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[skech-pad] /ˈskɛtʃˌpæd/
sketchbook (def 1). Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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sketchpad in Technology

A program that allowed users to draw on a screen with a light pen. It supported constraints (e.g. drawing a constrained ellipse produced a circle). It also had some computer aided design features (e.g. computing loads on beams).
Sketchpad was the subject of Ivan E. Sutherland's 1963 MIT PhD thesis, which opened the field of computer graphics. It was the progenitor of computer drawing packages like MacDraw or Adobe Illustrator. There is a film of Sketchpad in action.
It solved constraints using value inference and introduced the "ring" list structure.
["Sketchpad: A Man-Machine Graphical Communication System", I.e. Sutherland, MIT Lincoln Lab, TR 296 (Jan 1963)].
[Sammet 1969, p. 678].

The Free On-line Dictionary of Computing, © Denis Howe 2010
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