Windows Game Programming for Dummies (2nd Edition)/WinGamProgFD.iso/pc/Source/GPCHAP17/PROG17_1.CPP

C/C++ Source or Header | 2002-05-01 | 9.7 KB | 387 lines

// PROG17_1.CPP - constant velocity demo
// to compile make sure to include DDRAW.LIB, DSOUND.LIB,
// DINPUT.LIB, DINPUT8.LIB, WINMM.LIB, and of course GPDUMB I and II files.

// INCLUDES ///////////////////////////////////////////////

#define WIN32_LEAN_AND_MEAN
#define INITGUID

#include <windows.h>   // include important windows stuff
#include <windowsx.h>
#include <mmsystem.h>
#include <iostream.h> // include important C/C++ stuff
#include <conio.h>
#include <stdlib.h>
#include <malloc.h>
#include <memory.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include <math.h>
#include <io.h>
#include <fcntl.h>

#include <ddraw.h>  // directX includes
#include <dsound.h>
#include <dinput.h>
#include "gpdumb1.h" // game library includes
#include "gpdumb2.h"

// DEFINES ////////////////////////////////////////////////

// defines for windows
#define WINDOW_CLASS_NAME "WINXCLASS"  // class name

#define WINDOW_WIDTH    320   // size of window
#define WINDOW_HEIGHT   240

#define NUM_CHOPPERS    16   // number of choppers in simulation

// PROTOTYPES /////////////////////////////////////////////

// game console
int Game_Init(void *parms=NULL);
int Game_Shutdown(void *parms=NULL);
int Game_Main(void *parms=NULL);

// GLOBALS ////////////////////////////////////////////////

HWND main_window_handle           = NULL; // save the window handle
HINSTANCE main_instance           = NULL; // save the instance
char buffer[80];                          // used to print text

BITMAP_IMAGE background_bmp;   // holds the background
BOB          chopper[16];      // the fleet

int sound_id = -1;             // general sound

// FUNCTIONS //////////////////////////////////////////////

LRESULT CALLBACK WindowProc(HWND hwnd,
                            UINT msg,
                            WPARAM wparam,
                            LPARAM lparam)
{
// this is the main message handler of the system
PAINTSTRUCT    ps;           // used in WM_PAINT
HDC            hdc;       // handle to a device context

// what is the message
switch(msg)
    {
    case WM_CREATE:
        {
        // do initialization stuff here
        return(0);
        } break;

    case WM_PAINT:
         {
         // start painting
         hdc = BeginPaint(hwnd,&ps);

         // end painting
         EndPaint(hwnd,&ps);
         return(0);
        } break;

    case WM_DESTROY:
        {
        // kill the application
        PostQuitMessage(0);
        return(0);
        } break;

    default:break;

    } // end switch

// process any messages that we didn't take care of
return (DefWindowProc(hwnd, msg, wparam, lparam));

} // end WinProc

// WINMAIN ////////////////////////////////////////////////

int WINAPI WinMain(    HINSTANCE hinstance,
                    HINSTANCE hprevinstance,
                    LPSTR lpcmdline,
                    int ncmdshow)
{
// this is the winmain function

WNDCLASS winclass;    // this will hold the class we create
HWND     hwnd;        // generic window handle
MSG         msg;        // generic message
HDC      hdc;       // generic dc
PAINTSTRUCT ps;     // generic paintstruct

// first fill in the window class stucture
winclass.style            = CS_DBLCLKS | CS_OWNDC |
                          CS_HREDRAW | CS_VREDRAW;
winclass.lpfnWndProc    = WindowProc;
winclass.cbClsExtra        = 0;
winclass.cbWndExtra        = 0;
winclass.hInstance        = hinstance;
winclass.hIcon            = LoadIcon(NULL, IDI_APPLICATION);
winclass.hCursor        = LoadCursor(NULL, IDC_ARROW);
winclass.hbrBackground    = (HBRUSH)GetStockObject(BLACK_BRUSH);
winclass.lpszMenuName    = NULL;
winclass.lpszClassName    = WINDOW_CLASS_NAME;

// register the window class
if (!RegisterClass(&winclass))
    return(0);

// create the window, note the use of WS_POPUP
if (!(hwnd = CreateWindow(WINDOW_CLASS_NAME, // class
                          "WinX Game Console",     // title
                          WS_POPUP | WS_VISIBLE,
                           0,0,       // x,y
                          WINDOW_WIDTH,  // width
                          WINDOW_HEIGHT, // height
                          NULL,       // handle to parent
                          NULL,       // handle to menu
                          hinstance,// instance
                          NULL)))    // creation parms
return(0);

// save the window handle and instance in a global
main_window_handle = hwnd;
main_instance      = hinstance;

// perform all game console specific initialization
Game_Init();

// enter main event loop
while(1)
    {
    if (PeekMessage(&msg,NULL,0,0,PM_REMOVE))
        {
        // test if this is a quit
        if (msg.message == WM_QUIT)
           break;

        // translate any accelerator keys
        TranslateMessage(&msg);

        // send the message to the window proc
        DispatchMessage(&msg);
        } // end if

    // main game processing goes here
    Game_Main();

    } // end while

// shutdown game and release all resources
Game_Shutdown();

// return to Windows like this
return(msg.wParam);

} // end WinMain

// WINX GAME PROGRAMMING CONSOLE FUNCTIONS ////////////////

int Game_Init(void *parms)
{
// this function is where you do all the initialization
// for your game

int index; // looping varsIable

char filename[80]; // used to build up filenames

// seed random number generate
srand(Start_Clock());

screen_width = 640;
screen_height = 480;
screen_bpp    = 8;

// start up DirectDraw (replace the parms as you desire)
DD_Init(screen_width, screen_height, screen_bpp);

// load background image
Load_Bitmap_File(&bitmap8bit, "SKY8.BMP");
Create_Bitmap(&background_bmp,0,0,640,480);
Load_Image_Bitmap(&background_bmp, &bitmap8bit,0,0,BITMAP_EXTRACT_MODE_ABS);
Set_Palette(bitmap8bit.palette);
Unload_Bitmap_File(&bitmap8bit);

// load the bitmaps
Load_Bitmap_File(&bitmap8bit, "CHOP8.BMP");

// create bob
Create_BOB(&chopper[0],0,120,200,64,3,BOB_ATTR_MULTI_FRAME | BOB_ATTR_VISIBLE, DDSCAPS_SYSTEMMEMORY);

// set animation speed
Set_Anim_Speed_BOB(&chopper[0], 1);

// set motion speed
Set_Vel_BOB(&chopper[0],2+rand()%6,0);

// set position
Set_Pos_BOB(&chopper[0], rand()%screen_width, rand()%screen_height);

// load the bob in
for (index=0; index < 3; index++)
    Load_Frame_BOB(&chopper[0], &bitmap8bit, index, 0, index, BITMAP_EXTRACT_MODE_CELL);

// now make the remaining 15 clones
for (index=1; index < NUM_CHOPPERS; index++)
    {
    // clone the bob
    Clone_BOBX(&chopper[0], &chopper[index]);

    // set new position and velocity
    Set_Vel_BOB(&chopper[index],2+rand()%6,0);
    Set_Pos_BOB(&chopper[index], rand()%screen_width, rand()%screen_height);

    // now here the tricky part, alter the size of the bob, but make sure
    // to keep the aspect ratio the same, so it doesn't look scrunched
    float width  = 200 - 10 * index;
    float height = (float)width*((float)64/(float)200);

    // store new width and height in varsIable cache positions 0,1
    chopper[index].varsI[0] = width;
    chopper[index].varsI[1] = height;

    } // end for index

// unload bitmap image
Unload_Bitmap_File(&bitmap8bit);

// initialize directinput
DInput_Init();

// acquire the keyboard only
DI_Init_Keyboard();

// initilize DirectSound
DSound_Init();

// load background sounds
sound_id = Load_WAV("CHOP.WAV");

// start the sounds
Play_Sound(sound_id, DSBPLAY_LOOPING);

// set clipping rectangle to screen extents so objects dont
// mess up at edges
RECT screen_rect = {0,0,screen_width,screen_height};
lpddclipper = DD_Attach_Clipper(lpddsback,1,&screen_rect);

// hide the mouse
ShowCursor(FALSE);

// return success
return(1);

} // end Game_Init

///////////////////////////////////////////////////////////

int Game_Shutdown(void *parms)
{
// this function is where you shutdown your game and
// release all resources that you allocated

// shut everything down

// kill all the bobs
for (int index=0; index < NUM_CHOPPERS; index++)
    Destroy_BOBX(&chopper[index]);

// shutdown directdraw last
DD_Shutdown();

// now directsound
Stop_All_Sounds();
DSound_Shutdown();

// shut down directinput
DInput_Shutdown();

// return success
return(1);

} // end Game_Shutdown

//////////////////////////////////////////////////////////

int Game_Main(void *parms)
{
// this is the workhorse of your game it will be called
// continuously in real-time this is like main() in C
// all the calls for you game go here!
int index; // looping var

// start the timing clock
Start_Clock();

// clear the drawing surface
DD_Fill_Surface(lpddsback, 0);

// lock back buffer and copy background into it
DD_Lock_Back_Surface();

// draw background
Draw_Bitmap(&background_bmp, back_buffer, back_lpitch,0);

// unlock back surface
DD_Unlock_Back_Surface();

// read keyboard
DI_Read_Keyboard();

// move and animate the fleet
for (index=0; index<NUM_CHOPPERS; index++)
    {
    // move the chopper
    Move_BOB(&chopper[index]);

    // test for off the screen wrap around
    if (chopper[index].x > screen_width)
       chopper[index].x = -chopper[index].width;

    // animate the bat
    Animate_BOB(&chopper[index]);

    } // end for index

// if (keyboard_state[DIK_RIGHT])

// draw the choppers
for (index=NUM_CHOPPERS-1; index>=0; index--)
    Draw_Scaled_BOB(&chopper[index], chopper[index].varsI[0], chopper[index].varsI[1],lpddsback);

// draw the title
Draw_Text_GDI("CONSTANT VELOCITY DEMO",10, 10,RGB(0,200,200), lpddsback);

// flip the surfaces
DD_Flip();

// sync to 30 fps = 1/30sec = 33 ms
Wait_Clock(33);

// check of user is trying to exit
if (KEY_DOWN(VK_ESCAPE) || keyboard_state[DIK_ESCAPE])
    {
    PostMessage(main_window_handle, WM_DESTROY,0,0);

    // stop all sounds
    Stop_All_Sounds();

    // do a screen transition
    Screen_Transitions(SCREEN_DARKNESS,NULL,0);
    } // end if

// return success
return(1);

} // end Game_Main

//////////////////////////////////////////////////////////