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#!/usr/bin/env perl
###########################################################################
# script name: ch-1.pl #
# #
# https://github.com/user-person #
# #
# https://perlweeklychallenge.org/blog/perl-weekly-challenge-053/ #
# #
# Rotate Matrix #
# Write a script to rotate the followin matrix by given 90/180/270 #
# degrees clockwise. #
# #
# [ 1, 2, 3 ] #
# [ 4, 5, 6 ] #
# [ 7, 8, 9 ] #
# #
# For example, if you rotate by 90 degrees then expected result should #
# be like below #
# #
# [ 7, 4, 1 ] #
# [ 8, 5, 2 ] #
# [ 9, 6, 3 ] #
# #
###########################################################################
use strict;
use warnings;
use diagnostics;
use FindBin;
sub flat {
return map { ref eq 'ARRAY' ? flat(@$_) : $_ } @_;
}
my @matrix = [[1,2,3],
[4,5,6],
[7,8,9]];
#______________________________________
# 0 start | 90 | 180 | 270 |
# 1 [0][0] | [0][2] | [2][2] | [2][0] |
# 2 [0][1] | [1][2] | [2][1] | [1][0] |
# 3 [0][2] | [2][2] | [2][0] | [0][0] |
# 4 [1][0] | [0][1] | [1][2] | [2][1] |
# 5 [1][1] | [1][1] | [1][1] | [1][1] |
# 6 [1][2] | [2][1] | [1][0] | [0][1] |
# 7 [2][0] | [0][0] | [0][2] | [2][2] |
# 8 [2][1] | [1][0] | [0][1] | [1][2] |
# 9 [2][2] | [2][0] | [0][0] | [0][2] |
#__________|________|________|________|
# inner outer
# 0 row 0 + col 0 +
# 90 col 2 - row 0 +
# 180 row 2 - col 2 -
# 270 col 2 - row 0 +
my $width = 0;
my @rawNums = ();
@rawNums = flat @matrix;
for (my $w=1; $w**2 <= scalar @rawNums; ++$w) {
if ($w**2 == scalar @rawNums) {
$width = $w;
}
}
my $deg;
my $errorString = "Invalid choice. There are modes for 0, 90, 180, 270 degree rotations.\n";
if (@ARGV) {
$deg = $ARGV[0];
} else {
print STDERR $FindBin::Script, " requires a command-line argument. There are modes for 0, 90, 180, and 270 degree rotations.\n";
exit(1);
}
if ($deg !~ m{\A[012789]+\Z}) {
print STDERR $errorString;
exit(1);
}
if ( not ($deg == 0 or $deg == 90 or $deg == 180 or $deg == 270)) {
print STDERR $errorString;
exit(1);
}
my @newMatrix = ();
my $i = 0;
if ($deg == 0) {
for (my $j = 0; $j < $width; ++$j) {
for (my $k = 0; $k < $width; ++$k) {
$newMatrix[$j][$k] = $rawNums[$i++];
}
}
} elsif ( $deg == 90 ) {
for (my $j = $width-1; $j >= 0; --$j) {
for (my $k = 0; $k < $width; ++$k) {
$newMatrix[$k][$j] = $rawNums[$i++];
}
}
} elsif ( $deg == 180 ) {
for (my $j = $width-1; $j >= 0; --$j) {
for (my $k = $width-1; $k >= 0; --$k) {
$newMatrix[$j][$k] = $rawNums[$i++];
}
}
} elsif ( $deg == 270 ) {
for (my $j = 0; $j < $width; ++$j) {
for (my $k = $width-1; $k >= 0; --$k) {
$newMatrix[$k][$j] = $rawNums[$i++];
}
}
}
foreach my $row (@newMatrix) {
my $format = 0;
foreach my $element (@$row) {
if ($format == 0) {
print "[", $element, ",";
} elsif ($format == 1) {
print " ", $element, ",";
} elsif ($format == 2) {
print " ", $element, "]";
}
++$format;
}
print "\n";
}
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