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VectorComponentAccessor [Data Accessors] |
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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 Member Functions | |
| template<class ITERATOR, class DIFFERENCE> | |
| value_type const & | operator() (ITERATOR const &i, DIFFERENCE const &diff) const |
| template<class ITERATOR> | |
| value_type const & | operator() (ITERATOR const &i) const |
| template<class V, class ITERATOR, class DIFFERENCE> | |
| void | set (V const &value, ITERATOR const &i, DIFFERENCE const &diff) const |
| template<class V, class ITERATOR> | |
| void | set (V const &value, ITERATOR const &i) const |
| void | setIndex (int i) |
| VectorComponentAccessor (int index) | |
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 reference. If you want to pass/return items by value, use VectorComponentValueAccessor. 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, VectorComponentAccessor<vigra::BRGBImage::value_type>(0)), 255);
#include <vigra/accessor.hxx>
Namespace: vigra
| typedef VECTORTYPE::value_type value_type |
the value_type
| VectorComponentAccessor | ( | int | index | ) |
determine the component to be accessed
| value_type const& operator() | ( | ITERATOR const & | i, | |
| DIFFERENCE const & | diff | |||
| ) | const |
read the data item at an offset (can be 1D or 2D or higher order difference).
| value_type const& operator() | ( | ITERATOR const & | i | ) | const |
read the current data item
| template<class V, class ITERATOR, class DIFFERENCE> | ||||
| void set | ( | V const & | value, | |
| ITERATOR const & | i, | |||
| DIFFERENCE const & | diff | |||
| ) | const | |||
Write the data item at an offset (can be 1D or 2D or higher order difference).. The type V of the passed in value is automatically converted to value_type. In case of a conversion floating point -> intergral this includes rounding and clipping.
| template<class V, class ITERATOR> | ||||
| void set | ( | V const & | value, | |
| ITERATOR const & | i | |||
| ) | const | |||
Write the current data item. The type V of the passed in value is automatically converted to value_type. In case of a conversion floating point -> intergral this includes rounding and clipping.
| void setIndex | ( | int | i | ) |
Reset the index to the given number.
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© Ullrich Köthe (ullrich.koethe@iwr.uni-heidelberg.de) |
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