1GIS::Distance::Formula(U3spemr)Contributed Perl DocumentGaItSi:o:nDistance::Formula(3pm)
2
3
4

NAME

6       GIS::Distance::Formula - Formula base class.
7

DESCRIPTION

9       This is the parent class for all GIS::Distance formula classes such as
10       those listed at "FORMULAS" in GIS::Distance.
11
12       To author your own formula class:
13
14           package My::Formula;
15
16           use parent 'GIS::Distance::Formula';
17
18           sub _distance {
19               my ($lat1, $lon1, $lat2, $lon2) = @_;
20
21               # ...
22
23               return $kilometers;
24           }
25
26           1;
27
28       Then use it:
29
30           my $gis = GIS::Distance->new('My::Formula');
31           my $km = $gis->distance( @coords );
32
33       The global $GIS::Distance::Formula::SELF is available when your
34       "_distance()" subroutine is called if, and only if, the entry point was
35       "distance" in GIS::Distance and NOT "distance_metal" in GIS::Distance
36       or otherwise.
37
38       Much of the interface described in GIS::Distance is actually
39       implemented by this module.
40

SUPPORT

42       See "SUPPORT" in GIS::Distance.
43

AUTHORS

45       See "AUTHORS" in GIS::Distance.
46

LICENSE

48       See "LICENSE" in GIS::Distance.
49
50
51
52perl v5.34.0                      2021-07-22       GIS::Distance::Formula(3pm)