// Zong!

// Author: Adrian Walker

// Date: June 27, 2002 ... early morning


#define WIN32_LEAN_AND_MEAN

// the main windows includes

#include <windows.h>
#include <stdlib.h>

void DrawBat();				// draws the bat

void DrawBall( HDC hDC );	// draws the ball

void MoveBall();			// moves the ball

void DrawScore();			// draws the score

void Pause( int MilliSecs ); // pause function


int GameInit();				// initialization

int GameLoop();				// the game loop

int GameShutDown();			// shutdown


// constants for variables in pixels

const int BAT_WIDTH = 10;		
const int BAT_HEIGHT = 50;
const int BAT_INITIAL_X = 15;
const int BAT_SPEED = 6;
const int BALL_SPEED = 3;
const int BALL_RADIUS = 7;

// variable holding the speed of the ball

int g_BallSpeed = BALL_SPEED;

// used for redrawing code

BOOL g_bRedrawBat = TRUE;
BOOL g_bRedrawBall = TRUE;

// the score holder, initialized to three

int g_Score = 3;

// a glocal device context because we're drawing alot

HDC g_hWndMain;

// a structure to hold info about the ball

typedef struct
{
	int x, y;		// position

	int radius;		// size

}BALL, *PBALL;

// a structure to hold info about the bat

typedef struct
{
	int x, y;		// position

	int Width, Height; // size

}BAT, *PBAT;

// the global bat structure

BAT g_BAT;
// the global ball structure

BALL g_BALL;


// the windows procedure to handle events

long CALLBACK WndProc( HWND hWnd, UINT uMessage,
					  WPARAM wParam, LPARAM lParam )
{
	PAINTSTRUCT PaintStruct;		// struture used during windows painting

	HDC hDC;						// handle to device context for painting


	// handle to the background bitmap

	static HBITMAP hBitmap = 0;

	// switch the windows message to figure out what it is

	switch( uMessage )
	{
	
	case WM_CREATE:			// the CreateWindows() was just called

		{
			// load the background bitmap

			hBitmap = (HBITMAP)LoadImage( 0, "ZONG.BMP", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE );
			return 0;
		}
	
	case WM_KEYDOWN:
		{
			switch( wParam )
			{
				// exit if the escape key is pressed

			case VK_ESCAPE:
				{
					if( MessageBox( g_hWndMain,
						"Do you really want to quit the game of the great ones?",
						"Bye Bye", MB_YESNO ) == IDYES )
					PostMessage( g_hWndMain, WM_DESTROY, 0, 0 );
					break;
				}
			}
			return 0;
		}

	case WM_PAINT:	// redraw the background bitmap

		{
			// tell windows we want to start updating the window

			hDC = BeginPaint( hWnd, &PaintStruct );

			// structure to hold info about the bitmap

			BITMAP Bitmap;

			// get information about the bitmap

			GetObject( hBitmap, sizeof( BITMAP ), &Bitmap );

			// create a compatible DC for the bitmap

			HDC hBitmapDC = CreateCompatibleDC( hDC );

			// select the bitmap into the new DC

			SelectObject( hBitmapDC, hBitmap );

			// copy the bitmap to the main DC

			BitBlt( hDC, 0, 0, Bitmap.bmWidth, Bitmap.bmHeight, hBitmapDC, 0, 0, SRCCOPY );

			// get rid of the new DC

			DeleteDC( hBitmapDC );

			// tell windows we have finished updating the window

			EndPaint( hWnd, &PaintStruct );

			// the window has just been redrawn so we should not redraw the bat and ball

			// to erase the previous ones. They are already erased! Otherwise you get artifacts

			g_bRedrawBat = FALSE;
			g_bRedrawBall = FALSE;

			return 0;
		}

	case WM_DESTROY:	// the window is about to be closed

		{
			// delete the background bitmap

			DeleteObject( hBitmap );

			// our main window is closing, which means we want out app to exit

			// tell windows to put a WM_QUIT message in our message queue

			PostQuitMessage( 0 );
			return 0;
		}

	default:
		{
			// let windows handle this message

			return DefWindowProc( hWnd, uMessage, wParam, lParam );
		}
	}
}