#!/usr/bin/env perl

use strict;
use warnings;

use Geo::Ellipsoid;

print "\nUsing Geo::Ellipsoid\n";
my $gel = Geo::Ellipsoid->new(
    ellipsoid => 'WGS84',
    units => 'degrees',
    distance_units => 'meter',
    longitude => 0,
    bearing => 0,
);
my @curlatlon1 = (37.889086, 41.129166);
my @curlatlon2 = (39.668930, 66.993292);

# displacement from 1 to 2
my ($x,$y) = $gel->displacement(@curlatlon1, @curlatlon2);
print "displacement from @curlatlon1 to @curlatlon2 = ($x,$y)\n";
my @newlatlon = $gel->location(@curlatlon1, $x, $y);
print "moving from @curlatlon1 by ($x,$y) gets me to @newlatlon (corre
+ct is @curlatlon2)\n";
print "dist: ".sqrt($x*$x+$y*$y)
    .", bearing: ".180*atan2($y,$x)/3.14." degrees\n";

# from 2 to 1
($x,$y) = $gel->displacement(@curlatlon2, @curlatlon1);
print "displacement from @curlatlon2 to @curlatlon1 = ($x,$y)\n";
@newlatlon = $gel->location(@curlatlon2, $x, $y);
print "moving from @curlatlon2 by ($x,$y) gets me to @newlatlon (corre
+ct is @curlatlon1)\n";
print "dist: ".sqrt($x*$x+$y*$y)
    .", bearing: ".180*atan2($y,$x)/3.14." degrees\n";

use Geo::Calc;
print "\nUsing Geo::Calc\n";
my $cur1 = Geo::Calc->new(lat=>$curlatlon1[0], lon=>$curlatlon1[1]);
my $bear = $cur1->bearing_to({lat=>$curlatlon2[0], lon=>$curlatlon2[1]
+});
my $dist = $cur1->distance_to({lat=>$curlatlon2[0], lon=>$curlatlon2[1
+]});
my $newlatlon = $cur1->destination_point($bear, $dist);
print "from ("
    .$cur1->get_lat().",".$cur1->get_lon()
.") moving by $dist m and $bear degrees got me to ("
    .$newlatlon->{'lat'}.",".$newlatlon->{'lon'}
.")\n";
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