Interface Abstractions for an naplps Page Creation System
Computer programs that allow humans to create pictures are called paint systems. Those that use geometrical shapes as building blocks, rather than brushes, are element-based, rather than canvas-based. The naplps graphics encoding standard, used primarily for videotex, lends itself to the creation of element-based paint systems. The user interface for such a system can be rather complex, because of the need to choose shapes, colours, textures, and the need for editing functions. This paper presents some interface techniques that present the user with a number of easily understood abstractions such as a colour bar, function buttons, and element groups that facilitate the creation of naplps graphics.
KeywordsPaint System Frame Buffer Canadian Standard Association Starting Vertex Current Colour
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