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Graphviz: polygon based nodes

A polygon based node is one of the three main types of nodes, the two others being record based based and user defined.
The geometry of a polygon based node is affected by the attributes Additionally, if shape = polygon, the following attributes are also used:
A shape=point is only affected by

Size of a (polygon based?) shape

The size and geometry of all nodes is affected by the following attributes:
The size of a (only polygon based?) shape is (additionally?) determined by the smallest width and height that is needed to contain its label and image (if so specified) plus the value of the margin attribute. The values of the width and height attribute specify the minimum size. See also fixedsize (if fixedsize=shape, the size of the node equals width and height).

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