ccamera.cpp

HeightMap_D3D

//-----------------------------------------------------------------------------
// File: cCamera.cpp
// Desc: Camera class funcs are defined here.
//-----------------------------------------------------------------------------
#include "Main.h"




//-----------------------------------------------------------------------------
// Func: cCamera()
// Desc: Constructor of our cCamera Class.
//-----------------------------------------------------------------------------
cCamera::cCamera()
{
	vEyePt = D3DXVECTOR3( 0.0f, 0.0f, -50.0f );
	vLookAtPt = D3DXVECTOR3( 0.0f, 0.0f, 0.0f );
	vUpVec = D3DXVECTOR3( 0.0f, 1.0f, 0.0f );
	fSpeed = 0.25f;
}




//-----------------------------------------------------------------------------
// Func: Render()
// Desc: Render function. calling for move() and rotate() before rendering.
//-----------------------------------------------------------------------------
HRESULT cCamera::Render()
{
	if(FAILED(Rotate()))
	{
		MessageBox( hWnd, "Rotate() Failed!", "cCamera::Render()", MB_OK );
		return E_FAIL;
	}

	if(FAILED(Move()))
	{
		MessageBox( hWnd, "Move() Failed!", "cCamera::Render()", MB_OK );
		return E_FAIL;
	}

	D3DXMatrixLookAtLH( &matView, &vEyePt, &vLookAtPt, &vUpVec );
	g_pApp->m_pD3DDevice->SetTransform( D3DTS_VIEW, &matView );

	D3DXMatrixPerspectiveFovLH( &matProj, D3DX_PI/4, 1.0f, 1.0f, 1000.0f );
	g_pApp->m_pD3DDevice->SetTransform( D3DTS_PROJECTION, &matProj );

	char FontBuffer[255];
	sprintf(FontBuffer, "vEyePt(%f, %f, %f)", vEyePt.x, vEyePt.y, vEyePt.z );
	if(FAILED(g_pApp->RenderFont( FontBuffer, 12 )))
	{
		MessageBox(hWnd, "g_pApp->RenderFont( FontBuffer, 12 ) Failed!", "cCamera::Render()", MB_OK);
		return E_FAIL;
	}

	sprintf(FontBuffer, "vLookAtPt(%f, %f, %f)", vLookAtPt.x, vLookAtPt.y, vLookAtPt.z );
	if(FAILED(g_pApp->RenderFont( FontBuffer, 24 )))
	{
		MessageBox(hWnd, "g_pApp->RenderFont( FontBuffer, 24 ) Failed!", "cCamera::Render()", MB_OK);
		return E_FAIL;
	}

	sprintf(FontBuffer, "vUpVec(%f, %f, %f)", vUpVec.x, vUpVec.y, vUpVec.z );
	if(FAILED(g_pApp->RenderFont( FontBuffer, 36 )))
	{
		MessageBox(hWnd, "g_pApp->RenderFont( FontBuffer, 36 ) Failed!", "cCamera::Render()", MB_OK);
		return E_FAIL;
	}
}




//-----------------------------------------------------------------------------
// Func: Move()
// Desc: Moving the camera vEyePt and vLookAtPt by checking the keyboard input.
//-----------------------------------------------------------------------------
HRESULT cCamera::Move()
{
	D3DXVECTOR3 vDirectPt;
	D3DXVec3Normalize(&vDirectPt, &(vLookAtPt - vEyePt));

	if(SUCCEEDED(g_pApp->m_pInput->BKeyDown(DIK_W)))
	{
		if(SUCCEEDED(g_pApp->m_pInput->BKeyDown(DIK_LSHIFT)))
		{
			vEyePt += vDirectPt*(fSpeed * 4);
			vLookAtPt += vDirectPt*(fSpeed * 4);
		}
		else
		{
			vEyePt += vDirectPt*fSpeed;
			vLookAtPt += vDirectPt*fSpeed;
		}
	}

	if(SUCCEEDED(g_pApp->m_pInput->BKeyDown(DIK_S)))
	{
		if(SUCCEEDED(g_pApp->m_pInput->BKeyDown(DIK_LSHIFT)))
		{
			vEyePt -= vDirectPt*(fSpeed * 4);
			vLookAtPt -= vDirectPt*(fSpeed * 4);
		}
		else
		{
			vEyePt -= vDirectPt*fSpeed;
			vLookAtPt -= vDirectPt*fSpeed;
		}
	}

	if(SUCCEEDED(g_pApp->m_pInput->BKeyDown(DIK_A)))
	{
		D3DXVec3Cross( &vDirectPt, &vDirectPt, &vUpVec );
		D3DXVec3Normalize( &vDirectPt, &vDirectPt );

		if(SUCCEEDED(g_pApp->m_pInput->BKeyDown(DIK_LSHIFT)))
		{
			vEyePt += vDirectPt*(fSpeed * 4);
			vLookAtPt += vDirectPt*(fSpeed * 4);
		}
		else
		{
			vEyePt += vDirectPt*fSpeed;
			vLookAtPt += vDirectPt*fSpeed;
		}
	}

	if(SUCCEEDED(g_pApp->m_pInput->BKeyDown(DIK_D)))
	{
		D3DXVec3Cross( &vDirectPt, &vDirectPt, &vUpVec );
		D3DXVec3Normalize( &vDirectPt, &vDirectPt );

		if(SUCCEEDED(g_pApp->m_pInput->BKeyDown(DIK_LSHIFT)))
		{
			vEyePt -= vDirectPt*(fSpeed * 4);
			vLookAtPt -= vDirectPt*(fSpeed * 4);
		}
		else
		{
			vEyePt -= vDirectPt*fSpeed;
			vLookAtPt -= vDirectPt*fSpeed;
		}
	}
	return S_OK;
}




//-----------------------------------------------------------------------------
// Func: Rotate()
// Desc: Rotating the camera vLookAtPt and vUpVec around the axis by checking
//		 the mouse input.
//-----------------------------------------------------------------------------
HRESULT cCamera::Rotate()
{
	D3DXVECTOR3 vDirectPt, vRotAxisPt;
	D3DXMATRIX matRotX, matRotY, matRotZ;

	D3DXVec3Normalize( &vRotAxisPt, &( vLookAtPt - vEyePt ) );
	D3DXVec3Cross( &vRotAxisPt, &vRotAxisPt, &vUpVec );
	D3DXVec3Normalize( &vRotAxisPt, &vRotAxisPt );


	D3DXMatrixRotationAxis( &matRotX, &vRotAxisPt, (FLOAT)g_pApp->m_pInput->getM_BuffY()/( -360 ) );
	D3DXMatrixRotationZ( &matRotZ, (FLOAT)g_pApp->m_pInput->getM_BuffX()/( -360 ) );

	D3DXVec3TransformCoord( &vDirectPt, &( vLookAtPt - vEyePt ), &matRotX );
	D3DXVec3TransformCoord( &vUpVec, &vUpVec, &matRotX );
	vLookAtPt = vDirectPt + vEyePt;

	D3DXVec3TransformCoord( &vDirectPt, &( vLookAtPt - vEyePt ), &matRotZ );
	D3DXVec3TransformCoord( &vUpVec, &vUpVec, &matRotZ );
	vLookAtPt = vDirectPt + vEyePt;
	return S_OK;
}