note
davidrw
the <c>my @A</c> assignment uses the values of $x and $y at that time, and then you get an AoA of static numbers .. changing $x and $y after the fact will have no effect. I believe what you're looking for is a function, so you can pass in $x and $y and get back the array calculated for those two values.
<code>
sub makeBoxArray {
my ($x, $y) = @_;
return (
[ ([$x, $y ]), ([$x+1, $y ]), ([$x+2, $y ]), ([$x+3, $y ]) ],
[ ([$x, $y+1]), ([$x+1, $y+1]), ([$x+2, $y+1]), ([$x+3, $y+1]) ],
[ ([$x, $y+2]), ([$x+1, $y+2]), ([$x+2, $y+2]), ([$x+3, $y+2]) ],
[ ([$x, $y+3]), ([$x+1, $y+3]), ([$x+2, $y+3]), ([$x+3, $y+3]) ],
);
}
my @A = makeBoxArray( 5, 10 );
# use @A for something
@A = makeBoxArray( 7, 2 );
# use @A for something
</code>
To take it a step further, the array can be generated using <c>map</c> to eliminate the repetitive text, and also add optional params for the box size:
<code>
sub makeBoxArray {
my $left = shift;
my $top = shift;
my $width = shift || 4;
my $height = shift || 4;
return map {
my $y = $_;
[ map { [$left+$_, $top+$y] } 0 .. $width-1 ]
} 0 .. $height-1 ;
}
</code>
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