QgsRasterCalculator Class Reference

Raster calculator class. More...

#include <qgsrastercalculator.h>

Collaboration diagram for QgsRasterCalculator:

List of all members.

Public Member Functions
	QgsRasterCalculator (const QString &formulaString, const QString &outputFile, const QString &outputFormat, const QgsRectangle &outputExtent, int nOutputColumns, int nOutputRows, const QVector< QgsRasterCalculatorEntry > &rasterEntries)
	~QgsRasterCalculator ()
int	processCalculation (QProgressDialog *p=0)
	Starts the calculation and writes new raster.
Private Member Functions
	QgsRasterCalculator ()
GDALDriverH	openOutputDriver ()
	Opens the output driver and tests if it supports the creation of a new dataset.
GDALDatasetH	openOutputFile (GDALDriverH outputDriver)
	Opens the output file and sets the same geotransform and CRS as the input data.
void	readRasterPart (double *targetGeotransform, int xOffset, int yOffset, int nCols, int nRows, double *sourceTransform, GDALRasterBandH sourceBand, float *rasterBuffer)
	Reads raster pixels from a dataset/band.
bool	transformationsEqual (double *t1, double *t2) const
	Compares two geotransformations (six parameter double arrays.
void	outputGeoTransform (double *transform) const
	Sets gdal 6 parameters array from mOutputRectangle, mNumOutputColumns, mNumOutputRows.
Private Attributes
QString	mFormulaString
QString	mOutputFile
QString	mOutputFormat
QgsRectangle	mOutputRectangle
	Output raster extent.
int	mNumOutputColumns
	Number of output columns.
int	mNumOutputRows
	Number of output rows.
QVector< QgsRasterCalculatorEntry >	mRasterEntries

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Detailed Description

Raster calculator class.

Definition at line 39 of file qgsrastercalculator.h.

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Constructor & Destructor Documentation

QgsRasterCalculator::QgsRasterCalculator	(	const QString &	formulaString,
		const QString &	outputFile,
		const QString &	outputFormat,
		const QgsRectangle &	outputExtent,
		int	nOutputColumns,
		int	nOutputRows,
		const QVector< QgsRasterCalculatorEntry > &	rasterEntries
	)

Definition at line 34 of file qgsrastercalculator.cpp.

QgsRasterCalculator::~QgsRasterCalculator

(

)

Definition at line 40 of file qgsrastercalculator.cpp.

QgsRasterCalculator::QgsRasterCalculator

(

)

[private]

Definition at line 248 of file qgsrastercalculator.cpp.

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Member Function Documentation

GDALDriverH QgsRasterCalculator::openOutputDriver

(

)

[private]

Opens the output driver and tests if it supports the creation of a new dataset.

Returns:

NULL on error and the driver handle on success

Definition at line 252 of file qgsrastercalculator.cpp.

References mOutputFormat.

Referenced by processCalculation().

GDALDatasetH QgsRasterCalculator::openOutputFile

(

GDALDriverH

outputDriver

)

[private]

Opens the output file and sets the same geotransform and CRS as the input data.

Returns:

the output dataset or NULL in case of error

Definition at line 273 of file qgsrastercalculator.cpp.

References mNumOutputColumns, mNumOutputRows, mOutputFile, and outputGeoTransform().

Referenced by processCalculation().

void QgsRasterCalculator::outputGeoTransform

(

double *

transform

)

const [private]

Sets gdal 6 parameters array from mOutputRectangle, mNumOutputColumns, mNumOutputRows.

Parameters:

transform

double[6] array that receives the GDAL parameters

Definition at line 400 of file qgsrastercalculator.cpp.

References QgsRectangle::height(), mNumOutputColumns, mNumOutputRows, mOutputRectangle, QgsRectangle::width(), QgsRectangle::xMinimum(), and QgsRectangle::yMaximum().

Referenced by openOutputFile(), and processCalculation().

int QgsRasterCalculator::processCalculation

(

QProgressDialog *

p = 0

)

Starts the calculation and writes new raster.

Parameters:

p	progress bar (or 0 if called from non-gui code)

Returns:

0 in case of success

Definition at line 44 of file qgsrastercalculator.cpp.

References QgsCoordinateReferenceSystem::authid(), QgsRasterCalcNode::calculate(), QgsMapLayer::crs(), QgsRasterMatrix::data(), QgsRasterMatrix::isNumber(), mFormulaString, mNumOutputColumns, mNumOutputRows, mOutputFile, mRasterEntries, QgsRasterMatrix::nodataValue(), QgsRasterMatrix::number(), openOutputDriver(), openOutputFile(), outputGeoTransform(), QgsRasterCalcNode::parseRasterCalcString(), readRasterPart(), TO8, and QgsCoordinateReferenceSystem::toWkt().

void QgsRasterCalculator::readRasterPart	(	double *	targetGeotransform,
		int	xOffset,
		int	yOffset,
		int	nCols,
		int	nRows,
		double *	sourceTransform,
		GDALRasterBandH	sourceBand,
		float *	rasterBuffer
	)		[private]

Reads raster pixels from a dataset/band.

Parameters:

targetGeotransform	transformation parameters of the requested raster array (not necessarily the same as the transform of the source dataset)
xOffset	x offset
yOffset	y offset
nCols	number of columns
nRows	number of rows
sourceTransform	source transformation
sourceBand	source band
rasterBuffer	raster buffer

Definition at line 291 of file qgsrastercalculator.cpp.

References QgsRectangle::intersect(), QgsRectangle::isEmpty(), transformationsEqual(), QgsRectangle::xMaximum(), QgsRectangle::xMinimum(), QgsRectangle::yMaximum(), and QgsRectangle::yMinimum().

Referenced by processCalculation().

bool QgsRasterCalculator::transformationsEqual	(	double *	t1,
		double *	t2
	)		const [private]

Compares two geotransformations (six parameter double arrays.

Definition at line 388 of file qgsrastercalculator.cpp.

References doubleNear().

Referenced by readRasterPart().

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Member Data Documentation

QString QgsRasterCalculator::mFormulaString [private]

Definition at line 88 of file qgsrastercalculator.h.

Referenced by processCalculation().

int QgsRasterCalculator::mNumOutputColumns [private]

Number of output columns.

Definition at line 95 of file qgsrastercalculator.h.

Referenced by openOutputFile(), outputGeoTransform(), and processCalculation().

int QgsRasterCalculator::mNumOutputRows [private]

Number of output rows.

Definition at line 97 of file qgsrastercalculator.h.

Referenced by openOutputFile(), outputGeoTransform(), and processCalculation().

QString QgsRasterCalculator::mOutputFile [private]

Definition at line 89 of file qgsrastercalculator.h.

Referenced by openOutputFile(), and processCalculation().

QString QgsRasterCalculator::mOutputFormat [private]

Definition at line 90 of file qgsrastercalculator.h.

Referenced by openOutputDriver().

QgsRectangle QgsRasterCalculator::mOutputRectangle [private]

Output raster extent.

Definition at line 93 of file qgsrastercalculator.h.

Referenced by outputGeoTransform().

QVector<QgsRasterCalculatorEntry> QgsRasterCalculator::mRasterEntries [private]

Definition at line 100 of file qgsrastercalculator.h.

Referenced by processCalculation().

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

• src/analysis/raster/qgsrastercalculator.h
• src/analysis/raster/qgsrastercalculator.cpp