# How to generate new scale bar thumbnail
# =======================================
# Expects North Carolina dataset. The thumbnail height should be 24 px.
# The expected scale bar with is 101 (no more than 110).


export GRASS_RENDER_IMMEDIATE=png
export GRASS_RENDER_TRUECOLOR=TRUE
export GRASS_RENDER_WIDTH=300
export GRASS_RENDER_HEIGHT=300
g.region raster=elevation

for STYLE in classic line solid hollow full_checker part_checker mixed_checker tail_checker up_ticks down_ticks both_ticks arrow_ends
do
	echo ${STYLE}
	export GRASS_RENDER_FILE=${STYLE}.png
	d.barscale -t style=${STYLE} at=20,20 segment=5
	mogrify -trim ${STYLE}.png
	identify -format "%[fx:w]x%[fx:h]" ${STYLE}.png
	convert ${STYLE}.png -gravity center -background white -extent 110x24  ${STYLE}.png
	optipng -o5 ${STYLE}.png ${STYLE}.png --quiet
done
