[Insight-users] Iterating over an adaptor?

[Bill Lorensen]

David,

This test:

Modules/Core/ImageAdaptors/test/itkVectorImageTest.cxx uses iterators on
vector adaptors.

Bill

On Tue, Nov 1, 2011 at 9:11 AM, David Doria <daviddoria at gmail.com> wrote:

> If I create an adaptor to represent one channel of a vector image:
>
> typedef itk::VectorImage<float, 2> VectorImageType;
>
>   VectorImageType::Pointer image = VectorImageType::New();
>   ... Create image ...
>
>   typedef itk::VectorImageToImageAdaptor<float, 2> ImageAdaptorType;
>   ImageAdaptorType::Pointer adaptor = ImageAdaptorType::New();
>   adaptor->SetExtractComponentIndex(0);
>   adaptor->SetImage(image);
>
> And then try to create an iterator:
>
>   itk::ImageRegionIterator<ImageAdaptorType> imageIterator(adaptor,
> adaptor->GetLargestPossibleRegion());
>
> I get this error:
>
> itkImageAdaptor.hxx:334:36: error: cannot convert ‘itk::VectorImage<float,
> 2u>::InternalPixelType* {aka float*}’ to ‘const InternalPixelType* {aka
> const itk::VariableLengthVector<float>*}’ in return
>
> I also tried using the resulting scalar image type for the iterator:
>
> typedef itk::Image<float, 2> ScalarImageType;
> itk::ImageRegionIterator<ScalarImageType> imageIterator(adaptor,
> adaptor->GetLargestPossibleRegion());
>
> but of course I get this error:
> VectorImageToImageAdaptor.cxx:35:103: error: no matching function for call
> to ‘itk::ImageRegionIterator<itk::Image<float, 2u>
> >::ImageRegionIterator(itk::VectorImageToImageAdaptor<float, 2u>::Pointer&,
> const RegionType&)’
>
> Is it not possible to iterate over an adaptor like this?
>
> Thanks,
>
> David
>
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