Collider2.h

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/*************************************************************************
> File Name: Collider2.h
> Project Name: CubbyFlow
> Author: Chan-Ho Chris Ohk
> Purpose: Abstract base class for generic collider object.
> Created Time: 2017/05/09
> Copyright (c) 2018, Chan-Ho Chris Ohk
*************************************************************************/
#ifndef CUBBYFLOW_COLLIDER2_H
#define CUBBYFLOW_COLLIDER2_H

#include <Core/Surface/Surface2.h>

#include <functional>

namespace CubbyFlow
{
    class Collider2
    {
    public:
        using OnBeginUpdateCallback = std::function<void(Collider2*, double, double)>;

        Collider2();

        virtual ~Collider2();

        virtual Vector2D VelocityAt(const Vector2D& point) const = 0;

        void ResolveCollision(double radius, double restitutionCoefficient, Vector2D* position, Vector2D* velocity);

        double GetFrictionCoefficient() const;

        void SetFrictionCoefficient(double newFrictionCoeffient);

        const Surface2Ptr& GetSurface() const;

        void Update(double currentTimeInSeconds, double timeIntervalInSeconds);

        void SetOnBeginUpdateCallback(const OnBeginUpdateCallback& callback);

    protected:
        struct ColliderQueryResult final
        {
            double distance;
            Vector2D point;
            Vector2D normal;
            Vector2D velocity;
        };

        void SetSurface(const Surface2Ptr& newSurface);

        void GetClosestPoint(const Surface2Ptr& surface, const Vector2D& queryPoint, ColliderQueryResult* result) const;

        bool IsPenetrating(const ColliderQueryResult& colliderPoint, const Vector2D& position, double radius);

    private:
        Surface2Ptr m_surface;
        double m_frictionCoeffient = 0.0;
        OnBeginUpdateCallback m_onUpdateCallback;
    };

    using Collider2Ptr = std::shared_ptr<Collider2>;
}

#endif