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# Copyright (c) 2008-2015 MetPy Developers. |
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# Distributed under the terms of the BSD 3-Clause License. |
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# SPDX-License-Identifier: BSD-3-Clause |
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"""Tests for the `ctables` module.""" |
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import os.path |
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import tempfile |
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try: |
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from StringIO import StringIO |
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buffer_args = dict(bufsize=0) |
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except ImportError: |
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from io import StringIO |
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buffer_args = dict(buffering=1) |
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import numpy as np |
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import pytest |
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from metpy.plots.ctables import ColortableRegistry, convert_gempak_table |
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@pytest.fixture() |
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def registry(): |
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"""Set up a registry for use by the tests.""" |
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return ColortableRegistry() |
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def test_package_resource(registry): |
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"""Test registry scanning package resource.""" |
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registry.scan_resource('metpy.plots', 'nexrad_tables') |
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assert 'cc_table' in registry |
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def test_scan_dir(registry): |
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"""Test registry scanning a directory and ignoring files it can't handle .""" |
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try: |
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kwargs = dict(mode='w', dir='.', suffix='.tbl', delete=False, **buffer_args) |
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with tempfile.NamedTemporaryFile(**kwargs) as fobj: |
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fobj.write('"red"\n"lime"\n"blue"\n') |
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fname = fobj.name |
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# Unrelated table file that *should not* impact the scan |
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with tempfile.NamedTemporaryFile(**kwargs) as fobj: |
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fobj.write('PADK 704540 ADAK NAS\n') |
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bad_file = fobj.name |
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# Needs to be outside with so it's closed on windows |
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registry.scan_dir(os.path.dirname(fname)) |
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name = os.path.splitext(os.path.basename(fname))[0] |
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assert name in registry |
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assert registry[name] == [(1.0, 0.0, 0.0), (0.0, 1.0, 0.0), (0.0, 0.0, 1.0)] |
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finally: |
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os.remove(fname) |
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os.remove(bad_file) |
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def test_read_file(registry): |
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"""Test reading a colortable from a file.""" |
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fobj = StringIO('(0., 0., 1.0)\n"red"\n"#0000FF" #Blue') |
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registry.add_colortable(fobj, 'test_table') |
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assert 'test_table' in registry |
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assert registry['test_table'] == [(0.0, 0.0, 1.0), (1.0, 0.0, 0.0), (0.0, 0.0, 1.0)] |
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def test_read_bad_file(registry): |
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"""Test what error results when reading a malformed file.""" |
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with pytest.raises(RuntimeError): |
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fobj = StringIO('PADK 704540 ADAK NAS ' |
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'AK US 5188 -17665 4 0') |
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registry.add_colortable(fobj, 'sfstns') |
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def test_get_colortable(registry): |
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"""Test getting a colortable from the registry.""" |
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true_colors = [(0.0, 0.0, 1.0), (1.0, 0.0, 0.0)] |
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registry['table'] = true_colors |
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table = registry.get_colortable('table') |
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assert table.N == 2 |
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assert table.colors == true_colors |
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85
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View Code Duplication |
def test_get_steps(registry): |
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"""Test getting a colortable and norm with appropriate steps.""" |
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registry['table'] = [(0.0, 0.0, 1.0), (1.0, 0.0, 0.0), (0.0, 1.0, 0.0)] |
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norm, cmap = registry.get_with_steps('table', 5., 10.) |
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assert cmap(norm(np.array([6.]))).tolist() == [[0.0, 0.0, 1.0, 1.0]] |
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assert cmap(norm(np.array([14.9]))).tolist() == [[0.0, 0.0, 1.0, 1.0]] |
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assert cmap(norm(np.array([15.1]))).tolist() == [[1.0, 0.0, 0.0, 1.0]] |
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assert cmap(norm(np.array([26.]))).tolist() == [[0.0, 1.0, 0.0, 1.0]] |
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def test_get_steps_negative_start(registry): |
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"""Test bad start for get with steps (issue #81).""" |
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registry['table'] = [(0.0, 0.0, 1.0), (1.0, 0.0, 0.0), (0.0, 1.0, 0.0)] |
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norm, cmap = registry.get_with_steps('table', -10, 5) |
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assert norm.vmin == -10 |
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assert norm.vmax == 5 |
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View Code Duplication |
def test_get_boundaries(registry): |
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"""Test getting a colortable with explicit boundaries.""" |
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registry['table'] = [(0.0, 0.0, 1.0), (1.0, 0.0, 0.0), (0.0, 1.0, 0.0)] |
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norm, cmap = registry.get_with_boundaries('table', [0., 8., 10., 20.]) |
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assert cmap(norm(np.array([7.]))).tolist() == [[0.0, 0.0, 1.0, 1.0]] |
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assert cmap(norm(np.array([9.]))).tolist() == [[1.0, 0.0, 0.0, 1.0]] |
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assert cmap(norm(np.array([10.1]))).tolist() == [[0.0, 1.0, 0.0, 1.0]] |
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def test_gempak(): |
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"""Test GEMPAK colortable conversion.""" |
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infile = StringIO('''! wvcolor.tbl |
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0 0 0 |
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255 255 255 |
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''') |
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outfile = StringIO() |
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# Do the conversion |
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convert_gempak_table(infile, outfile) |
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# Reset and grab contents |
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outfile.seek(0) |
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result = outfile.read() |
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assert result == '(0.000000, 0.000000, 0.000000)\n(1.000000, 1.000000, 1.000000)\n' |
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Unidata /
MetPy
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