public void paintComponent(Graphics g) {
		super.paintComponent(g);
		
		double alpha = 0.9;
		double w = WIDTH / (NUM_COLUMNAS + (NUM_COLUMNAS + 1) * alpha);
		double gapX = alpha * w;
		double dx = w + gapX;
		double gapY = (HEIGHT - NUM_FILAS * w) / (NUM_FILAS + 1);
		double dy = w + gapY;
		double x = 0;
		double y = 0;
		
		for (int i=0;i<NUM_FILAS;i++) {
			x = 0;
			y += dy;
			for (int j=0;j<NUM_COLUMNAS;j++) {
				x += dx;
				g.drawRect((int)x, (int)y, (int)w, (int)w);
			}
		}
	}