PandaLib/src/fr/pandacube/java/util/measurement/DistanceUtil.java

package fr.pandacube.java.util.measurement;

import java.text.DecimalFormat;
import java.util.Arrays;

public class DistanceUtil {

	public static String distanceToString(double meterDist, int precision, DistanceUnit... desiredUnits) {
		
		
		Arrays.sort(desiredUnits);
		
		DistanceUnit choosenUnit = desiredUnits[0]; // la plus petite unitée
		for (DistanceUnit unit : desiredUnits) {
			if (meterDist / unit.multiplicator < 1)
				continue;
			choosenUnit = unit;
		}
		
		if (choosenUnit != desiredUnits[0] && precision <= 2)
			precision = 2;
		
		
		String precisionFormat = "##0";
		if (precision > 0)
			precisionFormat += ".";
		for (int i=0;i<precision; i++)
			precisionFormat += "0";
		DecimalFormat df = new DecimalFormat(precisionFormat);
		
		double dist = meterDist / choosenUnit.multiplicator;
		
		return df.format(dist)+choosenUnit.unitStr;
	}
	
	public static String distanceToString(double meterDist, int precision) {
		return distanceToString(meterDist, precision, DistanceUnit.M, DistanceUnit.KM);
	}
	
	
	
	
	
	
	public enum DistanceUnit implements Comparable<DistanceUnit> {
		NM(0.000000001, "nm"),
		µM(0.000001, "µm"),
		MM(0.001, "mm"),
		CM(0.01, "cm"),
		M(1, "m"),
		KM(1000, "km");
		
		
		private final double multiplicator;
		private final String unitStr;
		
		private DistanceUnit(double mult, String s) {
			multiplicator = mult;
			unitStr = s;
		}
	}
	
}