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

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

9       This is the parent class for all GIS::Distance formula classes such as
10       those listed at "FORMULAS" in GIS::Distance.
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12       To author your own formula class:
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14           package My::Formula;
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16           use parent 'GIS::Distance::Formula';
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18           sub _distance {
19               my ($lat1, $lon1, $lat2, $lon2) = @_;
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21               # ...
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23               return $kilometers;
24           }
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26           1;
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28       Then use it:
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30           my $gis = GIS::Distance->new('My::Formula');
31           my $km = $gis->distance( @coords );
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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.
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38       Much of the interface described in GIS::Distance is actually
39       implemented by this module.
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SUPPORT

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

45       See "AUTHORS" in GIS::Distance.
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48       See "COPYRIGHT AND LICENSE" in GIS::Distance.
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52perl v5.30.1                      2020-01-30       GIS::Distance::Formula(3pm)
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