qgsvectorwarper.h

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/***************************************************************************
    qgsvectorwarper.h
     --------------------------------------
    Date                 : February 2022
    Copyright            : (C) 2022 by Nyall Dawson
    Email                : nyall dot dawson at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSVECTORWARPER_H
#define QGSVECTORWARPER_H
 
#include "qgis_analysis.h"
#include "qgis_sip.h"
#include "qgsfeatureiterator.h"
#include "qgsgcppoint.h"
#include "qgsgcptransformer.h"
#include "qgstaskmanager.h"
#include "qgsvectorlayerfeatureiterator.h"
 
class QgsFeatureSink;

class ANALYSIS_EXPORT QgsVectorWarper
{
  public:
    explicit QgsVectorWarper( QgsGcpTransformerInterface::TransformMethod method, const QList<QgsGcpPoint> &points, const QgsCoordinateReferenceSystem &destinationCrs );

    bool transformFeatures( QgsFeatureIterator &iterator, QgsFeatureSink *sink, const QgsCoordinateTransformContext &context, QgsFeedback *feedback = nullptr ) const;

    QString error() const { return mError; }
 
  private:
    QgsGcpTransformerInterface::TransformMethod mMethod = QgsGcpTransformerInterface::TransformMethod::Linear;
    QList<QgsGcpPoint> mPoints;
    QgsCoordinateReferenceSystem mDestinationCrs;
 
    mutable QString mError;
};
 

class ANALYSIS_EXPORT QgsVectorWarperTask : public QgsTask
{
    Q_OBJECT
 
  public:
    QgsVectorWarperTask(
      QgsGcpTransformerInterface::TransformMethod method, const QList<QgsGcpPoint> &points, const QgsCoordinateReferenceSystem &destinationCrs, QgsVectorLayer *layer, const QString &fileName
    );
 
    void cancel() override;

    enum class Result
    {
      Success,  
      Canceled, 
      Error,    
    };

    Result result() const { return mResult; }

    QString errorMessage() const { return mErrorMessage; }
 
  protected:
    bool run() override;
 
  private:
    QgsGcpTransformerInterface::TransformMethod mMethod = QgsGcpTransformerInterface::TransformMethod::Linear;
    long long mFeatureCount = 0;
    std::unique_ptr<QgsVectorLayerFeatureSource> mSource;
    QList<QgsGcpPoint> mPoints;
    QgsCoordinateReferenceSystem mDestinationCrs;
 
    QString mDestFileName;
 
    std::unique_ptr<QgsFeedback> mFeedback;
 
    QgsCoordinateTransformContext mTransformContext;
    QgsFields mFields;
    Qgis::WkbType mWkbType = Qgis::WkbType::Unknown;
 
    Result mResult = Result::Success;
    QString mErrorMessage;
    double mLastProgress = 0;
};
 
 
#endif //QGSVECTORWARPER_H