Fix: group -> array, tint grey while disbled

src/game/mouse/space_invaders/game.js

@@ -21,18 +21,17 @@ class Game {
 
 
 		// contents
-		this.alienGroup = game.add.group();
-		this.alienGroup.inputEnableChildren = true;
+		this.activatedAlienIndex = 0;
+		this.aliens = [];
 		for(let i = 0; i < 10; i++) {
-			let alien = new Alien(150 + 80 * i, 150, this.onAlienFired, this.onAlienFired);
+			let alien = new Alien(150 + 80 * i, 150,
+				() => { this.activateNextAlien(); },	// onGoOnstage
+				this.onAlienFired, this.onAlienEscaped);
 			alien.goWaitingRoom();
 			alien.setActive(false);
-			this.alienGroup.add(alien);
+			this.aliens.push(alien);
 		}
 
-		// activate first alien
-		// this.alienGroup[0].setActive(true);
-
 
 		// bottom
 		let screenBottom = new ScreenBottom(game);
@@ -78,15 +77,23 @@ class Game {
 	*/
 
 	startGame() {
-		console.log("startGame");
+		// activate first alien
+		this.activateNextAlien();
 	}
 
-	onAlienFired(sprite) {
+	activateNextAlien() {
+		if(this.activatedAlienIndex === this.aliens.length)
+			return;
+
+		this.aliens[this.activatedAlienIndex].setActive(true);
+		this.activatedAlienIndex++;
+	}
+
+	onAlienFired() {
 		console.log("onAlienFired");
-		sprite.goOnstage();
 	}
 
-	onAlienEscaped(sprite) {
+	onAlienEscaped() {
 		console.log("onAlienEscaped");
 	}