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VectorComponentValueAccessor Class Template Reference | ![]() |
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Accessor for one component of a vector. More...
#include "vigra/accessor.hxx"
Public Types | |
typedef VECTORTYPE::value_type | value_type |
Public Methods | |
VectorComponentValueAccessor (int index) | |
template<class ITERATOR> value_type | operator() (ITERATOR const &i) const |
template<class ITERATOR, class DIFFERENCE> value_type | operator() (ITERATOR const &i, DIFFERENCE const &diff) const |
template<class V, class ITERATOR> void | set (V value, ITERATOR const &i) const |
template<class V, class ITERATOR, class DIFFERENCE> void | set (V value, ITERATOR const &i, DIFFERENCE const &diff) const |
void | setIndex (int i) |
Detailed Description |
This accessor allows to select a single component (a single 'band') of a vector valued pixel type. The pixel type must support operator[]
. The index of the component to be selected is passed in the constructor. The accessor returns its items by value. If you want to pass/return items by reference, use VectorComponentAccessor. If a floating point number is assigned by means of an accessor with integral value_type, the value is rounded and clipped as appropriate.
Usage:
vigra::BRGBImage image(w,h);
// init red channel with 255
initImage(destImageRange(image,
VectorComponentValueAccessor<vigra::BRGBImage::value_type>(0)),
255);
#include "vigra/accessor.hxx"
Namespace: vigra
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the value_type |
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determine the component to be accessed |
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Read the data item at an offset (can be 1D or 2D or higher order difference). The type |
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Read the current data item. The type |
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Write the data item at an offset (can be 1D or 2D or higher order difference).. The type |
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Write the current data item. The type |
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Reset the index to the given number. |
© Ullrich Köthe (koethe@informatik.uni-hamburg.de) |
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