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/*
* Copyright 2015 Anton Tananaev (anton@traccar.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.traccar.helper;
public final class UnitsConverter {
private static final double KNOTS_TO_KPH_RATIO = 0.539957;
private static final double KNOTS_TO_MPH_RATIO = 0.868976;
private static final double KNOTS_TO_MPS_RATIO = 1.94384;
private static final double KNOTS_TO_CPS_RATIO = 0.0194384449;
private static final double METERS_TO_FEET_RATIO = 0.3048;
private static final double METERS_TO_MILE_RATIO = 1609.34;
private static final long MILLISECONDS_TO_HOURS_RATIO = 3600000;
private static final long MILLISECONDS_TO_MINUTES_RATIO = 60000;
private UnitsConverter() {
}
public static double knotsFromKph(double value) { // km/h
return value * KNOTS_TO_KPH_RATIO;
}
public static double kphFromKnots(double value) {
return value / KNOTS_TO_KPH_RATIO;
}
public static double knotsFromMph(double value) {
return value * KNOTS_TO_MPH_RATIO;
}
public static double mphFromKnots(double value) {
return value / KNOTS_TO_MPH_RATIO;
}
public static double knotsFromMps(double value) { // m/s
return value * KNOTS_TO_MPS_RATIO;
}
public static double mpsFromKnots(double value) {
return value / KNOTS_TO_MPS_RATIO;
}
public static double knotsFromCps(double value) { // cm/s
return value * KNOTS_TO_CPS_RATIO;
}
public static double feetFromMeters(double value) {
return value / METERS_TO_FEET_RATIO;
}
public static double metersFromFeet(double value) {
return value * METERS_TO_FEET_RATIO;
}
public static double milesFromMeters(double value) {
return value / METERS_TO_MILE_RATIO;
}
public static double metersFromMiles(double value) {
return value * METERS_TO_MILE_RATIO;
}
public static long msFromHours(long value) {
return value * MILLISECONDS_TO_HOURS_RATIO;
}
public static long msFromHours(double value) {
return (long) (value * MILLISECONDS_TO_HOURS_RATIO);
}
public static long msFromMinutes(long value) {
return value * MILLISECONDS_TO_MINUTES_RATIO;
}
}
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