Abstract
We present a relational representation of diagrams which accommodates the three fundamental categories of graphical object: points, lines and regions, uniformly. This representation permits a large variety of queries and processes to be performed on the graphical data using the extended relational algebra. We describe a relational picture editor, which we have implemented, which creates the diagrams in the first place and allows them to be displayed and modified. We discuss a low-level data structure, based on dynamic multipaging, which combines the best of the polygon and the pixel representations of pictures, and we examine the interactions of this data structure with the relational representation.
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