projector.h

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/*
    Copyright (C) 2010 Henry de Valence <hdevalence@gmail.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.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

*/

#ifndef PROJECTOR_H
#define PROJECTOR_H

#include <cstddef>
#include <Eigen/Core>
USING_PART_OF_NAMESPACE_EIGEN

#include <cmath>

#include <QPointF>

#include "skyobjects/skypoint.h"
#include "skymap.h"

class KStarsData;

class ViewParams
{
public:
    float width, height;
    float zoomFactor;
    bool useRefraction;
    bool useAltAz;
    bool fillGround; 
    SkyPoint *focus;
};

class Projector
{
public:
    explicit Projector( const ViewParams& p );

    virtual ~Projector();

    void setViewParams( const ViewParams& p );

    virtual SkyMap::Projection type() const = 0;

    double fov() const;

    virtual bool unusablePoint( const QPointF &p ) const;
    
    virtual Vector2f toScreenVec( const SkyPoint *o,
                                  bool oRefract = true,
                                  bool* onVisibleHemisphere = 0) const;

    QPointF toScreen( const SkyPoint *o,
                      bool oRefract = true,
                      bool* onVisibleHemisphere = 0) const;

    virtual SkyPoint fromScreen( const QPointF &p, dms *LST, const dms *lat ) const;


    QPointF clipLine( SkyPoint *p1, SkyPoint *p2 ) const;

    Vector2f clipLineVec( SkyPoint *p1, SkyPoint *p2 ) const;

    bool onScreen( const QPointF& p ) const;
    bool onScreen( const Vector2f& p ) const;

    bool checkVisibility( SkyPoint *p ) const;

    double findPA( SkyObject *o, float x, float y ) const;


    virtual QVector<Vector2f> groundPoly( SkyPoint* labelpoint = 0, bool* drawLabel = 0 ) const;

protected:
    virtual double radius() const { return 2*M_PI; }

    virtual double projectionK(double x) const { return x; }

    virtual double projectionL(double x) const { return x; }

    virtual double cosMaxFieldAngle() const { return 0; }

    static SkyPoint pointAt(double az, KStarsData* data);
    
    KStarsData *m_data;
    ViewParams m_vp;
    double m_sinY0, m_cosY0;
    double m_fov;
private:
    //Used by CheckVisibility
    double m_xrange;
    bool m_isPoleVisible;
};

#endif // PROJECTOR_H