A shape class for ShapedImageNeighborhoodRange and ShapedNeighborhoodIterator

[Niels_Dekker]

@phcerdan Would it be OK to you if the identifiers HyperrectangularImageNeighborhoodShape and GenerateHyperrectangularImageNeighborhoodOffsets would be renamed to RectangularImageNeighborhoodShape and GenerateRectangularImageNeighborhoodOffsets, respectively?

I remember you suggested the term hyperrectangular:

itk::NeighborhoodRange: a new class for efficient modern C++ style iteration

NeighborhoodOffsets.h sounds good to me!. The name GenerateOffsetsForRectangularNeighborhood, might be misleading, because the offsets could be Cubic if Size is 3D. Or lines if Size<1>. I would recommend the more formal GenerateHyperRectangleOffsets, or GenerateNRectangleOffsets? GenerateNCrossOffsets(radius), for one pixel wide Greek cross (+), with the lengths of the cross taken from radius? I would put there: Generate3D26TopologyOffsets, equivalent to GenerateOffsetsForRectangularNeighb…

Wikipedia explained to me that the term hyperrectangle is a “generalization of a rectangle for higher dimensions”.

Personally I feel that the “hyper” adjective is not really necessary, as the template argument VImageDimension already indicates that the rectangle may be generalized for higher dimensionalities.

Note that itk::Image<TPixel, VImageDimension> also supports dimensionalities higher than 2 (even though the ITK image class has not been named something like itk::Hyperimage<THyperpixel, VImageDimension>).

Note also that this shape class supports 1-D as well. Would that be a hypo rectangular shape?

So please tell me, what do you think by now?