Don't Rely on Gestures
In a well-designed pen application, all operations are possible without
gestures. The application may support gestures as shortcuts, but should not sacrifice
common operations for the sake of the gesture.
Gestures also tend to remain a hidden (or "nondiscoverable") functionality,
which the novice user often does not guess at. Gestures should facilitate the
experienced user without hampering the uninitiated.
provide the same benefits as gestures. Moreover, they are more discoverable
and reliable, since they do not require recognition.
Every pen application should, at minimum, support the cut and lasso gestures.
Anything else is at the discretion of the developer. Incidentally, usability
tests have found that a common gesture among novice users is to scribble over an
entry to erase or undo it. An intelligent application should respond to such
unknown gestures and display a polite inquiry, listing possible alternative
actions that the user can select by tapping.
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