The Difficulty of Centering Circular Discs
نویسنده
چکیده
Centering, positioning an object within specified bounds, is a common computer task, for example making selections using a touch screen or positioning icons relative to each other. The experiments measured times for participants (n = 155) to position a circular cursor with diameter, p = 40 pixel or approximately 10 mm, completely within circular targets with a variety of diameters, w. The analysis divides the total movement time into two parts, the time for the cursor to touch the target and the centering time, the remaining time for participants to indicate that the cursor is completely within the target by clicking on the mouse button. The time to touch the target is modeled well by the initial cursor-target separation, and the centering time is modeled well by the index of difficulty, IDC = p/(w-p). Both models have high correlation, r = 0.99.
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