EnvironmentFlatteningService.h

// Copyright eeGeo Ltd (2012-2014), All Rights Reserved

#pragma once

#include "Types.h"
#include "Rendering.h"
#include "VectorMathDecl.h"
#include "ICallback.h"
#include "CallbackCollection.h"
#include "EnvironmentFlatteningConfiguration.h"

namespace Eegeo
{
    namespace Rendering
    {
        class EnvironmentFlatteningService : Eegeo::NonCopyable
        {
        public:
            static const float DefaultNormalScale;

            EnvironmentFlatteningService(const EnvironmentFlatteningConfiguration& config);
            
            void ToggleFlattened();
            void Update(float dt);
            
            void SetIsFlattened(bool isFlattened);

            bool IsFlattened() const;

            float GetCurrentScale() const;

            float GetFlattenedScale() const;
            
            static dv3 GetScaledPointEcef(const dv3& pointEcef, float environmentScale);
            static dv3 GetScaledPointAboveGroundEcef(const dv3& pointEcef, float heightAboveGround, float environmentScale);
            
            void InsertChangedCallback(Eegeo::Helpers::ICallback0& callback);
            void RemoveChangedCallback(Eegeo::Helpers::ICallback0& callback);


            enum EasingType
            {
                PennerInOutBack,
                Linear,
                SmoothStep,
            };

            static const float DefaultEaseDurationSeconds;

            static const float DefaultFlatScale;

            void SetCurrentScale(float scale);

            void SetEasingType(EasingType easingType);

            void SetEaseDuration(float easeDurationSeconds);

            void SetFlattenedScale(float scaleWhenFlattened);

        private:
            float CalculateScale() const;

            // todo - make properties const once deprecated mutation methods are removed
            float m_scaleWhenFlattened;
            EnvironmentFlatteningEasing::Type m_easingType;
            float m_easeDurationSeconds;

            // canonical state
            bool m_isFlattened;
            bool m_legacyManualScale;
            float m_interpParam;

            // auxiliary state
            float m_scale;

            Eegeo::Helpers::CallbackCollection0 m_changedCallbacks;
        };
    }
}