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package cgeo.geocaching.geopoint;
import cgeo.geocaching.Settings;
import org.apache.commons.lang3.tuple.ImmutablePair;
public class Units {
public static ImmutablePair<Double, String> scaleDistance(final double distanceKilometers) {
double distance;
String units;
if (Settings.isUseMetricUnits()) {
if (distanceKilometers >= 1) {
distance = distanceKilometers;
units = "km";
} else {
distance = distanceKilometers * 1000;
units = "m";
}
} else {
distance = distanceKilometers / IConversion.MILES_TO_KILOMETER;
if (distance >= 0.1) {
units = "mi";
} else {
distance *= 5280;
units = "ft";
}
}
return new ImmutablePair<Double, String>(distance, units);
}
public static String getDistanceFromKilometers(final Float distanceKilometers) {
if (distanceKilometers == null) {
return "?";
}
final ImmutablePair<Double, String> scaled = scaleDistance(distanceKilometers);
String formatString;
if (scaled.left >= 100) {
formatString = "%.0f";
} else if (scaled.left >= 10) {
formatString = "%.1f";
} else {
formatString = "%.2f";
}
return String.format(formatString + " %s", scaled.left, scaled.right);
}
/**
* Get human readable elevation, depending on settings for metric units.
* Result is rounded to full meters/feet, as the sensors don't have that precision anyway.
*
* @param meters
* @return
*/
public static String getElevation(float meters) {
final ImmutablePair<Double, String> scaled = scaleDistance(meters / 1000f);
return (meters >= 0 ? "↥ " : "↧ ") + String.format("%d %s", Math.abs(Math.round(scaled.left)), scaled.right);
}
public static String getDistanceFromMeters(float meters) {
return getDistanceFromKilometers(meters / 1000f);
}
public static String getSpeed(float kilometersPerHour) {
final String speed = getDistanceFromKilometers(kilometersPerHour);
if (speed.endsWith("mi")) {
return speed.substring(0, speed.length() - 2) + "mph";
}
return speed + (Settings.isUseMetricUnits() ? "/h" : "ph");
}
}
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