NAME¶
Math::PlanePath::Rows -- points in fixed-width rows
SYNOPSIS¶
use Math::PlanePath::Rows;
my $path = Math::PlanePath::Rows->new (width => 20);
my ($x, $y) = $path->n_to_xy (123);
DESCRIPTION¶
This path is rows of a given fixed width. For example width=7 is
width => 7
3 | 22 23 24 ...
2 | 15 16 17 18 19 20 21
1 | 8 9 10 11 12 13 14
Y=0 | 1 2 3 4 5 6 7
-------------------------------
X=0 1 2 3 4 5 6
N Start¶
The default is to number points starting N=1 as shown above. An optional
"n_start" can give a different start, with the same shape. For
example to start at 0,
n_start => 0, width => 7
3 | 21 22 23 24 ...
2 | 14 15 16 17 18 19 20
1 | 7 8 9 10 11 12 13
Y=0 | 0 1 2 3 4 5 6
-------------------------------
X=0 1 2 3 4 5 6
The only effect is to push the N values around by a constant amount. It might
help match coordinates with something else zero-based.
FUNCTIONS¶
See "FUNCTIONS" in Math::PlanePath for behaviour common to all path
classes.
- "$path = Math::PlanePath::Rows->new (width => $w)"
- "$path = Math::PlanePath::Rows->new (width => $w, n_start =>
$n)"
- Create and return a new path object. A "width" parameter must be
supplied.
- "($x,$y) = $path->n_to_xy ($n)"
- Return the X,Y coordinates of point number $n in the path.
- "$n = $path->xy_to_n ($x,$y)"
- Return the point number for coordinates "$x,$y".
$x and $y are rounded to the nearest integers, which has the effect of
treating each point in the path as a square of side 1, so a column -0.5
<= x < width+0.5 and y>=-0.5 is covered.
- "($n_lo, $n_hi) = $path->rect_to_n_range ($x1,$y1,
$x2,$y2)"
- The returned range is exact, meaning $n_lo and $n_hi are the smallest and
biggest in the rectangle.
SEE ALSO¶
Math::PlanePath, Math::PlanePath::Columns
HOME PAGE¶
<
http://user42.tuxfamily.org/math-planepath/index.html>
LICENSE¶
Copyright 2010, 2011, 2012, 2013, 2014 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/>.