Add: AlienTimer

src/game/mouse/space_invaders/alien_timer.js

@@ -0,0 +1,99 @@
+class AlienTimer {
+
+	constructor(aliens) {
+		this.aliens = aliens;
+		this.activatedAlienIndex = 0;
+
+		let posX = this.aliens[0].x;
+		let posY = this.aliens[0].y - AlienTimer.MOVE_UP_AMOUNT_PX;
+		this.timerText = game.add.text(posX, posY, "30", AlienTimer.DEFAULT_TEXT_FONT);
+		this.timerText.anchor.set(0.5);
+
+		var grd = this.timerText.context.createLinearGradient(0, 0, 0, this.timerText.height);
+		grd.addColorStop(0, '#FFD68E');
+		grd.addColorStop(1, '#B34C00');
+		this.timerText.fill = grd;
+		// this.setShadow(3, 3, 'rgba(0, 0, 0, 0.5)', 2);
+		this.timerText.stroke = '#000';
+		this.timerText.strokeThickness = 5;
+
+		this.timerEvent = null;
+		this.timeInterval = AlienTimer.DEFAULT_TIME_GAP_SEC;
+		this.timeLeft = this.timeInterval;
+	}
+
+	start() {
+		this.enableTimerOn(this.getActivatedAlien());
+		// this.getActivatedAlien().setActive(true);
+		this.timerText.text = this.timeLeft.toString();
+		if(this.timerEvent === null)
+			this.timerEvent = game.time.events.loop(Phaser.Timer.SECOND, this.updateTimer, this);
+	}
+
+	pause() {
+	}
+
+	stop() {
+		if(this.timerEvent)
+			this.removeTimer();
+		this.timerText.text = "";
+
+		for(let i = 0; i < this.aliens.length; i++)
+			this.aliens[i].stop();
+	}
+
+	next() {
+		this.timeLeft = this.timeInterval;
+		this.timerText.text = this.timeLeft.toString();
+
+		this.activatedAlienIndex++;
+		if(this.activatedAlienIndex >= this.aliens.length) {
+			this.timerText.text = "";
+			this.removeTimer();
+			return null;
+		}
+
+		this.enableTimerOn(this.getActivatedAlien());
+	}
+
+	getActivatedAlien() {
+		return this.aliens[this.activatedAlienIndex];
+	}
+
+	enableTimerOn(alien) {
+		alien.setActive(true);
+		this.timerText.x = alien.x;
+	}
+
+	disableTimerOn(alien) {
+		alien.setActive(false);
+		this.timerText.text = "";
+	}
+
+	updateTimer() {
+		this.timeLeft--;
+		if(this.timeLeft == 0) {
+			this.timeLeft = this.timeInterval;
+
+			this.getActivatedAlien().goOnstage();
+		} else {
+			this.timerText.text = this.timeLeft.toString();
+		}
+	}
+
+	removeTimer() {
+		game.time.events.remove(this.timerEvent);
+		this.timerEvent = null;
+	}
+
+}
+
+AlienTimer.DEFAULT_TEXT_FONT		= {
+	font: "bold 30px Arial",
+	boundsAlignH: "center",		// left, center. right
+	boundsAlignV: "middle", 	// top, middle, bottom
+	fill: "#fff"
+};
+
+AlienTimer.DEFAULT_TIME_GAP_SEC		= 10;
+AlienTimer.MOVE_UP_AMOUNT_PX		= 60;