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Sketchpad : FOLDOC
Sketchpad
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].
(1995-02-14)



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