Summary
In this paper, the author describes the Sketchpad system. Since the hardware of the time was limited, the author uses a light pen and a combination of push buttons, on and off switches, and turning knobs to input and manipulate data in the system. The system is only able to use lines, circles, and points but the data structure for each was well defined along with the types of constraints that may be used. Several examples of Sketchpad projects were given including bridge drawings, artistic drawings, and electrical circuit diagrams.
Discussion
This paper introduces many ideas that are still used in sketch input systems today such the data structures and constraint systems presented. The idea of copying instances and being able to have sub-pictures within sub-pictures allows for more efficient sketches to be created. The constraint system introduced is very useful for defining components composed of subcomponents.
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