VAZBREAK Game Design Notes (Apr 16, 2003)

Based on Andre Lamothe's game demo freakout.cpp in
Tricks of the Windows Game Programming Gurus (1999, 1st edition)

For WIN32 game, Visual C++ compiler, GDI graphics only (no DirectX)

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GAME STATES for "VazBreak"

GAME_STATE_DEMO_INIT  = 0
GAME_STATE_DEMO_RUN   = 1
GAME_STATE_GAME_INIT  = 2
GAME_STATE_GAME_RUN   = 3
GAME_STATE_GAME_RESET = 4
GAME_STATE_GAME_PAUSE = 5

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GLOBAL VARS and initial values

int game_state = DEMO_INIT;  // initial game state

int game_score = 0;          // game score

int game_level = 1;          // game level (starts at 1)

int blocks_hit = 0;          // number of blocks hit

int paddles_left = 0;        // number of paddles left
                             // (0 since at Game Over paddles = 0)

int xball, yball;            // x and y ball position

int xmove, ymove;            // x and y ball movement
                             // (velocity = -3/+3 slow, -6/+6 medium, -9/+9 fast)
                             // ball starts slow, if hit middle block go medium
                             // if hit highest block, go fast
                             
int xpaddle;                 // x paddle position only (since y is constant)

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PSEUDO CODE for "VazBreak"

When DEMO_INIT

  Clear Screen
  Draw Border
  Draw Blocks
  Draw Text "VazBreak" and instructions (above blocks)
  Display score/level/paddles (bottom of screen)
  Set ball position and movement (move fast for demo)
  
  Set state to DEMO_RUN
    

When DEMO_RUN

  Move ball (bounce off walls and bottom)
  Wait for <space bar> key
  IF <space bar> pressed, set state to GAME_INIT
  
  Otherwise, leave state at DEMO_RUN
    

When GAME_INIT

  Clear Screen
  Draw Border
  Draw Blocks
  Set score = 0, level = 1, paddles = 3
  Display score/level/paddles (bottom of screen)
  Set ball position and movement (move slow)
  Set paddle position (middle of screen)
  
  Set state to GAME_RUN
      

When GAME_RUN

  Move ball (bounce off wall, paddle, blocks)
  Move paddle (check arrow keys, left/right)
  Check collision with block/paddle
  
  IF paddle hit ball, deflect at different angles    
  IF paddle missed ball subtract one from paddles
  IF paddles = 0, set state to DEMO_INIT (game over)
  
  IF collision with block
    Remove block, update score, add one to blocks_hit
  IF ALL blocks hit, set state to GAME_RESET
  
  IF "p" key pressed, set state to GAME_PAUSE
  
  Otherwise, leave state at GAME_RUN
      

When GAME_RESET

  Clear Screen
  Draw Border
  Draw Blocks
  Add 500 to score, add one to level
  Display score/level/paddles (bottom of screen)
  Set ball position and movement (move slow)
  Set paddle position (middle of screen)
  
  Set state to GAME_RUN
  

When GAME_PAUSE

  Stop all movement (by not updating ball/paddle)
  Wait for <space bar> key to resume
  If <space bar> key pressed, set state to GAME_RUN
  
  Otherwise, leave state at GAME_PAUSE
  
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VAZBREAK block diagram (border rects and block positions)

BLOCK_WIDTH  = 47  (total = 50 with gap)
BLOCK_HEIGHT = 15  (total = 18 with gap)
BLOCK_GAP    =  3

borders = (  0,0 to 25,600  ) WHITE
          (  0,0 to 800,25  ) WHITE
          (778,0 to 800,600)  WHITE


*(0,0)---                                                                  *(778,0)---

                                                                          ---(800,25)*
                                                                          
                                       BLOCKS
                                                                                     
       B1  B2  B3   B4   B5   B6   B7   B8   B9   B10  B11  B12  B13  B14  B15                               
                                                                                  
     X=28--78--128--178--228--278--328--378--428--478--528--578--628--678--728--                                                                        
                                                                                  
RED Y= 128                                                                                 
RED Y= 146
RED Y= 164
BLU Y= 182
BLU Y= 200
BLU Y= 218
GRN Y= 236
GRN Y= 254
GRN Y= 272
            Min X=28----------------------------------------------------Max X=745
           Y=560                           PADDLE-WHITE

---*(25,600)  SCORE = XXX   LEVEL = XX   PADDLES = X  VazBreak (c) 2003  ---(800,600)*

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END OF DESIGN NOTES