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Browse Prior Art Database

Simulating Detection of Digitizer Pen Proximity

IP.com Disclosure Number: IPCOM000115154D
Original Publication Date: 1995-Mar-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Lybrand, DP: AUTHOR

Abstract

Disclosed is the use of algorithms to generate indications that a pen is brought into proximity, or is taken out of proximity, with a digitizer surface. These indications are transmitted to application software requiring such information. Proximity detection before "pen-down" is simulated by providing an extra data point prior to the pen-down event transmitted to the application software. After "pen-up," an indication that the pen has been moved out of proximity is provided through the use of a timeout. This method allows the use of a lower cost digitizer, which does not support proximity detection.

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This is the abbreviated version, containing approximately 74% of the total text.

Simulating Detection of Digitizer Pen Proximity

      Disclosed is the use of algorithms to generate indications that
a pen is brought into proximity, or is taken out of proximity, with a
digitizer surface.  These indications are transmitted to application
software requiring such information.  Proximity detection before
"pen-down" is simulated by providing an extra data point prior to the
pen-down event transmitted to the application software.  After
"pen-up," an indication that the pen has been moved out of proximity
is provided through the use of a timeout.  This method allows the use
of a lower cost digitizer, which does not support proximity
detection.

      When the pen-down situation is detected, the digitizer
controller or device driver provides a "PEN IN PROXIMITY" indication
to the application software, so that this software can do whatever
processing is required after the detection of the pen coming into
proximity.  Then, the controller or device driver immediately
provides the "PEN DOWN" indication.  This technique works with
software which only uses the "PEN IN PROXIMITY" indication to prepare
for the pen-down event; it is insufficient with software which
provides
the user with a required visual feedback upon proximity detection.

      When the pen is raised off the digitizer surface, if it is
returned in a defined period of time, such as one second, it is
assumed that it never left proximity.  If the pen is not returned in
that period of ti...