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A computer graphics system for block diagram problems

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4 Author(s)

This paper has described the design of an experimental system intended for solving complex problems. Facilities are provided for stating a problem as a labeled block diagram of arbitrary complexity. A block diagram can be drawn on a representative sheet that is many times larger than the screen of the cathode-ray tube. The block diagram may be structured into a hierarchy of sheets allowing blocks to be designed and specified by the user. The modeling subsystem provides a number of viewports so that more than one sheet can be displayed. To make entering of block diagrams easier, a drawing package that does not require commands for creating the diagram but uses only the operands to determine the command is a part of the system. Finally, a data structure in the host computer is provided to allow for easy access to data by any application program.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Systems Journal  (Volume:10 ,  Issue: 2 )