Chapter 18

The Anatomy of a Gesture


What is a gesture, model of a gesture, abstraction, registration, continuation, termination

Anatomy is destiny.

—Sigmund Freud


According to Wu and his co-authors, a gesture consists of three stages (Figure 18.1). Registration is the moment that the type of action is set. Next is continuation, which adjusts the parameters of the gesture. Last comes termination, which is when the gesture ends. For the engineers, a gesture can be thought of as a function call: The user selects the function at the registration phase and specifies the parameters of the function during the continuation phase, and the function is executed at the termination phase (Table 18.1). In most touch systems, these phases ...

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