ucar.unidata.geoloc.LatLonPointImpl Maven / Gradle / Ivy
/*
* Copyright 1998-2009 University Corporation for Atmospheric Research/Unidata
*
* Portions of this software were developed by the Unidata Program at the
* University Corporation for Atmospheric Research.
*
* Access and use of this software shall impose the following obligations
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* any fee or cost, to use, copy, modify, alter, enhance and distribute
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*/
package ucar.unidata.geoloc;
import ucar.unidata.util.Format;
/**
* Standard implementation of LatLonPoint.
* Longitude is always between -180 and +180 deg.
* Latitude is always between -90 and +90 deg.
*
* @author Russ Rew
* @author John Caron
* @see LatLonPoint
*/
public class LatLonPointImpl implements LatLonPoint, java.io.Serializable {
/**
* Test if point lies between two longitudes, deal with wrapping.
*
* @param lon point to test
* @param lonBeg beginning longitude
* @param lonEnd ending longitude
* @return true if lon is between lonBeg and lonEnd.
* @deprecated
*/
static public boolean betweenLon(double lon, double lonBeg, double lonEnd) {
lonBeg = lonNormal(lonBeg, lon);
lonEnd = lonNormal(lonEnd, lon);
return (lon >= lonBeg) && (lon <= lonEnd);
}
static public double getClockwiseDistanceTo(double from, double to) {
double distance = to - from;
while (distance < 0.0)
distance += 360.0;
return distance;
}
/**
* put longitude into the range [-180, 180] deg
*
* @param lon lon to normalize
* @return longitude in range [-180, 180] deg
*/
static public double range180(double lon) {
return lonNormal(lon);
}
/**
* put longitude into the range [0, 360] deg
*
* @param lon lon to normalize
* @return longitude into the range [0, 360] deg
*/
static public double lonNormal360(double lon) {
return lonNormal(lon, 180.0);
}
/**
* put longitude into the range [center +/- 180] deg
*
* @param lon lon to normalize
* @param center center point
* @return longitude into the range [center +/- 180] deg
*/
static public double lonNormal(double lon, double center) {
return center + Math.IEEEremainder(lon - center, 360.0);
}
/**
* put longitude into the range [start, start+360] deg
*
* @param lon lon to normalize
* @param start starting point
* @return longitude into the range [center +/- 180] deg
*/
static public double lonNormalFrom(double lon, double start) {
while (lon < start) lon += 360;
while (lon > start+360) lon -= 360;
return lon;
}
/**
* Normalize the longitude to lie between +/-180
*
* @param lon east latitude in degrees
* @return normalized lon
*/
static public double lonNormal(double lon) {
if ((lon < -180.) || (lon > 180.)) {
return Math.IEEEremainder(lon, 360.0);
} else {
return lon;
}
}
/**
* Normalize the latitude to lie between +/-90
*
* @param lat north latitude in degrees
* @return normalized lat
*/
static public double latNormal(double lat) {
if (lat < -90.) {
return -90.;
} else if (lat > 90.) {
return 90.;
} else {
return lat;
}
}
/**
* Make a nicely formatted representation of a latitude, eg 40.34N or 12.9S.
*
* @param lat the latitude.
* @param sigDigits numer of significant digits to display.
* @return String representation.
*/
static public String latToString(double lat, int sigDigits) {
boolean is_north = (lat >= 0.0);
if (!is_north) {
lat = -lat;
}
StringBuilder latBuff = new StringBuilder(20);
latBuff.setLength(0);
latBuff.append(Format.d(lat, sigDigits));
latBuff.append(is_north
? "N"
: "S");
return latBuff.toString();
}
/**
* Make a nicely formatted representation of a longitude, eg 120.3W or 99.99E.
*
* @param lon the longitude.
* @param sigDigits numer of significant digits to display.
* @return String representation.
*/
static public String lonToString(double lon, int sigDigits) {
double wlon = lonNormal(lon);
boolean is_east = (wlon >= 0.0);
if (!is_east) {
wlon = -wlon;
}
StringBuilder lonBuff = new StringBuilder(20);
lonBuff.setLength(0);
lonBuff.append(Format.d(wlon, sigDigits));
lonBuff.append(is_east
? "E"
: "W");
return lonBuff.toString();
}
///////////////////////////////////////////////////////////////////////////////////
/**
* East latitude in degrees, always +/- 90
*/
private double lat;
/**
* North longitude in degrees, always +/- 180
*/
private double lon;
/**
* Default constructor with values 0,0.
*/
public LatLonPointImpl() {
this(0.0, 0.0);
}
/**
* Copy Constructor.
*
* @param pt point to copy
*/
public LatLonPointImpl(LatLonPoint pt) {
this(pt.getLatitude(), pt.getLongitude());
}
/**
* Creates a LatLonPoint from component latitude and longitude values.
* The longitude is adjusted to be in the range [-180.,180.].
*
* @param lat north latitude in degrees
* @param lon east longitude in degrees
*/
public LatLonPointImpl(double lat, double lon) {
setLatitude(lat);
setLongitude(lon);
}
/**
* Returns the longitude, in degrees.
*
* @return the longitude, in degrees
*/
public double getLongitude() {
return lon;
}
/**
* Returns the latitude, in degrees.
*
* @return the latitude, in degrees
*/
public double getLatitude() {
return lat;
}
/**
* set lat, lon using values of pt
*
* @param pt point to use
*/
public void set(LatLonPoint pt) {
setLongitude(pt.getLongitude());
setLatitude(pt.getLatitude());
}
/**
* set lat, lon using double values
*
* @param lat lat value
* @param lon lon value
*/
public void set(double lat, double lon) {
setLongitude(lon);
setLatitude(lat);
}
/**
* set lat, lon using float values
*
* @param lat lat value
* @param lon lon value
*/
public void set(float lat, float lon) {
setLongitude((double) lon);
setLatitude((double) lat);
}
/**
* Set the longitude, in degrees. It is normalized to +/-180.
*
* @param lon east longitude in degrees
*/
public void setLongitude(double lon) {
this.lon = lonNormal(lon);
}
/**
* Set the latitude, in degrees. Must lie beween +/-90
*
* @param lat north latitude in degrees
*/
public void setLatitude(double lat) {
this.lat = latNormal(lat);
}
/**
* Check for equality with another object.
*
* @param obj object to check
* @return true if this represents the same point as pt
*/
public boolean equals(Object obj) {
if (!(obj instanceof LatLonPointImpl)) {
return false;
}
LatLonPointImpl that = (LatLonPointImpl) obj;
return (this.lat == that.lat) && (this.lon == that.lon);
}
/**
* Check for equality with another point.
*
* @param pt point to check
* @return true if this represents the same point as pt
*/
public boolean equals(LatLonPoint pt) {
boolean lonOk = closeEnough(pt.getLongitude(), this.lon);
if (!lonOk) {
lonOk = closeEnough(lonNormal360(pt.getLongitude()),
lonNormal360(this.lon));
}
return lonOk && closeEnough(pt.getLatitude(), this.lat);
}
/**
* Check to see if the values are close enough.
*
* @param d1 first value
* @param d2 second value
* @return true if they are pretty close
*/
private boolean closeEnough(double d1, double d2) {
// TODO: This should be moved to a utility method in ucar.util
// that all ucar classes could use.
if (d1 != 0.0) {
return Math.abs((d1 - d2) / d1) < 1.0e-9;
}
if (d2 != 0.0) {
return Math.abs((d1 - d2) / d2) < 1.0e-9;
}
return true;
}
/**
* Default string representation
*
* @return string representing this point
*/
public String toString() {
return toString(4);
}
/**
* String representation in the form, eg 40.23N 105.1W
*
* @param sigDigits significant digits
* @return String representation
*/
public String toString(int sigDigits) {
StringBuilder sbuff = new StringBuilder(40);
sbuff.setLength(0);
sbuff.append(latToString(lat, sigDigits));
sbuff.append(" ");
sbuff.append(lonToString(lon, sigDigits));
return sbuff.toString();
}
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