How does Fitts' law fit pointing and dragging?

Authors:
Douglas J. Gillan;Kritina Holden;Susan Adam;Marianne Rudisill;Laura Magee
Affiliations:
Lockheed Engineering & Sciences Co., 2400 NASA Rd. 1, Houston. TX and Rice University, Department of Psychology, P.O. 1892, Houston, TX;Lockheed Engineering & Sciences Co., 2400 NASA Rd. 1, Houston, TX;Lockheed Engineering & Sciences Co., 2400 NASA Rd. 1, Houston, TX;NASA/Johnson Space Center, Man-Systems Division, SP 34, Houston, TX;Lockheed Engineering & Sciences Co., 2400 NASA Rd. 1, Houston, TX and Rice University, Department of Psychology, P.O. 1892, Houston, TX
Venue:
CHI '90 Proceedings of the SIGCHI Conference on Human Factors in Computing Systems
Year:
1990

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Abstract

Two experiments examined selecting text using a movement sequence of pointing and dragging. Experiment 1 showed that, in the Point-Drag sequence, the pointing time was related to the pointing distance but not to the width of the text to be selected; in contrast, pointing time was related to both the pointing distance and the width of the text in the Point-Click sequence. Experiment 2 demonstrated that both the pointing and dragging times for the Point-Drag sequence were sensitive to the height of the text that was selected. The discussion of the results centers around the application of Fitts' Law to pointing and dragging in a point-drag sequence, proposing that the target for pointing is the leftmost edge of the text to be selected, and the target for dragging is the rightmost edge of the text.