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

/**** 
* Classes
****/ 
// The main block the player controls
var JumpBlock = Container.expand(function () {
	var self = Container.call(this);
	// Attach the block asset (a box)
	var block = self.attachAsset('jumpBlock', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Block state
	self.isJumping = false;
	self.jumpHeight = 500; // How high the block jumps (in px)
	self.jumpDuration = 350; // ms for jump up
	self.fallDuration = 400; // ms for fall down
	// Store ground Y for reset
	self.groundY = 0;
	// Method to trigger jump
	self.jump = function (_onFinish) {
		if (self.isJumping) return;
		self.isJumping = true;
		// Animate up
		tween(self, {
			y: self.y - self.jumpHeight
		}, {
			duration: self.jumpDuration,
			easing: tween.cubicOut,
			onFinish: function onFinish() {
				// Animate down
				tween(self, {
					y: self.groundY
				}, {
					duration: self.fallDuration,
					easing: tween.bounceOut,
					onUpdate: function onUpdate() {
						// Check for landing on top of a spike during the fall
						if (typeof spikes !== "undefined" && Array.isArray(spikes)) {
							for (var i = 0; i < spikes.length; i++) {
								var s = spikes[i];
								// Only check if block is falling and above the spike
								// Check if block's bottom is just above spike's top and horizontally overlapping
								var blockBottom = self.y + self.height / 2;
								var spikeTop = s.y - s.height / 2;
								var blockLastBottom = self.lastY !== undefined ? self.lastY + self.height / 2 : blockBottom;
								// Check if we just crossed the spike top from above
								if (blockLastBottom <= spikeTop && blockBottom > spikeTop && Math.abs(self.x - s.x) < (self.width / 2 + s.width / 2) * 0.7 // allow some tolerance
								) {
									// Die if landed on spike
									LK.effects.flashScreen(0xff0000, 800);
									LK.showGameOver();
									return;
								}
							}
						}
						// Track lastY for next update
						self.lastY = self.y;
					},
					onFinish: function onFinish() {
						self.isJumping = false;
						if (_onFinish) _onFinish();
					}
				});
			}
		});
	};
	return self;
});
// The jump arrow button
var JumpButton = Container.expand(function () {
	var self = Container.call(this);
	// Attach a large ellipse as the button
	var btn = self.attachAsset('jumpArrowBtn', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Attach an up arrow (triangle)
	var arrow = self.attachAsset('jumpArrow', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	arrow.width = btn.width * 0.32;
	arrow.height = btn.height * 0.32;
	arrow.rotation = 0; // Upwards
	arrow.y = 0;
	// Visual feedback on press
	self.flash = function () {
		tween(btn, {
			scaleX: 0.92,
			scaleY: 0.92
		}, {
			duration: 60,
			easing: tween.easeIn,
			onFinish: function onFinish() {
				tween(btn, {
					scaleX: 1,
					scaleY: 1
				}, {
					duration: 80,
					easing: tween.easeOut
				});
			}
		});
	};
	return self;
});
// Spikes that move from right to left
var Spike = Container.expand(function () {
	var self = Container.call(this);
	// Attach a triangle-like spike using the jumpArrow asset, rotated down
	var spike = self.attachAsset('jumpArrow', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	spike.width = 120;
	spike.height = 120;
	spike.rotation = Math.PI; // Pointing down
	// Track lastX for event triggers
	self.lastX = 0;
	// Set up spike position and speed
	self.speed = 12; // px per frame, will be set by game
	self.update = function () {
		self.lastX = self.x;
		self.x -= self.speed;
		// Remove if off screen
		if (self.x < -spike.width) {
			if (self.parent) self.parent.removeChild(self);
			self.destroyed = true;
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x222a36
});

/**** 
* Game Code
****/ 
// Play GeometryDashSound when the game starts
LK.getSound('GeometryDashSound').play();
// Old man image for YOU WIN popup
// Score text
// Create block asset (box)
// Create jump button asset (ellipse)
// Create arrow asset (box, will be rotated)
var scoreTxt = new Text2('0', {
	size: 140,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Center block horizontally, place at bottom with margin
var block = new JumpBlock();
game.addChild(block);
block.x = 2048 / 2;
block.groundY = 2732 - 220;
block.y = block.groundY;
// Place jump button above bottom, right side
var jumpBtn = new JumpButton();
game.addChild(jumpBtn);
// Position jump button on the right side, with a margin from the edge and a bit lower above the bottom
jumpBtn.x = 2048 - 320; // 320px margin from right edge, fits button width
jumpBtn.y = 2732 - 280; // moved further down (closer to bottom)
// Score
var score = 0;
LK.setScore(0);
// Touch/click handling for jump button
var isBtnPressed = false;
// Helper: check if point (x, y) is inside jumpBtn
function isInsideJumpBtn(x, y) {
	// Use ellipse hit test
	var dx = x - jumpBtn.x;
	var dy = y - jumpBtn.y;
	var rx = jumpBtn.width / 2;
	var ry = jumpBtn.height / 2;
	return dx * dx / (rx * rx) + dy * dy / (ry * ry) <= 1;
}
// Main move handler
function handleMove(x, y, obj) {
	// No drag needed, just visual feedback if finger is on button
	if (isBtnPressed) {
		if (!isInsideJumpBtn(x, y)) {
			isBtnPressed = false;
		}
	}
}
// Down event: check if jumpBtn is pressed
game.down = function (x, y, obj) {
	if (isInsideJumpBtn(x, y) && !block.isJumping) {
		isBtnPressed = true;
		jumpBtn.flash();
		block.jump(function () {
			// On landing, increment score
			score += 1;
			LK.setScore(score);
			scoreTxt.setText(score);
			// Show YOU WIN if score reaches 20
			if (score === 20) {
				LK.showYouWin();
				// Show old man image in the center of the screen
				var oldManImg = LK.getAsset('oldMan', {
					anchorX: 0.5,
					anchorY: 0.5,
					x: 2048 / 2,
					y: 2732 / 2
				});
				LK.gui.center.addChild(oldManImg);
				// Remove the image after 2.5 seconds (YOU WIN popup will also reset game)
				LK.setTimeout(function () {
					if (oldManImg.parent) oldManImg.parent.removeChild(oldManImg);
				}, 2500);
			}
		});
	}
};
// Up event: reset press state
game.up = function (x, y, obj) {
	isBtnPressed = false;
};
// Move event: for touch feedback
game.move = handleMove;
// Spikes array
var spikes = [];
// How many frames between spikes
var spikeInterval = 90;
var spikeTimer = 0;
// How fast the world moves (spikes and block)
var worldSpeed = 12;
// Game update: move spikes, spawn new, move block left, check collisions
game.update = function () {
	// Move all spikes and remove destroyed ones
	for (var i = spikes.length - 1; i >= 0; i--) {
		var s = spikes[i];
		s.update();
		// Collision: only if block is on ground (not jumping)
		if (!block.isJumping && block.intersects(s)) {
			// Flash screen and game over
			LK.effects.flashScreen(0xff0000, 800);
			LK.showGameOver();
			return;
		}
		if (s.destroyed) {
			spikes.splice(i, 1);
		}
	}
	// Move block left to simulate screen movement (but clamp to min X)
	block.x -= worldSpeed;
	if (block.x < 400) block.x = 400;
	// (Do not move jump button with the world)
	// Spawn new spikes
	spikeTimer++;
	if (spikeTimer >= spikeInterval) {
		spikeTimer = 0;
		var newSpike = new Spike();
		// Place spike at right edge, on ground
		newSpike.x = 2048 + 60;
		newSpike.y = block.groundY + 90; // Place spike base at ground
		newSpike.speed = worldSpeed;
		spikes.push(newSpike);
		game.addChild(newSpike);
	}
};
// Reset score to 0 when the game is destroyed (exited)
game.destroy = function () {
	score = 0;
	LK.setScore(0);
	// Reset spikes and world position
	for (var i = 0; i < spikes.length; i++) {
		if (spikes[i].parent) spikes[i].parent.removeChild(spikes[i]);
	}
	spikes = [];
	block.x = 2048 / 2;
	// (Do not reset jump button X, as it never moves)
};
// Reset score to 0 when the game is paused
game.pause = function () {
	score = 0;
	LK.setScore(0);
	// Reset spikes and world position
	for (var i = 0; i < spikes.length; i++) {
		if (spikes[i].parent) spikes[i].parent.removeChild(spikes[i]);
	}
	spikes = [];
	block.x = 2048 / 2;
	// (Do not reset jump button X, as it never moves)
};

===================================================================
--- original.js
+++ change.js
@@ -145,8 +145,10 @@
 
 /**** 
 * Game Code
 ****/ 
+// Play GeometryDashSound when the game starts
+LK.getSound('GeometryDashSound').play();
 // Old man image for YOU WIN popup
 // Score text
 // Create block asset (box)
 // Create jump button asset (ellipse)