117 lines
3.3 KiB
Java
117 lines
3.3 KiB
Java
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/*
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* Author: Cedric Holzl - Mohamed Khadri
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* Sciper: 257844 - 261203
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*/
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package ch.epfl.alpano;
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import java.util.Locale;
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import static java.lang.Math.abs;
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import static java.lang.Math.cos;
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import static java.lang.Math.sin;
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import static java.lang.Math.PI;
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import static java.lang.Math.atan2;
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import static java.lang.Math.sqrt;
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import static java.lang.Math.toDegrees;
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import static ch.epfl.alpano.Preconditions.checkArgument;
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import static ch.epfl.alpano.Math2.haversin;
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import static ch.epfl.alpano.Distance.toMeters;
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import static ch.epfl.alpano.Azimuth.fromMath;
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import static ch.epfl.alpano.Azimuth.canonicalize;
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/**
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* Definition of a geographical point on Earth's surface using spherical
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* coordinates.
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*/
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public class GeoPoint {
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private final double longitude;
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private final double latitude;
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/**
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* Constructor of a GeoPoint
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*
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* @param longitude
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* : longitude position
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* @param latitude
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* : latitude position
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* @throws IllegalArgumentException
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* if longitude is not in [−Pi;Pi] or latitude is not in
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* [−2Pi;2Pi]
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*/
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public GeoPoint(double longitude, double latitude) {
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checkArgument(!(abs(longitude) > PI || abs(latitude) * 2.0 > PI));
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this.longitude = longitude;
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this.latitude = latitude;
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}
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/**
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* Returns the longitude value of the GeoPoint
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*
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* @return longitude
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*/
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public double longitude() {
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return this.longitude;
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}
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/**
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* Returns the latitude value of the GeoPoint
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*
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* @return latitude
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*/
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public double latitude() {
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return this.latitude;
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}
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/**
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* Computes the distance between two points
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*
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* @param that
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* : a GeoPoint
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* @return distance in meters between two points
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*/
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public double distanceTo(GeoPoint that) {
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return toMeters(
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2 * Math.asin(sqrt(haversin(this.latitude - that.latitude)
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+ cos(this.latitude) * cos(that.latitude)
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* haversin(this.longitude - that.longitude))));
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}
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/**
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* Mathematical angular distance from a geoPoint to another
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*
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* @param that
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* @return angle expressed in radian in the mathematical convention
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*/
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private double mathAzimuthTo(GeoPoint that) {
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return atan2(
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(sin(this.longitude - that.longitude) * cos(that.latitude)),
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(cos(this.latitude) * sin(that.latitude)
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- sin(this.latitude) * cos(that.latitude)
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* cos(this.longitude - that.longitude)));
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}
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/**
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* Angular distance from a geoPoint to another in azimuth
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*
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* @param that
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* : a GeoPoint
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* @return angle expressed in radian in the azimuth convention
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*/
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public double azimuthTo(GeoPoint that) {
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return fromMath(canonicalize(mathAzimuthTo(that)));
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}
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/**
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* Redefines the to String method
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*
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* @return a string , [lon,lat], lon and lat being the longitude and
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* latitude values of the GeoPoint
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*/
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@Override
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public String toString() {
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return String.format((Locale) null, "(%.4f,%.4f)",
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toDegrees(this.longitude), toDegrees(this.latitude));
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}
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}
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