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6 - Touch Interfaces and Gestures
Today’s mobile devices and many PC monitors incorporate touch-
screen technology, which makes it easier for many users to interact with the
devices and their programs. A simple finger tap selects an object or presses a
button, a finger swipe scrolls a list of photos on the screen, and a pinch
zooms out on an image.
Any finger move is referred to as a gesture, which can involve a
single finger (one-touch, such as press, tap, press and hold, slide to pan, and
so on) or a finger and a thumb (two-touch, such as a pinch and stretch or a
turn to rotate). The action the application takes in response to a gesture is
called a touch event.
