DtPinchGesture.h

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/****************************************************************************** 
** Copyright (c) 2015 MAK Technologies, Inc. 
** All rights reserved. 
******************************************************************************/ 
 

#pragma once

#include <vrvCore/vrvCore.h>

#include <vrvGraphicsUtils/DtLine2D.h>

namespace makVrv 
{ 
   class DT_DLL_VRVCORE DtPinchGesture
   {
   public:

      typedef DtVector2<float32> DtVector2f;
      typedef DtLine2D<float32> DtLine2f;

      enum PinchGestureState
      {
           PinchGestureStateUnspecified
         , PinchGestureStateBegin
         , PinchGestureStateUpdate
         , PinchGestureStateEnd
      };

      DtPinchGesture();

      DtPinchGesture( const DtPinchGesture& orig );

      DtPinchGesture& operator=(  const DtPinchGesture& rhs );

      virtual ~DtPinchGesture();

      virtual PinchGestureState gestureState() const;

      virtual void setGestureState( PinchGestureState gestureState );


      virtual float scaleFactor() const;

      virtual float lastScaleFactor() const;

      virtual float totalScaleFactor() const;

      virtual float rotationAngle() const;
      
      virtual float lastRotationAngle() const;

      virtual float totalRotationAngle() const;

      virtual DtVector2f startCenterPoint() const;

      virtual DtVector2f centerPoint() const;

      virtual DtVector2f lastCenterPoint() const;

      virtual void processTouchEvent( PinchGestureState gestureState,
         const DtVector2f& p0, const DtVector2f& p1 );

   protected:

      virtual void computeCurrentScaleFactor( PinchGestureState gestureState,
         const DtVector2f& p0, const DtVector2f& p1 );

   protected:
      bool myInitialized;
      PinchGestureState myGestureState;

      DtLine2f myStartLine;
      DtLine2f myLastLine;

      float myScaleFactor;
      float myLastScaleFactor;
      float myTotalScaleFactor;

      float myRotationAngle;
      float myLastRotationAngle;
      float myTotalRotationAngle;

      DtVector2f myCenterPoint;
      DtVector2f myStartCenterPoint;
      DtVector2f myLastCenterPoint;
   };
}