Sharing Between Graphical Objects Using Delegation

We investigate the suitability of object-oriented paradigms for graphics by comparing a variety of object-oriented graphics systems and noting which of their features are readily modeled by class-instance systems and which by delegation systems. We examine how these systems establish patterns of sharing of data and behavior, and note that these patterns are established in a remarkably consistent fashion. We conclude that these patterns of sharing are more naturally modeled in a delegation system than in a class-instance system.

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