TouchPinchGesture.h

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

#pragma once

#include "IEmscriptenInputHandler.h"
#include "InputEvents.h"

namespace Eegeo
{
    namespace Emscripten
    {
        namespace Input
        {
            class TouchPinchGesture
            {
            private:
                IEmscriptenInputHandler* m_pHandler;
                bool m_pinching;
                float m_previousDistance;
                float m_majorScreenDimension;

                bool UpdatePinching(bool pinching, const TouchInputEvent& event, float& pinchScale, int numTouches, bool pointerUp);

            public:
                TouchPinchGesture(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);
            };
        }
    }
}