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

/**** 
* Classes
****/ 
// Branch asset
// Bird1 class to represent the first kind of bird
var Bird1 = Container.expand(function () {
	var self = Container.call(this);
	var birdGraphics = self.attachAsset('bird1', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = Math.random() * 1.6 + 1;
	self.lastY = self.y; // Initialize lastY for tracking changes on Y
	self.update = function () {
		self.y += self.speed;
		self.x += Math.sin(self.y / 100) * 6.5; // Increase the swooping motion of the bird's movement by 30%
		// Check if the bird has moved off-screen
		if (self.lastY <= 2732 && self.y > 2732) {
			self.y = -self.height;
			self.x = Math.random() < 0.33 ? Math.random() * 2048 : Math.random() < 0.5 ? 0 : 2048;
		}
		self.lastY = self.y; // Update lastY after movement
	};
});
// Bird2 class to represent the second kind of bird
var Bird2 = Container.expand(function () {
	var self = Container.call(this);
	var birdGraphics = self.attachAsset('bird2b', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = Math.random() * 1.6 + 1;
	self.lastY = self.y; // Initialize lastY for tracking changes on Y
	self.update = function () {
		self.y += self.speed;
		self.x += Math.sin(self.y / 100) * 6.5; // Increase the swooping motion of the bird's movement by 30%
		// Check if the bird has moved off-screen
		if (self.lastY <= 2732 && self.y > 2732) {
			self.y = Math.random() * 2732; // Random initial y position within the screen height
			self.x = Math.random() < 0.5 ? 0 : 2048; // Start from either the left or right side
		}
		self.lastY = self.y; // Update lastY after movement
	};
});
// Bird3 class to represent a third kind of bird
var Bird3 = Container.expand(function () {
	var self = Container.call(this);
	var birdGraphics = self.attachAsset('bird2', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = Math.random() * 1.6 + 1;
	self.lastY = self.y; // Initialize lastY for tracking changes on Y
	self.update = function () {
		self.y += self.speed;
		self.x += Math.sin(self.y / 100) * 6.5; // Increase the swooping motion of the bird's movement by 30%
		// Check if the bird has moved off-screen
		if (self.lastY <= 2732 && self.y > 2732) {
			self.y = -self.height;
			self.x = Math.random() < 0.33 ? Math.random() * 2048 : Math.random() < 0.5 ? 0 : 2048;
		}
		self.lastY = self.y; // Update lastY after movement
	};
});
// Cloud class to represent clouds moving across the screen
var Cloud = Container.expand(function () {
	var self = Container.call(this);
	var cloudGraphics = self.attachAsset('cloud', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = (Math.random() * 0.5 + 0.5) * 0.4; // Reduce speed by 60% (20% slower than before)
	self.hasAccelerated = false; // Track if the cloud has already accelerated
	self.direction = Math.random() < 0.5 ? 1 : -1; // Random direction: 1 for right, -1 for left
	self.lastX = self.x; // Track last X position for future checks
	self.lastIntersecting = false; // Initialize lastIntersecting for tracking changes on intersections
	self.update = function () {
		self.x += self.speed * self.direction;
		// If the cloud moves off-screen, reposition it to the opposite side
		if (self.lastX <= 2048 + self.width / 2 && self.x > 2048 + self.width / 2) {
			self.x = -self.width / 2;
		} else if (self.lastX >= -self.width / 2 && self.x < -self.width / 2) {
			self.x = 2048 + self.width / 2;
		}
		// Check for overlap with other clouds
		for (var i = 0; i < clouds.length; i++) {
			if (clouds[i] !== self && self.intersects(clouds[i])) {
				if (!self.hasAccelerated) {
					var slowestSpeed = Math.min(self.speed, clouds[i].speed);
					self.speed += slowestSpeed * 0.1; // Increase speed by 10% of the slowest cloud's speed
					self.hasAccelerated = true; // Mark as accelerated
				}
				break;
			}
		}
		// Check if the cloud intersects with the sun
		if (!self.lastIntersecting && self.intersects(sun)) {
			self.speed *= 1.5; // Increase speed by 50%
			tween(cloudGraphics, {
				alpha: 0.5
			}, {
				duration: 3000,
				easing: tween.linear
			});
		} else if (self.lastIntersecting && !self.intersects(sun)) {
			self.speed /= 1.5; // Reset speed to original
			tween(cloudGraphics, {
				alpha: 1.0
			}, {
				duration: 3000,
				easing: tween.linear
			});
		}
		self.lastIntersecting = self.intersects(sun);
		self.lastX = self.x; // Update lastX after movement
	};
});
// Grass class to represent the grass image
var Grass = Container.expand(function () {
	var self = Container.call(this);
	self.attachAsset('grass', {
		anchorX: 0.5,
		anchorY: 1
	});
});
// Sun class to represent a pulsating sun in the top right corner
var Sun = Container.expand(function () {
	var self = Container.call(this);
	var sunGraphics = self.attachAsset('sun', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.x = sunGraphics.width / 2;
	self.y = sunGraphics.height / 2;
	// Function to create a pulsating effect
	function pulsate() {
		tween(self, {
			scaleX: 1.1,
			scaleY: 1.1
		}, {
			duration: 1000,
			easing: tween.easeInOut,
			onFinish: function onFinish() {
				tween(self, {
					scaleX: 1.0,
					scaleY: 1.0
				}, {
					duration: 1000,
					easing: tween.easeInOut,
					onFinish: pulsate
				});
			}
		});
	}
	pulsate(); // Start the pulsating effect
});
// Tree class to represent a tree with a 9:16 aspect ratio
var Tree = Container.expand(function () {
	var self = Container.call(this);
	var treeGraphics = self.attachAsset('tree', {
		anchorX: 0.5,
		anchorY: 1
	});
	self.update = function () {
		// Add any specific update logic for the tree here
	};
});
// UFO class to represent a UFO flying across the screen
var UFO = Container.expand(function () {
	var self = Container.call(this);
	var ufoGraphics = self.attachAsset('ufo', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 3.2; // Decrease speed by 20%
	self.direction = Math.random() < 0.5 ? 1 : -1; // Random direction: 1 for right, -1 for left
	self.lastX = self.x; // Track last X position for future checks
	self.update = function () {
		self.x += self.speed * self.direction;
		self.y = 100 + Math.sin(self.x / 70) * 165; // Increase the wave pattern depth by 10%
		// If the UFO moves off-screen, destroy it and set to null
		if (self.lastX <= 2048 + self.width / 2 && self.x > 2048 + self.width / 2 || self.lastX >= -self.width / 2 && self.x < -self.width / 2) {
			self.destroy();
			ufo = null;
		}
		self.lastX = self.x; // Update lastX after movement
	};
});

/**** 
* Initialize Game
****/ 
/**** 
* Assets
LK.init.shape('branch', {width:50, height:10, color:0x8b4513, shape:'box'})
****/ 
// Initialize clouds array
var game = new LK.Game({
	backgroundColor: 0x87CEEB // Light blue background to simulate the sky
});

/**** 
* Game Code
****/ 
// Function to spawn a smart bird
var VOLUME_BGM1 = 0.02;
var VOLUME_BREEZE1 = 3;
var VOLUME_CRICKET1 = 3;
var VOLUME_FROG1 = 3;
var VOLUME_SONGBIRD1 = 3;
var VOLUME_UFO1 = 3;
var VOLUME_WINGS1 = 3;
function spawnSmartBird() {
	// Randomly choose a bird type
	var birdType;
	do {
		birdType = Math.floor(Math.random() * 3) + 1;
	} while (birdType === lastBirdType);
	lastBirdType = birdType;
	var bird;
	// Create a bird based on the chosen type
	if (birdType === 1) {
		bird = new Bird1();
	} else if (birdType === 2) {
		bird = new Bird2();
	} else {
		bird = new Bird3();
	}
	// Set initial position and speed
	bird.x = Math.random() * 2048;
	bird.y = -bird.height;
	bird.speed = 1 + Math.random() * 0.6;
	bird.lastIntersecting = false;
	// Add the bird to the game and the birds array
	LK.setTimeout(function () {
		game.addChild(bird);
		birds.push(bird);
	}, 2000);
}
game.move = function (x, y, obj) {
	// Reset the auto-targeting timer when the mouse moves
	if (autoTargetingTimer) {
		LK.clearTimeout(autoTargetingTimer);
	}
	if (!game.reticle) {
		game.reticle = LK.getAsset('reticle1', {
			anchorX: 0.5,
			anchorY: 0.5
		});
		game.addChild(game.reticle);
	}
	game.reticle.x = x;
	game.reticle.y = y;
	// Start a new timer for auto-targeting
	autoTargetingTimer = LK.setTimeout(startAutoTargeting, 5000);
};
// Function to start auto-targeting birds
function startAutoTargeting() {
	autoTargetingActive = true;
}
// Function to update reticle position for auto-targeting
function updateAutoTargeting() {
	if (autoTargetingActive) {
		// Find the closest bird to target
		var closestBird = null;
		var minDistance = Infinity;
		birds.forEach(function (bird) {
			var distance = Math.sqrt(Math.pow(bird.x - game.reticle.x, 2) + Math.pow(bird.y - game.reticle.y, 2));
			if (distance < minDistance) {
				minDistance = distance;
				closestBird = bird;
			}
		});
		// Move reticle towards the closest bird
		if (closestBird) {
			game.reticle.x += (closestBird.x - game.reticle.x) * 0.1;
			game.reticle.y += (closestBird.y - game.reticle.y) * 0.1;
		}
	}
}
var lastBirdType = null; // Track the last spawned bird type
var autoTargetingTimer = null;
var autoTargetingActive = true;
// Update function to handle auto-targeting
game.update = function () {
	updateAutoTargeting();
	// Existing update logic...
};
// Add a sun to the game in the top left corner
var sun = game.addChild(new Sun());
sun.x = 1750;
sun.y = 280;
// Function to add a UFO to the game
function addUFO() {
	var ufo = game.addChild(new UFO());
	ufo.x = Math.random() < 0.5 ? 2048 + ufo.width / 2 : -ufo.width / 2; // Start from either the far right or left edge of the screen
	ufo.y = Math.random() * 500; // Random initial y position in the upper part of the screen
	ufo.customUpdate = function () {
		ufo.update();
	};
	LK.getSound('ufo1').play({
		loop: true // Ensure the sound loops while the UFO is on screen
	});
	return ufo;
}
// Initialize clouds array
var clouds = [];
for (var i = 0; i < 4; i++) {
	// Add 3 clouds for variety
	var cloud = new Cloud();
	cloud.x = Math.random() * 2048;
	cloud.y = Math.random() * 500; // Position clouds in the upper part of the screen
	clouds.push(cloud);
	game.addChild(cloud);
}
// Initialize a timer to add a UFO at a random time between 30 and 50 seconds
var ufo; // Define the ufo variable in the global scope
var ufoTimer = LK.setTimeout(function () {
	addUFO();
	// Reset the timer with a new random time
	ufoTimer = LK.setTimeout(arguments.callee, Math.random() * 20000 + 30000);
}, Math.random() * 20000 + 30000);
game.update = function () {
	for (var i = 0; i < clouds.length; i++) {
		clouds[i].update();
	}
	if (ufo) {
		ufo.customUpdate();
		// Check if the UFO has moved off-screen
		if (ufo.lastX <= 2048 + ufo.width / 2 && ufo.x > 2048 + ufo.width / 2 || ufo.lastX >= -ufo.width / 2 && ufo.x < -ufo.width / 2) {
			// Destroy the UFO and set it to null
			ufo.destroy();
			ufo = null;
			// Stop the ufo1 sound
			LK.getSound('ufo1').stop();
			// Start a timer for the UFO to reappear between 30-50 seconds
			ufoTimer = LK.setTimeout(function () {
				ufo = addUFO();
			}, Math.random() * 20000 + 30000);
		} else {
			// Ensure the ufo1 sound is playing while the UFO is on screen
			if (!LK.getSound('ufo1').isPlaying() && ufo) {
				LK.getSound('ufo1').play({
					loop: true
				});
			}
		}
		ufo.lastX = ufo.x; // Update lastX for the UFO
	}
	// Handle collision and bouncing between all birds
	birds.forEach(function (birdA, indexA) {
		birds.forEach(function (birdB, indexB) {
			if (indexA !== indexB && !birdA.lastIntersecting && birdA.intersects(birdB)) {
				var dx = birdB.x - birdA.x;
				var dy = birdB.y - birdA.y;
				var distance = Math.sqrt(dx * dx + dy * dy);
				var minDist = (birdA.width + 10) / 2 + (birdB.width + 10) / 2;
				if (distance < minDist) {
					var angle = Math.atan2(dy, dx);
					var targetX = birdA.x + Math.cos(angle) * minDist;
					var targetY = birdA.y + Math.sin(angle) * minDist;
					var ax = (targetX - birdB.x) * 0.02;
					var ay = (targetY - birdB.y) * 0.02;
					birdA.x -= ax;
					birdA.y -= ay;
					birdB.x += ax;
					birdB.y += ay;
				}
				birdA.lastIntersecting = true;
				birdB.lastIntersecting = true;
			} else {
				birdA.lastIntersecting = false;
				birdB.lastIntersecting = false;
			}
		});
	});
};
// Create an array to hold bird objects
var birds = [];
// bird1
// Function to add a bird to the game
function addBird(type) {
	var bird;
	if (type === 1) {
		bird = new Bird1();
	} else if (type === 2) {
		bird = new Bird2();
	} else {
		bird = new Bird3();
	}
	bird.x = Math.random() * 2048;
	bird.y = -bird.height;
	bird.speed = 1 + Math.random() * 0.6;
	bird.lastIntersecting = false;
	game.addChild(bird);
	birds.push(bird);
}
// Initialize with 3 birds
addBird(1);
// Ensure there are always at least 3 birds on screen
game.update = function () {
	// Existing update logic...
	// Check the number of birds on screen
	if (birds.length < 3) {
		addBird(Math.floor(Math.random() * 3) + 1);
	}
	// Update each bird
	birds.forEach(function (bird) {
		bird.update();
	});
};
// Add a tree to the game
var tree = game.addChild(new Tree());
tree.x = 2048 / 2; // Center the tree to prevent it from being cut off on the right side
tree.y = 2732 - 50; // Position the tree on the grass
// No need to create branches here as they are created in the Tree class
var score = 0;
var scoreImage = LK.getAsset('scoreImage', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 20,
	// Move left by 80px
	y: 1750 // Move down by 80px
});
LK.gui.top.addChild(scoreImage);
var scoreTxt = new Text2('0', {
	x: 200,
	y: 200,
	size: 100,
	fill: 0x00FF00,
	// Monochrome green color
	font: "Courier New",
	// Monospace font for score text
	stroke: 0x000000,
	// Outline with a thin black line 
	strokeThickness: 5,
	// Thickness of the outline
	dropShadow: true,
	// Enable drop shadow
	dropShadowColor: 0x000000,
	// Black shadow
	dropShadowBlur: 5,
	// Blur level of the shadow
	dropShadowAngle: Math.PI / 6,
	// Angle of the shadow
	dropShadowDistance: 6 // Distance of the shadow
});
// Add the cat to the game
// Add the grass floor to the game
var grass = new Grass();
grass.x = 1020;
grass.y = 2735; // Position grass at the bottom
game.addChild(grass);
scoreTxt.x = 2048 / 2; // Center the score text horizontally
scoreTxt.y = 2732 / 2; // Center the score text vertically
LK.gui.top.addChild(scoreTxt);
// Function to handle bgm1 end event
function onBgm1End() {
	// Set a timer to replay bgm1 after 50-80 seconds
	var bgmTimer = LK.setTimeout(function () {
		LK.playMusic('bgm1', {
			loop: true,
			fade: {
				start: 0,
				end: 1,
				duration: 4000
			},
			onEnd: onBgm1End
		});
	}, Math.random() * 30000 + 50000);
}
;
var cat = game.addChild(LK.getAsset('cat', {
	anchorX: 0.5,
	anchorY: 1,
	x: 2048 - 200,
	// Position the cat to the far right
	y: 2732 // Position the cat at the bottom of the screen
}));
// Play bgm1 once on load and set a timer to replay it every 20-50 seconds
LK.playMusic('bgm1', {
	loop: false,
	// Play once
	fade: {
		start: 0,
		end: 0.02,
		// Set to the lowest volume
		duration: 4000
	},
	onEnd: function onEnd() {
		// Set a timer to replay bgm1 every 20-50 seconds
		LK.setTimeout(function () {
			LK.playMusic('bgm1', {
				loop: false,
				// Play once
				fade: {
					start: 0,
					end: 0.02,
					// Set to the lowest volume
					duration: 4000
				},
				onEnd: onEnd // Set the onEnd function to replay bgm1
			});
		}, Math.random() * 30000 + 20000); // Random time between 20-50 seconds
	}
});
// Initialize a timer to play the wings1 sound at a random time between 10 and 30 seconds
var wingsTimer = LK.setTimeout(function () {
	LK.getSound('wings1').play();
	wingsTimer = LK.setTimeout(arguments.callee, Math.random() * 20000 + 10000);
}, Math.random() * 20000 + 10000);
// Create an array for all sounds except ufo1, including all birdsong sounds
var sounds = ['cricket1', 'frog1', 'wings1', 'songbird1'];
// Initialize random timers for each sound to play between 30-50 seconds
sounds.forEach(function (soundId) {
	var sound = LK.getSound(soundId);
	var ambientSoundTimer = LK.setTimeout(function () {
		sound.play();
		// Reset the timer to play the sound again between 30-50 seconds
		ambientSoundTimer = LK.setTimeout(arguments.callee, Math.random() * 20000 + 30000);
	}, Math.random() * 20000 + 30000);
});

===================================================================
--- original.js
+++ change.js
@@ -14,23 +14,18 @@
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
 	self.speed = Math.random() * 1.6 + 1;
+	self.lastY = self.y; // Initialize lastY for tracking changes on Y
 	self.update = function () {
-		if (self.lastY === undefined) {
-			self.lastY = self.y;
-		} // Initialize lastY for tracking changes on Y
 		self.y += self.speed;
-		self.lastY = self.y; // Update lastY after movement
 		self.x += Math.sin(self.y / 100) * 6.5; // Increase the swooping motion of the bird's movement by 30%
-		if (self.y > 2732) {
+		// Check if the bird has moved off-screen
+		if (self.lastY <= 2732 && self.y > 2732) {
 			self.y = -self.height;
-			if (Math.random() < 0.33) {
-				self.x = Math.random() * 2048; // Start from a random position along the top
-			} else {
-				self.x = Math.random() < 0.5 ? 0 : 2048; // Start from either the left or right side
-			}
+			self.x = Math.random() < 0.33 ? Math.random() * 2048 : Math.random() < 0.5 ? 0 : 2048;
 		}
+		self.lastY = self.y; // Update lastY after movement
 	};
 });
 // Bird2 class to represent the second kind of bird
 var Bird2 = Container.expand(function () {
@@ -39,19 +34,18 @@
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
 	self.speed = Math.random() * 1.6 + 1;
+	self.lastY = self.y; // Initialize lastY for tracking changes on Y
 	self.update = function () {
-		if (self.lastY === undefined) {
-			self.lastY = self.y;
-		} // Initialize lastY for tracking changes on Y
 		self.y += self.speed;
-		self.lastY = self.y; // Update lastY after movement
 		self.x += Math.sin(self.y / 100) * 6.5; // Increase the swooping motion of the bird's movement by 30%
-		if (self.y > 2732) {
+		// Check if the bird has moved off-screen
+		if (self.lastY <= 2732 && self.y > 2732) {
 			self.y = Math.random() * 2732; // Random initial y position within the screen height
 			self.x = Math.random() < 0.5 ? 0 : 2048; // Start from either the left or right side
 		}
+		self.lastY = self.y; // Update lastY after movement
 	};
 });
 // Bird3 class to represent a third kind of bird
 var Bird3 = Container.expand(function () {
@@ -60,23 +54,18 @@
 		anchorX: 0.5,
 		anchorY: 0.5
 	});
 	self.speed = Math.random() * 1.6 + 1;
+	self.lastY = self.y; // Initialize lastY for tracking changes on Y
 	self.update = function () {
-		if (self.lastY === undefined) {
-			self.lastY = self.y;
-		} // Initialize lastY for tracking changes on Y
 		self.y += self.speed;
-		self.lastY = self.y; // Update lastY after movement
 		self.x += Math.sin(self.y / 100) * 6.5; // Increase the swooping motion of the bird's movement by 30%
-		if (self.y > 2732) {
+		// Check if the bird has moved off-screen
+		if (self.lastY <= 2732 && self.y > 2732) {
 			self.y = -self.height;
-			if (Math.random() < 0.33) {
-				self.x = Math.random() * 2048; // Start from a random position along the top
-			} else {
-				self.x = Math.random() < 0.5 ? 0 : 2048; // Start from either the left or right side
-			}
+			self.x = Math.random() < 0.33 ? Math.random() * 2048 : Math.random() < 0.5 ? 0 : 2048;
 		}
+		self.lastY = self.y; // Update lastY after movement
 	};
 });
 // Cloud class to represent clouds moving across the screen
 var Cloud = Container.expand(function () {
@@ -87,17 +76,18 @@
 	});
 	self.speed = (Math.random() * 0.5 + 0.5) * 0.4; // Reduce speed by 60% (20% slower than before)
 	self.hasAccelerated = false; // Track if the cloud has already accelerated
 	self.direction = Math.random() < 0.5 ? 1 : -1; // Random direction: 1 for right, -1 for left
+	self.lastX = self.x; // Track last X position for future checks
+	self.lastIntersecting = false; // Initialize lastIntersecting for tracking changes on intersections
 	self.update = function () {
 		self.x += self.speed * self.direction;
 		// If the cloud moves off-screen, reposition it to the opposite side
-		if (self.x > 2048 + self.width / 2) {
+		if (self.lastX <= 2048 + self.width / 2 && self.x > 2048 + self.width / 2) {
 			self.x = -self.width / 2;
-		} else if (self.x < -self.width / 2) {
+		} else if (self.lastX >= -self.width / 2 && self.x < -self.width / 2) {
 			self.x = 2048 + self.width / 2;
 		}
-		self.lastX = self.x; // Track last X position for future checks
 		// Check for overlap with other clouds
 		for (var i = 0; i < clouds.length; i++) {
 			if (clouds[i] !== self && self.intersects(clouds[i])) {
 				if (!self.hasAccelerated) {
@@ -126,8 +116,9 @@
 				easing: tween.linear
 			});
 		}
 		self.lastIntersecting = self.intersects(sun);
+		self.lastX = self.x; // Update lastX after movement
 	};
 });
 // Grass class to represent the grass image
 var Grass = Container.expand(function () {
@@ -187,16 +178,18 @@
 		anchorY: 0.5
 	});
 	self.speed = 3.2; // Decrease speed by 20%
 	self.direction = Math.random() < 0.5 ? 1 : -1; // Random direction: 1 for right, -1 for left
+	self.lastX = self.x; // Track last X position for future checks
 	self.update = function () {
 		self.x += self.speed * self.direction;
 		self.y = 100 + Math.sin(self.x / 70) * 165; // Increase the wave pattern depth by 10%
 		// If the UFO moves off-screen, destroy it and set to null
-		if (self.x > 2048 + self.width / 2 || self.x < -self.width / 2) {
+		if (self.lastX <= 2048 + self.width / 2 && self.x > 2048 + self.width / 2 || self.lastX >= -self.width / 2 && self.x < -self.width / 2) {
 			self.destroy();
 			ufo = null;
 		}
+		self.lastX = self.x; // Update lastX after movement
 	};
 });
 
 /****