Quantum GIS API Documentation  1.8
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 
00018 #ifndef QGSGEOMETRYANALYZERH
00019 #define QGSGEOMETRYANALYZERH
00020 
00021 #include "qgsvectorlayer.h"
00022 #include "qgsfield.h"
00023 #include "qgsfeature.h"
00024 #include "qgsgeometry.h"
00025 #include "qgsfield.h"
00026 #include "qgsdistancearea.h"
00027 
00028 class QgsVectorFileWriter;
00029 class QProgressDialog;
00030 
00031 
00036 class ANALYSIS_EXPORT QgsGeometryAnalyzer
00037 {
00038   public:
00039 
00048     bool simplify( QgsVectorLayer* layer, const QString& shapefileName, double tolerance,
00049                    bool onlySelectedFeatures = false, QProgressDialog* p = 0 );
00050 
00058     bool centroids( QgsVectorLayer* layer, const QString& shapefileName,
00059                     bool onlySelectedFeatures = false, QProgressDialog* p = 0 );
00060 
00067     bool extent( QgsVectorLayer* layer, const QString& shapefileName, bool onlySelectedFeatures = false, QProgressDialog* p = 0 );
00068 
00078     bool buffer( QgsVectorLayer* layer, const QString& shapefileName, double bufferDistance,
00079                  bool onlySelectedFeatures = false, bool dissolve = false, int bufferDistanceField = -1, QProgressDialog* p = 0 );
00080 
00089     bool convexHull( QgsVectorLayer* layer, const QString& shapefileName, bool onlySelectedFeatures = false,
00090                      int uniqueIdField = -1, QProgressDialog* p = 0 );
00091 
00100     bool dissolve( QgsVectorLayer* layer, const QString& shapefileName, bool onlySelectedFeatures = false,
00101                    int uniqueIdField = -1, QProgressDialog* p = 0 );
00102 
00120     bool eventLayer( QgsVectorLayer* lineLayer, QgsVectorLayer* eventLayer, int lineField, int eventField, QList<int>& unlocatedFeatureIds, const QString& outputLayer,
00121                      const QString& outputFormat, int locationField1, int locationField2 = -1, int offsetField = -1, double offsetScale = 1.0,
00122                      bool forceSingleGeometry = false, QgsVectorDataProvider* memoryProvider = 0, QProgressDialog* p = 0 );
00123 
00125     QgsGeometry* locateBetweenMeasures( double fromMeasure, double toMeasure, QgsGeometry* lineGeom );
00128     QgsGeometry* locateAlongMeasure( double measure, QgsGeometry* lineGeom );
00129 
00130   private:
00131 
00132     QList<double> simpleMeasure( QgsGeometry* geometry );
00133     double perimeterMeasure( QgsGeometry* geometry, QgsDistanceArea& measure );
00135     void simplifyFeature( QgsFeature& f, QgsVectorFileWriter* vfw, double tolerance );
00137     void centroidFeature( QgsFeature& f, QgsVectorFileWriter* vfw );
00139     void bufferFeature( QgsFeature& f, int nProcessedFeatures, QgsVectorFileWriter* vfw, bool dissolve, QgsGeometry** dissolveGeometry,
00140                         double bufferDistance, int bufferDistanceField );
00142     void convexFeature( QgsFeature& f, int nProcessedFeatures, QgsGeometry** dissolveGeometry );
00144     void dissolveFeature( QgsFeature& f, int nProcessedFeatures, QgsGeometry** dissolveGeometry );
00145 
00146     //helper functions for event layer
00147     void addEventLayerFeature( QgsFeature& feature, QgsGeometry* geom, QgsGeometry* lineGeom, QgsVectorFileWriter* fileWriter, QgsFeatureList& memoryFeatures, int offsetField = -1, double offsetScale = 1.0,
00148                                bool forceSingleType = false );
00153     void createOffsetGeometry( QgsGeometry* geom, QgsGeometry* lineGeom, double offset );
00154     QgsPoint createPointOffset( double x, double y, double dist, QgsGeometry* lineGeom ) const;
00155     unsigned char* locateBetweenWkbString( unsigned char* ptr, QgsMultiPolyline& result, double fromMeasure, double toMeasure );
00156     unsigned char* locateAlongWkbString( unsigned char* ptr, QgsMultiPoint& result, double measure );
00157     static bool clipSegmentByRange( double x1, double y1, double m1, double x2, double y2, double m2, double range1, double range2, QgsPoint& pt1, QgsPoint& pt2, bool& secondPointClipped );
00158     static void locateAlongSegment( double x1, double y1, double m1, double x2, double y2, double m2, double measure, bool& pt1Ok, QgsPoint& pt1, bool& pt2Ok, QgsPoint& pt2 );
00159 };
00160 #endif //QGSVECTORANALYZER
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