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 ef="module.php?name=Lexikon&file=search&eid=1&query=Ivan e. Sutherland">Ivan e. Sutherland' s 1963 ef="module.php?name=Lexikon&file=search&eid=1&query=MIT">MIT PhD thesis, which opened the field of ef="module.php?name=Lexikon&file=search&eid=1&query=computer graphics">computer graphics. It was the progenitor of computer drawing packages like ef="module.php?name=Lexikon&file=search&eid=1&query=MacDraw">MacDraw or ef="module.php?name=Lexikon&file=search&eid=1&query=Adobe Illustrator">Adobe Illustrator. There is a film of Sketchpad in action. It solved ef="module.php?name=Lexikon&file=search&eid=1&query=constraint">constraints using ef="module.php?name=Lexikon&file=search&eid=1&query=value inference">value inference and introduced the "ef="module.php?name=Lexikon&file=search&eid=1&query=ring">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)

e="border-width:thin; border-color:#333333; border-style:dashed; padding:5px;" align="left">In addition suitable contents:
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