/**** 
* Classes
****/ 
// Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('enemy_dino', {
		anchorX: 0.5,
		anchorY: 1,
		scaleX: 2,
		scaleY: 2
	});
	self.vx = -2;
	self.lastX = 0;
	self.lastY = 0;
	self.update = function () {
		self.lastX = self.x;
		self.lastY = self.y;
		// Simple left-right movement
		self.x += self.vx;
	};
	return self;
});
// LevelGate class
var LevelGate = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('level_gate', {
		anchorX: 0.5,
		anchorY: 1
	});
	self.active = false;
	return self;
});
// Initialize player
// Meteor class
var Meteor = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('meteor', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.vy = 8;
	self.lastY = 0;
	self.update = function () {
		self.lastY = self.y;
		self.y += self.vy;
	};
	return self;
});
// Mushroom class
var Mushroom = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('mushroom', {
		anchorX: 0.5,
		anchorY: 1
	});
	self.collected = false;
	return self;
});
// Platform class
var Platform = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('platform', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	return self;
});
// Player class
var Player = Container.expand(function () {
	var self = Container.call(this);
	var gfx = self.attachAsset('dino_player', {
		anchorX: 0.5,
		anchorY: 1,
		scaleX: 2,
		scaleY: 2
	});
	self.vx = 0;
	self.vy = 0;
	self.isJumping = false;
	self.lastX = 0;
	self.lastY = 0;
	self.update = function () {
		self.lastX = self.x;
		self.lastY = self.y;
		// Rotate player to face direction of movement
		if (self.vx > 0) {
			// Face right
			if (gfx.scaleX < 0) {
				gfx.scaleX = Math.abs(gfx.scaleX);
			}
		} else if (self.vx < 0) {
			// Face left (flip horizontally)
			if (gfx.scaleX > 0) {
				gfx.scaleX = -Math.abs(gfx.scaleX);
			}
		}
		// Movement and gravity will be handled in game.update
		// Player position is updated in game.update, so nothing to do here
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
// Play background music at game start
LK.playMusic('musicId');
// Global game objects and state
var player = null;
var platforms = [];
var mushrooms = [];
var enemies = [];
var meteors = [];
var levelGate = null;
var score = 0;
var mushroomsToNextLevel = 10;
var canLevelUp = false;
// Initialize player
player = new Player();
player.x = 300;
player.y = 2200;
// Create a seamless row of platforms spanning the screen horizontally
var platformAsset = LK.getAsset('platform', {
	anchorX: 0.5,
	anchorY: 0.5
});
var platformWidth = platformAsset.width;
var yBase = 2300;
for (var px = 0; px < 2048; px += platformWidth) {
	var plat = new Platform();
	plat.x = px + platformWidth / 2;
	plat.y = yBase;
	game.addChild(plat);
	platforms.push(plat);
}
// Add player after platforms so player is in front of platforms
game.addChild(player);
// Example mushrooms
for (var i = 0; i < mushroomsToNextLevel; i++) {
	var mush = new Mushroom();
	mush.x = 400 + i * 150;
	mush.y = 2200 - i % 3 * 200;
	game.addChild(mush);
	mushrooms.push(mush);
}
// Example enemy
var enemy1 = new Enemy();
enemy1.x = 1200;
enemy1.y = 2300;
// Add enemy after player so enemy is in front of player
game.addChild(enemy1);
enemies.push(enemy1);
// Example meteor (will be dropped randomly in game.update)
// Touch controls
var jumpQueued = false;
var isTouching = false;
var swipeStartY = null;
var swipeActive = false;
var swipeDetected = false;
var swipeThreshold = 80;
// Track both horizontal touch and swipe for jump independently
game.down = function (x, y, obj) {
	isTouching = true;
	game.lastTouchX = x;
	swipeStartY = y;
	swipeActive = true;
	swipeDetected = false;
	// Determine intended direction based on touch position relative to player
	if (player && typeof player.x === "number") {
		if (x > player.x) {
			game.touchDirection = 1; // right
		} else if (x < player.x) {
			game.touchDirection = -1; // left
		} else {
			game.touchDirection = 0;
		}
	} else {
		game.touchDirection = 0;
	}
};
game.move = function (x, y, obj) {
	// Detect upward swipe for jump, but allow horizontal movement at the same time
	// Only allow one jump per upward swipe gesture
	if (swipeActive && typeof swipeStartY === "number" && swipeStartY - y > swipeThreshold && !swipeDetected && player.jumpCount < 0.5) {
		jumpQueued = true;
		swipeDetected = true;
		// Reduce jump power by half for swipe jump
		player._swipeJump = true;
	}
	// Always update lastTouchX for horizontal movement
	if (isTouching) {
		game.lastTouchX = x;
		// Move player in the direction of swipe
		if (x > player.x + 10) {
			game.touchDirection = 1; // right
		} else if (x < player.x - 10) {
			game.touchDirection = -1; // left
		} else {
			game.touchDirection = 0;
		}
	}
};
game.up = function (x, y, obj) {
	isTouching = false;
	game.lastTouchX = undefined;
	swipeActive = false;
	swipeStartY = null;
	swipeDetected = false;
};
game.update = function () {
	// Player movement
	var speed = 16;
	var gravity = 7.5; // Softer gravity for more natural jump arc
	var jumpPower = -90; // Jump power
	var maxFallSpeed = 60; // Terminal velocity
	// Horizontal movement: move right if swipe started to the right of player, left if to the left
	// Allow jump and horizontal movement to be triggered simultaneously
	if (isTouching && typeof game.touchDirection === "number") {
		if (game.touchDirection === 1) {
			player.vx = speed;
		} else if (game.touchDirection === -1) {
			player.vx = -speed;
		} else {
			player.vx = 0;
		}
	} else {
		player.vx = 0;
	}
	player.x += player.vx;
	// Prevent player from moving outside the left and right screen boundaries
	var playerHalfWidth = player.width ? player.width / 2 : 50;
	if (player.x - playerHalfWidth < 0) {
		player.x = playerHalfWidth;
	}
	if (player.x + playerHalfWidth > 2048) {
		player.x = 2048 - playerHalfWidth;
	}
	// --- Clean, Natural Jump Physics ---
	// Track jump state
	if (typeof player.jumpCount === "undefined") {
		player.jumpCount = 0;
	}
	if (typeof player.isJumping === "undefined") {
		player.isJumping = false;
	}
	if (typeof player.wasOnGround === "undefined") {
		player.wasOnGround = false;
	}
	if (typeof player.wasOnPlatform === "undefined") {
		player.wasOnPlatform = false;
	}
	// Detect platform and ground contact (for landing)
	var onPlatform = false;
	var onGround = false;
	var platformY = null;
	for (var i = 0; i < platforms.length; i++) {
		var plat = platforms[i];
		// Check if player feet cross platform top (falling)
		var platTop = plat.y - plat.height / 2;
		var playerFeetLast = player.lastY + 10;
		var playerFeetNow = player.y + 10;
		if (playerFeetLast <= platTop && playerFeetNow >= platTop && player.x > plat.x - plat.width / 2 && player.x < plat.x + plat.width / 2 && player.vy >= 0) {
			onPlatform = true;
			platformY = platTop - 10;
			break;
		}
	}
	if (player.lastY < 2300 && player.y >= 2300) {
		onGround = true;
	}
	// Reset jump count and state if landed
	if ((onPlatform || onGround) && player.vy >= 0) {
		player.jumpCount = 0;
		player.isJumping = false;
	}
	// Allow jump if jumpQueued and jumpCount < 0.5 (half the previous max, disables double jump)
	if (jumpQueued && player.jumpCount < 0.5) {
		if (player._swipeJump) {
			player.vy = jumpPower / 2;
			player._swipeJump = false;
		} else {
			player.vy = jumpPower;
		}
		player.isJumping = true;
		player.jumpCount = 0.5; // Always set to 0.5, never allow more than 0.5 jumps
		jumpQueued = false;
	}
	// Variable jump height: if player releases touch while rising, cut jump short
	if (!isTouching && player.vy < 0) {
		player.vy += gravity * 1.2; // Slightly faster fall if jump released early
	}
	// Gravity: smooth, natural arc
	if (player.vy < 0) {
		// Rising: gentle gravity for floaty apex
		player.vy += gravity * 0.18;
	} else {
		// Falling: normal gravity
		player.vy += gravity;
	}
	if (player.vy > maxFallSpeed) {
		player.vy = maxFallSpeed;
	}
	// Apply vertical movement
	player.y += player.vy;
	// Snap to platform if landed
	if (onPlatform) {
		player.y = platformY;
		player.vy = 0;
		player.isJumping = false;
		player.jumpCount = 0;
	}
	// Snap to ground if landed
	if (player.y > 2300) {
		player.y = 2300;
		player.vy = 0;
		player.isJumping = false;
		player.jumpCount = 0;
	}
	// Update player lastX/lastY for event logic
	player.update();
	// Mushroom collection
	for (var i = 0; i < mushrooms.length; i++) {
		var mush = mushrooms[i];
		if (!mush.collected && player.intersects(mush)) {
			mush.collected = true;
			mush.visible = false;
			score += 1;
			if (score >= mushroomsToNextLevel) {
				canLevelUp = true;
				if (levelGate) {
					levelGate.active = true;
				}
			}
		}
	}
	// Enemy collision
	for (var i = 0; i < enemies.length; i++) {
		var enemy = enemies[i];
		enemy.update();
		if (player.intersects(enemy)) {
			LK.getSound('warn').play();
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
			return;
		}
	}
	// Move all platforms left and spawn new ones from the right
	var platformMoveSpeed = 8;
	var rightEdge = 2048;
	var leftEdge = -200;
	var platformAsset = LK.getAsset('platform', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var platformWidth = platformAsset.width;
	for (var i = platforms.length - 1; i >= 0; i--) {
		var plat = platforms[i];
		plat.x -= platformMoveSpeed;
		// If platform is fully off the left edge, remove and spawn a new one at the right
		if (plat.x < leftEdge) {
			plat.destroy();
			platforms.splice(i, 1);
		}
	}
	// Find the rightmost platform's x
	var rightmostX = -Infinity;
	for (var i = 0; i < platforms.length; i++) {
		if (platforms[i].x > rightmostX) rightmostX = platforms[i].x;
	}
	// If there is space at the right, spawn a new platform
	while (rightmostX < rightEdge) {
		var plat = new Platform();
		plat.x = rightmostX === -Infinity ? platformWidth / 2 : rightmostX + platformWidth;
		plat.y = 2300;
		// Insert platform at the back (behind all other children)
		game.addChildAt(plat, 0);
		platforms.push(plat);
		rightmostX = plat.x;
	}
	// Meteor drop (randomly every 120 ticks)
	if (LK.ticks % 120 === 0) {
		var meteor = new Meteor();
		meteor.x = 400 + Math.floor(Math.random() * 1200);
		meteor.y = -100;
		game.addChild(meteor);
		meteors.push(meteor);
	}
	// Meteor update and collision
	for (var i = meteors.length - 1; i >= 0; i--) {
		var meteor = meteors[i];
		meteor.update();
		if (player.intersects(meteor)) {
			LK.getSound('warn').play();
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
			return;
		}
		if (meteor.y > 2800) {
			meteor.destroy();
			meteors.splice(i, 1);
		}
	}
	// Level gate logic
	if (!levelGate) {
		levelGate = new LevelGate();
		levelGate.x = 1800;
		levelGate.y = 1700;
		game.addChild(levelGate);
	}
	if (player.intersects(levelGate)) {
		if (canLevelUp) {
			LK.showYouWin();
		} else {
			// Play warning sound
			LK.getSound('warn').play();
		}
	}
};
// Score display
var scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Update score display in game.update
var oldGameUpdate = game.update;
game.update = function () {
	scoreTxt.setText(score);
	oldGameUpdate();
};

===================================================================
--- original.js
+++ change.js
@@ -374,15 +374,15 @@
 	var rightmostX = -Infinity;
 	for (var i = 0; i < platforms.length; i++) {
 		if (platforms[i].x > rightmostX) rightmostX = platforms[i].x;
 	}
-	// If there is space at the right, spawn a new platform behind the player
+	// If there is space at the right, spawn a new platform
 	while (rightmostX < rightEdge) {
 		var plat = new Platform();
-		// Place new platform behind the player (left of player)
-		plat.x = player.x - platformWidth;
+		plat.x = rightmostX === -Infinity ? platformWidth / 2 : rightmostX + platformWidth;
 		plat.y = 2300;
-		game.addChild(plat);
+		// Insert platform at the back (behind all other children)
+		game.addChildAt(plat, 0);
 		platforms.push(plat);
 		rightmostX = plat.x;
 	}
 	// Meteor drop (randomly every 120 ticks)