QGIS API Documentation
3.0.2-Girona (307d082)
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QgsRasterProjector implements approximate projection support for it calculates grid of points in source CRS for target CRS + extent which are used to calculate affine transformation matrices. More...
#include <qgsrasterprojector.h>
Public Types | |
enum | Precision { Approximate = 0, Exact = 1 } |
Precision defines if each pixel is reprojected or approximate reprojection based on an approximation matrix of reprojected points is used. More... | |
Public Types inherited from QgsRasterInterface | |
enum | Capability { NoCapabilities = 0, Size = 1 << 1, Create = 1 << 2, Remove = 1 << 3, BuildPyramids = 1 << 4, Identify = 1 << 5, IdentifyValue = 1 << 6, IdentifyText = 1 << 7, IdentifyHtml = 1 << 8, IdentifyFeature = 1 << 9 } |
If you add to this, please also add to capabilitiesString() More... | |
Public Member Functions | |
QgsRasterProjector () | |
int | bandCount () const override |
Get number of bands. More... | |
QgsRasterBlock * | block (int bandNo, const QgsRectangle &extent, int width, int height, QgsRasterBlockFeedback *feedback=nullptr) override |
Read block of data using given extent and size. More... | |
QgsRasterProjector * | clone () const override |
Clone itself, create deep copy. More... | |
Qgis::DataType | dataType (int bandNo) const override |
Returns data type for the band specified by number. More... | |
bool | destExtentSize (const QgsRectangle &srcExtent, int srcXSize, int srcYSize, QgsRectangle &destExtent, int &destXSize, int &destYSize) |
Calculate destination extent and size from source extent and size. More... | |
QgsCoordinateReferenceSystem | destinationCrs () const |
Get destination CRS. More... | |
Precision | precision () const |
void | setCrs (const QgsCoordinateReferenceSystem &srcCRS, const QgsCoordinateReferenceSystem &destCRS, int srcDatumTransform=-1, int destDatumTransform=-1) |
set source and destination CRS More... | |
void | setPrecision (Precision precision) |
QgsCoordinateReferenceSystem | sourceCrs () const |
Get source CRS. More... | |
Public Member Functions inherited from QgsRasterInterface | |
QgsRasterInterface (QgsRasterInterface *input=nullptr) | |
virtual | ~QgsRasterInterface ()=default |
virtual QgsRasterBandStats | bandStatistics (int bandNo, int stats=QgsRasterBandStats::All, const QgsRectangle &extent=QgsRectangle(), int sampleSize=0, QgsRasterBlockFeedback *feedback=nullptr) |
Get band statistics. More... | |
virtual int | capabilities () const |
Returns a bitmask containing the supported capabilities. More... | |
QString | capabilitiesString () const |
Returns the above in friendly format. More... | |
virtual void | cumulativeCut (int bandNo, double lowerCount, double upperCount, double &lowerValue, double &upperValue, const QgsRectangle &extent=QgsRectangle(), int sampleSize=0) |
Find values for cumulative pixel count cut. More... | |
int | dataTypeSize (int bandNo) |
virtual QgsRectangle | extent () const |
Get the extent of the interface. More... | |
virtual QString | generateBandName (int bandNumber) const |
helper function to create zero padded band names More... | |
virtual bool | hasHistogram (int bandNo, int binCount, double minimum=std::numeric_limits< double >::quiet_NaN(), double maximum=std::numeric_limits< double >::quiet_NaN(), const QgsRectangle &extent=QgsRectangle(), int sampleSize=0, bool includeOutOfRange=false) |
Returns true if histogram is available (cached, already calculated) More... | |
virtual bool | hasStatistics (int bandNo, int stats=QgsRasterBandStats::All, const QgsRectangle &extent=QgsRectangle(), int sampleSize=0) |
Returns true if histogram is available (cached, already calculated). More... | |
virtual QgsRasterHistogram | histogram (int bandNo, int binCount=0, double minimum=std::numeric_limits< double >::quiet_NaN(), double maximum=std::numeric_limits< double >::quiet_NaN(), const QgsRectangle &extent=QgsRectangle(), int sampleSize=0, bool includeOutOfRange=false, QgsRasterBlockFeedback *feedback=nullptr) |
Get histogram. More... | |
virtual QgsRasterInterface * | input () const |
Current input. More... | |
virtual bool | on () const |
Is on/off. More... | |
virtual void | readXml (const QDomElement &filterElem) |
Sets base class members from xml. Usually called from create() methods of subclasses. More... | |
virtual bool | setInput (QgsRasterInterface *input) |
Set input. More... | |
virtual void | setOn (bool on) |
Set on/off. More... | |
virtual Qgis::DataType | sourceDataType (int bandNo) const |
Returns source data type for the band specified by number, source data type may be shorter than dataType. More... | |
virtual const QgsRasterInterface * | sourceInput () const |
Get source / raw input, the first in pipe, usually provider. More... | |
virtual QgsRasterInterface * | sourceInput () |
Get source / raw input, the first in pipe, usually provider. More... | |
virtual void | writeXml (QDomDocument &doc, QDomElement &parentElem) const |
Write base class members to xml. More... | |
virtual int | xBlockSize () const |
Get block size. More... | |
virtual int | xSize () const |
Get raster size. More... | |
virtual int | yBlockSize () const |
virtual int | ySize () const |
Static Public Member Functions | |
static bool | extentSize (const QgsCoordinateTransform &ct, const QgsRectangle &srcExtent, int srcXSize, int srcYSize, QgsRectangle &destExtent, int &destXSize, int &destYSize) |
Calculate destination extent and size from source extent and size. More... | |
static QString | precisionLabel (Precision precision) |
Additional Inherited Members | |
Protected Member Functions inherited from QgsRasterInterface | |
void | initHistogram (QgsRasterHistogram &histogram, int bandNo, int binCount, double minimum=std::numeric_limits< double >::quiet_NaN(), double maximum=std::numeric_limits< double >::quiet_NaN(), const QgsRectangle &boundingBox=QgsRectangle(), int sampleSize=0, bool includeOutOfRange=false) |
Fill in histogram defaults if not specified. More... | |
void | initStatistics (QgsRasterBandStats &statistics, int bandNo, int stats=QgsRasterBandStats::All, const QgsRectangle &boundingBox=QgsRectangle(), int binCount=0) |
Fill in statistics defaults if not specified. More... | |
Protected Attributes inherited from QgsRasterInterface | |
QList< QgsRasterHistogram > | mHistograms |
List of cached histograms, all bands mixed. More... | |
QgsRasterInterface * | mInput = nullptr |
bool | mOn = true |
QList< QgsRasterBandStats > | mStatistics |
List of cached statistics, all bands mixed. More... | |
QgsRasterProjector implements approximate projection support for it calculates grid of points in source CRS for target CRS + extent which are used to calculate affine transformation matrices.
Definition at line 47 of file qgsrasterprojector.h.
Precision defines if each pixel is reprojected or approximate reprojection based on an approximation matrix of reprojected points is used.
Enumerator | |
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Approximate | Approximate (default), fast but possibly inaccurate. |
Exact | Exact, precise but slow. |
Definition at line 57 of file qgsrasterprojector.h.
QgsRasterProjector::QgsRasterProjector | ( | ) |
Definition at line 26 of file qgsrasterprojector.cpp.
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overridevirtual |
Get number of bands.
Implements QgsRasterInterface.
Definition at line 45 of file qgsrasterprojector.cpp.
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overridevirtual |
Read block of data using given extent and size.
Returns pointer to data. Caller is responsible to free the memory returned.
bandNo | band number |
extent | extent of block |
width | pixel width of block |
height | pixel height of block |
feedback | optional raster feedback object for cancelation/preview. Added in QGIS 3.0. |
Implements QgsRasterInterface.
Definition at line 737 of file qgsrasterprojector.cpp.
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overridevirtual |
Clone itself, create deep copy.
Implements QgsRasterInterface.
Definition at line 33 of file qgsrasterprojector.cpp.
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overridevirtual |
Returns data type for the band specified by number.
Implements QgsRasterInterface.
Definition at line 52 of file qgsrasterprojector.cpp.
bool QgsRasterProjector::destExtentSize | ( | const QgsRectangle & | srcExtent, |
int | srcXSize, | ||
int | srcYSize, | ||
QgsRectangle & | destExtent, | ||
int & | destXSize, | ||
int & | destYSize | ||
) |
Calculate destination extent and size from source extent and size.
Definition at line 847 of file qgsrasterprojector.cpp.
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inline |
Get destination CRS.
Definition at line 80 of file qgsrasterprojector.h.
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static |
Calculate destination extent and size from source extent and size.
Definition at line 859 of file qgsrasterprojector.cpp.
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inline |
Definition at line 82 of file qgsrasterprojector.h.
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static |
Definition at line 725 of file qgsrasterprojector.cpp.
void QgsRasterProjector::setCrs | ( | const QgsCoordinateReferenceSystem & | srcCRS, |
const QgsCoordinateReferenceSystem & | destCRS, | ||
int | srcDatumTransform = -1 , |
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int | destDatumTransform = -1 |
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) |
set source and destination CRS
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inline |
Definition at line 83 of file qgsrasterprojector.h.
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inline |
Get source CRS.
Definition at line 77 of file qgsrasterprojector.h.