#pragma once

class SGameAvatarTerrainDegree
{
private:
		float						m_fAngleX, m_fAngleY;
		float						m_fPrevAngleX, m_fPrevAngleY;
		float						m_fCurrentAngleX, m_fCurrentAngleY;
		DWORD						m_dwAngleTime;
		bool						m_bReset;
public:
		float GetAngleX() { return m_fAngleX; }
		float GetAngleY() { return m_fAngleY; }

		float GetCurrentAngleX() { return m_fCurrentAngleX; }
		float GetCurrentAngleY() { return m_fCurrentAngleY; }

		/// 이전 각과 비교하자
		bool CheckPrevAngle()	{ return (m_fAngleX != m_fPrevAngleX || m_fAngleY != m_fPrevAngleY); }

		void ClearReset()
		{
			m_bReset	=	false;
		}

		void Reset( DWORD time )
		{
			if( m_bReset ) return;

			m_bReset		=	true;

			m_fAngleX		=	3.1415926f/2;
			m_fAngleY		=	3.1415926f/2;

			m_fPrevAngleX	=	m_fCurrentAngleX;
			m_fPrevAngleY	=	m_fCurrentAngleY;

			m_dwAngleTime	=	time;
		}

		void CalcCurrentAngle( DWORD time ) 
		{ 
			m_fCurrentAngleX	=	m_fPrevAngleX + (m_fAngleX - m_fPrevAngleX) * (time - m_dwAngleTime) / 100.0f;
			m_fCurrentAngleY	=	m_fPrevAngleY + (m_fAngleY - m_fPrevAngleY) * (time - m_dwAngleTime) / 100.0f;

			if( (float)(time - m_dwAngleTime)  > 100.0f )
			{
				m_fCurrentAngleX	=	m_fPrevAngleX	=	m_fAngleX;
				m_fCurrentAngleY	=	m_fPrevAngleY	=	m_fAngleY;
			}
		}
		void CalcTerrainDegree( K3DVector & vTerrainNormal, DWORD time )
		{
			static K3DVector vXNormal	= K3DVector( -1.0f, 0.0f, 0.0f );
			static K3DVector vYNormal	= K3DVector(  0.0f, 1.0f, 0.0f );

			K3DVector vXCross	= CrossProduct( vXNormal, vTerrainNormal );
			K3DVector vYCross	= CrossProduct( vYNormal, vTerrainNormal );

			m_fAngleX			= DotProduct( vXNormal, vTerrainNormal );
			m_fAngleY			= DotProduct( vYNormal, vTerrainNormal );
		
			if( vXCross.y < 0.0f )	m_fAngleX =  -acosf( m_fAngleX );
			else					m_fAngleX =  acosf( m_fAngleX );

			if( vYCross.x < 0.0f )	m_fAngleY =  -acosf( m_fAngleY );
			else					m_fAngleY =  acosf( m_fAngleY );

			m_fPrevAngleX	=	m_fCurrentAngleX;
			m_fPrevAngleY	=	m_fCurrentAngleY;

			m_dwAngleTime	=	time;

			ClearReset();
		}
public:
	SGameAvatarTerrainDegree() : m_fAngleX(0.0f), m_fAngleY(0.0f),
								 m_fPrevAngleX(0.0f), m_fPrevAngleY(0.0f),
								 m_fCurrentAngleX(0.0f), m_fCurrentAngleY(0.0f),
								 m_dwAngleTime(0),
								 m_bReset( false )
	{}
	~SGameAvatarTerrainDegree()
	{}
};