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

/**** 
* Classes
****/ 
// Bird class
var Bird = Container.expand(function () {
	var self = Container.call(this);
	// Attach a yellow ellipse as the bird
	var birdAsset = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Physics properties
	self.velocityY = 0;
	self.gravity = 1.2; // Gravity per frame
	self.flapStrength = -28; // Negative for upward movement
	// Bird size for collision
	self.radius = birdAsset.width * 0.45;
	// Flap method
	self.flap = function () {
		self.velocityY = self.flapStrength;
	};
	// Update method called every frame
	self.update = function () {
		self.velocityY += self.gravity;
		self.y += self.velocityY;
		// Clamp rotation for visual feedback
		var maxAngle = Math.PI / 4;
		var minAngle = -Math.PI / 3;
		var angle = self.velocityY * 0.03;
		if (angle > maxAngle) angle = maxAngle;
		if (angle < minAngle) angle = minAngle;
		birdAsset.rotation = angle;
	};
	return self;
});
// PipePair class (top and bottom pipes)
var PipePair = Container.expand(function () {
	var self = Container.call(this);
	// Pipe properties
	self.pipeWidth = 220;
	self.gapHeight = 720;
	self.speed = 12; // Speed at which pipes move left
	// Randomize gap position
	var minGapY = 400;
	var maxGapY = 2732 - 400 - self.gapHeight;
	self.gapY = minGapY + Math.floor(Math.random() * (maxGapY - minGapY + 1));
	// Top pipe
	var topPipe = self.attachAsset('pipe', {
		anchorX: 0,
		anchorY: 1,
		width: self.pipeWidth,
		height: self.gapY,
		color: 0x4ec04e,
		shape: 'box'
	});
	topPipe.x = 0;
	topPipe.y = self.gapY;
	// Bottom pipe
	var bottomPipe = self.attachAsset('pipe', {
		anchorX: 0,
		anchorY: 0,
		width: self.pipeWidth,
		height: 2732 - (self.gapY + self.gapHeight),
		color: 0x4ec04e,
		shape: 'box'
	});
	bottomPipe.x = 0;
	bottomPipe.y = self.gapY + self.gapHeight;
	// For scoring: has the bird passed this pipe?
	self.passed = false;
	// Update method
	self.update = function () {
		self.x -= self.speed;
	};
	// Helper for collision rectangles
	self.getRects = function () {
		return [
		// Top pipe
		{
			x: self.x,
			y: 0,
			width: self.pipeWidth,
			height: self.gapY
		},
		// Bottom pipe
		{
			x: self.x,
			y: self.gapY + self.gapHeight,
			width: self.pipeWidth,
			height: 2732 - (self.gapY + self.gapHeight)
		}];
	};
	return self;
});

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

/**** 
* Game Code
****/ 
// Tween plugin for smooth animations (optional, but included for future use)
// Centered ground height
var groundHeight = 220;
// Bird setup
var bird = new Bird();
bird.x = 2048 * 0.32;
bird.y = 2732 * 0.5;
game.addChild(bird);
// Pipes array
var pipes = [];
// Score
var score = 0;
var scoreTxt = new Text2('0', {
	size: 180,
	fill: 0xFFF700
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Ground (invisible, for collision)
var groundY = 2732 - groundHeight;
// Add ground visual (optional, but makes it clear)
var ground = LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0,
	width: 2048,
	height: groundHeight,
	color: 0xeecb7a,
	shape: 'box',
	y: groundY,
	x: 0
});
game.addChild(ground);
// Add green grass strip on top of the ground
var grassHeight = 48;
var grass = LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0,
	width: 2048,
	height: grassHeight,
	color: 0x4ec04e,
	shape: 'box',
	y: groundY,
	x: 0
});
game.addChild(grass);
// Pipe spawn timer
var pipeInterval = 90; // Frames between pipes
var pipeTimer = 0;
// Game state
var isAlive = true;
var started = false;
// Tap/flap handler
function flapHandler(x, y, obj) {
	if (!isAlive) return;
	if (!started) {
		started = true;
	}
	bird.flap();
}
game.down = flapHandler;
// Main update loop
game.update = function () {
	if (!isAlive) return;
	// Only update bird physics if started
	if (started) {
		bird.update();
	}
	// Spawn pipes
	if (started) {
		pipeTimer++;
		if (pipeTimer >= pipeInterval) {
			pipeTimer = 0;
			var pipe = new PipePair();
			pipe.x = 2048;
			game.addChild(pipe);
			pipes.push(pipe);
		}
	}
	// Update pipes and check for off-screen
	for (var i = pipes.length - 1; i >= 0; i--) {
		var pipe = pipes[i];
		pipe.update();
		// Remove pipes that are off screen
		if (pipe.x + pipe.pipeWidth < 0) {
			pipe.destroy();
			pipes.splice(i, 1);
			continue;
		}
		// Scoring: if bird passed the pipe
		if (!pipe.passed && pipe.x + pipe.pipeWidth < bird.x) {
			pipe.passed = true;
			score++;
			scoreTxt.setText(score);
			LK.getSound('score').play();
		}
	}
	// Collision detection (pipes)
	for (var i = 0; i < pipes.length; i++) {
		var rects = pipes[i].getRects();
		for (var j = 0; j < rects.length; j++) {
			var r = rects[j];
			// Circle-rectangle collision
			var cx = bird.x;
			var cy = bird.y;
			var rx = r.x;
			var ry = r.y;
			var rw = r.width;
			var rh = r.height;
			// Find closest point to circle within rectangle
			var closestX = cx;
			if (cx < rx) closestX = rx;else if (cx > rx + rw) closestX = rx + rw;
			var closestY = cy;
			if (cy < ry) closestY = ry;else if (cy > ry + rh) closestY = ry + rh;
			var dx = cx - closestX;
			var dy = cy - closestY;
			var distSq = dx * dx + dy * dy;
			if (distSq < bird.radius * bird.radius) {
				// Collision!
				isAlive = false;
				LK.effects.flashScreen(0xff0000, 800);
				LK.showGameOver();
				return;
			}
		}
	}
	// Collision with ground
	if (bird.y + bird.radius > groundY) {
		isAlive = false;
		LK.effects.flashScreen(0xff0000, 800);
		LK.showGameOver();
		return;
	}
	// Collision with ceiling
	if (bird.y - bird.radius < 0) {
		bird.y = bird.radius;
		bird.velocityY = 0;
	}
};
// Reset game state on game over (handled by LK, but for safety)
game.on('destroy', function () {
	pipes = [];
	isAlive = false;
	started = false;
	score = 0;
});
/**** 
* Asset Initialization (for static analysis)
****/ 
// Bird asset (yellow ellipse)
// Pipe asset (green box)
// Ground asset (brown box)

===================================================================
--- original.js
+++ change.js
@@ -42,9 +42,9 @@
 var PipePair = Container.expand(function () {
 	var self = Container.call(this);
 	// Pipe properties
 	self.pipeWidth = 220;
-	self.gapHeight = 520;
+	self.gapHeight = 720;
 	self.speed = 12; // Speed at which pipes move left
 	// Randomize gap position
 	var minGapY = 400;
 	var maxGapY = 2732 - 400 - self.gapHeight;