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American Heritage Dictionary - Cite This Source - Share This
sketch·book    Audio Help   (skěch'bŏŏk')  Pronunciation Key 
n.  
  1. A pad of paper used for sketching. Also called sketchpad.
  2. A book of literary sketches.
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The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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American Heritage Dictionary - Cite This Source - Share This
sketch·pad    Audio Help   (skěch'pād')  Pronunciation Key 
n.   See sketchbook.
(Download Now or Buy the Book)
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2006 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Free On-line Dictionary of Computing - Cite This Source - Share This

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)

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
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