private double getAlpha(double x, double y)
	{
		/* Calculates alpha value according to given (x, y) coordinates using trigonometry.
		   Defines a special case for when x's value is 0. */

		if (x != 0)
		{
			double alpha = Math.atan(y / x) / Math.PI * 180;
			return Math.round(alpha * 10000) / (double) 10000;
		}
		else
			return 90.0;
	} // End of private method getAlpha