Acquiring and pointing: an empirical study of pen-tilt-based interaction
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Research literature has shown that pen tilt is a promising input modality in pen-based interaction. However, the human capability to control pen tilt has not been fully evaluated. This paper systematically investigates the human ability to perform discrete target selection tasks by varying the stylus' tilt angle through two controlled experiments: pen tilt target acquiring (Experiment 1) and tilt pointing (Experiment 2). Results revealed a decreasing power relationship between angular width and selection time in Experiment 1. The results of Experiment 2 confirmed that pen tilt pointing can be modeled by Fitts' law. Based on our quantitative analysis, we discuss the human ability to control pen tilt and the implications of pen tilt use.
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