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

/**** 
* Classes
****/ 
var Bird = Container.expand(function () {
	var self = Container.call(this);
	var birdGraphics = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.velocity = 0;
	self.gravity = 0.4;
	self.flapPower = -12;
	self.flap = function () {
		self.velocity = self.flapPower;
		LK.getSound('flap').play();
		// Add flap animation
		tween(birdGraphics, {
			rotation: -0.3
		}, {
			duration: 100
		});
		tween(birdGraphics, {
			rotation: 0.3
		}, {
			duration: 200,
			onFinish: function onFinish() {
				tween(birdGraphics, {
					rotation: 0
				}, {
					duration: 100
				});
			}
		});
	};
	self.update = function () {
		// Only apply physics when game has started
		if (gameStarted) {
			self.velocity += self.gravity;
			self.y += self.velocity;
			// Rotate bird based on velocity
			if (self.velocity > 0) {
				birdGraphics.rotation = Math.min(self.velocity * 0.05, 0.5);
			} else {
				birdGraphics.rotation = Math.max(self.velocity * 0.05, -0.5);
			}
		}
	};
	return self;
});
var Cloud = Container.expand(function () {
	var self = Container.call(this);
	// Create cloud using a white ellipse
	var cloudGraphics = self.attachAsset('cloud', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -1.5; // Slower than pipes for parallax effect
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});
var Pipe = Container.expand(function () {
	var self = Container.call(this);
	self.speed = -4;
	self.gapHeight = 300;
	self.scored = false;
	// Create top pipe
	self.topPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 1
	});
	// Create bottom pipe
	self.bottomPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 0
	});
	self.setGapPosition = function (gapY) {
		self.topPipe.y = gapY - self.gapHeight / 2;
		self.bottomPipe.y = gapY + self.gapHeight / 2;
	};
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87CEEB
});

/**** 
* Game Code
****/ 
// Game variables
var bird;
var pipes = [];
var clouds = [];
var ground;
var gameStarted = false;
var gameActive = false;
var pipeTimer = 0;
var pipeInterval = 90; // frames between pipes
var cloudTimer = 0;
var cloudInterval = 120; // frames between clouds
// Create ground
ground = game.addChild(LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 1,
	x: 0,
	y: 2732
}));
// Create bird
bird = game.addChild(new Bird());
bird.x = 400;
bird.y = 1366; // Center of screen vertically
// Create score display
var scoreTxt = new Text2('0', {
	size: 100,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
scoreTxt.y = 150;
// Create start instruction
var startTxt = new Text2('TAP TO START', {
	size: 80,
	fill: 0xFFFFFF
});
startTxt.anchor.set(0.5, 0.5);
LK.gui.center.addChild(startTxt);
// Create initial clouds for immediate visual effect
for (var i = 0; i < 3; i++) {
	var cloud = new Cloud();
	cloud.x = Math.random() * 2048;
	cloud.y = 200 + Math.random() * 800;
	var scale = 0.8 + Math.random() * 0.6;
	cloud.scaleX = scale;
	cloud.scaleY = scale;
	cloud.alpha = 0.6 + Math.random() * 0.3;
	clouds.push(cloud);
	game.addChild(cloud);
}
function createPipe() {
	var pipe = new Pipe();
	pipe.x = 2048 + 60; // Start off right edge
	// Random gap position (avoid too high or too low)
	var minGapY = 200;
	var maxGapY = 2532; // Account for ground height
	var gapY = minGapY + Math.random() * (maxGapY - minGapY);
	pipe.setGapPosition(gapY);
	pipes.push(pipe);
	game.addChild(pipe);
}
function createCloud() {
	var cloud = new Cloud();
	cloud.x = 2048 + 100; // Start off right edge
	// Random Y position in upper part of screen
	cloud.y = 200 + Math.random() * 800;
	// Random scale for variety
	var scale = 0.8 + Math.random() * 0.6;
	cloud.scaleX = scale;
	cloud.scaleY = scale;
	// Random opacity for depth effect
	cloud.alpha = 0.6 + Math.random() * 0.3;
	clouds.push(cloud);
	game.addChild(cloud);
}
function checkCollisions() {
	// Check ground collision
	if (bird.y + 30 >= 2632) {
		// Ground level minus bird radius
		return true;
	}
	// Check ceiling collision
	if (bird.y - 30 <= 0) {
		return true;
	}
	// Check pipe collisions
	for (var i = 0; i < pipes.length; i++) {
		var pipe = pipes[i];
		// Check if bird is in horizontal range of pipe
		if (bird.x + 30 > pipe.x - 60 && bird.x - 30 < pipe.x + 60) {
			// Check top pipe collision
			if (bird.y - 30 < pipe.topPipe.y) {
				return true;
			}
			// Check bottom pipe collision
			if (bird.y + 30 > pipe.bottomPipe.y) {
				return true;
			}
		}
	}
	return false;
}
function updateScore() {
	for (var i = 0; i < pipes.length; i++) {
		var pipe = pipes[i];
		// Check if bird passed this pipe
		if (!pipe.scored && bird.x > pipe.x + 60) {
			pipe.scored = true;
			LK.setScore(LK.getScore() + 1);
			scoreTxt.setText(LK.getScore());
			LK.getSound('score').play();
		}
	}
}
// Game input handling
game.down = function (x, y, obj) {
	if (!gameStarted) {
		gameStarted = true;
		gameActive = true;
		startTxt.visible = false;
		// Reset bird velocity for clean start
		bird.velocity = 0;
	}
	if (gameActive) {
		bird.flap();
	}
};
// Main game loop
game.update = function () {
	if (!gameActive) {
		return;
	}
	// Update bird
	bird.update();
	// Check collisions
	if (checkCollisions()) {
		gameActive = false;
		LK.showGameOver();
		return;
	}
	// Update score
	updateScore();
	// Create new pipes
	pipeTimer++;
	if (pipeTimer >= pipeInterval) {
		createPipe();
		pipeTimer = 0;
	}
	// Create new clouds
	cloudTimer++;
	if (cloudTimer >= cloudInterval) {
		createCloud();
		cloudTimer = 0;
	}
	// Update and clean up pipes
	for (var i = pipes.length - 1; i >= 0; i--) {
		var pipe = pipes[i];
		pipe.update();
		// Remove pipes that are off screen
		if (pipe.x < -120) {
			pipe.destroy();
			pipes.splice(i, 1);
		}
	}
	// Update and clean up clouds
	for (var i = clouds.length - 1; i >= 0; i--) {
		var cloud = clouds[i];
		cloud.update();
		// Remove clouds that are off screen
		if (cloud.x < -150) {
			cloud.destroy();
			clouds.splice(i, 1);
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -37,15 +37,18 @@
 			}
 		});
 	};
 	self.update = function () {
-		self.velocity += self.gravity;
-		self.y += self.velocity;
-		// Rotate bird based on velocity
-		if (self.velocity > 0) {
-			birdGraphics.rotation = Math.min(self.velocity * 0.05, 0.5);
-		} else {
-			birdGraphics.rotation = Math.max(self.velocity * 0.05, -0.5);
+		// Only apply physics when game has started
+		if (gameStarted) {
+			self.velocity += self.gravity;
+			self.y += self.velocity;
+			// Rotate bird based on velocity
+			if (self.velocity > 0) {
+				birdGraphics.rotation = Math.min(self.velocity * 0.05, 0.5);
+			} else {
+				birdGraphics.rotation = Math.max(self.velocity * 0.05, -0.5);
+			}
 		}
 	};
 	return self;
 });
@@ -215,8 +218,10 @@
 	if (!gameStarted) {
 		gameStarted = true;
 		gameActive = true;
 		startTxt.visible = false;
+		// Reset bird velocity for clean start
+		bird.velocity = 0;
 	}
 	if (gameActive) {
 		bird.flap();
 	}