Encapsulates functionality for zooming/scaling coordinates. Includes methods for Size[F]'s, Point[F]'s, Rectangle[F]'s, and various scalars
		public static ScaleFactor Max (ScaleFactor lhs, ScaleFactor rhs)
		{
			if (lhs > rhs) {
				return lhs;
			} else {
				return lhs;
			}
		}
		public static ScaleFactor Min (ScaleFactor lhs, ScaleFactor rhs)
		{
			if (lhs < rhs) {
				return lhs;
			} else {
				return rhs;
			}
		}
		public static ScaleFactor UseIfValid (int numerator, int denominator, ScaleFactor lastResort)
		{
			if (numerator <= 0 || denominator <= 0) {
				return lastResort;
			} else {
				return new ScaleFactor (numerator, denominator);
			}
		}
		public static ScaleFactor Max (int n1, int d1, int n2, int d2, ScaleFactor lastResort)
		{
			ScaleFactor a = UseIfValid (n1, d1, lastResort);
			ScaleFactor b = UseIfValid (n2, d2, lastResort);
			return ScaleFactor.Max (a, b);
		}