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Proceedings Paper

Applying public access programming techniques to astronomical image display
Author(s): Eric Mandel
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Paper Abstract

The X Public Access (XPA) mechanism allows an Xt program to define named public access points through which data and commands can be exchanged with other programs. We will discuss our design goals for XPA, the technical challenges we faced--including extensions to the Xt selection implementation--and the user interface and application programming interface that we developed to meet these challenges. We also will describe our application of XPA to a new version of the popular SAOimage astronomical image display program. XPA makes possible external control of the program's main function, including image display, image zoom and pan, colormap manipulation, cursor/region definition, and frame selection. It also supports `public access' to internal algorithms such as image file access and scaling. Finally, we will describe how XPA is used to support user-configurable analysis of image data and bi- directional communication with other processes.

Paper Details

Date Published: 8 March 1996
PDF: 12 pages
Proc. SPIE 2656, Visual Data Exploration and Analysis III, (8 March 1996); doi: 10.1117/12.234670
Show Author Affiliations
Eric Mandel, Smithsonian Astrophysical Observatory (United States)

Published in SPIE Proceedings Vol. 2656:
Visual Data Exploration and Analysis III
Georges G. Grinstein; Robert F. Erbacher, Editor(s)

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