Large high-resolution displays combine high pixel density with ample physical dimensions.The combination of these factors creates\na multiscale workspace where interactive targeting of on-screen objects requires both high speed for distant targets and high\naccuracy for small targets. Modern operating systems support implicit dynamic control-display gain adjustment (i.e., a pointer\nacceleration curve) that helps to maintain both speed and accuracy. However, large high-resolution displays require a broader\nrange of control-display gains than a single acceleration curve can usably enable. Some interaction techniques attempt to solve the\nproblem by utilizing multiple explicit modes of interaction, where different modes provide different levels of pointer precision.\nHere, we investigate the alternative hypothesis of using a single mode of interaction for continuous pointing that enables both (1)\nstandard implicit granularity control via an acceleration curve and (2) explicit switching betweenmultiple acceleration curves in an\nefficient and dynamic way.We evaluate a sample solution that augments standard touchpad accelerated pointer manipulation with\nmultitouch capability, where the choice of acceleration curve dynamically changes depending on the number of fingers in contact\nwith the touchpad. Specifically, users can dynamically switch among three different acceleration curves by using one, two, or three\nfingers on the touchpad.
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