1Math::PlanePath::ColumnUss(e3r)Contributed Perl DocumentMaattiho:n:PlanePath::Columns(3)
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NAME

6       Math::PlanePath::Columns -- points in fixed-height columns
7

SYNOPSIS

9        use Math::PlanePath::Columns;
10        my $path = Math::PlanePath::Columns->new;
11        my ($x, $y) = $path->n_to_xy (123);
12

DESCRIPTION

14       This path is columns of a given fixed height.  For example height 5
15       would be
16
17                |
18             4  |   5  10  15  20        <---  height==5
19             3  |   4   9  14  19
20             2  |   3   8  13  18
21             1  |   2   7  12  17  ...
22           Y=0  |   1   6  11  16  21
23                 ----------------------
24                  X=0   1   2   3   4  ...
25
26   N Start
27       The default is to number points starting N=1 as shown above.  An
28       optional "n_start" can give a different start, with the same shape.
29       For example to start at 0,
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31           n_start => 0, height => 5
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33             4  |   4   9  14  19
34             3  |   3   8  13  18
35             2  |   2   7  12  17
36             1  |   1   6  11  16  ...
37           Y=0  |   0   5  10  15  20
38                 ----------------------
39                  X=0   1   2   3   4  ...
40
41       The only effect is to push the N values around by a constant amount.
42       It might help match coordinates with something else zero-based.
43

FUNCTIONS

45       See "FUNCTIONS" in Math::PlanePath for behaviour common to all path
46       classes.
47
48       "$path = Math::PlanePath::Columns->new (height => $h)"
49       "$path = Math::PlanePath::Columns->new (height => $h, n_start => $n)"
50           Create and return a new path object.  A "height" parameter must be
51           supplied.
52
53       "($x,$y) = $path->n_to_xy ($n)"
54           Return the X,Y coordinates of point number $n in the path.
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56       "$n = $path->xy_to_n ($x,$y)"
57           Return the point number for coordinates "$x,$y".
58
59           $x and $y are rounded to the nearest integers, which has the effect
60           of treating each point in the path as a square of side 1, so a
61           rectangle $x >= -0.5 and -0.5 <= y < height+0.5 is covered.
62
63       "($n_lo, $n_hi) = $path->rect_to_n_range ($x1,$y1, $x2,$y2)"
64           The returned range is exact, meaning $n_lo and $n_hi are the
65           smallest and biggest in the rectangle.
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SEE ALSO

68       Math::PlanePath, Math::PlanePath::Rows, Math::PlanePath::CoprimeColumns
69

HOME PAGE

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

74       Copyright 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 Kevin
75       Ryde
76
77       This file is part of Math-PlanePath.
78
79       Math-PlanePath is free software; you can redistribute it and/or modify
80       it under the terms of the GNU General Public License as published by
81       the Free Software Foundation; either version 3, or (at your option) any
82       later version.
83
84       Math-PlanePath is distributed in the hope that it will be useful, but
85       WITHOUT ANY WARRANTY; without even the implied warranty of
86       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
87       General Public License for more details.
88
89       You should have received a copy of the GNU General Public License along
90       with Math-PlanePath.  If not, see <http://www.gnu.org/licenses/>.
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94perl v5.30.1                      2020-01-30       Math::PlanePath::Columns(3)
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