Graphics Environment: 5 Coordinate Space

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The graphics system uses a rectangular coordinate grid to specify the size and position at which drawing commands will be carried out. This is a logical choice as most display devices use a rectangular grid of pixels. "Smart" devices with built in graphics routines tend to use coordinate grids to set place, size, and sometimes movement. "Dumb" devices, capable only of displaying bitmaps, always have these bitmaps described in terms of pixels on a square grid. The GEOS graphics system expects the geode to use the provided device-independent grid to describe graphics commands. The graphics system will then convert this information to device coordinates: coordinates set up for the specific display device, using a grid of pixels.


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