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Sketchpad ran on the MIT Lincoln Laboratory TX-2 (1958) computer at the Massachusetts Institute of Technology (MIT), which had 64k of 36-bit words.The user drew on the computer monitor screen with the recently invented light pen, which relayed information on its position by computing at what time the light from the scanning cathode-ray tube screen is detected.
Sketchpad [ edit ] Described as being "a simple blank canvas where you can quickly and easily draw an idea, doodle, create, and solve problems", it is a place where the user can sketch out whatever comes to their mind without launching a full blown drawing program such as SketchBook or Clip Studio Paint .
An early commercial program that allowed users to design, draw, and manipulate objects was the program MacPaint. This program's first version was introduced on January 22, 1984, on the Apple Lisa. The ability to freehand draw and create graphics with this program made it the top program of its kind during 1984. [3]
Live Geometry is a free CodePlex project that lets you create interactive ruler and compass constructions and experiment with them. It is written in Silverlight 4 and C# 4.0 (Visual Studio 2010). The core engine is a flexible and extensible framework that allows easy addition of new figure types and features.
Sketchbook features a radial/pie-menu user interface and has painting and drawing tools such as pencils, markers, and brushes.It uses pressure-sensitive features of digital drawing pads, tablet computers, and smartphones to create effects similar to traditional materials.
Sketchpad was an innovative program that influenced alternative forms of interaction with computers. Sketchpad could accept constraints and specified relationships among segments and arcs, including the diameter of arcs. It could draw both horizontal and vertical lines and combine them into figures and shapes.