eq2eps

#!/bin/bash
set -e   # exit on error 

# Convert equation into eps with high-resolution preview image so that
#   - eps figure has the right size.
#   - figure's preview image can be upscaled quite a bit, if necessary.
#   - can be used with openoffice,powerpoint which use only the preview image instead of the actual eps content.
#
# Example: eq2eps "x^2" out # generates out.eps
#
# Use instead eq2png when transparent background is neeeded.
# Problem: 
# In open-office, eps files are not rendered, instead their embedded preview images are rendered.
# However, even though preview file contains transparent background, it is set to "white" in open office!
# I've also tried to manual add transparent tiff as preview (epstool --add-user-preview x.tif x.eps xuser.eps)
# epstool does exactly what I want: gets the image and fixes its size to the one defined by eps file, which 
# is in inches, instead of pixels (as in png). However, it is the open-office bug that doesn't handle transparent
# backgrounds.
#
# I've confirmed that the output size is exactly correct.
#
# Gokberk Cinbis, June 2012

if [ $# -ne 2 ]
then
    eq2help
    return 1
fi

# temporary file
xfile=`mktemp -u`
xdir=`dirname "$xfile"`
if [ -z "$xfile" ]; # unset or empty
then
    echo "ERROR tempfile failed"
    exit 1 
fi

# create latex file
# we have to quote to avoid expansion if arguments have spaces
eq2tex "$1" "$xfile"

# -- this fails whenever the output is scaled with pgfpagesuselayout --
#latex -output-directory="$xdir" "$xfile.tex"
## -D does not change the ps file size or geometry. I don't know if it has any effect in our case!
#dvips -q -Z -D 600 -E "$xfile.dvi" -o "$xfile.ps"
## epstool didn't work well on the output of ps2eps or ps2epsi:
##   ps2eps -P "$xfile.ps"
##   ps2epsi "$xfile.ps" "$xfile.epsi"
## dpi does not change the size of the figure. instead it embeds a higher-res image at the same size,
## which can be useful if the output will be enlargened.
#epstool --dpi 600 -t6p "$xfile.ps" "$xfile.eps2"

pdflatex -output-directory="$xdir" "$xfile.tex"
pdfcrop --nodebug --noverbose "$xfile".pdf "$xfile"2.pdf
pdftops -eps "$xfile"2.pdf $xfile.ps

# dpi 600
# --gs-args "-dTextAlphaBits=4 -dGraphicsAlphaBits=4"
epstool --dpi 600 -t6p "$xfile.ps" "$xfile.eps2"

# copy
/bin/mv -f "$xfile.eps2" "$2.eps"

# cleanup
rm -f "$xfile"
rm -f "$xfile".log
rm -f "$xfile".aux
rm -f "$xfile".tex
rm -f "$xfile".dvi
rm -f "$xfile".ps
rm -f "$xfile".pdf
rm -f "$xfile"2.pdf
rm -f "$xfile".eps*