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# 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
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