TouchPanGesture.h

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

#pragma once

#include "AppInterface.h"
#include "VectorMath.h"
#include "IEmscriptenInputHandler.h"
#include "InputEvents.h"
#include <map>

namespace Eegeo
{
    namespace Emscripten
    {
        namespace Input
        {
            class TouchPanGesture
            {
            private:
                IEmscriptenInputHandler* m_pHandler;
                bool m_panning;
                std::map<long, Eegeo::v2> m_inputMap;

                Eegeo::v2 m_panCenter;
                Eegeo::v2 m_panAnchor;
                float m_majorScreenDimension;

                Eegeo::v2 GetTouchExtents(const TouchInputEvent& event) const;
                void PopulatePanData(int numTouches, const v2& touchExtents, AppInterface::PanData& out_panData) const;

            public:
                TouchPanGesture(IEmscriptenInputHandler* pHandler, const float screenWidth, const float screenHeight);

                void PointerDown(const TouchInputEvent& event);
                void PointerUp(const TouchInputEvent& event);
                void PointerMove(const TouchInputEvent& event);

                void NotifyScreenPropertiesChanged(int screenWidth, int screenHeight);
            };
        }
    }
}