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

/**** 
* Classes
****/ 
// BearObstacle class (spawns bear image)
var BearObstacle = Container.expand(function () {
	var self = Container.call(this);
	var bear = self.attachAsset('bear', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = bear.width * 0.45;
	self.speed = 0; // Set by game
	// Walking animation: scaleX alternates to simulate walking
	function startBearWalkAnim() {
		// Reset scale
		bear.scaleX = 1;
		// Animate scaleX to 0.85 and back to 1.15, then repeat
		tween(bear, {
			scaleX: 0.85
		}, {
			duration: 120,
			easing: tween.linear,
			onFinish: function onFinish() {
				tween(bear, {
					scaleX: 1.15
				}, {
					duration: 120,
					easing: tween.linear,
					onFinish: startBearWalkAnim
				});
			}
		});
	}
	startBearWalkAnim();
	return self;
});
// Obstacle class (tree or rock)
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	self.type = Math.random() < 0.6 ? 'tree' : 'rock';
	var assetId = self.type === 'tree' ? 'tree' : 'rock';
	var obs = self.attachAsset(assetId, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = obs.width * 0.45;
	self.speed = 0; // Set by game
	return self;
});
// Powerup class (shield or boost)
var Powerup = Container.expand(function () {
	var self = Container.call(this);
	self.kind = Math.random() < 0.5 ? 'shield' : 'boost';
	var assetId = self.kind === 'shield' ? 'shield' : 'boost';
	var pu = self.attachAsset(assetId, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = pu.width * 0.45;
	self.speed = 0; // Set by game
	return self;
});
// Rock2Obstacle class (spawns rock2 image)
var Rock2Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obs = self.attachAsset('rock2', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = obs.width * 0.45;
	self.speed = 0; // Set by game
	return self;
});
// Snowboarder (player) class
var Snowboarder = Container.expand(function () {
	var self = Container.call(this);
	var sb = self.attachAsset('snowboarder', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = sb.width * 0.45; // For collision
	self.hasShield = false;
	self.shieldNode = null;
	// Show shield visual if active
	self.setShield = function (active) {
		self.hasShield = active;
		if (active && !self.shieldNode) {
			self.shieldNode = self.attachAsset('shield', {
				anchorX: 0.5,
				anchorY: 0.5,
				scaleX: 1.3,
				scaleY: 1.3,
				alpha: 0.5
			});
		} else if (!active && self.shieldNode) {
			self.shieldNode.destroy();
			self.shieldNode = null;
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0xffffff // White for snow
});

/**** 
* Game Code
****/ 
// Add background image (snowy background)
var background = LK.getAsset('boost', {
	anchorX: 0.5,
	anchorY: 0,
	scaleX: GAME_WIDTH / 200,
	// 'boost' asset is 200px wide
	scaleY: GAME_HEIGHT / 200,
	// 'boost' asset is 200px tall
	x: GAME_WIDTH / 2,
	y: 0,
	alpha: 0.18 // subtle, not to overpower gameplay
});
game.addChild(background);
// Speed boost powerup
// Shield powerup
// Rock obstacle
// Tree obstacle
// Snowboarder (player)
// Game constants
var GAME_WIDTH = 2048;
var GAME_HEIGHT = 2732;
var PLAY_AREA_MARGIN = 60; // px, left/right margin for obstacles (reduced for denser spread)
var OBSTACLE_MIN_Y_DIST = 320; // Minimum vertical distance between obstacles (denser)
var OBSTACLE_MAX_Y_DIST = 540; // Maximum vertical distance between obstacles (denser)
var OBSTACLE_MIN_X = PLAY_AREA_MARGIN;
var OBSTACLE_MAX_X = GAME_WIDTH - PLAY_AREA_MARGIN;
var POWERUP_CHANCE = 0.12; // Chance to spawn a powerup instead of obstacle
// Intensity increase after 1000 points
var INTENSITY_SCORE_THRESHOLD = 1000;
var INTENSE_OBSTACLE_MIN_Y_DIST = 160; // Denser in intense mode
var INTENSE_OBSTACLE_MAX_Y_DIST = 320;
var INTENSE_POWERUP_CHANCE = 0.16;
// Game state
var snowboarder;
var obstacles = [];
var powerups = [];
var dragNode = null;
var dragOffsetX = 0;
var dragStartX = 0;
var dragStartSnowboarderX = 0;
var lastObstacleY = 0;
var speed = 18; // Initial speed (pixels per frame)
var maxSpeed = 48;
var speedIncreaseEvery = 600; // Increase speed every N ticks
var ticksSinceStart = 0;
var distance = 0; // Distance traveled (score)
var scoreTxt;
var shieldTimer = 0;
var boostTimer = 0;
var isBoosting = false;
// Add 6 vertical wires (lines) from top to bottom of the play area
var wireCount = 6;
var wireColor = 0x888888;
var wireWidth = 12;
var wireSpacing = (GAME_WIDTH - 2 * PLAY_AREA_MARGIN) / (wireCount - 1);
var wires = [];
for (var i = 0; i < wireCount; i++) {
	var wireX = PLAY_AREA_MARGIN + i * wireSpacing;
	var wire = LK.getAsset('wire', {
		width: wireWidth,
		height: GAME_HEIGHT,
		color: wireColor,
		shape: 'box',
		anchorX: 0.5,
		anchorY: 0
	});
	wire.x = wireX;
	wire.y = 0;
	game.addChild(wire);
	wires.push(wire);
}
// Removed static tree background assets from both sides of the screen
var leftTrees = [];
var rightTrees = [];
var treeSpacingY = 320 * 0.95;
// GUI: Score
scoreTxt = new Text2('0', {
	size: 120,
	fill: "#222"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// GUI: Lives
var lives = 3;
var livesTxt = new Text2('❤❤❤', {
	size: 100,
	fill: "#d22"
});
// Anchor to right edge, top (anchorX: 1, anchorY: 0)
livesTxt.anchor.set(1, 0);
// Add to top right of GUI
LK.gui.topRight.addChild(livesTxt);
// Initialize player
snowboarder = new Snowboarder();
game.addChild(snowboarder);
snowboarder.x = GAME_WIDTH / 2;
snowboarder.y = GAME_HEIGHT * 0.12;
// Helper: Clamp value
function clamp(val, min, max) {
	return Math.max(min, Math.min(max, val));
}
// Helper: Distance between two objects
function dist(a, b) {
	var dx = a.x - b.x;
	var dy = a.y - b.y;
	return Math.sqrt(dx * dx + dy * dy);
}
// Spawn an obstacle or powerup
function spawnObstacleOrPowerup(y) {
	// Determine if intensity should be increased
	var scoreVal = Math.floor(distance / 10);
	var minYDist = OBSTACLE_MIN_Y_DIST;
	var maxYDist = OBSTACLE_MAX_Y_DIST;
	var powerupChance = POWERUP_CHANCE;
	if (scoreVal >= INTENSITY_SCORE_THRESHOLD) {
		minYDist = INTENSE_OBSTACLE_MIN_Y_DIST;
		maxYDist = INTENSE_OBSTACLE_MAX_Y_DIST;
		powerupChance = INTENSE_POWERUP_CHANCE;
	}
	if (Math.random() < powerupChance) {
		// Powerup
		var pu = new Powerup();
		pu.x = Math.random() * (OBSTACLE_MAX_X - OBSTACLE_MIN_X) + OBSTACLE_MIN_X;
		pu.y = y;
		pu.speed = speed;
		powerups.push(pu);
		game.addChild(pu);
	} else {
		// Obstacle
		var obs;
		if (scoreVal >= 1000 && Math.random() < 0.10) {
			// After 1000 points, 10% chance to spawn bear
			obs = new BearObstacle();
		} else if (scoreVal >= 500 && Math.random() < 0.33) {
			// After 500 points, 33% chance to spawn rock2
			obs = new Rock2Obstacle();
		} else {
			obs = new Obstacle();
		}
		obs.x = Math.random() * (OBSTACLE_MAX_X - OBSTACLE_MIN_X) + OBSTACLE_MIN_X;
		obs.y = y;
		obs.speed = speed;
		obstacles.push(obs);
		game.addChild(obs);
	}
}
// Initial obstacles
lastObstacleY = snowboarder.y - 600;
for (var i = 0; i < 6; i++) {
	lastObstacleY -= Math.random() * (OBSTACLE_MAX_Y_DIST - OBSTACLE_MIN_Y_DIST) + OBSTACLE_MIN_Y_DIST;
	spawnObstacleOrPowerup(lastObstacleY);
}
// Touch/drag controls
game.down = function (x, y, obj) {
	// Only allow drag if touch is on lower 2/3 of screen (to avoid top menu)
	if (y > GAME_HEIGHT * 0.2) {
		dragNode = snowboarder;
		dragStartX = x;
		dragStartSnowboarderX = snowboarder.x;
	}
};
game.move = function (x, y, obj) {
	if (dragNode === snowboarder) {
		var dx = x - dragStartX;
		var newX = clamp(dragStartSnowboarderX + dx, OBSTACLE_MIN_X, OBSTACLE_MAX_X);
		snowboarder.x = newX;
		// Rotate snowboarder to face movement direction
		if (Math.abs(dx) > 8) {
			// Limit max angle to 30 degrees (PI/6)
			var maxAngle = Math.PI / 6;
			var angle = clamp(dx / 400, -1, 1) * maxAngle;
			snowboarder.rotation = angle;
		} else {
			snowboarder.rotation = 0;
		}
	}
};
game.up = function (x, y, obj) {
	dragNode = null;
	if (snowboarder) snowboarder.rotation = 0;
};
// Main game loop
game.update = function () {
	ticksSinceStart++;
	// Increase speed over time
	if (ticksSinceStart % speedIncreaseEvery === 0 && speed < maxSpeed) {
		speed += 2;
	}
	// Speed scaling: increase by 20% for each 1000 points after the first 1000 points
	var scoreVal = Math.floor(distance / 10);
	if (scoreVal >= 1000) {
		// Number of 1000-point steps after the first 1000
		var speedSteps = Math.floor((scoreVal - 1000) / 1000) + 1;
		var scaledSpeed = speed * Math.pow(1.2, speedSteps);
		// Clamp to maxSpeed if needed
		if (scaledSpeed > maxSpeed) {
			scaledSpeed = maxSpeed;
		}
		speed = scaledSpeed;
	}
	// If boosting, increase speed temporarily
	var currentSpeed = isBoosting ? speed * 1.7 : speed;
	// Move side trees up (reverse flow)
	for (var i = 0; i < leftTrees.length; i++) {
		leftTrees[i].y -= currentSpeed;
		// If tree goes off top, move it to bottom
		if (leftTrees[i].y < -200) {
			leftTrees[i].y += treeSpacingY * leftTrees.length;
		}
	}
	for (var i = 0; i < rightTrees.length; i++) {
		rightTrees[i].y -= currentSpeed;
		if (rightTrees[i].y < -200) {
			rightTrees[i].y += treeSpacingY * rightTrees.length;
		}
	}
	// Move obstacles and powerups up (reverse flow)
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obs = obstacles[i];
		obs.y -= currentSpeed;
		obs.speed = currentSpeed;
		// If this is a BearObstacle, move it left to right
		if (obs instanceof BearObstacle) {
			// Initialize direction and lastX if not set
			if (typeof obs.bearDirection === "undefined") {
				obs.bearDirection = 1; // 1 = right, -1 = left
			}
			if (typeof obs.lastX === "undefined") {
				obs.lastX = obs.x;
			}
			// Move bear horizontally
			var bearSpeedX = 12; // px per frame, adjust for desired speed
			obs.x += obs.bearDirection * bearSpeedX;
			// Bounce at screen edges
			if (obs.x > OBSTACLE_MAX_X && obs.bearDirection > 0 || obs.x < OBSTACLE_MIN_X && obs.bearDirection < 0) {
				obs.bearDirection *= -1;
				// Clamp to edge
				obs.x = clamp(obs.x, OBSTACLE_MIN_X, OBSTACLE_MAX_X);
			}
			obs.lastX = obs.x;
		}
		// Remove if off screen (now above screen)
		if (obs.y + obs.height / 2 < -100) {
			obs.destroy();
			obstacles.splice(i, 1);
		}
	}
	for (var i = powerups.length - 1; i >= 0; i--) {
		var pu = powerups[i];
		pu.y -= currentSpeed;
		pu.speed = currentSpeed;
		// Remove if off screen (now above screen)
		if (pu.y + pu.height / 2 < -100) {
			pu.destroy();
			powerups.splice(i, 1);
		}
	}
	// Continuously spawn obstacles and powerups as the player progresses (now below player)
	while (lastObstacleY < snowboarder.y + 3000) {
		// Use more intense spawn distances after threshold
		var scoreVal = Math.floor(distance / 10);
		var minYDist = OBSTACLE_MIN_Y_DIST;
		var maxYDist = OBSTACLE_MAX_Y_DIST;
		if (scoreVal >= INTENSITY_SCORE_THRESHOLD) {
			minYDist = INTENSE_OBSTACLE_MIN_Y_DIST;
			maxYDist = INTENSE_OBSTACLE_MAX_Y_DIST;
		}
		lastObstacleY += Math.random() * (maxYDist - minYDist) + minYDist;
		spawnObstacleOrPowerup(lastObstacleY);
	}
	// Obstacles and powerups keep coming endlessly as the player progresses
	// Always ensure obstacles continue to spawn all game, even if the player is not moving
	if (obstacles.length < 8) {
		// If for any reason there are too few obstacles, spawn more to keep the game challenging
		var scoreVal = Math.floor(distance / 10);
		var minYDist = OBSTACLE_MIN_Y_DIST;
		var maxYDist = OBSTACLE_MAX_Y_DIST;
		if (scoreVal >= INTENSITY_SCORE_THRESHOLD) {
			minYDist = INTENSE_OBSTACLE_MIN_Y_DIST;
			maxYDist = INTENSE_OBSTACLE_MAX_Y_DIST;
		}
		lastObstacleY += Math.random() * (maxYDist - minYDist) + minYDist;
		spawnObstacleOrPowerup(lastObstacleY);
	}
	// Collision: obstacles
	var scoreVal = Math.floor(distance / 10);
	// Track if snowboarder was colliding with any obstacle last frame
	if (typeof snowboarder.lastWasHit === "undefined") snowboarder.lastWasHit = false;
	var hitThisFrame = false;
	for (var i = 0; i < obstacles.length; i++) {
		var obs = obstacles[i];
		if (dist(snowboarder, obs) < snowboarder.radius + obs.radius) {
			if (scoreVal < 200) {
				// Protect from collision in first 200 points: ignore collision
				// Optionally, flash snowboarder to indicate invulnerability
				LK.effects.flashObject(snowboarder, 0x66ffcc, 300);
			} else {
				if (snowboarder.hasShield) {
					snowboarder.setShield(false);
					// Flash snowboarder
					LK.effects.flashObject(snowboarder, 0xffe066, 600);
				} else {
					hitThisFrame = true;
				}
			}
			// Only check first collision for life loss
			break;
		}
	}
	// Only deduct a life if we were not hit last frame and are hit this frame
	if (!snowboarder.lastWasHit && hitThisFrame) {
		lives -= 1;
		// Clamp lives to minimum 0
		if (lives < 0) lives = 0;
		// Update lives display
		var heartStr = '';
		for (var i = 0; i < lives; i++) heartStr += '❤';
		livesTxt.setText(heartStr);
		LK.effects.flashScreen(0xff0000, 900);
		if (lives <= 0) {
			LK.showGameOver();
			return;
		}
	}
	snowboarder.lastWasHit = hitThisFrame;
	// Collision: powerups
	for (var i = powerups.length - 1; i >= 0; i--) {
		var pu = powerups[i];
		if (dist(snowboarder, pu) < snowboarder.radius + pu.radius) {
			if (pu.kind === 'shield') {
				snowboarder.setShield(true);
				shieldTimer = 360; // 6 seconds at 60fps
			} else if (pu.kind === 'boost') {
				isBoosting = true;
				boostTimer = 180; // 3 seconds at 60fps
				// Flash snowboarder red for boost
				LK.effects.flashObject(snowboarder, 0xff3b3b, 400);
			}
			pu.destroy();
			powerups.splice(i, 1);
		}
	}
	// Powerup timers
	if (snowboarder.hasShield) {
		shieldTimer--;
		if (shieldTimer <= 0) {
			snowboarder.setShield(false);
		}
	}
	if (isBoosting) {
		boostTimer--;
		if (boostTimer <= 0) {
			isBoosting = false;
		}
	}
	// Snowboarder stays at the top; do not move snowboarder down the screen (reverse flow)
	// snowboarder.y += currentSpeed;
	// Score: distance traveled
	distance += currentSpeed;
	var scoreVal = Math.floor(distance / 10);
	LK.setScore(scoreVal);
	scoreTxt.setText(scoreVal);
	// Endless game: no win condition, continues until hit
};
/* End of game code */

===================================================================
--- original.js
+++ change.js
@@ -114,14 +114,27 @@
 
 /**** 
 * Game Code
 ****/ 
-// Game constants
-// Snowboarder (player)
-// Tree obstacle
-// Rock obstacle
-// Shield powerup
+// Add background image (snowy background)
+var background = LK.getAsset('boost', {
+	anchorX: 0.5,
+	anchorY: 0,
+	scaleX: GAME_WIDTH / 200,
+	// 'boost' asset is 200px wide
+	scaleY: GAME_HEIGHT / 200,
+	// 'boost' asset is 200px tall
+	x: GAME_WIDTH / 2,
+	y: 0,
+	alpha: 0.18 // subtle, not to overpower gameplay
+});
+game.addChild(background);
 // Speed boost powerup
+// Shield powerup
+// Rock obstacle
+// Tree obstacle
+// Snowboarder (player)
+// Game constants
 var GAME_WIDTH = 2048;
 var GAME_HEIGHT = 2732;
 var PLAY_AREA_MARGIN = 60; // px, left/right margin for obstacles (reduced for denser spread)
 var OBSTACLE_MIN_Y_DIST = 320; // Minimum vertical distance between obstacles (denser)