/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* Classes
****/ 
var Projectile = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('projectile', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 8;
	self.target = null;
	self.damage = 20;
	self.update = function () {
		if (!self.target || self.target.destroyed) {
			self.destroy();
			return;
		}
		var dx = self.target.x - self.x;
		var dy = self.target.y - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance < 20) {
			self.target.takeDamage(self.damage);
			self.destroy();
		} else {
			self.x += dx / distance * self.speed;
			self.y += dy / distance * self.speed;
		}
	};
	self.destroy = function () {
		for (var i = projectiles.length - 1; i >= 0; i--) {
			if (projectiles[i] === self) {
				projectiles.splice(i, 1);
				break;
			}
		}
		if (self.parent) {
			self.parent.removeChild(self);
		}
	};
	return self;
});
var Spirit = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('spirit', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.health = 50;
	self.maxHealth = 50;
	self.speed = 1;
	self.gold = 10;
	self.targetX = villageX;
	self.targetY = villageY;
	self.update = function () {
		var dx = self.targetX - self.x;
		var dy = self.targetY - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance > 5) {
			self.x += dx / distance * self.speed;
			self.y += dy / distance * self.speed;
		} else {
			self.reachVillage();
		}
	};
	self.takeDamage = function (damage) {
		self.health -= damage;
		LK.getSound('spirit_hit').play();
		if (self.health <= 0) {
			self.die();
		}
	};
	self.die = function () {
		gold += self.gold;
		goldText.setText('Gold: ' + gold);
		LK.getSound('spirit_death').play();
		for (var i = spirits.length - 1; i >= 0; i--) {
			if (spirits[i] === self) {
				spirits.splice(i, 1);
				break;
			}
		}
		self.destroy();
	};
	self.reachVillage = function () {
		villageHealth -= 10;
		healthText.setText('Health: ' + villageHealth);
		if (villageHealth <= 0) {
			LK.showGameOver();
		}
		for (var i = spirits.length - 1; i >= 0; i--) {
			if (spirits[i] === self) {
				spirits.splice(i, 1);
				break;
			}
		}
		self.destroy();
	};
	return self;
});
var Tower = Container.expand(function () {
	var self = Container.call(this);
	var graphics = self.attachAsset('tower', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.range = 150;
	self.damage = 20;
	self.fireRate = 60; // frames between shots
	self.lastShot = 0;
	self.level = 1;
	self.update = function () {
		self.lastShot++;
		if (self.lastShot >= self.fireRate) {
			var target = self.findTarget();
			if (target) {
				self.shoot(target);
				self.lastShot = 0;
			}
		}
	};
	self.findTarget = function () {
		var closestSpirit = null;
		var closestDistance = self.range;
		for (var i = 0; i < spirits.length; i++) {
			var spirit = spirits[i];
			var dx = spirit.x - self.x;
			var dy = spirit.y - self.y;
			var distance = Math.sqrt(dx * dx + dy * dy);
			if (distance <= self.range && distance < closestDistance) {
				closestDistance = distance;
				closestSpirit = spirit;
			}
		}
		return closestSpirit;
	};
	self.shoot = function (target) {
		var projectile = new Projectile();
		projectile.x = self.x;
		projectile.y = self.y;
		projectile.target = target;
		projectile.damage = self.damage;
		projectiles.push(projectile);
		gameWorld.addChild(projectile);
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2F4F2F
});

/**** 
* Game Code
****/ 
var gameWorld = new Container();
game.addChild(gameWorld);
var gameWorldX = 0;
var gameWorldY = 0;
var isDragging = false;
var lastDragX = 0;
var lastDragY = 0;
var villageX = 0;
var villageY = 0;
var villageHealth = 100;
var gold = 100;
var wave = 1;
var spiritsToSpawn = 5;
var spiritsSpawned = 0;
var spawnTimer = 0;
var towers = [];
var spirits = [];
var projectiles = [];
var placementMode = false;
var placementPreview = null;
// Create village at center
var village = gameWorld.attachAsset('village', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: villageX,
	y: villageY
});
// UI Elements
var goldText = new Text2('Gold: ' + gold, {
	size: 60,
	fill: 0xFFD700
});
goldText.anchor.set(0, 0);
LK.gui.topRight.addChild(goldText);
var healthText = new Text2('Health: ' + villageHealth, {
	size: 60,
	fill: 0xFF0000
});
healthText.anchor.set(0, 0);
healthText.y = 70;
LK.gui.topRight.addChild(healthText);
var waveText = new Text2('Wave: ' + wave, {
	size: 60,
	fill: 0xFFFFFF
});
waveText.anchor.set(0.5, 0);
LK.gui.top.addChild(waveText);
var buildButton = new Text2('Build Tower (50g)', {
	size: 50,
	fill: 0x00FF00
});
buildButton.anchor.set(0.5, 1);
LK.gui.bottom.addChild(buildButton);
function canPlaceTower(x, y) {
	// Check distance from village
	var dx = x - villageX;
	var dy = y - villageY;
	var distanceFromVillage = Math.sqrt(dx * dx + dy * dy);
	if (distanceFromVillage < 150) {
		return false;
	}
	// Check distance from other towers
	for (var i = 0; i < towers.length; i++) {
		var tower = towers[i];
		var tdx = x - tower.x;
		var tdy = y - tower.y;
		var distanceFromTower = Math.sqrt(tdx * tdx + tdy * tdy);
		if (distanceFromTower < 80) {
			return false;
		}
	}
	return true;
}
function spawnSpirit() {
	if (spiritsSpawned >= spiritsToSpawn) {
		return;
	}
	var spirit = new Spirit();
	// Spawn from random edge
	var edge = Math.floor(Math.random() * 4);
	var mapSize = 1500;
	switch (edge) {
		case 0:
			// Top
			spirit.x = Math.random() * mapSize - mapSize / 2;
			spirit.y = -mapSize / 2;
			break;
		case 1:
			// Right
			spirit.x = mapSize / 2;
			spirit.y = Math.random() * mapSize - mapSize / 2;
			break;
		case 2:
			// Bottom
			spirit.x = Math.random() * mapSize - mapSize / 2;
			spirit.y = mapSize / 2;
			break;
		case 3:
			// Left
			spirit.x = -mapSize / 2;
			spirit.y = Math.random() * mapSize - mapSize / 2;
			break;
	}
	spirits.push(spirit);
	gameWorld.addChild(spirit);
	spiritsSpawned++;
}
function nextWave() {
	if (spirits.length === 0 && spiritsSpawned >= spiritsToSpawn) {
		wave++;
		spiritsToSpawn = 5 + wave * 2;
		spiritsSpawned = 0;
		spawnTimer = 0;
		waveText.setText('Wave: ' + wave);
		// Bonus gold for completing wave
		gold += 20;
		goldText.setText('Gold: ' + gold);
	}
}
game.down = function (x, y, obj) {
	var localPos = gameWorld.toLocal(game.toGlobal({
		x: x,
		y: y
	}));
	if (placementMode) {
		if (canPlaceTower(localPos.x, localPos.y) && gold >= 50) {
			var tower = new Tower();
			tower.x = localPos.x;
			tower.y = localPos.y;
			towers.push(tower);
			gameWorld.addChild(tower);
			gold -= 50;
			goldText.setText('Gold: ' + gold);
			LK.getSound('place_tower').play();
			placementMode = false;
			if (placementPreview) {
				placementPreview.destroy();
				placementPreview = null;
			}
		}
	} else {
		isDragging = true;
		lastDragX = x;
		lastDragY = y;
	}
};
game.move = function (x, y, obj) {
	var localPos = gameWorld.toLocal(game.toGlobal({
		x: x,
		y: y
	}));
	if (placementMode) {
		if (placementPreview) {
			placementPreview.destroy();
		}
		if (canPlaceTower(localPos.x, localPos.y)) {
			placementPreview = gameWorld.attachAsset('validPlacement', {
				anchorX: 0.5,
				anchorY: 0.5,
				x: localPos.x,
				y: localPos.y,
				alpha: 0.5
			});
		} else {
			placementPreview = gameWorld.attachAsset('invalidPlacement', {
				anchorX: 0.5,
				anchorY: 0.5,
				x: localPos.x,
				y: localPos.y,
				alpha: 0.5
			});
		}
	} else if (isDragging) {
		var deltaX = x - lastDragX;
		var deltaY = y - lastDragY;
		gameWorldX += deltaX;
		gameWorldY += deltaY;
		// Limit scrolling
		gameWorldX = Math.max(-1000, Math.min(1000, gameWorldX));
		gameWorldY = Math.max(-1000, Math.min(1000, gameWorldY));
		gameWorld.x = gameWorldX;
		gameWorld.y = gameWorldY;
		lastDragX = x;
		lastDragY = y;
	}
};
game.up = function (x, y, obj) {
	isDragging = false;
};
buildButton.down = function (x, y, obj) {
	if (gold >= 50) {
		placementMode = !placementMode;
		if (!placementMode && placementPreview) {
			placementPreview.destroy();
			placementPreview = null;
		}
	}
};
game.update = function () {
	// Spawn spirits
	spawnTimer++;
	if (spawnTimer >= 120) {
		// Spawn every 2 seconds
		spawnSpirit();
		spawnTimer = 0;
	}
	// Check for next wave
	nextWave();
	// Update all game objects
	for (var i = 0; i < towers.length; i++) {
		towers[i].update();
	}
	for (var i = 0; i < spirits.length; i++) {
		spirits[i].update();
	}
	for (var i = 0; i < projectiles.length; i++) {
		projectiles[i].update();
	}
};

===================================================================
--- original.js
+++ change.js
@@ -279,9 +279,12 @@
 		goldText.setText('Gold: ' + gold);
 	}
 }
 game.down = function (x, y, obj) {
-	var localPos = gameWorld.toLocal(obj.parent.toGlobal(obj.position));
+	var localPos = gameWorld.toLocal(game.toGlobal({
+		x: x,
+		y: y
+	}));
 	if (placementMode) {
 		if (canPlaceTower(localPos.x, localPos.y) && gold >= 50) {
 			var tower = new Tower();
 			tower.x = localPos.x;
@@ -303,9 +306,12 @@
 		lastDragY = y;
 	}
 };
 game.move = function (x, y, obj) {
-	var localPos = gameWorld.toLocal(obj.parent.toGlobal(obj.position));
+	var localPos = gameWorld.toLocal(game.toGlobal({
+		x: x,
+		y: y
+	}));
 	if (placementMode) {
 		if (placementPreview) {
 			placementPreview.destroy();
 		}