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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