Method round

ij/src/main/java/ij/plugin/ScaleBar.java:855–860

Rounds down a positive value such that the first digit is 1, 2, or 5

(double x)

		}
		/** Rounds down a positive value such that the first digit is 1, 2, or 5 */
		static double round(double x) {
			double base = Math.pow(10, Math.floor(Math.log10(x)+1e-8));
			if (x > 4.999999*base) return 5*base;
			else if (x > 1.999999*base) return 2*base;
			else return base;
		}
	} // Utils inner class 
} //ScaleBar class