/**** 
* Classes
****/ 
//<Assets used in the game will automatically appear here>
//<Write imports for supported plugins here>
// Class for creating fluid art particles
var FluidParticle = Container.expand(function () {
	var self = Container.call(this);
	// Create and attach a circular asset for the particle
	var particleGraphics = self.attachAsset('particle', {
		anchorX: 0.5,
		anchorY: 0.5,
		blendMode: 1
	});
	// Change the color of the particle to blue
	self.tint = 0x0000FF;
	// Randomize initial properties
	self.speedX = (Math.random() - 0.5) * 10;
	self.speedY = (Math.random() - 0.5) * 10;
	self.alpha = Math.random() * 0.5 + 0.5;
	self.scale.set(Math.random() * 0.5 + 0.5);
	// Update function to animate the particle
	self.update = function () {
		self.x += self.speedX;
		self.y += self.speedY;
		self.alpha -= 0.01;
		if (self.alpha <= 0) {
			self.destroy();
		}
	};
});

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

/**** 
* Game Code
****/ 
// Array to keep track of all fluid particles
var particles = [];
// Function to create a burst of particles at a given position
function createParticleBurst(x, y) {
	for (var i = 0; i < 20; i++) {
		var particle = new FluidParticle();
		particle.attachAsset('particle', {
			color: Math.random() * 0xFFFFFF,
			blendMode: 1
		});
		particle.x = x;
		particle.y = y;
		particles.push(particle);
		game.addChild(particle);
	}
}
// Handle touch or mouse down event to create fluid art
game.down = function (x, y, obj) {
	this.swipeStart = {
		x: x,
		y: y
	};
};
game.move = function (x, y, obj) {
	if (this.swipeStart) {
		var dx = x - this.swipeStart.x;
		var dy = y - this.swipeStart.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance > 50) {
			// Change the color of the particle each swipe
			createParticleBurst(this.swipeStart.x, this.swipeStart.y);
			this.swipeStart = {
				x: x,
				y: y
			};
		}
	}
};
game.up = function (x, y, obj) {
	this.swipeStart = null;
};
// Update function to animate particles
game.update = function () {
	for (var i = particles.length - 1; i >= 0; i--) {
		var particle = particles[i];
		particle.update();
		if (particle.alpha <= 0) {
			particles.splice(i, 1);
		}
	}
};