Browse Prior Art Database

Mapping Support Between Light Pens and Pointing Devices

IP.com Disclosure Number: IPCOM000107954D
Original Publication Date: 1992-Apr-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 2 page(s) / 94K

Publishing Venue

IBM

Related People

Diedrich, RA: AUTHOR [+4]

Abstract

A method of mapping a pointing device select operation into a selector light pen function in a display data stream defined light pen field is disclosed. A method of mapping a light pen tip switch or touch screen operation into a pointing device select function for display data stream-defined pointing device selectable constructs is also disclosed.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Mapping Support Between Light Pens and Pointing Devices

       A method of mapping a pointing device select operation
into a selector light pen function in a display data stream defined
light pen field is disclosed.  A method of mapping a light pen tip
switch or touch screen operation into a pointing device select
function for display data stream-defined pointing device selectable
constructs is also disclosed.

      This article describes the function performed in a workstation
controller (WSC) or programmable workstation (PWS) relative to light
pens or touch screen and pointing devices.  This article applies to a
distributed computing environment consisting of a host processor
which sends a display data stream to a WSC or PWS for processing.  A
WSC provides attachment of multiple non-programmable terminals (NPTs)
to the host computer system.

      The flow of display data streams between a host processor and a
WSC, and NPT commands between a WSC and an NPT, is shown in the
figure.

      A PWS program can provide the same function as the combination
of a WSC with an attached NPT, providing the PWS user access to host-
based NPT applications.  An X server controller performs WSC-like
function and gives multiple X server users access to host-based NPT
applications.

      Some NPTs offer an attached selector light pen.  NPT
applications driven by the light pen were written.  A touch screen
PWS may map a touch of the screen into a light pen tip switch.  A
selector light pen entry field was defined for selector light pen
operation.  Pressing the light pen tip switch in a selector light pen
field causes the cursor to be moved to the field, the first character
of the field to be changed between a "?" and ">" (the first character
is a selection indicator), and the field is marked as modified. The
light pen field can also be defined as auto-enter, which results in
the application being informed of an enter key and field data
whenever the field has been modified.  In most cases, there is no
lig...