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The point as a System.Drawing Point.
Windows coordinates are measured in distances from the top left
of the drawing surface while PDF coordinates are measured from the
bottom left.
So when you use this property the coordinates must be re-mapped.
This needs to be done in the context of a containing object.
Properties such as the Doc.Pos are interpreted in
the context of the Doc.MediaBox. If there is
no containing object then no re-mapping can be performed.
You may find it easier to work with .NET Points than PDF points.
However remember that operations such as Transforms work on the
underlying PDF coordinates and not on the abstracted Windows
coordinates.
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