1Math::PlanePath::File(3U)ser Contributed Perl DocumentatiMoanth::PlanePath::File(3)
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NAME

6       Math::PlanePath::File -- points from a file
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SYNOPSIS

9        use Math::PlanePath::File;
10        my $path = Math::PlanePath::File->new (filename => 'foo.txt');
11        my ($x, $y) = $path->n_to_xy (123);
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DESCRIPTION

14       This path reads X,Y points from a file to present in PlanePath style.
15       It's slightly preliminary yet but is handy to get numbers from
16       elsewhere into a PlanePath program.
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18       The intention is to be flexible about the file format and to auto-
19       detect as far as possible.  Currently the only format is plain text,
20       with an X,Y pair, or N,X,Y triplet on each line
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22           5,6                   # X,Y
23           123  5 6              # N,X,Y
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25       Numbers can be separated by a comma or just spaces and tabs.  Lines not
26       starting with a number are ignored as comments (or blanks).  N values
27       must be integers, but the X,Y values can be fractions like 1.5 too,
28       including exponential floating point 1500.5e-1 etc.
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FUNCTIONS

31       See "FUNCTIONS" in Math::PlanePath for behaviour common to all path
32       classes.
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34       "$path = Math::PlanePath::File->new (filename => "/my/file/name.txt")"
35           Create and return a new path object.
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37       "($x,$y) = $path->n_to_xy ($n)"
38           Return the X,Y coordinates of point number $n on the path.
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40       "$n = $path->xy_to_n ($x,$y)"
41           Return the point number for coordinates "$x,$y".
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43           In the current code an "$x,$y" within a unit circle or square of a
44           point from the file gives that point.  But perhaps in the future
45           some attention could be paid to apparent spacing of points closer
46           than that.
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48       "$bool = $path->x_negative()"
49       "$bool = $path->y_negative()"
50           Return true if there are any negative X or negative Y coordinates
51           in the file.
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53       "$n = $path->n_start()"
54           Return the first N in the path.  For files of just X,Y points the
55           start is N=1, for N,X,Y data it's the first N.
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57       "$str = $path->figure()"
58           Return a string name of the figure (shape) intended to be drawn at
59           each $n position.  In the current code if all X,Y are integers then
60           this is "square", otherwise it's "circle".  But perhaps that will
61           change.
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SEE ALSO

64       Math::PlanePath
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HOME PAGE

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

70       Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020
71       Kevin Ryde
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73       This file is part of Math-PlanePath.
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75       Math-PlanePath is free software; you can redistribute it and/or modify
76       it under the terms of the GNU General Public License as published by
77       the Free Software Foundation; either version 3, or (at your option) any
78       later version.
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80       Math-PlanePath is distributed in the hope that it will be useful, but
81       WITHOUT ANY WARRANTY; without even the implied warranty of
82       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
83       General Public License for more details.
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85       You should have received a copy of the GNU General Public License along
86       with Math-PlanePath.  If not, see <http://www.gnu.org/licenses/>.
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90perl v5.34.0                      2021-07-22          Math::PlanePath::File(3)
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