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#!/usr/bin/env bash
#
# Make an illustration of grid chunking
#
gmt begin GMT_chunking
gmt set GMT_THEME cookbook
gmt set MAP_FRAME_PEN thick FONT_ANNOT_PRIMARY 9p
n=1 # current cell number
for ((x=0;x<12;++x)); do
# x: number of chunk
for ((j=2;j>=0;--j)); do
# j: y-coordinate in each chunk
for ((i=0;i<3;++i)); do
# i: x-coordinate in each chunk
echo "$i $j $((n++))"
done
done > chunk.tmp
# plot chunks
if [ $x -eq 0 ]; then
# first chunk
gmt text chunk.tmp -R-0.5/2.5/-0.5/2.5 -Bg1+0.5 -JX2c/0 -Y10c
elif [ $x -eq 4 -o $x -eq 8 ]; then
# new chunk row
gmt text chunk.tmp -B+glightblue -Bg1+0.5 -X-6.3c -Y-2.1c
elif [ $x -eq 5 -o $x -eq 9 -o $x -eq 10 ]; then
# colored chunks
gmt text chunk.tmp -B+glightblue -Bg1+0.5 -X2.1c
else
gmt text chunk.tmp -Bg1+0.5 -X2.1c
fi
done
rm -f chunk.tmp
gmt end show
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