Prepare for git repository

[spider.git] / perl / DXBearing.pm

diff --git a/perl/DXBearing.pm b/perl/DXBearing.pm
index 798339cbcaf5b231799c8b636e04cbfdc79e32bb..637a6aa889642b33d3a04c3b62656312b3f9e4c2 100644 (file)
--- a/perl/DXBearing.pm
+++ b/perl/DXBearing.pm
@@ -13,61 +13,55 @@
 
 package DXBearing;
 
-use POSIX;
+use DXUtil;
+use POSIX qw(:math_h);
 
 use strict;
 use vars qw($pi);
 
 $pi = 3.14159265358979;
 
-# half a qra to lat long translation
-sub _half_qratoll
-{
-       my ($l, $n, $m) = @_;
-       my $lat = ord($l) - ord('A');
-       $lat = $lat * 10 + (ord($n) - ord('0'));
-       $lat = $lat * 24 + (ord($m) - ord('A'));
-       $lat -= (2160 + 0.5);
-       $lat = $lat * ($pi/4320);
-       
-} 
 # convert a qra locator into lat/long in DEGREES
 sub qratoll
 {
        my $qra = uc shift;
-       my $long = _half_qratoll((unpack 'AAAAAA', $qra)[0,2,4]) * 2;
-       my $lat = _half_qratoll((unpack 'AAAAAA', $qra)[1,3,5]);
-       return (rd($lat), rd($long));
-}
-
-sub _part_lltoqra
-{
-       my ($t, $f, $n, $e) = @_;
-       $n = $f * ($n - int($n));
-       $e = $f * ($e - int($e));
-       my $q = chr($t+$e) . chr($t+$n);
-       return ($q, $n, $e);
+       my ($p1, $p2, $p3, $p4, $p5, $p6) = unpack 'AAAAAA', $qra;
+       ($p1, $p2, $p3, $p4, $p5, $p6) = (ord($p1)-ord('A'), ord($p2)-ord('A'), ord($p3)-ord('0'), ord($p4)-ord('0'), ord($p5)-ord('A'), ord($p6)-ord('A') );
+       
+       my $long = ($p1*20) + ($p3*2) + (($p5+0.5)/12) - 180;
+    my $lat = ($p2*10) + $p4 + (($p6+0.5)/24) - 90;
+       return ($lat, $long);
 }
 
 # convert a lat, long in DEGREES to a qra locator 
 sub lltoqra
 {
-       my $lat = dr(shift);
-       my $long = dr(shift);
-       my $t = 1/6.283185;
+       my $lat = shift;
+       my $long = shift;
 
-       $long = $long * $t +.5 ;
-       $lat = $lat * $t * 2 + .5 ;
+       my $v;
+       my ($p1, $p2, $p3, $p4, $p5, $p6);
+       
+       $lat += 90;
+       $long += 180;
+       $v = int($long / 20); 
+       $long -= ($v * 20);
+       $p1 = chr(ord('A') + $v);
+       $v = int($lat / 10);                       
+       $lat -= ($v * 10);
+       $p2 = chr(ord('A') + $v);
+       $p3 = int($long/2);
+       $p4 = int($lat);
+       $long -= $p3*2;
+       $lat -= $p4;
+       $p3 = chr(ord('0')+$p3);
+       $p4 = chr(ord('0')+$p4);
+       $p5 = int((12 * $long) );
+       $p6 = int((24 * $lat) );
+       $p5 = chr(ord('A')+$p5);
+       $p6 = chr(ord('A')+$p6);
 
-       my $q;
-       my $qq;
-       ($q, $lat, $long) = _part_lltoqra(ord('A'), 18, $lat, $long);
-       $qq = $q;
-       ($q, $lat, $long) = _part_lltoqra(ord('0'), 10, $lat, $long);
-       $qq .= $q;
-       ($q, $lat, $long) = _part_lltoqra(ord('A'), 24, $lat, $long);
-       $qq .= $q;
-       return $qq;
+       return "$p1$p2$p3$p4$p5$p6";
 }
 
 # radians to degrees
@@ -84,13 +78,6 @@ sub dr
        return ($n / 180) * $pi;
 }
 
-# does it look like a qra locator?
-sub is_qra
-{
-       my $qra = shift;
-       return $qra =~ /\a\a\d\d\a\a/o;
-}
-
 # calc bearing and distance, with arguments in DEGREES
 # home lat/long -> lat/long
 # returns bearing (in DEGREES) & distance in KM
@@ -100,16 +87,38 @@ sub bdist
        my $he = dr(shift);
        my $n = dr(shift);
        my $e = dr(shift);
+       return (0, 0) if $hn == $n && $he == $e;
        my $co = cos($he-$e)*cos($hn)*cos($n)+sin($hn)*sin($n);
-       my $ca = atan(abs(sqrt(1-$co*$co)/$co));
+       my $ca = $co ? atan(abs(sqrt(1-$co*$co)/$co)) : $pi;
        $ca = $pi-$ca if $co < 0;
        my $dx = 6367*$ca;
        my $si = sin($e-$he)*cos($n)*cos($hn);
        $co = sin($n)-sin($hn)*cos($ca);
-       my $az = atan(abs($si/$co));
+       my $az = $co ? atan(abs($si/$co)) : $pi;
        $az = $pi - $az if $co < 0;
        $az = -$az if $si < 0;
        $az = $az+2*$pi if $az < 0;
        return (rd($az), $dx);
 }
+
+# turn a lat long string into floating point lat and long
+sub stoll
+{
+       my ($latd, $latm, $latl, $longd, $longm, $longl) = $_[0] =~ /(\d{1,2})\s+(\d{1,2})\s*([NnSs])\s+(1?\d{1,2})\s+(\d{1,2})\s*([EeWw])/;
+       
+       $longd += ($longm/60);
+       $longd = 0-$longd if (uc $longl) eq 'W'; 
+       $latd += ($latm/60);
+       $latd = 0-$latd if (uc $latl) eq 'S';
+       return ($latd, $longd);
+}
+
+# turn a lat and long into a string
+sub lltos
+{
+       my ($lat, $long) = @_;
+       my $slat = slat($lat);
+       my $slong = slong($long);
+       return "$slat $slong";
+}
 1;