#include <d3d9.h>
#include <d3dx9.h>
#include "Camera.h"

// 構造函數
Camera::Camera()
{
	D3DXVECTOR3	eye(-350.0f,450.0f,0.0f);
	D3DXVECTOR3	lookat(0.0f,0.0f,0.0f);
	D3DXVECTOR3	up(0.0f,1.0f,0.0f);
	D3DXMatrixIdentity( &m_matView );
	SetView( &eye, &lookat, &up );
}

///設置矩陣.
D3DXMATRIXA16*	Camera::SetView( D3DXVECTOR3* pvEye,D3DXVECTOR3* pvLookat,D3DXVECTOR3* pvUp)
{
	m_vEye		= *pvEye;
	m_vLookat	= *pvLookat;
	m_vUp		= *pvUp;
	D3DXVec3Normalize( &m_vView, &( m_vLookat - m_vEye ) );
	D3DXVec3Cross( &m_vCross, &m_vUp, &m_vView );

	D3DXMatrixLookAtLH( &m_matView, &m_vEye, &m_vLookat, &m_vUp);


	return &m_matView;
}

D3DXMATRIXA16* Camera::RotateLocalX( float angle )
{
	D3DXMATRIXA16 matRot;
	D3DXMatrixRotationAxis( &matRot, &m_vCross, angle );

	D3DXVECTOR3 vNewDst;
	D3DXVec3TransformCoord( &vNewDst, &(m_vEye-m_vLookat), &matRot );	

	vNewDst += m_vLookat;										

	return SetView( &vNewDst, &m_vLookat, &m_vUp );
}


D3DXMATRIXA16* Camera::RotateLocalY( float angle )
{
	D3DXMATRIXA16 matRot;
	D3DXMatrixRotationAxis( &matRot, &m_vUp, angle );

	D3DXVECTOR3 vNewDst;
	D3DXVec3TransformCoord( &vNewDst, &(m_vEye-m_vLookat), &matRot );	
	vNewDst += m_vLookat;										

	return SetView( &vNewDst, &m_vLookat, &m_vUp );
}