Quantum GIS API Documentation  1.8
src/analysis/vector/qgszonalstatistics.h
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00001 /***************************************************************************
00002                           qgszonalstatistics.h  -  description
00003                           ----------------------------
00004     begin                : August 29th, 2009
00005     copyright            : (C) 2009 by Marco Hugentobler
00006     email                : marco at hugis dot net
00007  ***************************************************************************/
00008 
00009 /***************************************************************************
00010  *                                                                         *
00011  *   This program is free software; you can redistribute it and/or modify  *
00012  *   it under the terms of the GNU General Public License as published by  *
00013  *   the Free Software Foundation; either version 2 of the License, or     *
00014  *   (at your option) any later version.                                   *
00015  *                                                                         *
00016  ***************************************************************************/
00017 
00018 #ifndef QGSZONALSTATISTICS_H
00019 #define QGSZONALSTATISTICS_H
00020 
00021 #include "qgsrectangle.h"
00022 #include <QString>
00023 
00024 class QgsGeometry;
00025 class QgsVectorLayer;
00026 class QProgressDialog;
00027 
00029 class ANALYSIS_EXPORT QgsZonalStatistics
00030 {
00031   public:
00032     QgsZonalStatistics( QgsVectorLayer* polygonLayer, const QString& rasterFile, const QString& attributePrefix = "", int rasterBand = 1 );
00033     ~QgsZonalStatistics();
00034 
00037     int calculateStatistics( QProgressDialog* p );
00038 
00039   private:
00040     QgsZonalStatistics();
00043     int cellInfoForBBox( const QgsRectangle& rasterBBox, const QgsRectangle& featureBBox, double cellSizeX, double cellSizeY,
00044                          int& offsetX, int& offsetY, int& nCellsX, int& nCellsY ) const;
00045 
00047     void statisticsFromMiddlePointTest( void* band, QgsGeometry* poly, int pixelOffsetX, int pixelOffsetY, int nCellsX, int nCellsY,
00048                                         double cellSizeX, double cellSizeY, const QgsRectangle& rasterBBox, double& sum, double& count );
00049 
00050     void statisticsFromMiddlePointTest_improved( void* band, QgsGeometry* poly, int pixelOffsetX, int pixelOffsetY, int nCellsX, int nCellsY,
00051         double cellSizeX, double cellSizeY, const QgsRectangle& rasterBBox, double& sum, double& count );
00052 
00054     void statisticsFromPreciseIntersection( void* band, QgsGeometry* poly, int pixelOffsetX, int pixelOffsetY, int nCellsX, int nCellsY,
00055                                             double cellSizeX, double cellSizeY, const QgsRectangle& rasterBBox, double& sum, double& count );
00056 
00057 
00058     QString mRasterFilePath;
00060     int mRasterBand;
00061     QgsVectorLayer* mPolygonLayer;
00062     QString mAttributePrefix;
00064     float mInputNodataValue;
00065 };
00066 
00067 #endif // QGSZONALSTATISTICS_H
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