SphericalProjection_p.h

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//
// This file is part of the Marble Virtual Globe.
//
// This program is free software licensed under the GNU LGPL. You can
// find a copy of this license in LICENSE.txt in the top directory of
// the source code.
//
// Copyright 2009      Patrick Spendrin <ps_ml@gmx.de>
// Copyright 2012      Cezar Mocan <mocancezar@gmail.com>
//

#ifndef MARBLE_SPHERICALPROJECTIONPRIVATE_H
#define MARBLE_SPHERICALPROJECTIONPRIVATE_H

#include "AbstractProjection_p.h"


namespace Marble
{

class SphericalProjection;

class SphericalProjectionPrivate : public AbstractProjectionPrivate
{

  public:
    explicit SphericalProjectionPrivate( SphericalProjection * parent );

    // This method tessellates a line segment in a way that the line segment
    // follows great circles. The count parameter specifies the
    // number of nodes generated for the polygon. If the
    // clampToGround flag is added the polygon contains count + 2
    // nodes as the clamped down start and end node get added.

    void tessellateLineSegment(  const GeoDataCoordinates &aCoords,
                                qreal ax, qreal ay,
                                const GeoDataCoordinates &bCoords,
                                qreal bx, qreal by,
                                QVector<QPolygonF*> &polygons,
                                const ViewportParams *viewport,
                                TessellationFlags f = 0 ) const;

    void processTessellation(   const GeoDataCoordinates &previousCoords,
                               const GeoDataCoordinates &currentCoords,
                               int count,
                               QVector<QPolygonF*> &polygons,
                               const ViewportParams *viewport,
                               TessellationFlags f = 0 ) const;

    void crossHorizon( const GeoDataCoordinates & bCoord,
                       QVector<QPolygonF*> &polygons,
                       const ViewportParams *viewport ) const;

    virtual bool lineStringToPolygon( const GeoDataLineString &lineString,
                              const ViewportParams *viewport,
                              QVector<QPolygonF*> &polygons ) const;

    void horizonToPolygon( const ViewportParams *viewport,
                           const GeoDataCoordinates & disappearCoords,
                           const GeoDataCoordinates & reappearCoords,
                           QPolygonF* ) const;

    GeoDataCoordinates findHorizon( const GeoDataCoordinates & previousCoords,
                                    const GeoDataCoordinates & currentCoords,
                                    const ViewportParams *viewport,
                                    TessellationFlags f = 0,
                                    int recursionCounter = 0 ) const;

    bool globeHidesPoint( const GeoDataCoordinates &coordinates,
                          const ViewportParams *viewport ) const;

    Q_DECLARE_PUBLIC( SphericalProjection )
};

} // namespace Marble

#endif