundary of a targeted graphical object.

Goal crossing has been little investigated, despite sometimes being used on today's interfaces (e.g., mouse-over effects, hierarchical menus navigation, auto-retractable taskbars and hot corners). Still, several advantages of crossing over pointing have been identified:

There are several other ways of triggering actions in user interfaces, either graphic (gestures) and non-graphic (keyboard shortcuts, speech commands).

Variants of Fitts' law have been described for goal-crossing tasks (Accot and Zhai 2002). Fitts' law is seen as a Law of pointing, describing variability in the direction of the pointer's movement. The Law of crossing describes the allowed variability in the direction perpendicular to movement, and the steering law describes movement along a tunnel.


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