// K3DCamera.h: interface for the K3DCamera class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_K3DCAMERA_H__87E8A41E_F986_4EB7_91BC_81EC2F3D414F__INCLUDED_)
#define AFX_K3DCAMERA_H__87E8A41E_F986_4EB7_91BC_81EC2F3D414F__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#include "K3DTypes.h"
//#include "K3DFrustum.h"
class KViewportObject;
//class K3DRenderDeviceDX;

/**
  K3DCamera class Description
  - This class sets view matrix and projection matrix to viewport when render is called.
  - Support pan (like side step), turn, elavation (vertical turn), zoom.
  - Need to call the Initialize Function before using this class. 
 */
class K3DCamera  
{
public:
	K3DCamera();
	~K3DCamera();

	/// Reset Camera Status.
	/**
	fov : 24 degree, near : 100, far : 50000 \n
	distance from target : 1500 , elvation : 1.57 / 2.0  (radian) - 45 degree \n
	Cam Pos x,y,z = {0, 1500 * sin45 degree,  1500 * cos45 degree} \n
	Target Pos = {0,0,0} Up Vector = { 0, 0 , 1}  \n
	*/
	void Reset();

	/// Initialize Camera
	void Initialize( float fov)
	{
		m_fFOV = fov;
	}

	void SetFOV( float fov )
	{
		m_fFOV = fov;
	}

	float GetFOV() const
	{
		return m_fFOV;
	}

	void SetCoordinateToRightHand()		{ m_bIsRightHandCoordinate = true; }
	void SetCoordinateToLeftHand()		{ m_bIsRightHandCoordinate = false; }
	bool IsCoordinateRightHand() const	{ return m_bIsRightHandCoordinate; }
	bool IsCoordinateLeftHand() const	{ return !m_bIsRightHandCoordinate; }

	void SetCameraPerspectiveMode()		{ m_bIsPerspective = true; }
	void SetCameraOrthogonalMode()		{ m_bIsPerspective = false; }
	bool IsCameraPerspectiveMode() const	{ return m_bIsPerspective; }
	bool IsCameraOrthogonalMode() const		{ return !m_bIsPerspective; }

	K3DVector GetCamPos() const
	{
		return K3DVector( m_fXPos, m_fYPos, m_fZPos );
	}
	void GetCamPos(float &x,float &y,float &z ) const
	{
		x = m_fXPos; y = m_fYPos; z = m_fZPos;
	}

	K3DVector GetCamOrgPos() const
	{
		return K3DVector( m_fOrgXPos, m_fOrgYPos, m_fOrgZPos );
	}

	void GetCamOrgPos(float &x,float &y,float &z ) const
	{
		x = m_fOrgXPos; y = m_fOrgYPos; z = m_fOrgZPos;
	}

	K3DVector GetTargetPos() const
	{
		return K3DVector( m_fTXPos, m_fTYPos, m_fTZPos );
	}

	void GetTargetPos(float &x,float &y,float &z ) const
	{
		x= m_fTXPos; y = m_fTYPos; z = m_fTZPos;
	}
	
	void SetCamPos( float x, float y, float z )
	{
		m_fXPos = x; m_fYPos = y; m_fZPos = z;
		m_fOrgXPos = m_fXPos;	m_fOrgYPos = m_fYPos;	m_fOrgZPos = m_fZPos;
	}

	void SetCurCamPos( float x, float y, float z )
	{
		m_fXPos = x; m_fYPos = y; m_fZPos = z;
	//	m_fOrgXPos = m_fXPos;	m_fOrgYPos = m_fYPos;	m_fOrgZPos = m_fZPos;
	}

	void SetOrgCamPos( float x, float y, float z )
	{
		m_fOrgXPos = x;	m_fOrgYPos = y;	m_fOrgZPos = z;
	}

	void SetCurCamPos(float fRatio)
	{
		if(fRatio <= 0.0f || fRatio > 1.0f) return;

		K3DVector vres;
		K3DVector v1(m_fTXPos, m_fTYPos, m_fTZPos);
		K3DVector v2(m_fOrgXPos, m_fOrgYPos, m_fOrgZPos);

		vres = v1 + (v2 - v1) * fRatio;

		m_fXPos = vres.x;
		m_fYPos = vres.y;
		m_fZPos = vres.z;
	}

	void SetTargetPos( float x, float y, float z )
	{
		m_fTXPos = x; m_fTYPos = y; m_fTZPos = z;
	}

	/// Set Panning(like side move)
	/**	
	Camera Pos = Vc, Target Pos = Vt, Argument Pos = Va \n
	Diff Vector Vd = Va - Vt, and new Vc = Vc + Vd \n 
	Setting Vt = Va \n 
	*/
	void SetPan( float x, float y, float z )
	{
		float dx = x - m_fTXPos;
		float dy = y - m_fTYPos;
		float dz = z - m_fTZPos;
		m_fXPos += dx;
		m_fYPos += dy;
		m_fZPos += dz;
		m_fOrgXPos += dx;
		m_fOrgYPos += dy;
		m_fOrgZPos += dz;
		m_fTXPos = x;
		m_fTYPos = y;
		m_fTZPos = z;
	}

	/// Get View matrix from Cam Pos, Target Pos
	/**	
	 @return K3DMatrix Pointer which denote View Matrix.     
	 */
	K3DMatrix *GetViewMatrix();
	//K3DMatrix *GetProjMatrix();

	void Point(float fXPos, float fYPos, float fZPos, float fTXPos, float fTYPos, float fTZPos);
	/// Set Elavation (Vetical Turn)
	/**	
	@param fAngle Radian Unit.
	This function will cause a problem if the value of fAngle becomes larger than \n
	(1.57) 90 degrees.\n
	(Because UPVector and SideVector going to be same direction.) \n
	*/
	void Elevation(float fAngle);
	/// Set Turn (Horizontal Turn)
	/**
	@param fAngle Radian Unit.
	*/
	void Turn(float fAngle);
	/// Pannig Camera
	/**
	@param dx,dy,dz : How you can get these panning arguments? 
	Some preprocessing is needed. See the below! \n \n
	K3DVector vtView = m_pCamera->GetViewVector(); \n
	K3DVector vtUp = m_pCamera->GetUpVector(); \n
	K3DVector vtRes = CrossProduct(vtView, vtUp); // Get Side Vector. \n
	Normalize(vtRes); \n
	vtUp = CrossProduct(vtRes, vtView); // Get appropriate UpVector. \n
	Normalize(vtUp);	\n
	If you need horizontal pannig, use vtRes. \n
	else if you need vertical panning, use vtUp. \n
	*/
	void Pan(float dx, float dy, float dz);
	/// 2010.11.11 카메라 방향에 맞게 - prodongi
	void PanWithCamDir(float dx, float dy, float dz);

	/// Zoom Camera
	/**	
    @param dist : The camera's distance will be descreased by dist value. And cam pos changed too.
	*/
	void Zoom(float dist);
	
	/// Get Camera's view vector ( Target Pos - Cam Pos)
	/**	
	@return Normalized Vt - Vc.
	*/
	K3DVector GetViewVector() const
	{
		K3DVector vtView = K3DVector(m_fTXPos - m_fXPos, m_fTYPos - m_fYPos, m_fTZPos - m_fZPos);
		Normalize(vtView);	
		return vtView;
	}

	K3DVector GetOrgViewVector() const
	{
		K3DVector vtView = K3DVector(m_fTXPos - m_fOrgXPos, m_fTYPos - m_fOrgYPos, m_fTZPos - m_fOrgZPos);
		Normalize(vtView);	
		return vtView;
	}
	
	K3DVector GetUpVector() const
	{
		return m_dxvtUp;
	}
	
	void SetUpVector(float x, float y, float z)
	{
		m_dxvtUp = K3DVector(x,y,z);
	}
	
	/// Get Distance between Cam Pos and Target Pos.
	/**	
	@return ||Vt - Vc|| + 0.5f
	*/
	float GetDistance()
	{
		m_fDistance = sqrtf( powf(m_fXPos - m_fTXPos, 2) +
			powf(m_fYPos - m_fTYPos, 2) +
			powf(m_fZPos - m_fTZPos,2) ) + .5f;
		
		return m_fDistance;
	}
	/// Render this camera.
	/**	
	* It will set view Matrix and projection Matrix to viewport.
	*/
	//void Render( KViewportObject *viewport, bool bOffSet = false );

	/// Get two vertex from near clip point and far clip point.
	/*!
	Compute line which is linked from near clip to far clip.
	@param srcx, srcy (in) : Screen coordinate. 
	@param vNear (out) : 3D point in near clipping plane.
	@param vFar (out) : 3D point in far clipping plane.
	*/
	//void GetLineFromScreen( KViewportObject* pViewport, int scrx, int scry, K3DVector *vNear, K3DVector *vFar ) const;
	//void GetScreenPosition( KViewportObject* pViewport, const K3DVector & vWorldPos, int *pPosX, int *pPosY);
	//void GetFrustumCube( KViewportObject* pViewport, const KViewportStruct& rViewPort, int nMarginX, int nMarginY, K3DVertex* pFrustumCube ) const;

	//
	void SetMinDistance( float fMinDistance ) { m_fMinDistance = fMinDistance; m_bUseMinDistance=true; }

	//K3DVector* GetFrustum(KViewportObject* pViewport);

	void FileTextOut( FILE* pF );
	void FileTextIn( char *pBuf );

private:
	//void _MakeFrustum(KViewportObject* pViewport);

	//K3DFrustum	m_Frustum;

	bool m_bIsRightHandCoordinate;
	bool m_bIsPerspective;

	float m_fFOV;
	float m_fXPos, m_fYPos, m_fZPos;
	float m_fOrgXPos, m_fOrgYPos, m_fOrgZPos;
	float m_fTXPos, m_fTYPos, m_fTZPos;
	float m_fZoomDelta;

	K3DVector m_dxvtUp;

	float m_fElavation;
	float m_fTurn;
	float m_fDistance;

	bool  m_bUseMinDistance;
	float m_fMinDistance;

	K3DMatrix m_MatView;
//	K3DMatrix m_matProjection;

	K3DMatrix m_OffSetMatView;

	K3DVALUE  m_fValue; ///< 제한 각
};	

#endif // !defined(AFX_K3DCAMERA_H__87E8A41E_F986_4EB7_91BC_81EC2F3D414F__INCLUDED_)