On The Costs Of Multiple Trajectory Pointing Methods
CHI '11: CHI Conference on Human Factors in Computing Systems Vancouver BC Canada May, 2011(2011)
摘要
Several enhanced pointing techniques aim to reduce the Fitts' law targeting distance by providing multiple target trajectories in the hope that a shorter path is available. However, these techniques introduce a search or decision component to pointing - users must examine the alternatives available and decide upon the trajectory to use. We analyse these difficulties, present a methodology for examining them as well as other behaviour issues, and report empirical results of performance with pointer wrapping and Ninja cursors. Results show that offering multiple trajectories incurs a significant search or decision cost, and that users are therefore poor at capitalising on the theoretical benefits of reduced target distance.
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关键词
Pointing,Fitts' law,Ninja cursors,wrapping cursors,multiple trajectories,search/decision
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