[Haskell-cafe] Writing a pnm file

CK Kashyap ck_kashyap at yahoo.com
Sun Aug 2 11:00:56 EDT 2009

Now that I've understood how to generate raster points of a line in Haskell - the next thing I want to do is generate a pnm file with it. I've done it in perl as of now. In perl, I can have a scalar variable $x contain a string of 256*256*3 bytes (for 24-bit 256x256 image) and set pixels using substr on LHS. I was wondering how I could do something similar in Haskell?

sub setPixel{
my$pixel=pack "CCC",$red,$green,$blue;
my$offset=$WIDTH*$y*3 + $x*3;
substr($image,$offset,3) = $pixel;


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