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A basic objective in the design of a package of general-purpose graphics subroutines was to make them accessible to FORTRAN programmers while circumventing some of the limitations of that language for graphics applications. This paper discusses how observation of graphics applications led to the establishment of design criteria for a subroutine package to facilitate the generation of interactive displays. It outlines how application programmers would use the package, including provisions for communication between the console and the program. Many of the fundamental concepts that characterize the package are described, including provisions for display modification and animation.
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