QgsRasterIterator Class Reference

Iterator for sequentially processing raster cells. More...

#include <qgsrasteriterator.h>

Collaboration diagram for QgsRasterIterator:

Classes
struct	RasterPartInfo

Public Member Functions
	QgsRasterIterator (QgsRasterInterface *input)
	~QgsRasterIterator ()
void	startRasterRead (int bandNumber, int nCols, int nRows, const QgsRectangle &extent)
	Start reading of raster band.
bool	readNextRasterPart (int bandNumber, int &nCols, int &nRows, QgsRasterBlock **block, int &topLeftCol, int &topLeftRow)
	Fetches next part of raster data, caller takes ownership of the block and caller should delete the block.
void	stopRasterRead (int bandNumber)
const QgsRasterInterface *	input () const
void	setMaximumTileWidth (int w)
int	maximumTileWidth () const
void	setMaximumTileHeight (int h)
int	maximumTileHeight () const

Private Member Functions
void	removePartInfo (int bandNumber)
	Remove part into and release memory.

Private Attributes
QgsRasterInterface *	mInput
QMap< int, RasterPartInfo >	mRasterPartInfos
QgsRectangle	mExtent
int	mMaximumTileWidth
int	mMaximumTileHeight

Detailed Description

Iterator for sequentially processing raster cells.

Definition at line 30 of file qgsrasteriterator.h.

Constructor & Destructor Documentation

QgsRasterIterator::QgsRasterIterator

(

QgsRasterInterface *

input

)

Definition at line 20 of file qgsrasteriterator.cpp.

QgsRasterIterator::~QgsRasterIterator

(

)

Definition at line 25 of file qgsrasteriterator.cpp.

Member Function Documentation

const QgsRasterInterface* QgsRasterIterator::input ( ) const

inline

Definition at line 61 of file qgsrasteriterator.h.

Referenced by QgsRasterFileWriter::writeDataRaster(), and QgsRasterFileWriter::writeImageRaster().

int QgsRasterIterator::maximumTileHeight ( ) const

inline

Definition at line 67 of file qgsrasteriterator.h.

Referenced by QgsRasterFileWriter::writeDataRaster(), and QgsRasterFileWriter::writeImageRaster().

int QgsRasterIterator::maximumTileWidth ( ) const

inline

Definition at line 64 of file qgsrasteriterator.h.

Referenced by QgsRasterFileWriter::writeDataRaster(), and QgsRasterFileWriter::writeImageRaster().

bool QgsRasterIterator::readNextRasterPart	(	int	bandNumber,
		int &	nCols,
		int &	nRows,
		QgsRasterBlock **	block,
		int &	topLeftCol,
		int &	topLeftRow
	)

Fetches next part of raster data, caller takes ownership of the block and caller should delete the block.

Parameters

bandNumber	band to read
nCols	number of columns on output device
nRows	number of rows on output device
block	address of block pointer
topLeftCol	top left column
topLeftRow	top left row

Returns

false if the last part was already returned

Definition at line 51 of file qgsrasteriterator.cpp.

References QgsRasterInterface::block(), QgsRasterIterator::RasterPartInfo::currentCol, QgsRasterIterator::RasterPartInfo::currentRow, QgsRectangle::height(), mExtent, mInput, mMaximumTileHeight, mMaximumTileWidth, mRasterPartInfos, QgsRasterIterator::RasterPartInfo::nCols, QgsRasterIterator::RasterPartInfo::nRows, QgsRasterIterator::RasterPartInfo::prj, QgsDebugMsg, QgsRectangle::width(), QgsRectangle::xMinimum(), and QgsRectangle::yMaximum().

Referenced by QgsRasterDrawer::draw(), QgsRasterFileWriter::writeDataRaster(), and QgsRasterFileWriter::writeImageRaster().

void QgsRasterIterator::removePartInfo ( int  bandNumber )

private

Remove part into and release memory.

Definition at line 119 of file qgsrasteriterator.cpp.

References mRasterPartInfos, and QgsRasterIterator::RasterPartInfo::prj.

Referenced by startRasterRead(), and stopRasterRead().

void QgsRasterIterator::setMaximumTileHeight ( int  h )

inline

Definition at line 66 of file qgsrasteriterator.h.

Referenced by QgsRasterFileWriter::writeDataRaster(), and QgsRasterFileWriter::writeImageRaster().

void QgsRasterIterator::setMaximumTileWidth ( int  w )

inline

Definition at line 63 of file qgsrasteriterator.h.

Referenced by QgsRasterFileWriter::writeDataRaster(), and QgsRasterFileWriter::writeImageRaster().

void QgsRasterIterator::startRasterRead	(	int	bandNumber,
		int	nCols,
		int	nRows,
		const QgsRectangle &	extent
	)

Start reading of raster band.

Raster data can then be retrieved by calling readNextRasterPart until it returns false.

Parameters

bandNumber	number of raster band to read
nCols	number of columns
nRows	number of rows
extent	area to read

Definition at line 29 of file qgsrasteriterator.cpp.

References QgsRasterIterator::RasterPartInfo::currentCol, QgsRasterIterator::RasterPartInfo::currentRow, mExtent, mInput, mRasterPartInfos, QgsRasterIterator::RasterPartInfo::nCols, QgsRasterIterator::RasterPartInfo::nRows, QgsRasterIterator::RasterPartInfo::prj, and removePartInfo().

Referenced by QgsRasterDrawer::draw(), QgsRasterFileWriter::writeDataRaster(), and QgsRasterFileWriter::writeImageRaster().

void QgsRasterIterator::stopRasterRead

(

int

bandNumber

)

Definition at line 114 of file qgsrasteriterator.cpp.

References removePartInfo().

Member Data Documentation

QgsRectangle QgsRasterIterator::mExtent

private

Definition at line 82 of file qgsrasteriterator.h.

Referenced by readNextRasterPart(), and startRasterRead().

QgsRasterInterface* QgsRasterIterator::mInput

private

Definition at line 80 of file qgsrasteriterator.h.

Referenced by readNextRasterPart(), and startRasterRead().

int QgsRasterIterator::mMaximumTileHeight

private

Definition at line 85 of file qgsrasteriterator.h.

Referenced by readNextRasterPart().

int QgsRasterIterator::mMaximumTileWidth

private

Definition at line 84 of file qgsrasteriterator.h.

Referenced by readNextRasterPart().

QMap<int, RasterPartInfo> QgsRasterIterator::mRasterPartInfos

private

Definition at line 81 of file qgsrasteriterator.h.

Referenced by readNextRasterPart(), removePartInfo(), and startRasterRead().

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The documentation for this class was generated from the following files:

• /tmp/buildd/qgis-2.2.0+wheezy1/src/core/raster/qgsrasteriterator.h
• /tmp/buildd/qgis-2.2.0+wheezy1/src/core/raster/qgsrasteriterator.cpp