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[spider.git] / perl / DXBearing.pm

diff --git a/perl/DXBearing.pm b/perl/DXBearing.pm
index e0e9910f95ca4cb89832e15f8976f9f139d04b83..db6f4686d0a75ed89c32e0c32e28509ae233bb5a 100644 (file)
--- a/perl/DXBearing.pm
+++ b/perl/DXBearing.pm
@@ -8,25 +8,19 @@
 #
 # Copyright (c) 1998 - Dirk Koopman G1TLH
 #
-# $Id$
+#
 #
 
 package DXBearing;
 
-use POSIX;
 use DXUtil;
+use POSIX qw(:math_h);
 
 use strict;
 use vars qw($pi);
 
 $pi = 3.14159265358979;
 
-use vars qw($VERSION $BRANCH);
-$VERSION = sprintf( "%d.%03d", q$Revision$ =~ /(\d+)\.(\d+)/ );
-$BRANCH = sprintf( "%d.%03d", q$Revision$ =~ /\d+\.\d+\.(\d+)\.(\d+)/  || (0,0));
-$main::build += $VERSION;
-$main::branch += $BRANCH;
-
 # convert a qra locator into lat/long in DEGREES
 sub qratoll
 {
@@ -107,6 +101,20 @@ sub bdist
        return (rd($az), $dx);
 }
 
+# just the distance - parameters as above
+sub distance
+{
+       my $hn = dr(shift);
+       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 = $co ? atan(abs(sqrt(1-$co*$co)/$co)) : $pi;
+       $ca = $pi-$ca if $co < 0;
+       my $dx = 6367*$ca;
+}
+
 # turn a lat long string into floating point lat and long
 sub stoll
 {