[_CDCSL_93-16_]<1>Cedar>release>Devices>DevicesDoc.tioga~

DevicesDoc.tioga

Bier, October 31, 1991 1:23 pm PST

Kenneth A. Pier, January 9, 1992 3:28 pm PST

Devices

PCEDAR 2.0 % FOR INTERNAL XEROX USE ONLY

Devices

Representing Input Devices and Their States

Eric A. Bier

Abstract: In the past, Cedar represented exactly two input devices, the mouse and keyboard. The possible events from these devices such as mouse motion and button presses were represented explicitly in general purpose interfaces such as UserInput. Furthermore, the implementation of UserInput and other packages explicitly represents and stores the state of these two input devices. The Device package explicitly represents input devices and their states, making it possible to represent new types of input devices and multiple instances of the same device.

Created by: Eric A. Bier

Maintained by: Eric A. Bier <Bier>

Keywords: mouse, keyboard, FastTRAP, Wacom, digitizer, tablet, pen, stylus, multi-user, multi-device, input handling, input devices

XEROX Xerox Corporation
Palo Alto Research Center
3333 Coyote Hill Road
Palo Alto, California 94304

For Internal Xerox Use Only

1. Introduction

This package currently supports the FastTRAP (trackball) input device and the Wacom digitizer. See below for detailed descriptions. We plan to support mouse and keyboard devices in the future.

2. The FastTRAP

The FastTRAP(TM) device, manufactured by MicroSpeed Inc. of Fremont, California, provides a 2 degree of freedom track ball, three buttons, and a thumbwheel. While the FastTRAP is intended for use with the IBM PC, it connects to the RS232 port of a SPARCstation, and Ken Pier has written a driver for it for RawViewers running on SPARCstations. The driver operates in one of two modes, using the trackball to either drive a PCedar cursor (with 3 buttons) or to send 3D location and button information to the UserInput action queue.

2. The Wacom digitizer

The Wacom digitizer, manufactured by Wacom Inc. of Paramus, New Jersey, provides a standard high-resolution digitizing tablet with a pressure sensitive tip. It connects to the RS232 port of a SPARCstation, and Ken Pier has written a driver for it for RawViewers running on SPARCstations. The driver operates in one of two modes, using the pen to either drive a PCedar cursor (with a single button) or to send location and pressure information to the UserInput action queue.