/**** 
* Classes
****/ 
/***********************************************************************************/ 
/********************************** BULLET CLASS ***********************************/
/***********************************************************************************/ 
var Bullet = Container.expand(function (isLeft, isTop) {
	var self = Container.call(this);
	self.isTop = isTop;
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5,
		width: 10,
		height: 250,
		tint: 0x00FF00,
		alpha: 0.8
	});
	self.distanceToCenter = 1024;
	self.isLeft = isLeft;
	self.speed = 10;
	self.update = function () {
		self.x += self.isLeft ? self.speed : -self.speed;
		self.y += self.isTop ? self.speed * 0.6 : -self.speed * 0.6;
		// Calculate distance to center and adjust width accordingly
		self.distanceToCenter = Math.abs(self.x - 1024);
		var shrinkRatio = 0.1 + Math.pow(self.distanceToCenter, 1.2) * 5 / Math.pow(1024, 1.2);
		self.width = Math.max(0.5, 6 * Math.pow(shrinkRatio, 1.1));
		self.height = Math.max(10, 250 * Math.pow(shrinkRatio, 1.1));
		self.speed = Math.max(40, Math.min(100, 100 * Math.exp(self.distanceToCenter / 1024 - 1)));
		if (self.distanceToCenter <= 100) {
			self.checkForCollision();
		}
	};
	self.checkForCollision = function () {
		for (var i = enemies.length - 1; i >= 0; i--) {
			if (self.intersects(enemies[i])) {
				// Handle collision: destroy bullet and enemy, update score, etc.
				self.destroy();
				enemies[i].explode(function (index) {
					return function () {
						if (enemies[index]) {
							enemies[index].destroy();
							enemies.splice(index, 1);
						}
					};
				}(i));
				if (bullets.indexOf(self) !== -1) {
					bullets.splice(bullets.indexOf(self), 1);
				}
				// Update score
				LK.setScore(LK.getScore() + 1);
				break;
			}
		}
	};
});
/***********************************************************************************/ 
/********************************** COCKPIT CLASS ***********************************/
/***********************************************************************************/ 
var CockpitDisplay = Container.expand(function () {
	var self = Container.call(this);
	self.cockpitButtonStand = self.attachAsset('fireButtonStand', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 0.9,
		y: 2732 + 300
	});
	self.cockpitButtonBase = self.attachAsset('fireButtonBase', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 1,
		y: 2732
	});
	self.cockpitButton = self.attachAsset('fireButton', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 0,
		y: 2732 - 570
	});
	self.cockpitButton.originalScaleX = self.cockpitButton.scale.x;
	self.cockpitButton.originalScaleY = self.cockpitButton.scale.y;
	self.cockpitButton.isAnimating = false;
});
/***********************************************************************************/ 
/********************************** FIGHTER CLASS **********************************/
/***********************************************************************************/ 
var Fighter = Container.expand(function () {
	var self = Container.call(this);
	var fighterGraphics = self.attachAsset('fighter', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 1;
	self.update = function () {
		self.speed = Math.exp((5000 - self.z) * 0.002); // Increase speed exponentially as they come closer
		self.z -= self.speed;
		var sizeRatio = (5000 - self.z) / 5000;
		fighterGraphics.width = 1024 * sizeRatio;
		fighterGraphics.height = 1024 * sizeRatio;
		var directionX = 0; //self.x - 1024; // 1024 is half the width of the screen
		var directionY = self.y - 512; // 1366 is half the height of the screen
		var length = Math.sqrt(directionX * directionX + directionY * directionY);
		if (length === 0) {
			length = 1;
		}
		directionX += current3DSpaceAngles.deltaH * 4000;
		directionY += current3DSpaceAngles.deltaV * 10;
		directionX /= length;
		directionY /= length;
		self.x += directionX * self.speed;
		self.y += directionY * self.speed;
		if (self.z < -2000 || self.x < 0 || self.x > 2048 || self.y < 0 || self.y > 2732) {
			self.destroy();
		}
	};
	self.shoot = function () {
		var bullet = new Bullet(false);
		bullet.x = self.x;
		bullet.y = self.y + fighterGraphics.height / 2;
		bullets.push(bullet);
		game.addChild(bullet);
	};
	self.explode = function (callback) {
		var explosion = self.attachAsset('explosion1', {
			anchorX: 0.5,
			anchorY: 0.5,
			width: 100,
			height: 100
		});
		// Play explosion sound
		LK.getSound('explosion').play();
		var growInterval = LK.setInterval(function () {
			explosion.width += 10;
			explosion.height += 10;
			if (explosion.width >= fighterGraphics.width) {
				{
					fighterGraphics.visible = false;
				}
				if (explosion.width >= 512) {
					LK.clearInterval(growInterval);
					explosion.destroy();
					if (callback) {
						callback();
					}
				}
			}
		}, 16); // 60 FPS
	};
});
/***********************************************************************************/ 
/******************************** SPACESHIP CLASS **********************************/
/***********************************************************************************/ 
var Spaceship = Container.expand(function () {
	var self = Container.call(this);
	var canonLeft = self.attachAsset('canon', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: -1100,
		y: 650,
		rotation: -Math.PI * 0.01
	});
	var canonRight = self.attachAsset('canon', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: -1,
		x: 1100,
		y: 650,
		rotation: Math.PI * 0.01
	});
	var centralHud = self.attachAsset('aimingCentralHud', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 0.6,
		y: -100,
		tint: 0x00FF00
	});
	var spaceshipGraphics = self.attachAsset('spaceship', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.coords = {
		x: 0,
		y: 0,
		z: 0
	};
	self.speed = 0.01;
	self.isShooting = false;
	self.update = function () {
		// Update space coordinates
		spaceship.coords.x += Math.sin(current3DSpaceAngles.horizontalAngle) * spaceship.speed;
		spaceship.coords.y += Math.cos(current3DSpaceAngles.verticalAngle) * spaceship.speed;
		spaceship.coords.z += Math.sin(current3DSpaceAngles.verticalAngle) * Math.cos(current3DSpaceAngles.horizontalAngle) * spaceship.speed;
		self.targetLocked = false;
		if (!self.centralHud) {
			self.centralHud = self.attachAsset('aimingCentralHud', {
				anchorX: 0.5,
				anchorY: 0.5,
				alpha: 0.6,
				y: -100,
				tint: 0x00FF00
			});
		}
		for (var i = enemies.length - 1; i >= 0; i--) {
			if (self.centralHud.intersects(enemies[i])) {
				self.targetLocked = true;
				break;
			}
		}
		elf.centralHud.tint = self.targetLocked ? 0x00FF00 : 0xFFFFFF;
	};
	self.shoot = function () {
		if (self.isShooting) {
			return;
		}
		self.isShooting = true;
		// Recoil effect for left canon
		var originalLeftX = canonLeft.x;
		var originalLeftY = canonLeft.y;
		var recoilDistance = 40;
		var recoilSpeed = 5;
		var recoilLeftInterval = LK.setInterval(function () {
			canonLeft.x -= recoilSpeed;
			canonLeft.y += recoilSpeed;
			if (canonLeft.x <= originalLeftX - recoilDistance) {
				LK.clearInterval(recoilLeftInterval);
				var returnLeftInterval = LK.setInterval(function () {
					canonLeft.x += recoilSpeed;
					canonLeft.y -= recoilSpeed;
					if (canonLeft.x >= originalLeftX) {
						canonLeft.x = originalLeftX;
						canonLeft.y = originalLeftY;
						LK.clearInterval(returnLeftInterval);
						self.isShooting = false;
					}
				}, 16);
			}
		}, 16);
		// Recoil effect for right canon
		var originalRightX = canonRight.x;
		var originalRightY = canonRight.y;
		var recoilRightInterval = LK.setInterval(function () {
			canonRight.x += recoilSpeed;
			canonRight.y += recoilSpeed;
			if (canonRight.x >= originalRightX + recoilDistance) {
				LK.clearInterval(recoilRightInterval);
				var returnRightInterval = LK.setInterval(function () {
					canonRight.x -= recoilSpeed;
					canonRight.y -= recoilSpeed;
					if (canonRight.x <= originalRightX) {
						canonRight.x = originalRightX;
						canonRight.y = originalRightY;
						LK.clearInterval(returnRightInterval);
					}
				}, 16);
			}
		}, 16);
		// Play laserShot sound
		LK.getSound('laserShot').play();
		// Spawn bullets from side canons
		var leftBullet = new Bullet(true);
		leftBullet.x = 0; // Adjust for left canon position
		leftBullet.y = self.y + 512; // Start the bullet just above the spaceship
		leftBullet.rotation = Math.PI * 0.30;
		game.addChildAt(leftBullet, 0);
		bullets.push(leftBullet);
		var rightBullet = new Bullet(false);
		rightBullet.x = game.width; // Adjust for right canon position
		rightBullet.y = self.y + 512; // Start the bullet just above the spaceship
		rightBullet.rotation = -Math.PI * 0.30;
		game.addChildAt(rightBullet, 0);
		bullets.push(rightBullet);
	};
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000 // Initialize game with a black background
});

/**** 
* Game Code
****/ 
function animateCockpitButton() {
	if (cockpitDisplay.cockpitButton.isAnimating) {
		return;
	}
	cockpitDisplay.cockpitButton.isAnimating = true;
	var moveDown = true;
	var originalY = cockpitDisplay.cockpitButton.y;
	var originalBaseY = cockpitDisplay.cockpitButtonBase.y;
	var animationInterval = LK.setInterval(function () {
		if (moveDown) {
			cockpitDisplay.cockpitButton.y += 15;
			cockpitDisplay.cockpitButtonBase.y += 1;
			if (cockpitDisplay.cockpitButton.y >= originalY + 20) {
				moveDown = false;
			}
		} else {
			cockpitDisplay.cockpitButton.y -= 15;
			cockpitDisplay.cockpitButtonBase.y -= 1;
			if (cockpitDisplay.cockpitButton.y <= originalY) {
				cockpitDisplay.cockpitButton.y = originalY;
				cockpitDisplay.cockpitButtonBase.y = originalBaseY;
				cockpitDisplay.cockpitButton.isAnimating = false;
				LK.clearInterval(animationInterval);
			}
		}
	}, 16); // 60 FPS
}
/* 
# Space Strike
### Game Design and Planning
1. **Game Objectives**: Defeating all enemy fighters.
2. **Game Levels**: Random map with an increasing number of ennemy figthers per level.
3. **Game Assets**: 
4. **Game Mechanics**: 
1. **Player Interaction**: 1st person view. Tap to shoot.
4. **Game Loop and Events**: Objects updates occur in the game loop. Input events are handled in input functions.
5. **Scoring and Progression**: Player's score is updated when killing ennemies. When no more ennemies game switches to next level.
6. **Game Over and Reset**: The game is over when player's lives reaches zero.
*/
/****************************************************************************************** */ 
/************************************** GLOBAL VARIABLES ********************************** */
/****************************************************************************************** */ 
// Enumeration for game states
var GAME_STATE = {
	INIT: 'INIT',
	MENU: 'MENU',
	HELP: 'HELP',
	STARTING: 'STARTING',
	NEW_ROUND: 'NEW_ROUND',
	PLAYING: 'PLAYING',
	SCORE: 'SCORE'
};
var gameState = GAME_STATE.INIT;
var player = {
	lives: 3
};
var nbStars = 80;
var starsSpeed = 10;
var stars = [];
var current3DSpaceAngles = {
	horizontalAngle: 0,
	verticalAngle: 0,
	deltaH: 0,
	deltaV: 0
};
var spaceship;
var cockpitDisplay;
var bullets = []; // Player's bullets
var enemies = [];
var rotationSpeed = 0.25;
var lastAngleChangeTime = Date.now();
var nextAngleChangeDelay = 4000;
var isDebug = true;
var fpsText;
var lastTick;
var frameCount;
var debugText;
var bgMusic;
/****************************************************************************************** */ 
/*********************************** UTILITY FUNCTIONS ************************************ */
/****************************************************************************************** */ 
function log() {
	if (isDebug) {
		var _console;
		(_console = console).log.apply(_console, arguments);
	}
}
/****************************************************************************************** */ 
/************************************** INPUT HANDLERS ************************************ */
/****************************************************************************************** */ 
game.on('down', function (x, y, obj) {
	switch (gameState) {
		case GAME_STATE.MENU:
			gameMenuDown(x, y, obj);
			break;
		case GAME_STATE.STARTING:
			gameStartingDown(x, y, obj);
			break;
		case GAME_STATE.PLAYING:
			gamePlayingDown(x, y, obj);
			break;
		case GAME_STATE.SCORE:
			// Handle score display logic here
			break;
	}
});
function gameMenuDown(x, y, obj) {
	log("gameMenuDown...");
	cleanMenuState();
	initStartingState();
}
function gameStartingDown(x, y, obj) {
	// TEMPORARY : Avoid multiple clicks
	//cleanStartingState();
	//initPlayingState();
}
function gamePlayingDown(x, y, obj) {
	log("gamePlayingDown ...");
	spaceship.shoot();
	animateCockpitButton();
}
/****************************************************************************************** */ 
/************************************* GAME FUNCTIONS **************************************** */
/****************************************************************************************** */ 
function initStars() {
	for (var i = 0; i < nbStars; i++) {
		var star = LK.getAsset('star', {
			anchorX: 0.5,
			anchorY: 0.5,
			alpha: 0.9,
			x: Math.random() * 2048,
			y: Math.random() * 2732
		});
		stars.push(star);
		game.addChild(star);
	}
	// Farther stars
	for (var i = 0; i < nbStars * 2; i++) {
		var star = LK.getAsset('star', {
			anchorX: 0.5,
			anchorY: 0.5,
			alpha: Math.random(),
			x: Math.random() * 2048,
			y: Math.random() * 2732,
			slow: true
		});
		stars.push(star);
		game.addChild(star);
	}
}
function starFieldAnimation() {
	stars.forEach(function (star) {
		// Calculate direction vector from center to star
		var directionX = star.x - 1024; // 1024 is half the width of the screen
		var directionY = star.y - 1366; // 1366 is half the height of the screen
		// Normalize direction
		var length = Math.sqrt(directionX * directionX + directionY * directionY);
		if (length === 0) {
			// Prevent division by zero
			length = 1;
		}
		directionX /= length;
		directionY /= length;
		// Add offset based on current3DSpaceAngles
		directionX += current3DSpaceAngles.deltaH * 10; //.horizontalAngle;
		directionY += current3DSpaceAngles.deltaV * 10; //.verticalAngle;
		// Move star away from center
		// Increase star size as it moves away to simulate faster movement
		var sizeIncrease = Math.min(Math.abs(directionX * 2), Math.abs(directionY * 2));
		star.width = Math.min(20, star.width + sizeIncrease * 0.05 * (star.slow ? 0 : 1)); // Limit width to 20
		star.height = star.width;
		star.x += directionX * starsSpeed * (star.slow ? 0.5 : 1); // Increase speed to 10 for faster star movement
		star.y += directionY * starsSpeed * (star.slow ? 0.5 : 1);
		if (star.alpha < 1) {
			star.alpha = Math.min(1, star.alpha + 0.01);
		}
		// Reset star position if it moves off screen
		if (star.x < 0 || star.x > 2048 || star.y < 0 || star.y > 2732) {
			star.x = Math.random() * 2048;
			star.y = Math.random() * 2732;
			// Reset height to initial value
			star.width = Math.random() * 10;
			star.height = star.width;
			star.alpha = Math.random() * (star.slow ? Math.random() * 0.5 : 1);
		}
	});
	// Move nebulas images here .x-=0.1
}
function loopBgMusic() {
	if (bgMusic && Date.now() - bgMusic.lastPlayTime > 10000) {
		bgMusic.lastPlayTime = Date.now();
		bgMusic.play();
	}
}
function handleGlobalMovement() {
	if (Date.now() - lastAngleChangeTime < nextAngleChangeDelay) {
		return;
	}
	var newDeltaH = 0;
	var newDeltaV = 0;
	if (current3DSpaceAngles.deltaH == 0 & current3DSpaceAngles.deltaH == 0) {
		var rH = Math.random();
		var rV = Math.random();
		var dirH = rH < 0.33 ? 1 : rH > 0.66 ? -1 : 0;
		var dirV = rV < 0.33 ? 1 : rV > 0.66 ? -1 : 0;
		newDeltaH = rH * 0.5 * dirH;
		newDeltaV = rV * 0.8 * dirV;
	}
	current3DSpaceAngles.deltaH = newDeltaH;
	current3DSpaceAngles.deltaV = newDeltaV;
	lastAngleChangeTime = Date.now();
	nextAngleChangeDelay = 2000 + 2000 * Math.random();
}
function handleBulletsLifeCycle() {
	for (var i = bullets.length - 1; i >= 0; i--) {
		if (bullets[i].distanceToCenter <= 4) {
			// Assuming a small threshold around the center for destruction
			bullets[i].destroy();
			bullets.splice(i, 1);
		}
	}
}
/****************************************************************************************** */ 
/************************************* GAME STATES **************************************** */
/****************************************************************************************** */ 
function gameInitialize() {
	log("Game initialize...");
	bgMusic = LK.getSound('bgMusic');
	bgMusic.lastPlayTime = 0;
	initStars();
	spaceship = game.addChild(new Spaceship());
	spaceship.centralHud = spaceship.attachAsset('aimingCentralHud', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 0.6,
		y: -100,
		tint: 0x00FF00
	});
	// Initialize enemy fighters
	for (var i = 0; i < 1; i++) {
		var fighter = new Fighter();
		fighter.x = 1024 + (Math.random() > 0.5 ? -1 : 1) * 1024 * Math.random();
		fighter.scale.set(0);
		fighter.z = 2732;
		fighter.y = 512;
		enemies.push(fighter);
		game.addChild(fighter);
	}
	spaceship.x = 2048 / 2; // Center spaceship horizontally
	spaceship.y = 2732 - spaceship.height / 2; // Position spaceship near the bottom of the screen
	cockpitDisplay = game.addChild(new CockpitDisplay());
	cockpitDisplay.x = 2048 / 2; // Center cockpit display horizontally
	if (isDebug) {
		var debugMarker = LK.getAsset('debugMarker', {
			anchorX: 0.5,
			anchorY: 0.5,
			x: 2048 * 0.5,
			y: 2732
		});
		game.addChild(debugMarker);
		fpsText = new Text2('FPS: 0', {
			size: 50,
			fill: "#ffffff"
		});
		// Position FPS text at the bottom-right corner
		fpsText.anchor.set(1, 1); // Anchor to the bottom-right
		LK.gui.bottomRight.addChild(fpsText);
		// Update FPS display every second
		lastTick = Date.now();
		frameCount = 0;
		// Debug text to display cube information
		debugText = new Text2('Debug Info', {
			size: 50,
			fill: "#ffffff"
		});
		debugText.anchor.set(0.5, 0); // Anchor to the bottom-right
		LK.gui.top.addChild(debugText);
	}
	initMenuState();
}
// GAME MENU
function initMenuState() {
	log("initMenuState...");
	gameState = GAME_STATE.MENU;
	log("bgMusic volume", bgMusic.volume);
}
function handleMenuLoop() {
	// Menu animations here
	starFieldAnimation(); // Call the animation function within the game tick
}
function cleanMenuState() {
	log("cleanMenuState...");
}
// STARTING
function initStartingState() {
	log("initStartingState...");
	gameState = GAME_STATE.STARTING;
	// Round preparation logic here.
	// TEMPORARY.
	cleanStartingState();
	initPlayingState();
}
function handleStartingLoop() {
	// Round Starting animations here
}
function cleanStartingState() {
	log("cleanStartingState...");
}
// PLAYING
function initPlayingState() {
	log("initPlayingState...");
	gameState = GAME_STATE.PLAYING;
}
function handlePlayingLoop() {
	loopBgMusic();
	handleGlobalMovement();
	starFieldAnimation();
	handleBulletsLifeCycle();
	// Update enemy fighters
	for (var i = enemies.length - 1; i >= 0; i--) {
		if (enemies[i].z < -500 || enemies[i].x < 0 || enemies[i].x > 2048 || enemies[i].y < 0 || enemies[i].y > 2732) {
			enemies.splice(i, 1);
			// Respawn a new fighter
			var newFighter = new Fighter();
			newFighter.x = 1024 + (Math.random() > 0.5 ? -1 : 1) * 512 * Math.random();
			newFighter.z = 5000;
			newFighter.y = 1024 - 512 * Math.random();
			enemies.push(newFighter);
			game.addChildAt(newFighter, 0);
		}
	}
	// Update angles at a lower rate using modulo on ticks
	if (LK.ticks % 15 == 0) {
		current3DSpaceAngles.horizontalAngle += current3DSpaceAngles.deltaH;
		current3DSpaceAngles.verticalAngle += current3DSpaceAngles.deltaV;
	}
	// Rotate cockpitDisplay based on current3DSpaceAngles.horizontalAngle
	if (cockpitDisplay.cockpitBase) {
		cockpitDisplay.cockpitBase.rotation += -current3DSpaceAngles.deltaH - cockpitDisplay.cockpitBase.rotation >= 0.02 ? 0.1 : 0;
		cockpitDisplay.cockpitBase.rotation += -current3DSpaceAngles.deltaH - cockpitDisplay.cockpitBase.rotation <= -0.02 ? -0.1 : 0;
		cockpitDisplay.cockpitBase.rotation = Math.min(Math.PI * 0.3, Math.max(-Math.PI * 0.3, cockpitDisplay.cockpitBase.rotation));
		cockpitDisplay.cockpitBase.scale.y = 1.5 + current3DSpaceAngles.deltaV * 0.5; // Illustrate vertical rotation by scaling the wheel
	}
	if (isDebug) {
		debugText.setText("lives: " + player.lives);
		// FPS
		var now = Date.now();
		frameCount++;
		if (now - lastTick >= 1000) {
			// Update every second
			fpsText.setText('FPS: ' + frameCount);
			frameCount = 0;
			lastTick = now;
		}
	}
}
function cleanPlayingState() {
	log("cleanPlayingState...");
	// TODO Remove elements
}
// SCORE
function initScoreState() {
	log("initScoreState...");
	gameState = GAME_STATE.SCORE;
	// TODO add score elements
	// TEMPORARY : Avoid multiple clicks
	cleanScoreState();
}
function handleScoreLoop() {
	// Score display logic here
}
function cleanScoreState() {
	log("cleanScoreState...");
	LK.showGameOver();
}
/***********************************************************************************/ 
/******************************** MAIN GAME LOOP ***********************************/
/***********************************************************************************/ 
game.update = function () {
	switch (gameState) {
		case GAME_STATE.MENU:
			handleMenuLoop();
			break;
		case GAME_STATE.STARTING:
			handleStartingLoop();
			break;
		case GAME_STATE.PLAYING:
			handlePlayingLoop();
			break;
		case GAME_STATE.SCORE:
			handleScoreLoop();
			break;
	}
};
gameInitialize(); // Initialize the game

===================================================================
--- original.js
+++ change.js
@@ -168,9 +168,12 @@
 		rotation: Math.PI * 0.01
 	});
 	var centralHud = self.attachAsset('aimingCentralHud', {
 		anchorX: 0.5,
-		anchorY: 0.5
+		anchorY: 0.5,
+		alpha: 0.6,
+		y: -100,
+		tint: 0x00FF00
 	});
 	var spaceshipGraphics = self.attachAsset('spaceship', {
 		anchorX: 0.5,
 		anchorY: 0.5
@@ -186,8 +189,25 @@
 		// Update space coordinates
 		spaceship.coords.x += Math.sin(current3DSpaceAngles.horizontalAngle) * spaceship.speed;
 		spaceship.coords.y += Math.cos(current3DSpaceAngles.verticalAngle) * spaceship.speed;
 		spaceship.coords.z += Math.sin(current3DSpaceAngles.verticalAngle) * Math.cos(current3DSpaceAngles.horizontalAngle) * spaceship.speed;
+		self.targetLocked = false;
+		if (!self.centralHud) {
+			self.centralHud = self.attachAsset('aimingCentralHud', {
+				anchorX: 0.5,
+				anchorY: 0.5,
+				alpha: 0.6,
+				y: -100,
+				tint: 0x00FF00
+			});
+		}
+		for (var i = enemies.length - 1; i >= 0; i--) {
+			if (self.centralHud.intersects(enemies[i])) {
+				self.targetLocked = true;
+				break;
+			}
+		}
+		elf.centralHud.tint = self.targetLocked ? 0x00FF00 : 0xFFFFFF;
 	};
 	self.shoot = function () {
 		if (self.isShooting) {
 			return;
@@ -492,8 +512,15 @@
 	bgMusic = LK.getSound('bgMusic');
 	bgMusic.lastPlayTime = 0;
 	initStars();
 	spaceship = game.addChild(new Spaceship());
+	spaceship.centralHud = spaceship.attachAsset('aimingCentralHud', {
+		anchorX: 0.5,
+		anchorY: 0.5,
+		alpha: 0.6,
+		y: -100,
+		tint: 0x00FF00
+	});
 	// Initialize enemy fighters
 	for (var i = 0; i < 1; i++) {
 		var fighter = new Fighter();
 		fighter.x = 1024 + (Math.random() > 0.5 ? -1 : 1) * 1024 * Math.random();
@@ -511,9 +538,9 @@
 		var debugMarker = LK.getAsset('debugMarker', {
 			anchorX: 0.5,
 			anchorY: 0.5,
 			x: 2048 * 0.5,
-			y: 2732 / 2
+			y: 2732
 		});
 		game.addChild(debugMarker);
 		fpsText = new Text2('FPS: 0', {
 			size: 50,