#!/usr/bin/perl
# Perl script to change the colors in the Postscript files output
# by gnuplot (for example when using octave).
# Because there is no corresponding terminal option (as for example
# with terminal png) to set up the colors, this Perl script is used.
#
# Alexander Klink <address@hidden> 2005, public domain
#
# Usage: set the $linecolor0 to $linecolor8 variables below to fit
# your taste (values from 0 to 1 in RGB are used here) and run
# gnuplot_ps_colorchange <postscriptfile.eps>
# The script will then output the changed file into <postscriptfile_colorchanged.eps>

$linecolorb = "0 0 0";
$linecolora = "0 0 0";
$linecolor0 = "1 0 0";
$linecolor1 = "0 1 0";
$linecolor2 = "0 0 1";
$linecolor3 = "1 0 1";
$linecolor4 = "0 1 1";
$linecolor5 = "1 1 0";
$linecolor6 = "0 0 0";
$linecolor7 = "1 0.3 0";
$linecolor8 = "0.5 0.5 0.5";

### You should not need to change anything below this line ###

$outfilename = $ARGV[0];
$outfilename =~ s/\.eps$/_colorchanged\.eps/;

open(PS, "<$ARGV[0]") || die('Could not open input file.');
open(OUT, ">$outfilename") || die('Could not open output file.');

while (<PS>) { # read in file
	if (/^\/LT/) { # the line starts with /LT
		# color substitutions
		s/\/LTb { BL \[\] 0 0 0 DL } def/\/LTb { BL \[\] $linecolorb DL } def/;
		s/\/LTa { AL \[1 udl mul 2 udl mul\] 0 setdash 0 0 0 setrgbcolor } def/\/LTa { AL \[1 udl mul 2 udl mul\] 0 setdash $linecolora setrgbcolor } def/;
		s/\/LT0 { PL \[\] 1 0 0 DL } def/\/LT0 { PL \[\] $linecolor0 DL } def/;
		s/\/LT1 { PL \[4 dl 2 dl\] 0 1 0 DL } def/\/LT1 { PL \[4 dl 2 dl\] $linecolor1 DL } def/;
		s/\/LT2 { PL \[2 dl 3 dl\] 0 0 1 DL } def/\/LT2 { PL \[2 dl 3 dl\] $linecolor2 DL } def/;
		s/\/LT3 { PL \[1 dl 1.5 dl\] 1 0 1 DL } def/\/LT3 { PL \[1 dl 1.5 dl\] $linecolor3 DL } def/;
		s/\/LT4 { PL \[5 dl 2 dl 1 dl 2 dl\] 0 1 1 DL } def/\/LT4 { PL \[5 dl 2 dl 1 dl 2 dl\] $linecolor4 DL } def/;
		s/\/LT5 { PL \[4 dl 3 dl 1 dl 3 dl\] 1 1 0 DL } def/\/LT5 { PL \[4 dl 3 dl 1 dl 3 dl\] $linecolor5 DL } def/;
		s/\/LT6 { PL \[2 dl 2 dl 2 dl 4 dl\] 0 0 0 DL } def/\/LT6 { PL \[2 dl 2 dl 2 dl 4 dl\] $linecolor6 DL } def/;
		s/\/LT7 { PL \[2 dl 2 dl 2 dl 2 dl 2 dl 4 dl\] 1 0.3 0 DL } def/\/LT7 { PL \[2 dl 2 dl 2 dl 2 dl 2 dl 4 dl\] $linecolor7 DL } def/;
		s/\/LT8 { PL \[2 dl 2 dl 2 dl 2 dl 2 dl 2 dl 2 dl 4 dl\] 0.5 0.5 0.5 DL } def/\/LT8 { PL \[2 dl 2 dl 2 dl 2 dl 2 dl 2 dl 2 dl 4 dl\] $linecolor8 DL } def/;
	}
	print OUT $_;
}
close(PS);
close(OUT);