# This is in dots per inch.
SCREEN_RESOLUTION = 72

# Minimum version that will work is 2.00.  The version in Fedora 13
# is ancient, so we have to download it.
PGF_VERSION = 2.00

# Note this must be EXACTLY as written below:
export TEXINPUTS := .:$(shell pwd)/pgf-$(PGF_VERSION)//:

FIGURES = \
	diskimg.png \
	example.png \
	vm.png

all: $(FIGURES)

# Generate PNG file from source TikZ/LaTeX file:
%.png: %.pdf
	gs -dNOPAUSE -dBATCH \
	  -sDEVICE=png16m -r$(SCREEN_RESOLUTION) \
	  -dGraphicsAlphaBits=4 -dTextAlphaBits=4 \
	  -sOutputFile=$@ $<
%.pdf: %.tex pgf-$(PGF_VERSION)/ls-R
	pdflatex $<

# Download pgf/tikz from upstream.
PGF_SOURCE_URL = http://downloads.sourceforge.net/project/pgf/pgf/version%20$(PGF_VERSION)/pgf-$(PGF_VERSION).tar.gz

pgf-$(PGF_VERSION)/ls-R: pgf-$(PGF_VERSION)
	texhash pgf-$(PGF_VERSION)

pgf-$(PGF_VERSION): pgf-$(PGF_VERSION).tar.gz
	zcat $< | tar xf -

pgf-$(PGF_VERSION).tar.gz:
	wget -O "$@" "$(PGF_SOURCE_URL)"