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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].
References in periodicals archive ?
The sketchpad representation of the hand-made model is shown in Figure 1.
We have FOUR merchandise packs from the film to give away, including a T-shirt, tote bag, sketchpad, pencil tin and pencils and the CD soundtrack.
This neat unit really does open up the iPad to being more than just a sketchpad for musicians.
The Director addressed a specialist RAS meeting on 2012 Jan 13, concerning 'Astronomy in the sketchpad era', giving new insights into visual observation and historical techniques for reproducing illustrations.
My son likes to bring along his sketchpad and pens and spend time in front of paintings that catch his interest and make quick drawings.
Adobe Ideas : This acts as a sketchpad that can help with your designs and can capture ideas quickly and easily.
USING his sketchpad and paint a Cardiff artist has recorded images of war with a difference.
The one constant throughout the three-day event will be the sketchpad.
But in between changing the pop music landscape forever, the Beatle was never far from a sketchpad and pen.
Gazmend Kalemi, an associate professor with GUtech brought his sketchpad.
The type modeled in this article is Geometer's Sketchpad, known as GSP (Jackiv, 2000).