Trackmouse trackball in pie menu use
Benoît Martin, Poika Isokoski · 2007
We conducted two experiments to guide the design of a pie menu to be used with the trackball component of a device that combines a trackball and a mouse. In the first experiment we measured the accuracy of pie menu specific target selection (angular error). In the second experiment we measured the error rate in menu item selection in a pie menu that was designed based on the findings of the first experiment. The results show that a six item menu can be used at about 3% error rate.