||The Pigtail delimiter splits
the user’s gesture into a lasso, which here selects the ink, and a
mark, which here chooses the Copy command from 8 possibilities.
Scriboli is the name of our pen interaction test
bed that we used to experimentally compare delimiters for pen gestures.
A delimiter is “something different” in the input stream that a computer
can use to determine the structure of input phrases. We have studied
four techniques for delimiting a selection-action gesture phrase
consisting of lasso selection plus marking-menu-based command
activation. Multistroke uses one pen stroke for lasso selection, and a
second stroke for marking. Timeout uses dwelling with the pen to split a
single pen gesture into a lasso plus a mark. Button uses a button press
to signal when to delimit the gesture. Pigtail is a novel technique that
uses a small loop to delimit the gesture (see above). Pigtail supports
integrated scope selection, command activation, and direct manipulation
all in a single fluid pen gesture.
In collaboration with
Ken Hinckley (principal
investigator), Gonzalo Ramos, and