qgspointsample.h

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#ifndef QGSPOINTSAMPLE_H
#define QGSPOINTSAMPLE_H

#include "qgsfeature.h"
#include <QString>

class QgsFeature;
class QgsPoint;
class QgsSpatialIndex;
class QgsVectorFileWriter;
class QgsVectorLayer;
class QProgressDialog;

class ANALYSIS_EXPORT QgsPointSample
{
  public:
    QgsPointSample( QgsVectorLayer* inputLayer, const QString& outputLayer, QString nPointsAttribute, QString minDistAttribute = QString() );
    ~QgsPointSample();

    int createRandomPoints( QProgressDialog* pd );

  private:

    QgsPointSample(); //default constructor is forbidden
    void addSamplePoints( QgsFeature& inputFeature, QgsVectorFileWriter& writer, int nPoints, double minDistance );
    bool checkMinDistance( QgsPoint& pt, QgsSpatialIndex& index, double minDistance, QMap< QgsFeatureId, QgsPoint >& pointMap );

    QgsVectorLayer* mInputLayer;
    QString mOutputLayer;
    QString mNumberOfPointsAttribute;
    QString mMinDistanceAttribute;
    QgsFeatureId mNCreatedPoints; //helper to find free ids
};

#endif // QGSPOINTSAMPLE_H