/**** 
* Classes
****/ 
// Define a Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -10;
	self.update = function () {
		self.y += self.speed;
	};
});
// Define an Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyBody = self.attachAsset('enemyBody', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var enemyArms = self.attachAsset('enemyArms', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var enemyLegs = self.attachAsset('enemyLegs', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var enemyHead = self.attachAsset('enemyHead', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	enemyArms.y = -enemyBody.height / 4;
	enemyLegs.y = enemyBody.height / 2;
	enemyHead.y = -enemyBody.height / 2;
	self.speed = 4;
	self.update = function () {
		// Calculate the direction vector between enemy and player
		var dx = player.x - self.x;
		var dy = player.y - self.y;
		var magnitude = Math.sqrt(dx * dx + dy * dy);
		// Normalize the direction vector
		dx /= magnitude;
		dy /= magnitude;
		// Move the enemy towards the player
		self.x += dx * self.speed;
		self.y += dy * self.speed;
	};
});
// Define a NPC class
var NPC = Container.expand(function () {
	var self = Container.call(this);
	var npcHead = self.attachAsset('playerHead', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	npcHead.y = -80;
	var npcBody = self.attachAsset('playerBody', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var npcArms = self.attachAsset('playerArms', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	npcArms.y = -30;
	var npcLegs = self.attachAsset('playerLegs', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	npcLegs.y = 40;
	self.speed = 5;
	self.update = function () {
		// NPC moves randomly across the game
		var newX = self.x + (Math.random() - 0.5) * self.speed;
		var newY = self.y + (Math.random() - 0.5) * self.speed;
		// Check for collision with trees
		for (var i = 0; i < trees.length; i++) {
			var dx = newX - trees[i].x;
			var dy = newY - trees[i].y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			// If the distance is less than the sum of their radii (collision detected)
			if (distance < self.width / 2 + trees[i].width / 2) {
				return; // Skip this movement
			}
		}
		// Update NPC position
		self.x = newX;
		self.y = newY;
		// Ensure NPC stays within game boundaries
		if (self.x < 0) {
			self.x = 0;
		}
		if (self.x > 2048) {
			self.x = 2048;
		}
		if (self.y < 0) {
			self.y = 0;
		}
		if (self.y > 2732) {
			self.y = 2732;
		}
	};
});
//<Assets used in the game will automatically appear here>
// Define a Player class
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerHead = self.attachAsset('playerHead', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	playerHead.y = -80;
	var playerBody = self.attachAsset('playerBody', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var playerArms = self.attachAsset('playerArms', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	playerArms.y = -30;
	var playerLegs = self.attachAsset('playerLegs', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	playerLegs.y = 40;
	self.speed = 5;
	self.update = function () {
		// Player update logic
	};
});
// Define a Tree class
var Tree = Container.expand(function () {
	var self = Container.call(this);
	var treeTrunk = self.attachAsset('treeTrunk', {
		anchorX: 0.5,
		anchorY: 1
	});
	var treeLeaves = self.attachAsset('treeLeaves', {
		anchorX: 0.5,
		anchorY: 1
	});
	treeLeaves.y = -treeTrunk.height;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x0000FF //Init game with blue background
});

/**** 
* Game Code
****/ 
// Initialize player
var player = game.addChild(new Player());
player.x = 2048 / 2;
player.y = 2732 - 150;
// Initialize enemies
var enemies = [];
var enemy = new Enemy();
enemy.x = Math.random() * 2048;
enemy.y = Math.random() * 1000;
enemies.push(enemy);
game.addChild(enemy);
// Initialize 30 trees and spread them across the game
var trees = [];
for (var i = 0; i < 30; i++) {
	var tree = game.addChild(new Tree());
	tree.x = Math.random() * 2048;
	tree.y = Math.random() * 2732;
	trees.push(tree);
}
// Initialize NPC
var npc = game.addChild(new NPC());
npc.x = 2048 / 2;
npc.y = 2732 / 2;
// Initialize bullets
var bullets = [];
// Handle player movement
game.move = function (x, y, obj) {
	player.x = x;
	player.y = y;
};
// Handle shooting
game.down = function (x, y, obj) {
	var bullet = new Bullet();
	bullet.x = player.x;
	bullet.y = player.y;
	bullets.push(bullet);
	game.addChild(bullet);
};
// Game update loop
game.update = function () {
	// Update enemies
	for (var i = 0; i < enemies.length; i++) {
		enemies[i].update();
		if (player.intersects(enemies[i])) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
	}
	// Update bullets
	for (var j = bullets.length - 1; j >= 0; j--) {
		bullets[j].update();
		for (var k = enemies.length - 1; k >= 0; k--) {
			if (bullets[j].intersects(enemies[k])) {
				bullets[j].destroy();
				bullets.splice(j, 1);
				enemies[k].destroy();
				enemies.splice(k, 1);
				break;
			}
		}
		if (bullets[j] && bullets[j].y < -50) {
			bullets[j].destroy();
			bullets.splice(j, 1);
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -73,10 +73,23 @@
 	npcLegs.y = 40;
 	self.speed = 5;
 	self.update = function () {
 		// NPC moves randomly across the game
-		self.x += (Math.random() - 0.5) * self.speed;
-		self.y += (Math.random() - 0.5) * self.speed;
+		var newX = self.x + (Math.random() - 0.5) * self.speed;
+		var newY = self.y + (Math.random() - 0.5) * self.speed;
+		// Check for collision with trees
+		for (var i = 0; i < trees.length; i++) {
+			var dx = newX - trees[i].x;
+			var dy = newY - trees[i].y;
+			var distance = Math.sqrt(dx * dx + dy * dy);
+			// If the distance is less than the sum of their radii (collision detected)
+			if (distance < self.width / 2 + trees[i].width / 2) {
+				return; // Skip this movement
+			}
+		}
+		// Update NPC position
+		self.x = newX;
+		self.y = newY;
 		// Ensure NPC stays within game boundaries
 		if (self.x < 0) {
 			self.x = 0;
 		}