BodyLabs/particles2/Contact.h

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#pragma once
#ifndef BL7_P2_CONTACT_H
#define BL7_P2_CONTACT_H

#include "../core.h"

#include <MathLabs/Vector2.h>



namespace bl7 {
namespace particles2 {



class Particle;
class ContactGenerator;
class ContactRegistry;
class ContactResolver;



class BODYLABS_API Contact
{

    // #############################################################################
    // Construction / Destruction
    // #############################################################################
public:
    ~Contact(void)
    { }

    Contact(const Contact& rhs)
        : _particle1( rhs._particle1 ), _particle2( rhs._particle2 )
        , _normal( rhs._normal ), _penetration( rhs._penetration ), _restitution( rhs._restitution )
        , _movement1( rhs._movement1 ), _movement2( rhs._movement2 )
    {
    }

    Contact& operator = (const Contact& rhs)
    {
        _particle1 = rhs._particle1;
        _particle2 = rhs._particle2;
        _normal = rhs._normal;
        _penetration = rhs._penetration;
        _restitution = rhs._restitution;
        _movement1 = rhs._movement1;
        _movement2 = rhs._movement2;
        return *this;
    }

    Contact(Particle* particle, const ml7::Vector2& normal, const float penetration, const float restitution)
        : _particle1( particle ), _particle2( NULL )
        , _normal( normal ), _penetration( penetration ), _restitution( restitution )
        , _movement1(), _movement2()
    { assert( particle ); }

    Contact(Particle* particle1, Particle* particle2, const ml7::Vector2& normal, const float penetration, const float restitution)
        : _particle1( particle1 ), _particle2( particle2 )
        , _normal( normal ), _penetration( penetration), _restitution( restitution )
        , _movement1(), _movement2()
    { assert( particle1 ); }

private:
    Contact(void)
    { }


    
    // #############################################################################
    // Attributes
    // #############################################################################
private:
    Particle* _particle1;

    Particle* _particle2;

    ml7::Vector2 _normal;

    float _penetration;

    float _restitution;

    ml7::Vector2 _movement1;

    ml7::Vector2 _movement2;



    // #############################################################################
    // Contact Resolution
    // #############################################################################
public:
    void resolve(const float time);

    void resolve_velocity(const float time);

    void resolve_position(const float time);

    float calculate_penetrating_speed() const;

private:
    float remove_acceleration_factor(const float speed, const float time) const;



    friend ContactGenerator;
    friend ContactRegistry;
    friend ContactResolver;

}; // class BODYLABS_API Contact



} // namespace particles2
} // namespace bl7

#endif // BL7_P2_CONTACT_H

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