Particular embodiments receive a plurality of touch events. Each touch event may be associated with at least one position on a touchscreen, and at least a portion of the plurality of touch events are substantially located along a line. Particular embodiments further determine that: (1) the touch events are approaching an edge of the touchscreen, and (2) one or more pressure measurements taken at one or more of the touch input events are less than a minimum pressure threshold. Based on the determinations, particular embodiments anticipate that the touch events will end before they reach the edge of the touchscreen, and based on the anticipating, particular embodiments terminate a series of extrapolated positions before the series of extrapolated positions reach the edge of the touchscreen.