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# Copyright (c) 2012 - 2022, Anaconda, Inc., and Bokeh Contributors.
# All rights reserved.
#
# The full license is in the file LICENSE.txt, distributed with this software.
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""" Auxiliary graphical models for aiding glyphs, guide renderers, etc.

"""

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# Boilerplate
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import logging # isort:skip
log = logging.getLogger(__name__)

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# Imports
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# Bokeh imports
from ..core.has_props import abstract
from ..core.properties import Enum, Instance, Required
from ..model import Model

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# Globals and constants
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__all__ = (
    "Decoration",
    "Marking",
)

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# General API
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@abstract
class Marking(Model):
    """ Base class for graphical markings, e.g. arrow heads.

    """

    # explicit __init__ to support Init signatures
    def __init__(self, *args, **kwargs) -> None:
        super().__init__(*args, **kwargs)

class Decoration(Model):
    """ Indicates a positioned marker, e.g. at a node of a glyph.

    """

    # explicit __init__ to support Init signatures
    def __init__(self, *args, **kwargs) -> None:
        super().__init__(*args, **kwargs)

    marking = Instance(Marking, help="""
    The graphical marking associated with this decoration, e.g. an arrow head.
    """)

    node = Required(Enum("start", "middle", "end"), help="""
    The placement of the marking on the parent graphical object.
    """)

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# Dev API
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# Private API
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# Code
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