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The Free On-line Dictionary of Computing (foldoc)

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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