wm/layer2img.py

89 lines
2.6 KiB
Python

#!/usr/bin/python3
import argparse
import geopandas
import psycopg2
import matplotlib.pyplot as plt
from matplotlib import rc
#CMAP = 'Set3'
CMAP = 'tab20c'
INCH = 25.4 # mm
BOUNDS = ('xmin', 'ymin', 'xmax', 'ymax')
BLACK, GREEN, ORANGE, PURPLE = '#000000', '#1b9e77', '#d95f02', '#7570b3'
PSQL_CREDS = "host=127.0.0.1 dbname=osm user=osm password=osm"
def plt_size(string):
if not string:
return None
try:
w, h = string.split("x")
return float(w) / INCH, float(h) / INCH
except Exception as e:
raise argparse.ArgumentTypeError from e
def parse_args():
parser = argparse.ArgumentParser(
description='Convert geopackage to an image')
parser.add_argument('--group1-table')
parser.add_argument('--group1-where')
parser.add_argument('--group1-cmap', type=bool)
parser.add_argument('--group2-table')
parser.add_argument('--group2-where')
parser.add_argument('--group2-cmap', type=bool)
parser.add_argument('--group3-table')
parser.add_argument('--group3-where')
parser.add_argument('--group3-cmap', type=bool)
parser.add_argument('-o', '--outfile', metavar='<file>')
parser.add_argument(
'--size', type=plt_size, help='Figure size in mm (WWxHH)')
parser.add_argument('--clip', type=float, nargs=4, metavar=BOUNDS)
return parser.parse_args()
def read_layer(table, maybe_where=None):
if not table:
return
conn = psycopg2.connect(PSQL_CREDS)
sql = "SELECT way FROM %s" % table
if maybe_where:
sql += " WHERE %s" % maybe_where
return geopandas.read_postgis(sql, con=conn, geom_col='way')
def main():
args = parse_args()
group1 = read_layer(args.group1_table, args.group1_where)
group2 = read_layer(args.group2_table, args.group2_where)
group3 = read_layer(args.group3_table, args.group3_where)
c1 = {'cmap': CMAP} if args.group1_cmap else {'color': BLACK}
c2 = {'cmap': CMAP} if args.group2_cmap else {'color': ORANGE}
c3 = {'cmap': CMAP} if args.group3_cmap else {'color': GREEN}
rc('text', usetex=True)
fig, ax = plt.subplots()
if args.size:
fig.set_size_inches(args.size)
if c := args.clip:
ax.set_xlim(left=c[0], right=c[2])
ax.set_ylim(bottom=c[1], top=c[3])
group1 is not None and group1.plot(ax=ax, **c1)
group2 is not None and group2.plot(ax=ax, **c2)
group3 is not None and group3.plot(ax=ax, **c3)
ax.axis('off')
ax.margins(0, 0)
if args.outfile:
fig.savefig(args.outfile, bbox_inches='tight', dpi=600)
else:
plt.show()
if __name__ == '__main__':
main()