Creating Combined tikz/png Plots

combine_pm3dmap.pl

#!/usr/bin/perl -w
use strict;
# (c) 2010 Michael Goerz <mail@michaelgoerz.net>
# This code is in the public domain

# Usage:
# combine_pm3dmap.pl infile.tikz infile.png

# replace infile.tikz with "combined" version

my $tikzfile = '';
my $pngfile = '';

if (@ARGV == 2){
    $tikzfile = $ARGV[0];
    $pngfile = $ARGV[1];
} else {
    print "Usage: \n";
    print "  combine_pm3dmap.pl infile.tikz infile.png\n";
}

my $nw = '';
my $sw = '';
my $se = '';
my $ne = '';
my $bottom_color = '';
my $top_color = '';
my $white_color = 'color=\gprgb{1000}{1000}{1000}';
my $bottom2white_box_sw = '';
my $bottom2white_box_ne = '';
my $white2top_box_sw = '';
my $white2top_box_ne = '';

# copy file, get size of drawing area + position/colors of legend (first pass)
open(INFILE, $tikzfile) or die ("Coudn't open $tikzfile for reading\n");
open(OUTFILE, ">$tikzfile~") or die ("Coudn't open $tikzfile~ for writing\n");
#$| = 1; # switch off buffering
my $reached_border = 0;
while(my $line = <INFILE>) {
    print OUTFILE $line;
    chomp $line;
    if ($line eq '\gpsetlinetype{gp_lt_border}'){
        $reached_border = 1;
    }
    if ($reached_border){
        if ($line =~ m'\\draw\[gp path\] \(([0-9.,]+)\)--\(([0-9.,]+)\)--\(([0-9.,]+)\)--\(([0-9.,]+)\)--cycle;'){
            $nw = $1 if ($nw eq '');
            $sw = $2 if ($sw eq '');
            $se = $3 if ($se eq '');
            $ne = $4 if ($ne eq '');
        }
        if ($line =~ m'\\gpfill\{(color=\\gprgb\{1000\}\{1000\}\{1000\})\} (\([0-9.,]+\))--(\([0-9.,]+\))--(\([0-9.,]+\))--(\([0-9.,]+\))--cycle;'){
            # the white box in the middle defines top of bottom2white_box and
            # bottom of white2top_box
            $white2top_box_sw = $2;
            $bottom2white_box_ne = $4;
        } elsif ($line =~ m'\\gpfill\{(color=\\gprgb\{[0-9]+\}\{[0-9]+\}\{[0-9]+\})\} (\([0-9.,]+\))--(\([0-9.,]+\))--(\([0-9.,]+\))--(\([0-9.,]+\))--cycle;'){
            $bottom_color = $1 if ($bottom_color eq '');
            $top_color = $1;
            $bottom2white_box_sw = $2 if ($bottom2white_box_sw eq '');
            $white2top_box_ne = $4; # overwrite each time, final result from last gpfill line
        }
    }
}
close OUTFILE;
close INFILE;

# replace plot commands with png graphic + legend with gradient (second pass)
open(INFILE, "$tikzfile~") or die ("Coudn't open $tikzfile~ for reading\n");
open(OUTFILE, ">$tikzfile") or die ("Coudn't open $tikzfile for writing\n");
my $started_plot = 0;
my $started_legend = 0;
my $finished_plot = 0;
my $finished_legend = 0;
while(my $line = <INFILE>) {
    if ($line =~ m'^\\gpfill'){
        if (not $started_plot){
            $started_plot = 1;
            print OUTFILE "\\node[anchor=north west,inner sep=0pt,outer sep=0pt] at ($nw)\n";
            my $width = 0;
            if ($ne =~ m'([0-9.]+),([0-9.]+)') {
                $width = $1;
            } else {
                die ("ne point '$ne' has unexpected format\n");
            }
            if ($nw =~ m'([0-9.]+),([0-9.]+)') {
                $width = $width - $1;
            } else {
                die ("nw point '$nw' has unexpected format\n");
            }
            my $height = 0;
            if ($nw =~ m'([0-9.]+),([0-9.]+)') {
                $height = $2;
            } else {
                die ("nw point '$nw' has unexpected format\n");
            }
            if ($sw =~ m'([0-9.]+),([0-9.]+)') {
                $height = $height - $2;
            } else {
                die ("sw point '$sw' has unexpected format\n");
            }
            print OUTFILE "  {\\includegraphics[width=${width}cm,height=${height}cm]{$pngfile}};\n";
        }
        if ($finished_plot and not $started_legend){
            $started_legend = 1;
            print OUTFILE "\\shade[bottom $bottom_color,top $white_color] $bottom2white_box_sw rectangle $bottom2white_box_ne;\n";
            print OUTFILE "\\shade[bottom $white_color, top $top_color] $white2top_box_sw rectangle $white2top_box_ne;\n";
        }
    } else {
        $finished_plot = 1 if ($started_plot);
        $finished_legend = 1 if ($started_legend);
    }
    unless (   ($started_plot and not $finished_plot)
            or ($started_legend and not $finished_legend) ) {
        print OUTFILE $line;
    }
}
close OUTFILE;
close INFILE;

unlink "$tikzfile~";