body.hpp

/* ----------------------------------------------------------------------------
 * body.hpp
 *
 * Copyright (c) 2017 Yann Herklotz Grave <ymherklotz@gmail.com> -- MIT License
 * See file LICENSE for more details
 * ----------------------------------------------------------------------------
 */

#ifndef YAGE_BODY_HPP
#define YAGE_BODY_HPP

#include "Math/matrix.hpp"

namespace yage
{

class Body
{
public:
    // gravity constant
    static const double GRAVITY;    
protected:
    // center of mass of the object
    Vector2d position_=Vector2d(0, 0);

    // mass of the object
    double mass_=1;
    
    // current velocity of the object
    Vector2d velocity_=Vector2d(0, 0);

    // boolean that defines if gravity can act on the object
    bool gravity_=true;
    
    // current acceleration
    Vector2d acceleration_=Vector2d(0, 0);

    // force acting on the body
    Vector2d force_=Vector2d(0, 0);
    
public:
    virtual ~Body();

    // apply force to the object and update the velocity
    virtual void applyForce(const Vector2d &force)=0;
    virtual void update()=0;

    double xPosition() const;
    double yPosition() const;
protected:
    // protected constructor to initialize member variables
    Body(const Vector2d &position=Vector2d(0, 0),
         double mass=1,
         const Vector2d &velocity=Vector2d(0, 0),
         bool gravity=false);
};

} // yage

#endif