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clutching

clutching

In Proceedings of UIST 2007
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RubberEdge: reducing clutching by combining position and rate control with elastic feedback (p. 129-138)

Abstract plus

Position control devices enable precise selection, but significant clutching degrades performance. Clutching can be reduced with high control-display gain or pointer acceleration, but there are human and device limits. Elastic rate control eliminates clutching completely, but can make precise selection difficult. We show that hybrid position-rate control can outperform position control by 20% when there is significant clutching, even when using pointer acceleration. Unlike previous work, our RubberEdge technique eliminates trajectory and velocity discontinuities. We derive predictive models for position control with clutching and hybrid control, and present a prototype RubberEdge position-rate control device including initial user feedback.

In Proceedings of UIST 2009
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ARC-Pad: absolute+relative cursor positioning for large displays with a mobile touchscreen (p. 153-156)

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We introduce ARC-Pad (Absolute+Relative Cursor pad), a novel technique for interacting with large displays using a mobile phone's touchscreen. In ARC-Pad we combine ab-solute and relative cursor positioning. Tapping with ARC-Pad causes the cursor to jump to the corresponding location on the screen, providing rapid movement across large distances. For fine position control, users can also clutch using relative mode. Unlike prior hybrid cursor positioning techniques, ARC-Pad does not require an explicit switch between relative and absolute modes. We compared ARC-Pad with the relative positioning commonly found on touchpads. Users were given a target acquisition task on a large display, and results showed that they were faster with ARC-Pad, without sacrificing accuracy. Users welcomed the benefits associated with ARC-Pad.