Each of them would be a map, except you want it to take them two-by-two. Scale is the easiest, since you don't have to worry about that: 
sub scale {
  my ($coords, $factor}
  map { $_ * $factor } @$coords
}

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But a more properly-formed structure would be 
$a_coords = [ [0,0], [0,10], [10,10], [10,0] ]; # a square

[download]
which would be amenable to mapping for all transformations. I think this is a do-it-yourself project, but wouldn't be too surprised to be surprised. :-) Check out Math::Polygon for something in the right ballpark.
Caution: Contents may have been coded under pressure.

In reply to Re: two-dimensional coordinate transformation by Roy Johnson
in thread two-dimensional coordinate transformation by dimar

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