Chapter 24

Number of Contacts


Differentiating gestures based on number of fingers, sensing capabilities

That's what an army isa mob; they don't fight with courage that's born in them, but with courage that's borrowed from their mass.

—Mark Twain


The number of simultaneous points of contact tracked by the input device will define the domain of the gesture language that can be developed. Classic hardware for enabling touch allowed one point of contact to be sensed—touching with multiple fingers would yield unpredictable results.

At the dawn of the age of commercial multi-touch, the number of contacts detected by hardware is highly variable. The Windows 7 gesture language, and hardware certification, is written to require ...

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