Chapter 24
Number of Contacts
Keywords
Differentiating gestures based on number of fingers, sensing capabilities
That's what an army is—a mob; they don't fight with courage that's born in them, but with courage that's borrowed from their mass.
—Mark Twain
Description
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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