StelObserver.hpp

/*
 * Stellarium
 * Copyright (C) 2002 Fabien Chereau
 *
 * 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, Suite 500, Boston, MA  02110-1335, USA.
 */

#ifndef _STELOBSERVER_HPP_
#define _STELOBSERVER_HPP_

#include "Planet.hpp"
#include "StelLocation.hpp"
#include "VecMath.hpp"

#include <QObject>
#include <QString>
#include <QSharedPointer>


class ArtificialPlanet;
class StelObserver;

class StelObserver : public QObject
{
    Q_OBJECT

public:
    StelObserver(const StelLocation& loc);
    ~StelObserver();

    virtual bool update(double) {return false;}

    Vec3d getCenterVsop87Pos(void) const;
    double getDistanceFromCenter(void) const;
    Vec3d getTopographicOffsetFromCenter(void) const;

    Mat4d getRotAltAzToEquatorial(double JD, double JDE) const;
    Mat4d getRotEquatorialToVsop87(void) const;

    virtual const QSharedPointer<Planet> getHomePlanet(void) const;

    virtual const StelLocation& getCurrentLocation() const {return currentLocation;}

    virtual bool isObserverLifeOver() const {return false;}

    virtual bool isTraveling() const {return false;}

    virtual StelObserver* getNextObserver() const {return new StelObserver(currentLocation);}

protected:
    StelLocation currentLocation;
    QSharedPointer<Planet> planet;
};

class SpaceShipObserver : public StelObserver
{
    Q_OBJECT
public:
    SpaceShipObserver(const StelLocation& startLoc, const StelLocation& target, double transitSeconds=1.f, double timeToGo=-1.0);
    ~SpaceShipObserver();

    virtual bool update(double deltaTime);
    virtual const QSharedPointer<Planet> getHomePlanet() const;
    virtual bool isObserverLifeOver() const {return timeToGo <= 0.;}
    virtual bool isTraveling() const {return !isObserverLifeOver();}
    virtual StelObserver* getNextObserver() const {return new StelObserver(moveTargetLocation);}

    StelLocation getTargetLocation() const { return moveTargetLocation; }
    double getRemainingTime() const { return timeToGo; }
    double getTransitTime() const { return transitSeconds; }

private:
    StelLocation moveStartLocation;
    StelLocation moveTargetLocation;
    QSharedPointer<Planet> artificialPlanet;
    double timeToGo;
    double transitSeconds;
};

#endif // _STELOBSERVER_HPP_