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a guest Apr 25th, 2019 74 Never
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  1. public class Town {
  2.     final int  id;
  3.     final String  name;
  4.     final double  x,y;
  5.     private static final double R= 6378.1370D;
  6.     private static final double CONVERT_DEGREE_TO_RADIANS = Math.PI/180D;
  7.     public Town(int id, String name, double x, double y) {
  8.         this.id = id;
  9.         this.name = name;
  10.         this.x = x*CONVERT_DEGREE_TO_RADIANS;
  11.         this.y = y*CONVERT_DEGREE_TO_RADIANS;
  12.     }
  13.     //distanza dal monumento al monumento inserito
  14.    
  15.     public double distanceTo(Town b){
  16.         double deltaLat = (b.x - this.x);
  17.         double deltaLon = (b.y-this.y);
  18.          double a = Math.sin(deltaLat / 2) * Math.sin(deltaLat / 2)
  19.                     + Math.cos(this.x) * Math.cos(b.x)
  20.                     * Math.sin(deltaLon / 2) * Math.sin(deltaLon / 2);
  21.          double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
  22.  
  23.          double distance = R * c * 1000;
  24.          
  25.          return Math.sqrt(distance);
  26.            
  27.     }
  28.    
  29.    
  30.  
  31. }
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