i_physical_object.hpp

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// i_physical_object.hpp
/*
  neogfx C++ GUI Library
  Copyright (c) 2015 Leigh Johnston.  All Rights Reserved.
  
  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 3 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, see <http://www.gnu.org/licenses/>.
*/
#pragma once

#include <neogfx/neogfx.hpp>
#include <chrono>
#include <boost/optional.hpp>
#include <neogfx/core/geometrical.hpp>
#include <neogfx/game/chrono.hpp>
#include "i_collidable_object.hpp"

namespace neogfx
{
    class i_physical_object : public virtual i_collidable_object
    {
        // types
    public:
        typedef scalar time_interval;
        typedef boost::optional<time_interval> optional_time_interval;
        typedef int64_t step_time_interval;
        typedef boost::optional<step_time_interval> optional_step_time_interval;
        // lifetime
    public:
        virtual ~i_physical_object() {}
        // physics
    public:
        virtual vec3 origin() const = 0;
        virtual vec3 position() const = 0;
        virtual vec3 angle_radians() const = 0;
        virtual vec3 angle_degrees() const = 0;
        virtual vec3 velocity() const = 0;
        virtual vec3 acceleration() const = 0;
        virtual vec3 spin_radians() const = 0;
        virtual vec3 spin_degrees() const = 0;
        virtual scalar mass() const = 0;
        virtual void set_origin(const vec3& aOrigin) = 0;
        virtual void set_position(const vec3& aPosition) = 0;
        virtual void set_angle_radians(const vec3& aAngle) = 0;
        virtual void set_angle_degrees(const vec3& aAngle) = 0;
        virtual void set_velocity(const vec3& aVelocity) = 0;
        virtual void set_acceleration(const vec3& aAcceleration) = 0;
        virtual void set_spin_radians(const vec3& aSpin) = 0;
        virtual void set_spin_degrees(const vec3& aSpin) = 0;
        virtual void set_mass(scalar aMass) = 0;
        // object
    public:
        virtual void clear_vertices_cache() = 0;
        virtual bool update(const optional_time_interval& aNow, const vec3& aForce) = 0;
        virtual const optional_time_interval& update_time() const = 0;
        virtual void set_update_time(const optional_time_interval& aLastUpdateTime) = 0;
        // helpers
    public:
        void set_angle_radians(scalar aAngle)
        {
            set_angle_radians(vec3{ 0.0, 0.0, aAngle });
        }
        void set_angle_degrees(scalar aAngle)
        {
            set_angle_degrees(vec3{ 0.0, 0.0, aAngle });
        }
        void set_spin_radians(scalar aSpin)
        {
            set_spin_radians(vec3{ 0.0, 0.0, aSpin });
        }
        void set_spin_degrees(scalar aSpin)
        {
            set_spin_degrees(vec3{ 0.0, 0.0, aSpin });
        }
    };

    inline rect to_rect(const aabb& aAabb)
    {
        return rect{ point{aAabb.min.x, aAabb.min.y}, point{ aAabb.max.x, aAabb.max.y } };
    }

    inline i_physical_object::step_time_interval to_step_time(i_physical_object::time_interval aTime, i_physical_object::step_time_interval aStepInterval)
    {
        auto fs = chrono::to_flicks(aTime).count();
        return fs - (fs % aStepInterval);
    }

    inline i_physical_object::step_time_interval to_step_time(const i_physical_object::optional_time_interval& aTime, i_physical_object::step_time_interval aStepInterval)
    {
        if (aTime)
            return to_step_time(*aTime, aStepInterval);
        else
            return 0;
    }

    inline i_physical_object::time_interval from_step_time(i_physical_object::step_time_interval aStepTime)
    {
        return chrono::to_seconds(chrono::flicks{ aStepTime });
    }
}