Game Development Reference
In-Depth Information
public function Game() {
addEventListener(Event.ENTER_FRAME, gameLoop);
bg = new BackImage();
addChild(bg);
Next, we move on to the scoreboard. Unfortunately, adding text to the screen programmatically in
AS3 takes a few more lines of code than we would like. This seemingly daunting set of code that
follows really only sets the initial values for the scoreboard (Score: 0, Level: 1, and Misses: 0) and
places those items on the screen. We set all the
x
values individually across the screen, while the
y
value for each item's location is the
SCOREBOARD_Y
we created a earlier. After we set all the
values for the
TextField
s, we add them to the display list using
addChild(TextField)
for each
one. Since we are using the Flash IDE, we could simply drag these items to the stage, but
instantiating them in code makes this easily portable to Flex or even other languages.
scoreLabel.text = "Score:";
levelLabel.text = "Level:";
chancesLabel.text ="Misses:"
scoreText.text ="0";
levelText.text ="1";
chancesText.text ="0";
scoreLabel.y = SCOREBOARD_Y;
levelLabel.y = SCOREBOARD_Y;
chancesLabel.y = SCOREBOARD_Y;
scoreText.y = SCOREBOARD_Y;
levelText.y = SCOREBOARD_Y;
chancesText.y = SCOREBOARD_Y;
scoreLabel.x = 5;
scoreText.x = 50;
chancesLabel.x = 105;
chancesText.x = 155;
levelLabel.x = 205;
levelText.x = 260;
addChild(scoreLabel);
addChild(levelLabel);
addChild(chancesLabel);
addChild(scoreText);
addChild(levelText);
addChild(chancesText);
gameState = STATE_INIT;
}
Initializing the game loop
Since we set the state to
STATE_INIT
at the end of the constructor, we know that
initGame()
will
be called the next time the
gameLoop()
is called.
initGame()
simply resets all the values to what
they need to be to start playing. We initialize
score
,
level
, and
chances
and update the
levelText.text
property to the value of
level.toString()
(because
levelText.text
requires a
String
).
