Creating an Optimized Post-Retro Game - The Essential Guide to Flash Games - page 553

case STATE_SYSTEM_GAME_PLAY:
systemFunction = systemGamePlay;
break;

case STATE_SYSTEM_PLAYER_EXPLODE :
systemFunction = systemPlayerExplode;
break;
}
}
The systemGamePlay function makes use of the timeDifference variable by passing it into the
update function.
private function systemGamePlay(timeDifference:Number=0):void {
trace("in game play");
update(timeDifference);
checkCollisions();
render();
updateScoreBoard();
checkforEndLevel();
checkforEndGame();
}
The checkForEndGame function is unique to this game. When the player runs out of shields, the
game is over. The checkCollisions function will set the gameOver Boolean to true when the
shield variable is less than 0. We have a special explode function for the player that displays 300
particles. It reuses the projectile BitmapData for the look of the particles. The internal game state
machine is set to run in the STATE_SYSYTEM_PLAYEREXPLODE state rather than the normal
STATE_SYSTEM_GAMEPLAY state when the player is in the process of exploding.
private function checkforEndGame():void {
if (gameOver ) {

dispatchEvent(new CustomEventSound(CustomEventSound.STOP_SOUND,

Main.SOUND_MUSIC_IN_GAME, true));

dispatchEvent(new CustomEventSound(CustomEventSound.PLAY_SOUND,

Main.SOUND_PLAYER_EXPLODE, false, 1, 8, 1));

canvasBitmapData.copyPixels(backgroundBitmapData, new Rectangle(0,0,32,32),

player.point);

createPlayerExplode(player.x + 16, player.y + 16, 300);
playerStarted = falset
switchSystemState(STATE_SYSTEM_PLAYER_EXPLODE);
}
}
The checkForEndLevel function decides if the player is ready to proceed to the next game level.
The level ends when all of the mines have been destroyed. We don't want the level to end too
abruptly, so we wait until there are only 24 particles left on the screen and then start the new
level. The player is erased from the screen by copying the background under the player back on
top of its current location.