1. A method, comprising: receiving, by a computer, a sequence of signals indicating a motion of a hand of a user within a predefined area; segmenting the area into multiple regions; identifying, responsively to the signals, a region in which the hand is located; assigning a mapping ratio to the motion of the hand based on a direction of the motion and the region in which the hand is located; and presenting, using the assigned mapping ratio, a cursor on a display responsively to the indicated motion of the hand.