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Base Stream Class StreamAcad
§Abstract base class for all Aec streams
§Numerous signatures accept a wide variety of geometric input
§Decompose geometric input into more elemental forms
§Eventual result is simple vectors (startpoint, endpoint)
§Derived stream classes override some geometry signatures
§Each stream can use that to produce optimal output
§Derived streams may be used for collections, filters, calculations, summations, and interfaces into other systems
§A stream contains several stacks for storing the current color, linetype, lineweight, layer, gsmarker, transformation, linetype scale, rendermode, fill type, entity, view information, etc.
§Properties pushed onto the stack have a corresponding pop after the necessary geometry has been streamed through
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