class CFont {
private:
	UINT m_FontListID; // holds the ID for the display list used to create the font 

	HFONT m_hOldFont; // holds the old font so that there''s no memory leaks

	int m_Height; // the height of the font


public:
	CFont(); // initializes the variables

	~CFont(); // cleans up the class


        // creates the font

	void CreateOpenGLFont(HDC hDC, LPSTR fontName, int height=32, BOOL underlined=FALSE, BOOL italicized=FALSE);

        // positions the text, used in the WriteText method

	void PositionText(int x, int y, int screenHeight);

        // writes the text in position (x,y), screen height is the height of the window in pixels

	void WriteText(int x, int y, int screenHeight, const char *string, ...);

        // destroys the font

	void DestroyFont(HDC hDC);

};

//-------------------------------------------------

// The Constructor and destructor

//-------------------------------------------------

CFont::CFont() {
	m_hOldFont = NULL;
	m_FontListID = 0;
}

CFont::~CFont() {
	m_hOldFont = NULL;
	m_FontListID = 0;
}

//-------------------------------------------------

// Creates the Font

//-------------------------------------------------

void CFont::CreateOpenGLFont(HDC hDC, LPSTR fontName, int height, BOOL underlined, BOOL italicized) {
	HFONT hFont;
	if(hDC == NULL) {
		return;
	}

	m_Height = height;

	m_FontListID = glGenLists(MAX_CHARS);
	hFont = CreateFont(-height,
					   0,
					   0,
					   0,
					   FW_BOLD,
					   italicized,
					   underlined,
					   FALSE,
					   ANSI_CHARSET,
				       OUT_TT_PRECIS,
					   CLIP_DEFAULT_PRECIS,
					   ANTIALIASED_QUALITY,
					   FF_DONTCARE|DEFAULT_PITCH,
					   fontName);

	m_hOldFont = (HFONT)SelectObject(hDC,hFont);
	
	wglUseFontBitmaps(hDC,0,MAX_CHARS-1, m_FontListID);
}

//--------------------------------------------------

// Position the text

//--------------------------------------------------

void CFont::PositionText(int x, int y, int screenHeight) {
	glPushAttrib(GL_TRANSFORM_BIT | GL_VIEWPORT_BIT);

	glMatrixMode(GL_PROJECTION);
	glPushMatrix();
	glLoadIdentity();

	glMatrixMode(GL_MODELVIEW);
	glPushMatrix();
	glLoadIdentity();

	// makes it so that y = 0 is at the top of the screen, not the bottom

	y = screenHeight - m_Height - y;

	glViewport(x-1,y-1,0,0);

	glRasterPos4f(0,0,0,1);

	glPopMatrix();

	glMatrixMode(GL_PROJECTION);
	glPopMatrix();

	glPopAttrib();
}

//-------------------------------------------------

// writes teh text on the screen

//-------------------------------------------------

void CFont::WriteText(int x, int y, int screenHeight, const char *string,...) {
	char text[256];
	va_list argumentPtr;

	if(string == NULL) {
		return;
	}

	va_start(argumentPtr,string);
		vsprintf(text,string,argumentPtr);
	va_end(argumentPtr);

	PositionText(x,y,screenHeight);

	glPushAttrib(GL_LIST_BIT);
		glListBase(m_FontListID);
		glCallLists(strlen(text),GL_UNSIGNED_BYTE,text);
	glPopAttrib();
}

//-------------------------------------------------

// destroys the fonts and cleans up everything

//-------------------------------------------------

void CFont::DestroyFont(HDC hDC) {
	glDeleteLists(m_FontListID,MAX_CHARS);
	SelectObject(hDC,m_hOldFont);
}