demo9_3_16b.cpp

《Windows游戏编程大师技巧（第二版）》源代码

   // unlock surface
   DDraw_Unlock_Back_Surface();

   // return success
   return(1);

   } // end if

// return failure
return(0);

} // end Move_Missle

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

int Draw_Missile(void)
{
// this function draws the missile 

// test if missile is alive
if (missile_state==1)
   {
   // lock secondary buffer
   DDraw_Lock_Back_Surface();

   // draw the missile in green
   Draw_Clip_Line16(missile_x, missile_y, 
                    missile_x, missile_y+6,
                    RGB16Bit(255,255,255),back_buffer, back_lpitch);

   // unlock surface
   DDraw_Unlock_Back_Surface();

   // return success
   return(1);

   } // end if

// return failure
return(0);

} // end Draw_Missle

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

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

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

int index;         // looping var
char filename[80]; // used to build up files names

// start up DirectDraw (replace the parms as you desire)
DDraw_Init(WINDOW_WIDTH, WINDOW_HEIGHT, WINDOW_BPP, WINDOWED_APP);

// joystick creation section ////////////////////////////////

// first create the direct input object
if (DirectInput8Create(main_instance,DIRECTINPUT_VERSION, IID_IDirectInput8, (void **)&lpdi,NULL)!=DI_OK)
   return(0);

// first find the fucking GUID of your particular joystick
lpdi->EnumDevices(DI8DEVCLASS_GAMECTRL, 
                  DI_Enum_Joysticks, 
                  &joystickGUID, 
                  DIEDFL_ATTACHEDONLY); 

if (lpdi->CreateDevice(joystickGUID, &lpdijoy, NULL)!=DI_OK)
   return(0);

// set cooperation level
if (lpdijoy->SetCooperativeLevel(main_window_handle, 
	                 DISCL_NONEXCLUSIVE | DISCL_BACKGROUND)!=DI_OK)
   return(0);

// set data format
if (lpdijoy->SetDataFormat(&c_dfDIJoystick)!=DI_OK)
   return(0);

// set the range of the joystick
DIPROPRANGE joy_axis_range;

// first x axis
joy_axis_range.lMin = -24;
joy_axis_range.lMax = 24;

joy_axis_range.diph.dwSize       = sizeof(DIPROPRANGE); 
joy_axis_range.diph.dwHeaderSize = sizeof(DIPROPHEADER); 
joy_axis_range.diph.dwObj        = DIJOFS_X;
joy_axis_range.diph.dwHow        = DIPH_BYOFFSET;

lpdijoy->SetProperty(DIPROP_RANGE,&joy_axis_range.diph);

// now y-axis
joy_axis_range.lMin = -24;
joy_axis_range.lMax = 24;

joy_axis_range.diph.dwSize       = sizeof(DIPROPRANGE); 
joy_axis_range.diph.dwHeaderSize = sizeof(DIPROPHEADER); 
joy_axis_range.diph.dwObj        = DIJOFS_Y;
joy_axis_range.diph.dwHow        = DIPH_BYOFFSET;

lpdijoy->SetProperty(DIPROP_RANGE,&joy_axis_range.diph);

// and now the dead band

DIPROPDWORD dead_band; // here's our property word

dead_band.diph.dwSize       = sizeof(dead_band);
dead_band.diph.dwHeaderSize = sizeof(dead_band.diph);
dead_band.diph.dwObj        = DIJOFS_X;
dead_band.diph.dwHow        = DIPH_BYOFFSET;

// 10% will be used on both sides of the range +/-
dead_band.dwData            = 1000;

// finally set the property
lpdijoy->SetProperty(DIPROP_DEADZONE,&dead_band.diph);

dead_band.diph.dwSize       = sizeof(dead_band);
dead_band.diph.dwHeaderSize = sizeof(dead_band.diph);
dead_band.diph.dwObj        = DIJOFS_Y;
dead_band.diph.dwHow        = DIPH_BYOFFSET;

// 10% will be used on both sides of the range +/-
dead_band.dwData            = 1000;

// finally set the property
lpdijoy->SetProperty(DIPROP_DEADZONE,&dead_band.diph);


// acquire the joystick
if (lpdijoy->Acquire()!=DI_OK)
   return(0);

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

// load the background
Load_Bitmap_File(&bitmap16bit, "MUSH_24.BMP");

// load in the four frames of the mushroom
for (index=0; index<4; index++)
    {
    // create mushroom bitmaps
    Create_Bitmap(&mushrooms[index],0,0,32,32,16);
    Load_Image_Bitmap16(&mushrooms[index],&bitmap16bit,index,0,BITMAP_EXTRACT_MODE_CELL);  
    } // end for index

// now create the bug blaster bob
Create_BOB(&blaster,0,0,32,32,3,
           BOB_ATTR_VISIBLE | BOB_ATTR_MULTI_ANIM | BOB_ATTR_ANIM_ONE_SHOT,
           DDSCAPS_SYSTEMMEMORY,0,16);

// load in the four frames of the mushroom
for (index=0; index < 3; index++)
     Load_Frame_BOB16(&blaster,&bitmap16bit,index,index,1,BITMAP_EXTRACT_MODE_CELL);  

// unload the bitmap file
Unload_Bitmap_File(&bitmap16bit);

// set the animation sequences for bug blaster
Load_Animation_BOB(&blaster,0,5,blaster_anim);

// set up stating state of bug blaster
Set_Pos_BOB(&blaster,320, 400);
Set_Anim_Speed_BOB(&blaster,3);

// create mushroom playfield bitmap
Create_Bitmap(&playfield,0,0,SCREEN_WIDTH,SCREEN_HEIGHT, 16);
playfield.attr |= BITMAP_ATTR_LOADED;

// fill in the background
Load_Bitmap_File(&bitmap16bit, "GRASS_24.BMP");

// load the grass bitmap image
Load_Image_Bitmap16(&playfield,&bitmap16bit,0,0,BITMAP_EXTRACT_MODE_ABS);
Unload_Bitmap_File(&bitmap16bit);

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

// create the random mushroom patch
for (index=0; index<50; index++)
    {
    // select a mushroom
    int mush = rand()%4;

    // set mushroom to random position
    mushrooms[mush].x = rand()%(SCREEN_WIDTH-32);
    mushrooms[mush].y = rand()%(SCREEN_HEIGHT-128);

    // now draw the mushroom into playfield
    Draw_Bitmap16(&mushrooms[mush], playfield.buffer, playfield.width*2,1);

    } // end for

// hide the mouse
if (!WINDOWED_APP)
    ShowCursor(FALSE);

// return success
return(1);

} // end Game_Init

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

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

// kill the bug blaster
Destroy_BOB(&blaster);

// kill the mushroom maker
for (int index=0; index<4; index++)
    Destroy_Bitmap(&mushrooms[index]);

// kill the playfield bitmap
Destroy_Bitmap(&playfield);

// release joystick
lpdijoy->Unacquire();
lpdijoy->Release();
lpdi->Release();

// shutdonw directdraw
DDraw_Shutdown();

// return success
return(1);
} // end Game_Shutdown

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

int Game_Main(void *parms, int num_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
int          dx,dy;             // general deltas used in collision detection


// check of user is trying to exit
if (KEY_DOWN(VK_ESCAPE) || KEY_DOWN(VK_SPACE))
    PostMessage(main_window_handle, WM_DESTROY,0,0);

// start the timing clock
Start_Clock();

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

// get joystick data
lpdijoy->Poll(); // this is needed for joysticks only
lpdijoy->GetDeviceState(sizeof(DIJOYSTATE), (LPVOID)&joy_state);

// lock the back buffer
DDraw_Lock_Back_Surface();

// draw the background reactor image
Draw_Bitmap16(&playfield, back_buffer, back_lpitch, 0);

// unlock the back buffer
DDraw_Unlock_Back_Surface();

// is the player moving?
blaster.x+=joy_state.lX;
blaster.y+=joy_state.lY;

// test bounds
if (blaster.x > SCREEN_WIDTH-32)
    blaster.x = SCREEN_WIDTH-32;
else
if (blaster.x < 0)
    blaster.x = 0;

if (blaster.y > SCREEN_HEIGHT-32)
    blaster.y = SCREEN_HEIGHT-32;
else
if (blaster.y < SCREEN_HEIGHT-128)
    blaster.y = SCREEN_HEIGHT-128;

// is player firing?
if (joy_state.rgbButtons[0])
   Start_Missile();

// move and draw missle
Move_Missile();
Draw_Missile();

// is it time to blink eyes
if ((rand()%100)==50)
   Set_Animation_BOB(&blaster,0);

// draw blaster
Animate_BOB(&blaster);
Draw_BOB16(&blaster,lpddsback);

// draw some text
Draw_Text_GDI("Make My Centipede!",0,0,RGB(255,255,255),lpddsback);

// display joystick and buttons 0-7
sprintf(buffer,"Joystick Stats: X-Axis=%d, Y-Axis=%d, buttons(%d,%d,%d,%d,%d,%d,%d,%d)",
                                                                      joy_state.lX,joy_state.lY,
                                                                      joy_state.rgbButtons[0],
                                                                      joy_state.rgbButtons[1],
                                                                      joy_state.rgbButtons[2],
                                                                      joy_state.rgbButtons[3],
                                                                      joy_state.rgbButtons[4],
                                                                      joy_state.rgbButtons[5],
                                                                      joy_state.rgbButtons[6],
                                                                      joy_state.rgbButtons[7]);

Draw_Text_GDI(buffer,0,SCREEN_HEIGHT-20,RGB(255,255,50),lpddsback);

// print out name of joystick
sprintf(buffer, "Joystick Name & Vendor: %s",joyname);
Draw_Text_GDI(buffer,0,SCREEN_HEIGHT-40,RGB(255,255,50),lpddsback);


// flip the surfaces
DDraw_Flip();

// sync to 30 fps
Wait_Clock(30);

// return success
return(1);

} // end Game_Main

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