Advances in Affective and Pleasurable Design

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especially with the presence of a figure, require users to register click-based

password with pinpoint accuracy.

When using a touch screen device, the user’s finger, hand and arm can obscure

part of the screen. Also, the human finger as a pointing device has very low

“resolution”. These limitations have been observed and tackled before, mostly

notably by Sears, Shneiderman and colleagues (Sears, 1991, Sears et al., 1992).

Their basic technique, called Take-Off, provides a cursor above the user’s finger tip

with a fixed offset when touching the screen. The user drags the cursor to a desired

target and lifts ...