Tuesday, May 02, 2017

[cvctzpor] 4 button sliding

Consider four buttons on a touchscreen:

ABBA
CCDD

Button A is not contiguous; it wraps around.  Unambiguous slides (gestures) are possible between any pair of regions.  3 not possible: CAD.

A tetrahedral graph also works, but it is less elegant in a rectangular region.

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