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package com.mapbox.mapboxsdk.geometry;
import android.location.Location;
import android.os.Parcel;
import android.os.Parcelable;
import com.mapbox.services.android.telemetry.constants.GeoConstants;
import com.mapbox.services.android.telemetry.utils.MathUtils;
/**
* A geographical location which contains a single latitude, longitude pair, with
* optional altitude.
* <p>
* Latitude and longitude are expressed as decimal degrees
* in the WGS84 datum. By default, altitude is 0.0, or sea level.
* </p>
* <p>
* Mapbox GL displays maps in the Mercator Projection and projects geographical
* data automatically, so all data enters in the WGS84 datum.
* </p>
*/
public class LatLng implements ILatLng, Parcelable {
public static final Parcelable.Creator<LatLng> CREATOR = new Parcelable.Creator<LatLng>() {
public LatLng createFromParcel(Parcel in) {
return new LatLng(in);
}
public LatLng[] newArray(int size) {
return new LatLng[size];
}
};
private double latitude;
private double longitude;
private double altitude = 0.0;
/**
* Construct a new latitude, longitude point at (0, 0)
*/
public LatLng() {
this.latitude = 0.0;
this.longitude = 0.0;
}
/**
* Construct a new latitude, longitude point given float arguments
*
* @param latitude Latitude in degrees
* @param longitude Longitude in degrees
*/
public LatLng(double latitude, double longitude) {
setLatitude(latitude);
setLongitude(longitude);
}
/**
* Construct a new latitude, longitude, altitude point given float arguments
*
* @param latitude Latitude in degrees
* @param longitude Longitude in degress
* @param altitude Altitude in meters
*/
public LatLng(double latitude, double longitude, double altitude) {
setLatitude(latitude);
setLongitude(longitude);
setAltitude(altitude);
}
/**
* Transform a Location into a LatLng point
*
* @param location Android Location
*/
public LatLng(Location location) {
this(location.getLatitude(), location.getLongitude(), location.getAltitude());
}
/**
* Clone an existing latitude longitude point
*
* @param aLatLng LatLng
*/
public LatLng(LatLng aLatLng) {
this.latitude = aLatLng.latitude;
this.longitude = aLatLng.longitude;
this.altitude = aLatLng.altitude;
}
protected LatLng(Parcel in) {
setLatitude(in.readDouble());
setLongitude(in.readDouble());
setAltitude(in.readDouble());
}
public void setLatitude(double latitude) {
if (Double.isNaN(latitude)) {
throw new IllegalArgumentException("latitude must not be NaN");
}
if (Math.abs(latitude) > 90.0) {
throw new IllegalArgumentException("latitude must be between -90 and 90");
}
this.latitude = latitude;
}
@Override
public double getLatitude() {
return latitude;
}
public void setLongitude(double longitude) {
if (Double.isNaN(longitude)) {
throw new IllegalArgumentException("longitude must not be NaN");
}
if (Double.isInfinite(longitude)) {
throw new IllegalArgumentException("longitude must not be infinite");
}
this.longitude = longitude;
}
@Override
public double getLongitude() {
return longitude;
}
public void setAltitude(double altitude) {
this.altitude = altitude;
}
@Override
public double getAltitude() {
return altitude;
}
/**
* Return a new LatLng object with a wrapped Longitude. This allows original data object
* to remain unchanged.
*
* @return New LatLng object with wrapped Longitude
*/
public LatLng wrap() {
longitude = MathUtils.wrap(longitude, GeoConstants.MIN_LONGITUDE, GeoConstants.MAX_LONGITUDE);
return this;
}
@Override
public boolean equals(Object object) {
if (this == object) {
return true;
}
if (object == null || getClass() != object.getClass()) {
return false;
}
LatLng latLng = (LatLng) object;
return Double.compare(latLng.altitude, altitude) == 0 && Double.compare(latLng.latitude, latitude) == 0
&& Double.compare(latLng.longitude, longitude) == 0;
}
@Override
public int hashCode() {
int result;
long temp;
temp = Double.doubleToLongBits(latitude);
result = (int) (temp ^ (temp >>> 32));
temp = Double.doubleToLongBits(longitude);
result = 31 * result + (int) (temp ^ (temp >>> 32));
temp = Double.doubleToLongBits(altitude);
result = 31 * result + (int) (temp ^ (temp >>> 32));
return result;
}
@Override
public String toString() {
return "LatLng [latitude=" + latitude + ", longitude=" + longitude + ", altitude=" + altitude + "]";
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel out, int flags) {
out.writeDouble(latitude);
out.writeDouble(longitude);
out.writeDouble(altitude);
}
/**
* Calculate distance between two points
*
* @param other Other LatLng to compare to
* @return distance in meters
*/
public double distanceTo(LatLng other) {
if (latitude == other.latitude && longitude == other.longitude) {
// return 0.0 to avoid a NaN
return 0.0;
}
final double a1 = Math.toRadians(this.latitude);
final double a2 = Math.toRadians(this.longitude);
final double b1 = Math.toRadians(other.getLatitude());
final double b2 = Math.toRadians(other.getLongitude());
final double cosa1 = Math.cos(a1);
final double cosb1 = Math.cos(b1);
final double t1 = cosa1 * Math.cos(a2) * cosb1 * Math.cos(b2);
final double t2 = cosa1 * Math.sin(a2) * cosb1 * Math.sin(b2);
final double t3 = Math.sin(a1) * Math.sin(b1);
final double tt = Math.acos(t1 + t2 + t3);
return GeoConstants.RADIUS_EARTH_METERS * tt;
}
}
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