NAME

       Math::PlanePath::Base::Generic -- various path helpers

SYNOPSIS

        use Math::PlanePath::Base::Generic 'round_nearest';
        $x = round_nearest($x);

DESCRIPTION

       This is a few generic helper functions for the PlanePath code.  They're designed to work
       on plain Perl integers and floats and in some cases there's some special support for
       "Math::BigInt".

EXPORTS

       Nothing is exported by default but each function below can be as in the usual Exporter
       style,

           use Math::PlanePath::Base::Generic 'round_nearest';

       (But not "parameter_info_nstart0()" and "parameter_info_nstart1()", for the reason
       described below.)

FUNCTIONS

   Generic
       "$x = round_nearest ($x)"
           Return $x rounded to the nearest integer.  If $x is half way, such as 2.5 then it's
           round upwards to 3.

              $x = round_nearest($x);

       "$href = Math::PlanePath::Base::Generic::parameter_info_nstart0()"
       "$href = Math::PlanePath::Base::Generic::parameter_info_nstart1()"
           Return an "n_start" parameter hashref suitable for use in a "parameter_info_array()",
           with default either 0 or 1.  For example,

               # alone
               package Math::PlanePath::MySubclass;
               use constant parameter_info_array =>
                 [ Math::PlanePath::Base::Generic::parameter_info_nstart1() ];

               # or with other parameters too
               package Math::PlanePath::MySubclass;
               use constant parameter_info_array =>
                 [
                  { name            => 'something',
                    type            => 'integer',
                    default         => '123',
                  },
                  Math::PlanePath::Base::Generic::parameter_info_nstart1(),
                 ];

           This function is not exportable since it's meant for a one-off call in an initializer
           and so no need to import it for repeated use.

SEE ALSO

       Math::PlanePath, Math::PlanePath::Base::Digits, Math::PlanePath::Base::NSEW

HOME PAGE

       <http://user42.tuxfamily.org/math-planepath/index.html>

LICENSE

       Copyright 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Kevin
       Ryde

       This file is part of Math-PlanePath.

       Math-PlanePath is free software; you can redistribute it and/or modify it under the terms
       of the GNU General Public License as published by the Free Software Foundation; either
       version 3, or (at your option) any later version.

       Math-PlanePath is distributed in the hope that it will be useful, but WITHOUT ANY
       WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
       PURPOSE.  See the GNU General Public License for more details.

       You should have received a copy of the GNU General Public License along with Math-
       PlanePath.  If not, see <http://www.gnu.org/licenses/>.