package tim.prune.data;
+import tim.prune.config.Config;
+
/**
* Class to provide distance constants and functions
*/
public abstract class Distance
{
- // distance formats
- public static final int UNITS_KILOMETRES = 1;
- public static final int UNITS_MILES = 2;
-
// Geographical constants
- private static final double EARTH_RADIUS_KM = 6372.795;
- private static final double EARTH_RADIUS_MILES = 3959.8712255;
- // Conversion constants
- private static final double CONVERT_KM_TO_MILES = 1.609344;
- private static final double CONVERT_MILES_TO_KM = 0.621371192;
+ /** Earth radius in metres */
+ private static final double EARTH_RADIUS_M = 6372795.0;
+
+ /**
+ * Convert the given angle in radians into a distance
+ * @param inAngDist angular distance in radians
+ * @return distance in currently configured distance units
+ */
+ public static double convertRadiansToDistance(double inAngDist)
+ {
+ return convertRadiansToDistance(inAngDist, Config.getUnitSet().getDistanceUnit());
+ }
/**
* Convert the given angle in radians into a distance
* @param inAngDist angular distance in radians
- * @param inUnits desired units, miles or km
- * @return distance in specified format
+ * @param inUnit distance units
+ * @return distance in specified distance units
*/
- public static double convertRadians(double inAngDist, int inUnits)
+ public static double convertRadiansToDistance(double inAngDist, Unit inUnit)
{
// Multiply by appropriate factor
- if (inUnits == UNITS_MILES)
- return inAngDist * EARTH_RADIUS_MILES;
- return inAngDist * EARTH_RADIUS_KM;
+ return inAngDist * EARTH_RADIUS_M * inUnit.getMultFactorFromStd();
}
+ /**
+ * Convert the given distance into an angle in radians
+ * @param inDist distance to convert in the current distance units
+ * @return angular distance in radians
+ */
+ public static double convertDistanceToRadians(double inDist)
+ {
+ return convertDistanceToRadians(inDist, Config.getUnitSet().getDistanceUnit());
+ }
+
+ /**
+ * Convert the given distance into an angle in radians
+ * @param inDist distance to convert in the current distance units
+ * @param inUnit distance unit
+ * @return angular distance in radians
+ */
+ public static double convertDistanceToRadians(double inDist, Unit inUnit)
+ {
+ // Divide by appropriate factor
+ return inDist / EARTH_RADIUS_M / inUnit.getMultFactorFromStd();
+ }
}