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

/**** 
* Classes
****/ 
// Gear class: represents a single gear that rotates in a given direction and speed
var Gear = Container.expand(function () {
	var self = Container.call(this);
	// Randomly select one of 5 gear assets
	var gearAssetIdx = Math.floor(Math.random() * 5) + 1;
	var gear = self.attachAsset('gear' + gearAssetIdx, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Assign unique sound for this gear type
	// Ensure gear5 uses the correct unique sound asset
	if (gearAssetIdx === 5) {
		self._sound = LK.getSound('gearRotate5');
		self._soundName = 'gearRotate5';
	} else {
		self._sound = LK.getSound('gearRotate' + gearAssetIdx);
		self._soundName = 'gearRotate' + gearAssetIdx;
	}
	self._gearAssetIdx = gearAssetIdx;
	// Set up default size for asset (will be overridden externally)
	gear.width = 270 * 2;
	gear.height = 270 * 2;
	// Rotation speed in radians per frame (set externally)
	self.rotationSpeed = 0;
	// Removed all gear sound logic
	// Update method: rotates the gear
	self.update = function () {
		// Track last rotation for step detection
		if (typeof self._lastRotation === "undefined") {
			self._lastRotation = self.rotation;
		}
		self.rotation += self.rotationSpeed;
		// Play unique sound for this gear type on each full step (e.g. every 1/12 turn)
		var step = Math.PI / 6; // 30 degrees per step
		var lastStep = Math.floor(self._lastRotation / step);
		var currentStep = Math.floor(self.rotation / step);
		if (self.rotationSpeed !== 0 && self._sound && lastStep !== currentStep) {
			// Only play sound if at least one gear of this type is present on screen
			var found = false;
			for (var i = 0; i < gears.length; i++) {
				if (gears[i] && gears[i]._gearAssetIdx === self._gearAssetIdx) {
					found = true;
					break;
				}
			}
			if (found) {
				self._sound.play();
			}
			// Score logic: Only update score when a half rotation is completed
			if (typeof score !== "undefined" && typeof scoreTxt !== "undefined") {
				// Track completed half turns
				if (typeof self._lastHalfTurns === "undefined") {
					self._lastHalfTurns = Math.floor(self._lastRotation / Math.PI);
				}
				var currentHalfTurns = Math.floor(self.rotation / Math.PI);
				if (currentHalfTurns !== self._lastHalfTurns) {
					// Only update score when a half rotation is completed
					if (self.rotationSpeed > 0) {
						score += 1;
					} else if (self.rotationSpeed < 0) {
						score -= 1;
					}
					animateScoreTo(score);
					self._lastHalfTurns = currentHalfTurns;
				}
			}
		}
		self._lastRotation = self.rotation;
	};
	// Handle down event for single tap: remove gear and stop sound
	self.down = function (x, y, obj) {
		// Stop the unique sound for this gear if playing
		if (self._sound && typeof self._sound.stop === "function") {
			self._sound.stop();
			self._soundPlaying = false;
		}
		// Remove from game and gears array
		if (self.parent) {
			self.parent.removeChild(self);
		}
		for (var i = 0; i < gears.length; i++) {
			if (gears[i] === self) {
				gears.splice(i, 1);
				break;
			}
		}
	};
	return self;
});

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

/**** 
* Game Code
****/ 
// We need tween for smooth rotation animations
// Add background image (covers the whole game area)
var bg = LK.getAsset('background', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 0,
	width: 2048,
	height: 2732
});
game.addChild(bg);
// Play background music for the whole game
LK.playMusic('backgroundSong');
// List of all gears in the game
var gears = [];
// Score variable and score text
var score = 0;
var displayScore = 0;
var scoreTween = null;
function formatScore(val) {
	var s = Math.abs(Math.round(val)).toString().padStart(4, "0");
	return (val < 0 ? "-" : "") + s;
}
// Add random target to top left at game start
var targetSign = Math.random() < 0.5 ? -1 : 1;
var targetValue = Math.floor(Math.random() * 10000); // 0 to 9999
var targetText = (targetSign < 0 ? "-" : "") + targetValue.toString().padStart(4, "0");
var targetTxt = new Text2(targetText, {
	size: 150,
	fill: 0xFFD600 // yellow
});
targetTxt.anchor.set(0, 0); // top left
LK.gui.topLeft.addChild(targetTxt);
// Place with margin to avoid menu icon
targetTxt.x = 210;
targetTxt.y = 10;
var scoreTxt = new Text2(formatScore(displayScore), {
	size: 170,
	fill: 0xFFFFFF
});
// Anchor to top right
scoreTxt.anchor.set(1, 0); // right-top
LK.gui.topRight.addChild(scoreTxt);
// Place at top right, with a small margin from the edge
scoreTxt.x = -40;
scoreTxt.y = 10;
// Helper: animate score change smoothly, one by one
function animateScoreTo(target) {
	if (scoreTween) {
		tween.stop(scoreTween);
		scoreTween = null;
	}
	var start = displayScore;
	var end = target;
	if (start === end) {
		displayScore = end;
		scoreTxt.setText(formatScore(displayScore));
		return;
	}
	var step = start < end ? 1 : -1;
	var steps = Math.abs(end - start);
	var durationPerStep = 30; // ms per step, adjust for speed
	var current = start;
	function stepTween() {
		if (current === end) {
			scoreTween = null;
			return;
		}
		current += step;
		displayScore = current;
		scoreTxt.setText(formatScore(displayScore));
		scoreTween = LK.setTimeout(stepTween, durationPerStep);
	}
	stepTween();
}
// For drag/hold/tap detection
var dragStart = null; // {x, y, t}
var dragCurrent = null; // {x, y}
var dragTimer = null;
var dragHold = false;
var dragGearPreview = null;
var dragPreviewGearType = 1; // type of gear to preview/create this drag
var dragDirection = 1; // 1: CW, -1: CCW
var dragSize = 240; // default
var tapThreshold = 200; // ms
var holdThreshold = 220; // ms
var minGear = 120,
	// 2x smaller than before 
	maxGear = 390 * 4; //{G} // Allow up to 2x larger gears
// Helper: calculate angle between two points (in radians)
function getAngle(x1, y1, x2, y2) {
	return Math.atan2(y2 - y1, x2 - x1);
}
// Helper: clamp rotation speed
function clamp(val, min, max) {
	if (val < min) return min;
	if (val > max) return max;
	return val;
}
// Helper: find gear at (x, y)
function findGearAt(x, y) {
	for (var i = 0; i < gears.length; i++) {
		var g = gears[i];
		var dx = g.x - x;
		var dy = g.y - y;
		var r = g.children[0].width / 2;
		if (dx * dx + dy * dy <= r * r) return g;
	}
	return null;
}
// On press down: start drag/tap/hold detection
game.down = function (x, y, obj) {
	dragStart = {
		x: x,
		y: y,
		t: Date.now()
	};
	dragCurrent = {
		x: x,
		y: y
	};
	dragHold = false;
	dragDirection = 1;
	// Default size is mid-way between min and max
	dragSize = (minGear + maxGear) / 2;
	// If tap on existing gear, mark for possible removal
	var gear = findGearAt(x, y);
	if (gear) {
		dragGearPreview = gear;
		return;
	}
	// Start hold timer for gear creation
	dragTimer = LK.setTimeout(function () {
		dragHold = true;
		// Show preview gear
		// Pick a random gear type and remember it for this drag
		dragPreviewGearType = Math.floor(Math.random() * 5) + 1;
		dragGearPreview = new Gear();
		dragGearPreview.x = dragStart.x;
		dragGearPreview.y = dragStart.y;
		dragGearPreview.rotationSpeed = 0;
		dragGearPreview.children[0].width = dragSize;
		dragGearPreview.children[0].height = dragSize;
		dragGearPreview.alpha = 0.5;
		// Replace the gear asset with the selected type
		if (dragGearPreview.children.length > 0) {
			dragGearPreview.removeChild(dragGearPreview.children[0]);
		}
		var previewAsset = dragGearPreview.attachAsset('gear' + dragPreviewGearType, {
			anchorX: 0.5,
			anchorY: 0.5
		});
		previewAsset.width = dragSize;
		previewAsset.height = dragSize;
		game.addChild(dragGearPreview);
	}, holdThreshold);
};
// On move: update drag current position, update preview gear size/direction
game.move = function (x, y, obj) {
	if (!dragStart) return;
	dragCurrent.x = x;
	dragCurrent.y = y;
	if (dragHold && dragGearPreview) {
		// Calculate drag vector
		var dx = dragCurrent.x - dragStart.x;
		var dy = dragCurrent.y - dragStart.y;
		var dist = Math.sqrt(dx * dx + dy * dy);
		// Size: proportional to drag distance, clamp to min/max
		// Map drag distance from 0..(max possible) to minGear..maxGear
		// Let's use up to 900px drag for full range (since maxGear is now 2x larger)
		var maxDragDist = 900;
		var size = clamp(minGear + (maxGear - minGear) * Math.min(dist, maxDragDist) / maxDragDist, minGear, maxGear);
		dragSize = size;
		dragGearPreview.children[0].width = size;
		dragGearPreview.children[0].height = size;
		// Direction: right is CW, left is CCW
		dragDirection = dx >= 0 ? 1 : -1;
		dragGearPreview.scale.x = dragDirection;
		// No speed text shown during drag preview
	}
};
// On release: decide tap/hold/drag action
game.up = function (x, y, obj) {
	if (dragTimer) {
		LK.clearTimeout(dragTimer);
		dragTimer = null;
	}
	var now = Date.now();
	var dt = now - (dragStart ? dragStart.t : now);
	// Tap on existing gear: remove it
	if (dragGearPreview && gears.indexOf(dragGearPreview) !== -1) {
		// Remove gear
		if (dragGearPreview.parent) dragGearPreview.parent.removeChild(dragGearPreview);
		var idx = gears.indexOf(dragGearPreview);
		if (idx !== -1) gears.splice(idx, 1);
		dragGearPreview = null;
		dragStart = null;
		return;
	}
	// Short tap: do nothing (no gear created)
	if (!dragHold && dt < tapThreshold) {
		// No speed text to remove
		dragStart = null;
		dragGearPreview = null;
		return;
	}
	// Hold/drag: create gear at dragStart, with size/direction
	if (dragHold && dragGearPreview) {
		// No speed text to remove
		// Remove preview
		if (dragGearPreview.parent) dragGearPreview.parent.removeChild(dragGearPreview);
		dragGearPreview = null;
		// Prevent overlapping: check if new gear would overlap any existing gear
		var overlap = false;
		for (var i = 0; i < gears.length; i++) {
			var other = gears[i];
			var dxg = dragStart.x - other.x;
			var dyg = dragStart.y - other.y;
			var distg = Math.sqrt(dxg * dxg + dyg * dyg);
			var otherGear = other.children[0].width;
			if (distg < (dragSize + otherGear) / 2 + 10) {
				overlap = true;
				break;
			}
		}
		if (!overlap) {
			var gear = new Gear();
			gear.x = dragStart.x;
			gear.y = dragStart.y;
			// Assign random speed between 0.01 and 0.06, use dragDirection for direction
			var minSpeed = 0.01,
				maxSpeed = 0.06;
			var randomSpeed = minSpeed + Math.random() * (maxSpeed - minSpeed);
			gear.rotationSpeed = randomSpeed * dragDirection;
			// Replace the gear asset with the previewed type
			if (gear.children.length > 0) {
				gear.removeChild(gear.children[0]);
			}
			var asset = gear.attachAsset('gear' + dragPreviewGearType, {
				anchorX: 0.5,
				anchorY: 0.5
			});
			asset.width = dragSize;
			asset.height = dragSize;
			// Set correct sound for this gear type
			if (dragPreviewGearType === 5) {
				gear._sound = LK.getSound('gearRotate5');
				gear._soundName = 'gearRotate5';
			} else {
				gear._sound = LK.getSound('gearRotate' + dragPreviewGearType);
				gear._soundName = 'gearRotate' + dragPreviewGearType;
			}
			gear._gearAssetIdx = dragPreviewGearType;
			game.addChild(gear);
			gears.push(gear);
		}
	}
	dragStart = null;
	dragGearPreview = null;
};
// Update loop: update all gears
game.update = function () {
	for (var i = 0; i < gears.length; i++) {
		if (gears[i].update) {
			gears[i].update();
		}
	}
	// Check win condition: score matches target (including sign)
	if (score === targetSign * targetValue) {
		LK.showYouWin();
	}
};

===================================================================
--- original.js
+++ change.js
@@ -105,10 +105,10 @@
 
 /**** 
 * Game Code
 ****/ 
-// Add background image (covers the whole game area)
 // We need tween for smooth rotation animations
+// Add background image (covers the whole game area)
 var bg = LK.getAsset('background', {
 	anchorX: 0,
 	anchorY: 0,
 	x: 0,
@@ -131,9 +131,9 @@
 }
 // Add random target to top left at game start
 var targetSign = Math.random() < 0.5 ? -1 : 1;
 var targetValue = Math.floor(Math.random() * 10000); // 0 to 9999
-var targetText = (targetSign < 0 ? "-" : "+") + targetValue.toString().padStart(4, "0");
+var targetText = (targetSign < 0 ? "-" : "") + targetValue.toString().padStart(4, "0");
 var targetTxt = new Text2(targetText, {
 	size: 150,
 	fill: 0xFFD600 // yellow
 });