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#!/usr/bin/env python3
#
# thumbnails.py: Create thumbnail images of the GRASS color tables
#
# AUTHOR: Vaclav Petras (non-PPM version using r.mapcalc)
# Glynn Clements (Python version)
# Earlier Bourne script version by Hamish Bowman,
# https://grasswiki.osgeo.org/wiki/Talk:Color_tables
#
# (C) 2009-2017 by the GRASS Development Team
# This program is free software under the GNU General Public
# License (>=v2). Read the file COPYING that comes with GRASS
# for details.
#
import os
import atexit
import grass.script as grass
tmp_grad_abs = None
tmp_grad_rel = None
def cleanup():
if tmp_grad_rel:
grass.run_command(
"g.remove", flags="f", type="raster", name=tmp_grad_rel, quiet=True
)
if tmp_grad_abs:
grass.run_command(
"g.remove", flags="f", type="raster", name=tmp_grad_abs, quiet=True
)
def make_gradient(path):
fh = open(path)
text = fh.read()
fh.close()
lines = text.splitlines()
records = list()
for line in lines:
if line.startswith("#"):
# skip comments
continue
if len(line) == 0:
# skip empty lines
continue
records.append(line.split())
records = [
record for record in records if record[0] != "nv" and record[0] != "default"
]
relative = False
absolute = False
for record in records:
if record[0].endswith("%"):
relative = True
record[0] = record[0].rstrip("%")
else:
absolute = True
if absolute:
if relative:
minval = -0.04
maxval = 0.04
else:
minval = float(records[0][0])
# shift min up for floating point values so that
# first color in color table is visible
if "." in records[0][0]:
# assumes that 1% of min does not go to the next value
# and is still represented as float and does not make
# too much difference in color
# works better than 1% of the difference to the next value
minval += abs(minval / 100)
maxval = float(records[-1][0])
maxval = min(maxval, 2500000)
if os.path.basename(path) in ("ndvi", "ndwi", "ndwi2"):
minval = -1.0
maxval = 1.0
if os.path.basename(path) == "ndvi_MODIS":
minval = -10000.0
maxval = 10000.0
if os.path.basename(path) == "population_dens":
maxval = 1000.0
if os.path.basename(path) == "precipitation":
maxval = 2000.0
if os.path.basename(path) in ("terrain", "srtm", "srtm_plus"):
minval = -500.0
maxval = 3000.0
grad = tmp_grad_abs
grass.mapcalc(
"$grad = "
" float($min) + (col() - 1) * "
" (float($max) - float($min)) / ncols()",
grad=tmp_grad_abs,
min=minval,
max=maxval,
quiet=True,
)
else:
grad = tmp_grad_rel
return grad
def make_image(output_dir, table, grad, height, width):
outfile = os.path.join(output_dir, "colortables", "%s.png" % table)
os.environ["GRASS_RENDER_FILE"] = outfile
grass.run_command("r.colors", map=grad, color=table, quiet=True)
os.environ["GRASS_RENDER_FRAME"] = "%f,%f,%f,%f" % (0, height, 2, width - 2)
grass.run_command("d.rast", map=grad, quiet=True)
if 1:
os.environ["GRASS_RENDER_FRAME"] = "%f,%f,%f,%f" % (0, height, 0, width)
grass.write_command(
"d.graph",
quiet=True,
flags="m",
stdin="""
width 1
color {outcolor}
polyline
{x1} {y1}
{x2} {y1}
{x2} {y2}
{x1} {y2}
{x1} {y1}
color {incolor}
polyline
{x3} {y3}
{x4} {y3}
{x4} {y4}
{x3} {y4}
{x3} {y3}
""".format(
x1=1,
x2=width,
y1=0,
y2=height - 1,
x3=2,
x4=width - 1,
y3=1,
y4=height - 2,
outcolor="white",
incolor="black",
),
)
def main():
global tmp_img, tmp_grad_abs, tmp_grad_rel
height = 15
width = 85
os.environ["GRASS_OVERWRITE"] = "1"
color_dir = os.path.join(os.environ["GISBASE"], "etc", "colors")
output_dir = os.path.join(os.environ["GISBASE"], "docs", "html")
if not os.path.exists(output_dir):
os.makedirs(output_dir)
pid = os.getpid()
tmp_grad_abs = "tmp_grad_abs_%d" % pid
tmp_grad_rel = "tmp_grad_rel_%d" % pid
os.environ["GRASS_RENDER_WIDTH"] = "%d" % width
os.environ["GRASS_RENDER_HEIGHT"] = "%d" % height
os.environ["GRASS_RENDER_TRUECOLOR"] = "TRUE"
# for multiple d commands (requires to delete/move image each time)
os.environ["GRASS_RENDER_FILE_READ"] = "TRUE"
os.environ["GRASS_RENDER_FILE_MAPPED"] = "FALSE"
os.environ["GRASS_RENDER_TRANSPARENT"] = "FALSE"
os.environ["GRASS_RENDER_BACKGROUNDCOLOR"] = "ffffff"
os.environ["GRASS_RENDER_IMMEDIATE"] = "cairo"
# for one pixel wide lines
os.environ["GRASS_RENDER_ANTIALIAS"] = "none"
for var in ["GRASS_RENDER_LINE_WIDTH"]:
if var in os.environ:
del os.environ[var]
os.environ["GRASS_ANTIALIAS"] = "none"
grass.use_temp_region()
grass.run_command(
"g.region",
s=0,
w=0,
n=height,
e=width,
rows=height,
cols=width,
res=1,
flags="a",
)
grass.mapcalc("$grad = float(col())", grad=tmp_grad_rel, quiet=True)
for table in os.listdir(color_dir):
path = os.path.join(color_dir, table)
grad = make_gradient(path)
make_image(output_dir, table, grad, height=height, width=width)
grass.mapcalc("$grad = col()", grad=tmp_grad_abs, quiet=True)
for table in ["grey.eq", "grey.log", "random"]:
make_image(output_dir, table, tmp_grad_abs, height=height, width=width)
if __name__ == "__main__":
atexit.register(cleanup)
main()
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