(31) Using non-default fonts in PostScript

This example illustrates several possibilities to create GMT plots with non-default fonts. As these fonts are not part of the standard PostScript font collection they have to be embedded in the PS- or PDF-file with Ghostscript. See also Cookbook Section Using non-default fonts with GMT for further information. The script includes the following steps:

  • create a PSL_custom_fonts.txt file;
  • set the GMT parameters MAP_DEGREE_SYMBOL, PS_CHAR_ENCODING, and FONT;
  • replace the default Helvetica font in the GMT-PostScript-File with sed;
  • create a PostScript-File with outlined fonts (optional);
  • convert GMT’s PostScript output to PDF or any image format (optional).

The script produces the plot in Figure. All standard fonts have been substituted by the free OpenType fonts Linux Libertine (title) and Linux Biolinum (annotations). Uncomment the appropriate lines in the script to make a PostScript-file with outlined fonts or to convert to a PDF-file.

#!/bin/bash
#		GMT EXAMPLE 31
#
# Purpose:	Illustrate usage of non-default fonts in PostScript
# GMT modules:	gmtset, pscoast, psxy, pstext, pslegend
# Unix progs:	gs, awk, cat, rm
#
file=example_31
ps=${file}.ps
ps_outlined=${file}_outlined.ps
eps_outlined=${file}_outlined.eps

# create file PSL_custom_fonts.txt in current working directory
# and add PostScript font names of Linux Biolinum and Libertine
$AWK '{print $1, 0.700, 0}' << EOF > PSL_custom_fonts.txt
LinBiolinumO
LinBiolinumOI
LinBiolinumOB
LinLibertineOB
EOF

# common settings
gmt set FORMAT_GEO_MAP ddd:mm:ssF \
MAP_DEGREE_SYMBOL colon \
MAP_TITLE_OFFSET 20p \
MAP_GRID_CROSS_SIZE_PRIMARY 0.4c \
PS_LINE_JOIN round \
PS_CHAR_ENCODING ISO-8859-5 \
FONT LinBiolinumO \
FONT_TITLE 24p,LinLibertineOB \
MAP_ANNOT_OBLIQUE 42

# map of countries
gmt pscoast -Dl -R-7/31/64/66+r -JL15/50/40/60/16c -P \
	-Bx10g10 -By5g5 -B+t"Europe\072 Countries and Capital Cities" -A250 \
	-Slightblue -Glightgreen -W0.25p -N1/1p,white -K > $ps

# mark capitals
gmt psxy europe-capitals-ru.csv -R -J -i0,1 \
-Sc0.15c -G196/80/80 -O -K >> $ps

# small EU cities
$AWK 'BEGIN {FS=","} $4 !="" && $4 <= 1000000 {print $1, $2}' europe-capitals-ru.csv | \
gmt psxy -R -J -Sc0.15c -W0.25p -O -K >> $ps

# big EU cities
$AWK 'BEGIN {FS=","} $4 > 1000000 {print $1, $2}' europe-capitals-ru.csv | \
gmt psxy -R -J -Sc0.15c -W1.25p -O -K >> $ps

# label big EU cities
$AWK 'BEGIN {FS=","} $4 > 1000000 {print $1, $2, $3}' europe-capitals-ru.csv | \
gmt pstext -R -J -F+f7p,LinBiolinumOI+jBL -Dj0.1c -Gwhite -C5% -Qu -TO -O -K >> $ps

# construct legend
cat << EOF > legend.txt
G -0.1c
H 10 LinBiolinumOB Population of the European Union capital cities
G 0.15c
N 2
S 0.15c c 0.15c 196/80/80 0.25p 0.5c < 1 Million inhabitants
S 0.15c c 0.15c 196/80/80 1.25p 0.5c > 1 Million inhabitants
N 1
G 0.15c
L 8 LinBiolinumOB L Population in Millions 
N 6
EOF

# append city names and population to legend
$AWK 'BEGIN {FS=","; f="L 8 LinBiolinumO L"}
  $4 > 1000000 {printf "%s %s:\n%s %.2f\n", f, $3, f, $4/1e6}' \
  europe-capitals-ru.csv >> legend.txt

# reduce annotation font size for legend
gmt set FONT_ANNOT_PRIMARY 8p

# plot legend
gmt pslegend -R -J -DjTR+o0.1c+w8.0c+l1.2 \
-C0.3c/0.4c -F+p+gwhite -O legend.txt >> $ps

# make a PostScript and a PDF file with outlined fonts
# unfortunately gmt psconvert won't be able to crop that file correctly anymore
# use Heiko Oberdiek's pdfcrop (http://code.google.com/p/pdfcrop2/) instead
# or crop with gmt psconvert -A -Te before
#
# a. remove GMT logo and crop EPS:
#gmt psconvert -P -Au -Te -C-sFONTPATH="${PWD}/fonts" -Fex31CropNoLogo $ps
# b. make PS with outlined fonts:
#gs -q -sPAPERSIZE=a3 -dNOCACHE -dSAFER -dNOPAUSE -dBATCH -dNOPLATFONTS \
#  -sDEVICE=pswrite -sFONTPATH="${PWD}/fonts" -sOutputFile=$ps_outlined ex31CropNoLogo.eps
# c. make croppepd EPS:
#gs -q -dNOCACHE -dSAFER -dNOPAUSE -dBATCH -dEPSCrop -sDEVICE=epswrite \
#  -sOutputFile=$eps_outlined $ps_outlined
# d. make cropped PDF:
#gmt psconvert -P -A -Tf $ps_outlined
# uncomment to do conversation to PDF and PNG
# you will get a PDF with subsetted TrueType/PostScript fonts embedded
# which you can still edit with your favorite vector graphics editor
#export GS_FONTPATH="${PWD}/fonts"
#gmt psconvert -P -A -Tf $ps
#gmt psconvert -P -A -Tg -E110 $ps
# clean up
rm -f gmt.history gmt.conf PSL_custom_fonts.txt legend.txt ex31CropNoLogo.eps

exit 0
../_images/example_31.png

Using non-default fonts in PostScript.