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Re: Storing variable coordinates in a matrix

by davidrw (Prior)
on Mar 15, 2007 at 16:46 UTC ( #605020=note: print w/replies, xml ) Need Help??

in reply to Storing variable coordinates in a matrix

the my @A 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 $y and get back the array calculated for those two values.
sub makeBoxArray { my ($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
To take it a step further, the array can be generated using map to eliminate the repetitive text, and also add optional params for the box size:
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 ; }

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