79 lines
2.1 KiB
Python
Executable File
79 lines
2.1 KiB
Python
Executable File
#!/usr/bin/python3
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# https://gis.stackexchange.com/questions/131716/plot-shapefile-with-matplotlib
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import argparse
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import geopandas
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import psycopg2
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import matplotlib.pyplot as plt
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from matplotlib import rc, patches
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INCH = 25.4 # mm
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BOUNDS = ('xmin', 'ymin', 'xmax', 'ymax')
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def plt_size(string):
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if not string:
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return None
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try:
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w, h = string.split("x")
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return float(w) / INCH, float(h) / INCH
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except Exception as e:
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raise argparse.ArgumentTypeError from e
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def parse_args():
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parser = argparse.ArgumentParser(
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description='Convert geopackage to an image')
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ingroup = parser.add_mutually_exclusive_group(required=True)
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ingroup.add_argument('--infile')
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ingroup.add_argument('--table')
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parser.add_argument('-o', '--outfile', metavar='<file>')
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parser.add_argument(
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'--size', type=plt_size, help='Figure size in mm (WWxHH)')
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parser.add_argument( '--clip', type=float, nargs=4, metavar=BOUNDS)
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overlay = parser.add_mutually_exclusive_group()
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overlay.add_argument('--overlay-infile', type=str)
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overlay.add_argument('--overlay-table', type=str)
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return parser.parse_args()
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def read_layer(maybe_table, maybe_file):
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if maybe_table:
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conn = psycopg2.connect("host=127.0.0.1 dbname=osm user=osm")
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sql = "SELECT geom FROM %s" % maybe_table
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return geopandas.read_postgis(sql, con=conn, geom_col='geom')
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elif maybe_file:
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return geopandas.read_file(maybe_file)
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def main():
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args = parse_args()
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primary = read_layer(args.table, args.infile)
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overlay = read_layer(args.overlay_table, args.overlay_infile)
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rc('text', usetex=True)
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fig, ax = plt.subplots()
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if args.size:
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fig.set_size_inches(args.size)
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primary.plot(ax=ax)
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if c := args.clip:
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ax.set_xlim(left=c[0], right=c[2])
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ax.set_ylim(bottom=c[1], top=c[3])
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if overlay is not None:
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overlay.plot(ax=ax)
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ax.axis('off')
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ax.margins(0, 0)
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fig.tight_layout(0)
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if args.outfile:
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fig.savefig(args.outfile, bbox_inches=0, dpi=600)
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else:
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plt.show()
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if __name__ == '__main__':
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main()
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