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

/**** 
* Classes
****/ 
// Coin class
var Coin = Container.expand(function () {
	var self = Container.call(this);
	var coinSprite = self.attachAsset('coin', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = coinSprite.width / 2;
	self.collected = false;
	// For collision detection
	self.getBounds = function () {
		return {
			x: self.x - self.radius,
			y: self.y - self.radius,
			width: self.radius * 2,
			height: self.radius * 2
		};
	};
	// Animate coin (optional: simple rotation)
	self.update = function () {
		if (coinSprite) coinSprite.rotation += 0.13;
	};
	return self;
});
// PipePair class
var PipePair = Container.expand(function () {
	var self = Container.call(this);
	// Top pipe
	var topPipe = self.attachAsset('pipe', {
		anchorX: 0,
		anchorY: 1
	});
	// Bottom pipe
	var bottomPipe = self.attachAsset('pipe', {
		anchorX: 0,
		anchorY: 0
	});
	self.topPipe = topPipe;
	self.bottomPipe = bottomPipe;
	// Add coin in the gap
	var coin = new Coin();
	self.coin = coin;
	self.addChild(coin);
	// Set pipes' positions based on gapY
	self.setGap = function (gapY) {
		// gapY is the vertical center of the gap
		var gapTop = gapY - gapHeight / 2;
		var gapBottom = gapY + gapHeight / 2;
		topPipe.x = 0;
		topPipe.y = gapTop;
		topPipe.height = gapTop;
		bottomPipe.x = 0;
		bottomPipe.y = gapBottom;
		bottomPipe.height = 2732 - gapBottom - groundHeight;
		// Place coin in the center of the gap
		coin.x = pipeWidth / 2;
		coin.y = gapY;
		coin.collected = false;
		coin.visible = true;
	};
	// For collision detection
	self.getTopBounds = function () {
		return {
			x: self.x,
			y: 0,
			width: topPipe.width,
			height: topPipe.y
		};
	};
	self.getBottomBounds = function () {
		return {
			x: self.x,
			y: bottomPipe.y,
			width: bottomPipe.width,
			height: bottomPipe.height
		};
	};
	// Used to check if player has passed this pipe
	self.passed = false;
	return self;
});
// Player class
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerSprite = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = playerSprite.width / 2;
	self.vy = 0; // vertical velocity
	// For collision detection
	self.getBounds = function () {
		return {
			x: self.x - self.radius,
			y: self.y - self.radius,
			width: self.radius * 2,
			height: self.radius * 2
		};
	};
	// Update position and apply gravity
	self.update = function () {
		self.vy += gravity;
		self.y += self.vy;
		// Smooth rotation for gliding effect
		// Clamp rotation between -0.5 (up) and 1.2 (down)
		var targetRotation = Math.max(-0.5, Math.min(1.2, self.vy / 40));
		if (typeof self.rotation === "undefined") self.rotation = 0;
		// Smoothly interpolate rotation for a natural look
		self.rotation += (targetRotation - self.rotation) * 0.18;
		// Apply rotation to sprite
		if (playerSprite) playerSprite.rotation = self.rotation;
		// Clamp to top of screen
		if (self.y - self.radius < 0) {
			self.y = self.radius;
			self.vy = 0;
		}
	};
	// Jump
	self.flap = function () {
		self.vy = jumpVelocity;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87ceeb // Sky blue
});

/**** 
* Game Code
****/ 
// Ground
// Pipe (green)
// Character (bird/ball)
// Constants
var gravity = 1.1; // Reduced gravity for slower fall
var jumpVelocity = -32; // Slightly less strong jump for smoother arc
var pipeSpeed = 16;
var pipeInterval = 90; // frames between pipes
var gapHeight = 820;
var groundHeight = 120;
var pipeWidth = 220;
// Game state
var player;
var pipes = [];
var coins = [];
var ground;
var score = 0;
var scoreTxt;
var lastPipeTick = 0;
var gameStarted = false;
var gameOver = false;
// Create ground
ground = LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 2732 - groundHeight
});
game.addChild(ground);
// Create player
player = new Player();
player.x = 420;
player.y = 2732 / 2;
game.addChild(player);
// Score text
scoreTxt = new Text2('0', {
	size: 180,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Reset function
function resetGame() {
	// Remove pipes
	for (var i = pipes.length - 1; i >= 0; i--) {
		pipes[i].destroy();
		pipes.splice(i, 1);
	}
	coins = [];
	// Reset player
	player.x = 420;
	player.y = 2732 / 2;
	player.vy = 0;
	// Reset score
	score = 0;
	scoreTxt.setText(score);
	lastPipeTick = LK.ticks;
	gameStarted = false;
	gameOver = false;
}
// Start game on first tap
game.down = function (x, y, obj) {
	if (gameOver) return;
	player.flap();
	if (!gameStarted) {
		gameStarted = true;
	}
};
// Main update loop
game.update = function () {
	if (gameOver) return;
	if (gameStarted) {
		player.update();
		// Move pipes and check for collisions
		for (var i = pipes.length - 1; i >= 0; i--) {
			var pipePair = pipes[i];
			pipePair.x -= pipeSpeed;
			// Move coin with pipe
			if (pipePair.coin) {
				pipePair.coin.x = pipeWidth / 2;
				pipePair.coin.update && pipePair.coin.update();
			}
			// Remove pipes that have gone off screen
			if (pipePair.x + pipeWidth < 0) {
				if (pipePair.coin && coins.indexOf(pipePair.coin) !== -1) {
					coins.splice(coins.indexOf(pipePair.coin), 1);
				}
				pipePair.destroy();
				pipes.splice(i, 1);
				continue;
			}
			// Check for collision with player
			var pBounds = player.getBounds();
			var tBounds = pipePair.getTopBounds();
			var bBounds = pipePair.getBottomBounds();
			if (rectsIntersect(pBounds, tBounds) || rectsIntersect(pBounds, bBounds)) {
				endGame();
				return;
			}
			// Check if player passed the pipe for scoring
			if (!pipePair.passed && pipePair.x + pipeWidth < player.x - player.radius) {
				pipePair.passed = true;
				score += 1;
				scoreTxt.setText(score);
			}
			// Coin collection
			if (pipePair.coin && !pipePair.coin.collected && pipePair.coin.visible) {
				var coinBounds = pipePair.coin.getBounds();
				if (rectsIntersect(pBounds, coinBounds)) {
					pipePair.coin.collected = true;
					pipePair.coin.visible = false;
					score += 1;
					scoreTxt.setText(score);
				}
			}
		}
		// Add new pipes
		if (LK.ticks - lastPipeTick >= pipeInterval) {
			var gapY = getRandomGapY();
			var pipePair = new PipePair();
			pipePair.x = 2048;
			pipePair.setGap(gapY);
			pipes.push(pipePair);
			if (pipePair.coin) {
				coins.push(pipePair.coin);
			}
			game.addChild(pipePair);
			lastPipeTick = LK.ticks;
		}
		// Check collision with ground
		if (player.y + player.radius >= 2732 - groundHeight) {
			player.y = 2732 - groundHeight - player.radius;
			endGame();
			return;
		}
	}
};
// End game
function endGame() {
	gameOver = true;
	LK.effects.flashScreen(0xff0000, 600);
	LK.showGameOver();
}
// Utility: Rectangle intersection
function rectsIntersect(a, b) {
	return a.x < b.x + b.width && a.x + a.width > b.x && a.y < b.y + b.height && a.y + a.height > b.y;
}
// Utility: Random gap Y position (avoid too close to top/bottom)
function getRandomGapY() {
	var minY = gapHeight / 2 + 120;
	var maxY = 2732 - groundHeight - gapHeight / 2 - 120;
	return minY + Math.floor(Math.random() * (maxY - minY));
}
// Reset game on game over
LK.on('gameover', function () {
	resetGame();
});
// Initial reset
resetGame();

===================================================================
--- original.js
+++ change.js
@@ -5,8 +5,32 @@
 
 /**** 
 * Classes
 ****/ 
+// Coin class
+var Coin = Container.expand(function () {
+	var self = Container.call(this);
+	var coinSprite = self.attachAsset('coin', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	self.radius = coinSprite.width / 2;
+	self.collected = false;
+	// For collision detection
+	self.getBounds = function () {
+		return {
+			x: self.x - self.radius,
+			y: self.y - self.radius,
+			width: self.radius * 2,
+			height: self.radius * 2
+		};
+	};
+	// Animate coin (optional: simple rotation)
+	self.update = function () {
+		if (coinSprite) coinSprite.rotation += 0.13;
+	};
+	return self;
+});
 // PipePair class
 var PipePair = Container.expand(function () {
 	var self = Container.call(this);
 	// Top pipe
@@ -20,8 +44,12 @@
 		anchorY: 0
 	});
 	self.topPipe = topPipe;
 	self.bottomPipe = bottomPipe;
+	// Add coin in the gap
+	var coin = new Coin();
+	self.coin = coin;
+	self.addChild(coin);
 	// Set pipes' positions based on gapY
 	self.setGap = function (gapY) {
 		// gapY is the vertical center of the gap
 		var gapTop = gapY - gapHeight / 2;
@@ -31,8 +59,13 @@
 		topPipe.height = gapTop;
 		bottomPipe.x = 0;
 		bottomPipe.y = gapBottom;
 		bottomPipe.height = 2732 - gapBottom - groundHeight;
+		// Place coin in the center of the gap
+		coin.x = pipeWidth / 2;
+		coin.y = gapY;
+		coin.collected = false;
+		coin.visible = true;
 	};
 	// For collision detection
 	self.getTopBounds = function () {
 		return {
@@ -120,8 +153,9 @@
 var pipeWidth = 220;
 // Game state
 var player;
 var pipes = [];
+var coins = [];
 var ground;
 var score = 0;
 var scoreTxt;
 var lastPipeTick = 0;
@@ -153,8 +187,9 @@
 	for (var i = pipes.length - 1; i >= 0; i--) {
 		pipes[i].destroy();
 		pipes.splice(i, 1);
 	}
+	coins = [];
 	// Reset player
 	player.x = 420;
 	player.y = 2732 / 2;
 	player.vy = 0;
@@ -181,10 +216,18 @@
 		// Move pipes and check for collisions
 		for (var i = pipes.length - 1; i >= 0; i--) {
 			var pipePair = pipes[i];
 			pipePair.x -= pipeSpeed;
+			// Move coin with pipe
+			if (pipePair.coin) {
+				pipePair.coin.x = pipeWidth / 2;
+				pipePair.coin.update && pipePair.coin.update();
+			}
 			// Remove pipes that have gone off screen
 			if (pipePair.x + pipeWidth < 0) {
+				if (pipePair.coin && coins.indexOf(pipePair.coin) !== -1) {
+					coins.splice(coins.indexOf(pipePair.coin), 1);
+				}
 				pipePair.destroy();
 				pipes.splice(i, 1);
 				continue;
 			}
@@ -201,16 +244,29 @@
 				pipePair.passed = true;
 				score += 1;
 				scoreTxt.setText(score);
 			}
+			// Coin collection
+			if (pipePair.coin && !pipePair.coin.collected && pipePair.coin.visible) {
+				var coinBounds = pipePair.coin.getBounds();
+				if (rectsIntersect(pBounds, coinBounds)) {
+					pipePair.coin.collected = true;
+					pipePair.coin.visible = false;
+					score += 1;
+					scoreTxt.setText(score);
+				}
+			}
 		}
 		// Add new pipes
 		if (LK.ticks - lastPipeTick >= pipeInterval) {
 			var gapY = getRandomGapY();
 			var pipePair = new PipePair();
 			pipePair.x = 2048;
 			pipePair.setGap(gapY);
 			pipes.push(pipePair);
+			if (pipePair.coin) {
+				coins.push(pipePair.coin);
+			}
 			game.addChild(pipePair);
 			lastPipeTick = LK.ticks;
 		}
 		// Check collision with ground