qgsmaptopixel.h

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/***************************************************************************
                          qgsmaptopixel.h  -  description
                             -------------------
    begin                : Sat Jun 22 2002
    copyright            : (C) 2002 by Gary E.Sherman
    email                : sherman at mrcc.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 QGSMAPTOPIXEL
#define QGSMAPTOPIXEL

#include "qgis_core.h"
#include "qgis_sip.h"
#include <QTransform>
#include <vector>
#include "qgsunittypes.h"
#include <cassert>

class QgsPointXY;
class QPoint;

class CORE_EXPORT QgsMapToPixel
{
  public:

    QgsMapToPixel( double mapUnitsPerPixel, double centerX, double centerY, int widthPixels, int heightPixels, double rotation );

    QgsMapToPixel( double mapUnitsPerPixel );

    static QgsMapToPixel fromScale( double scale, QgsUnitTypes::DistanceUnit mapUnits, double dpi = 96 );

    QgsMapToPixel();

    QgsPointXY transform( const QgsPointXY &p ) const;

    void transform( QgsPointXY *p ) const;

    QgsPointXY transform( qreal x, qreal y ) const;

    void transformInPlace( double &x, double &y ) const;

    void transformInPlace( float &x, float &y ) const SIP_SKIP;

#ifndef SIP_RUN

    template <class T> SIP_SKIP
    void transformInPlace( QVector<T> &x, QVector<T> &y ) const
    {
      assert( x.size() == y.size() );
      for ( int i = 0; i < x.size(); ++i )
        transformInPlace( x[i], y[i] );
    }
#endif

    QgsPointXY toMapCoordinates( int x, int y ) const;

    QgsPointXY toMapCoordinatesF( double x, double y ) const;

    QgsPointXY toMapCoordinates( QPoint p ) const;

    QgsPointXY toMapPoint( double x, double y ) const;

    void setMapUnitsPerPixel( double mapUnitsPerPixel );

    double mapUnitsPerPixel() const;

    int mapWidth() const;

    int mapHeight() const;

    void setMapRotation( double degrees, double cx, double cy );

    double mapRotation() const;

    void setParameters( double mapUnitsPerPixel, double centerX, double centerY, int widthPixels, int heightPixels, double rotation );

    QString showParameters() const;

    QTransform transform() const;

    double xCenter() const { return mXCenter; }

    double yCenter() const { return mYCenter; }

  private:
    double mMapUnitsPerPixel = 1;
    int mWidth = 1;
    int mHeight = 1;
    double mRotation = 0.0;
    double mXCenter = 0.5;
    double mYCenter = 0.5;
    double xMin = 0;
    double yMin = 0;
    QTransform mMatrix;

    bool updateMatrix();
};


#endif // QGSMAPTOPIXEL