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Graphical data structures in APL

Author:

Martin HardwickAuthors Info & Claims

ACM SIGAPL APL Quote Quad, Volume 12, Issue 1

Pages 129 - 136

https://doi.org/10.1145/390007.805347

Published: 01 September 1981 Publication History

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Abstract

The continuing reduction in the price of graphics terminals has led to greater interest in graphics and computer aided design. This trend has in turn focussed attention on methods of modelling graphical data using programming languages and databases. This paper presents a method of defining, analyzing and transforming graphical data using an extended APL notation.

The fundamental extension this notation makes to APL is to allow the items in an APL array to have a user defined data structure. A consequence of this extension is that the items in an array can now represent graphical entities such as circles, lines, points etc. In conventional APL an item in an array must be either a number or a character. In this extended notation an item in an array might be a structure designed to represent a point, or a circle, or any other entity.

References

[1]

An APL approach to presentation graphics- W.H.Niehoff and A.L.Jones, IBM Systems Journal, Vol.19, No.3, 1980.

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[2]

PASCAL user manual and report- N.Wirth and K.Jensen, Springer-Verlag, New York, 2nd ed., 1978.

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[3]

Revised report on the algorithimic language Algol 68- A. van Wijngaarden et al, Springer-Verlag, Berlin, 2nd ed., 1976.

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[4]

Applications of Relational Databases in Graphics- M.Hardwick, Ph.D. thesis, Dept. of Computer Science, Bristol University, in preperation.

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[5]

Recursive Data Structures in APL- W.E.Gull and M.A.Jenkins, CACM, Vol.22, No.2, Feb. 1979.

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Index Terms

Graphical data structures in APL
1. Computing methodologies
  1. Computer graphics
    1. Graphics systems and interfaces
      1. Graphics file formats
2. Software and its engineering
  1. Software notations and tools
    1. General programming languages
      1. Language types

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Information & Contributors

Information

Published In

ACM SIGAPL APL Quote Quad Volume 12, Issue 1

September 1981

354 pages

ISSN:0163-6006

DOI:10.1145/390007

Issue’s Table of Contents

APL '81: Proceedings of the international conference on APL
October 1981
354 pages
ISBN:0897910354
DOI:10.1145/800142
Chairman:
Richard J. Orgass,
Editors:
William L. Anderson,
David G. Smith

Publisher

Association for Computing Machinery

New York, NY, United States

Publication History

Published: 01 September 1981

Published in SIGAPL Volume 12, Issue 1

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Abstract

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