3D Game Programming for Kids, 2nd Edition

Scoreboard

We’ll want to keep score in this mini-game, so let’s add a scoreboard. Below the line that creates the new Launcher(), add the usual scoreboard code:

var scoreboard = new Scoreboard();
scoreboard.countdown(60);
scoreboard.score(0);
scoreboard.help(
  'Use right and left arrow keys to point the launcher. ' +
  'Press and hold the down arrow key to power up the launcher. ' +
  'Let go of the down arrow key to launch. ' +
  'Watch out for the wind!!!'
);
scoreboard.onTimeExpired(timeExpired);
function timeExpired() {
  scoreboard.message("Game Over!");
}

You can skip the help text for now if you’re eager to get back to coding. Just don’t forget to add it later—it’s no fun playing a game where you don’t know the ...