for ($x=0;$x<16;$x++) { $abs00=sqrt(($x*$x)+($y*$y)); if ($abs00>16) $abs00=16;
$abs01=sqrt(($x*$x)+((16-$y)*(16-$y))); if ($abs01>16) $abs01=16;
$abs10=sqrt(((16-$x)*(16-$x))+($y*$y)); if ($abs10>16) $abs10=16;
$red=((16-$abs00)*16)-1; if ($red<0) $red=0;
$green=((16-$abs01)*16)-1; if ($green<0) $green=0; $blue= ((16-$abs10)*16)-1; if ($blue<0) $blue=0;
$col = sprintf("%02x%02x%02x",$red,$green,$blue); echo "
echo "