#
# Copyright (C) 2014-2016  Leo Singer
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
"""Register some extra Matplotlib color maps"""

try:
    from importlib import resources
except ImportError:
    # FIXME: remove after dropping support for Python < 3.7
    import importlib_resources as resources

from matplotlib import cm
from matplotlib import colors
import numpy as np

__all__ = ()


for name in ['cylon']:
    # Read in color map RGB data.
    with resources.open_text(__package__, name + '.csv') as f:
        data = np.loadtxt(f, delimiter=',')

    # Create color map.
    cmap = colors.LinearSegmentedColormap.from_list(name, data)
    # Assign in module.
    locals().update({name: cmap})
    # Register with Matplotlib.
    cm.register_cmap(cmap=cmap)

    # Generate reversed color map.
    name += '_r'
    data = data[::-1]
    cmap = colors.LinearSegmentedColormap.from_list(name, data)
    # Assign in module.
    locals().update({name: cmap})
    # Register with Matplotlib.
    cm.register_cmap(cmap=cmap)
