- SmalltalkBestPracticePatterns/DispatchedInterpretation
Rather than Shapes providing #commandAt: and #argumentsAt:, they provide #sendCommantAt: anInteger to: anObject, where #lineFrom:to: is one of the messages that could be sent back. Then the original display code could read:
The name "dispatched interpretation" comes from the distribution of responsibility. The encoded object "dispatches" a message to the client. The client "interprets" the message. Thus, the Shape dispatches message like #lineFrom:to: and #curveFrom:mid:to:. It's up to the clients to interpret the messages, with the PostScriptShapePrinter creating PostScript and the ShapeDisplayer displaying on the screen.
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