jsgame/js/paddle.js

function Paddle(options) {
	if (typeof(options) == 'undefined') options={};
	var x = options.x !== undefined ? options.x : 0;
	var y = options.y !== undefined ? options.y : 0;
	var sx = options.sx !== undefined ? options.sx : 0;
	var size = options.size !== undefined ? options.size : 0;

	function movePaddle(dir) {
		x += dir * sx;
	}

	function getX1() {
		return x - (size / 2);
	}

	function getX2() {
		return x + (size / 2);
	}

	function getY() {
		return y;
	}

	function increaseDifficulty() {
		size -= 4;
		if (size < 20) {
			size = 20;
		}
		sx += 2;
	}

	function update(ctx) {
		if (x <= (size / 2)) {
			x = size / 2;
		}
		if (x >= (ctx.canvas.width - (size / 2))) {
			x = (ctx.canvas.width - (size / 2));
		}
	}

	function draw(ctx) {
		ctx.beginPath();
		ctx.fillStyle = '#000000';
		ctx.strokeStyle = '#000000';
		ctx.lineWidth = 5;
		ctx.moveTo(x - size / 2, y);
		ctx.lineTo(x + size / 2, y);
		ctx.stroke();
	}

	return {
		'x': x,
		'y': y,
		'sx': sx,
		'size': size,
		'movePaddle': movePaddle,
		'getX1': getX1,
		'getX2': getX2,
		'getY': getY,
		'increaseDifficulty': increaseDifficulty,
		'update': update,
		'draw': draw
	};
}