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# Class diagram

This class diagram describes the basic layout of Gaphas.

The central class is `GtkView`. It takes a model. A default implementation is provided by gaphas.Canvas. A view is rendered by Painters. Interaction is handled by Tools.

Painting is done by painters. Each painter will paint a layer of the canvas.

Besides the view, there is constraint based connection management. Constraints can be used within an item, and to connect different items.

A default model and item implementations, a line and an element.