#!/usr/bin/perl -w
# Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017 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/>.
use 5.004;
use strict;
use Test;
plan tests => 382;
use lib 't';
use MyTestHelpers;
BEGIN { MyTestHelpers::nowarnings(); }
use Math::PlanePath::KochSquareflakes;
# uncomment this to run the ### lines
#use Devel::Comments;
#------------------------------------------------------------------------------
# VERSION
{
my $want_version = 126;
ok ($Math::PlanePath::KochSquareflakes::VERSION, $want_version,
'VERSION variable');
ok (Math::PlanePath::KochSquareflakes->VERSION, $want_version,
'VERSION class method');
ok (eval { Math::PlanePath::KochSquareflakes->VERSION($want_version); 1 },
1,
"VERSION class check $want_version");
my $check_version = $want_version + 1000;
ok (! eval { Math::PlanePath::KochSquareflakes->VERSION($check_version); 1 },
1,
"VERSION class check $check_version");
my $path = Math::PlanePath::KochSquareflakes->new;
ok ($path->VERSION, $want_version, 'VERSION object method');
ok (eval { $path->VERSION($want_version); 1 },
1,
"VERSION object check $want_version");
ok (! eval { $path->VERSION($check_version); 1 },
1,
"VERSION object check $check_version");
}
#------------------------------------------------------------------------------
# n_start, x_negative, y_negative
{
my $path = Math::PlanePath::KochSquareflakes->new;
ok ($path->n_start, 1, 'n_start()');
ok ($path->x_negative, 1, 'x_negative()');
ok ($path->y_negative, 1, 'y_negative()');
}
#------------------------------------------------------------------------------
# level_to_n_range()
{
my $path = Math::PlanePath::KochSquareflakes->new;
{ my ($n_lo,$n_hi) = $path->level_to_n_range(0);
ok ($n_lo, 1);
ok ($n_hi, 4); }
{ my ($n_lo,$n_hi) = $path->level_to_n_range(1);
ok ($n_lo, 5);
ok ($n_hi, 20); }
{ my ($n_lo,$n_hi) = $path->level_to_n_range(2);
ok ($n_lo, 21);
ok ($n_hi, 84); }
foreach my $level (0 .. 6) {
my ($n_lo,$n_hi) = $path->level_to_n_range($level);
my ($x_lo,$y_lo) = $path->n_to_xy($n_lo);
my ($x_hi,$y_hi) = $path->n_to_xy($n_hi);
my $dx = $x_hi - $x_lo;
my $dy = $y_hi - $y_lo;
ok($dx,0);
ok($dy,1);
}
}
#------------------------------------------------------------------------------
# xy_to_n() coverage
foreach my $inward (0, 1) {
my $path = Math::PlanePath::KochSquareflakes->new (inward => $inward);
foreach my $x (-10 .. 10) {
foreach my $y (-10 .. 10) {
next if $x == 0 && $y == 0;
my $n = $path->xy_to_n ($x, $y);
next if ! defined $n;
### $n
my ($nx,$ny) = $path->n_to_xy ($n);
ok ($nx,$x, "x=$x,y=$y n=$n nxy=$nx,$ny");
ok ($ny,$y);
}
}
}
#------------------------------------------------------------------------------
# Xstart claimed in the POD
foreach my $inward (0, 1) {
my $path = Math::PlanePath::KochSquareflakes->new (inward => $inward);
foreach my $level (0 .. 7) {
my $nstart = (4**($level+1) - 1)/3;
my ($xstart,$ystart) = $path->n_to_xy ($nstart);
ok ($xstart, $ystart);
my $calc_xstart = calc_xstart($level);
ok ($calc_xstart, $xstart);
}
}
sub calc_xstart {
my ($level) = @_;
if ($level == 0) {
return -0.5;
}
if ($level == 1) {
return -2;
}
my $x1 = -0.5;
my $x2 = -2;
foreach (2 .. $level) {
($x1,$x2) = ($x2, 4*$x2 - 2*$x1);
}
return $x2;
}
exit 0;