Quantum GIS API Documentation  1.7.4
src/analysis/vector/qgsgeometryanalyzer.h
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00001 /***************************************************************************
00002     qgsgeometryanalyzer.h - QGIS Tools for vector geometry analysis
00003                              -------------------
00004     begin                : 19 March 2009
00005     copyright            : (C) Carson Farmer
00006     email                : carson.farmer@gmail.com
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 /* $Id: qgis.h 9774 2008-12-12 05:41:24Z timlinux $ */
00018 
00019 #ifndef QGSGEOMETRYANALYZERH
00020 #define QGSGEOMETRYANALYZERH
00021 
00022 #include "qgsvectorlayer.h"
00023 #include "qgsfield.h"
00024 #include "qgsfeature.h"
00025 #include "qgsgeometry.h"
00026 #include "qgsfield.h"
00027 #include "qgsdistancearea.h"
00028 
00029 class QgsVectorFileWriter;
00030 class QProgressDialog;
00031 
00032 
00037 class ANALYSIS_EXPORT QgsGeometryAnalyzer
00038 {
00039   public:
00040 
00049     bool simplify( QgsVectorLayer* layer, const QString& shapefileName, double tolerance,
00050                    bool onlySelectedFeatures = false, QProgressDialog* p = 0 );
00051 
00059     bool centroids( QgsVectorLayer* layer, const QString& shapefileName,
00060                     bool onlySelectedFeatures = false, QProgressDialog* p = 0 );
00061 
00068     bool extent( QgsVectorLayer* layer, const QString& shapefileName, bool onlySelectedFeatures = false, QProgressDialog* p = 0 );
00069 
00079     bool buffer( QgsVectorLayer* layer, const QString& shapefileName, double bufferDistance,
00080                  bool onlySelectedFeatures = false, bool dissolve = false, int bufferDistanceField = -1, QProgressDialog* p = 0 );
00081 
00090     bool convexHull( QgsVectorLayer* layer, const QString& shapefileName, bool onlySelectedFeatures = false,
00091                      int uniqueIdField = -1, QProgressDialog* p = 0 );
00092 
00101     bool dissolve( QgsVectorLayer* layer, const QString& shapefileName, bool onlySelectedFeatures = false,
00102                    int uniqueIdField = -1, QProgressDialog* p = 0 );
00103 
00104   private:
00105 
00106     QList<double> simpleMeasure( QgsGeometry* geometry );
00107     double perimeterMeasure( QgsGeometry* geometry, QgsDistanceArea& measure );
00109     void simplifyFeature( QgsFeature& f, QgsVectorFileWriter* vfw, double tolerance );
00111     void centroidFeature( QgsFeature& f, QgsVectorFileWriter* vfw );
00113     void bufferFeature( QgsFeature& f, int nProcessedFeatures, QgsVectorFileWriter* vfw, bool dissolve, QgsGeometry** dissolveGeometry,
00114                         double bufferDistance, int bufferDistanceField );
00116     void convexFeature( QgsFeature& f, int nProcessedFeatures, QgsGeometry** dissolveGeometry );
00118     void dissolveFeature( QgsFeature& f, int nProcessedFeatures, QgsGeometry** dissolveGeometry );
00119 
00120 };
00121 #endif //QGSVECTORANALYZER
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