#----------------------------------------------------------------------------- # Copyright (c) 2012 - 2020, Anaconda, Inc., and Bokeh Contributors. # All rights reserved. # # The full license is in the file LICENSE.txt, distributed with this software. #----------------------------------------------------------------------------- ''' Mix-in classes that bulk add groups of properties to Bokeh models. Some groups of properties often show up in Bokeh models together. For instance, any model that exposes a fill color property for use when rendering will almost always want to expose a fill alpha as well. To reduce boilerplate code and simplify defining models with these sets of properties, use the mix-in classes in this module: * |FillProps| --- properties for fill color and alpha * |HatchProps| --- properties for hatching pattern, color, alpha, etc. * |LineProps| --- properties for line color, dashing, width, etc. * |TextProps| --- properties for text color, font, etc. To include these properties in a Bokeh model, use the |Include| property as shown here: .. code-block:: python class SomeGlyph(Glyph): fill_props = Include(FillProps, use_prefix=False, help=""" The %s values for the annular wedges. """) This adds all the fill properties ``fill_color`` and ``fill_alpha`` to this model with one simple statement. Note that the help string contains a placeholder format `%s`. When docs for this class are rendered by the :ref:`bokeh.sphinxext.bokeh_model` Sphinx extension, the placeholder will be replaced with more information specific to each property. The setting ``use_prefix`` means that the names of the properties added to ``SomeGlyph`` are exactly ``fill_alpha`` and ``fill_color``. Some situations require a different usage, for more information see the docs for |Include|. .. |Include| replace:: :class:`~bokeh.core.properties.Include` .. |FillProps| replace:: :class:`~bokeh.core.property_mixins.FillProps` .. |HatchProps| replace:: :class:`~bokeh.core.property_mixins.HatchProps` .. |LineProps| replace:: :class:`~bokeh.core.property_mixins.LineProps` .. |TextProps| replace:: :class:`~bokeh.core.property_mixins.TextProps` ''' #----------------------------------------------------------------------------- # Boilerplate #----------------------------------------------------------------------------- import logging # isort:skip log = logging.getLogger(__name__) #----------------------------------------------------------------------------- # Imports #----------------------------------------------------------------------------- # Bokeh imports from .enums import ( FontStyle, HatchPattern, HatchPatternAbbreviation, LineCap, LineJoin, TextAlign, TextBaseline, ) from .has_props import HasProps from .properties import ( Color, ColorSpec, DashPattern, Dict, Enum, Float, FontSize, FontSizeSpec, HatchPatternSpec, Include, Instance, Int, NumberSpec, Percent, Size, String, value, ) #----------------------------------------------------------------------------- # Globals and constants #----------------------------------------------------------------------------- __all__ = ( 'FillProps', 'HatchProps', 'LineProps', 'TextProps', 'ScalarFillProps', 'ScalarHatchProps', 'ScalarLineProps', 'ScalarTextProps', ) #----------------------------------------------------------------------------- # Private API #----------------------------------------------------------------------------- _color_help = """ A color to use to %s with. Acceptable values are: - any of the 147 named `CSS colors`_, e.g ``'green'``, ``'indigo'`` - an RGB(A) hex value, e.g., ``'#FF0000'``, ``'#44444444'`` - a 3-tuple of integers (r,g,b) between 0 and 255 - a 4-tuple of (r,g,b,a) where r,g,b are integers between 0..255 and a is between 0..1 .. _CSS colors: https://www.w3schools.com/colors/colors_names.asp """ _alpha_help = """ An alpha value to use to %s with. Acceptable values are floating point numbers between 0 (transparent) and 1 (opaque). """ class _BaseLineProps(HasProps): line_join = Enum(LineJoin, default='bevel', help=""" How path segments should be joined together. Acceptable values are: - ``'miter'`` |miter_join| - ``'round'`` |round_join| - ``'bevel'`` |bevel_join| .. |miter_join| image:: /_images/miter_join.png :height: 15 .. |round_join| image:: /_images/round_join.png :height: 15 .. |bevel_join| image:: /_images/bevel_join.png :height: 15 """) line_cap = Enum(LineCap, help=""" How path segments should be terminated. Acceptable values are: - ``'butt'`` |butt_cap| - ``'round'`` |round_cap| - ``'square'`` |square_cap| .. |butt_cap| image:: /_images/butt_cap.png :height: 12 .. |round_cap| image:: /_images/round_cap.png :height: 12 .. |square_cap| image:: /_images/square_cap.png :height: 12 """) line_dash = DashPattern(help=""" How should the line be dashed. """) line_dash_offset = Int(0, help=""" The distance into the ``line_dash`` (in pixels) that the pattern should start from. """) class _BaseTextProps(HasProps): text_font = String("helvetica", help=""" Name of a font to use for rendering text, e.g., ``'times'``, ``'helvetica'``. """) text_font_style = Enum(FontStyle, help=""" A style to use for rendering text. Acceptable values are: - ``'normal'`` normal text - ``'italic'`` *italic text* - ``'bold'`` **bold text** - ``"bold italic"`` ***bold italic text*** """) text_align = Enum(TextAlign, help=""" Horizontal anchor point to use when rendering text. Acceptable values are: - ``'left'`` - ``'right'`` - ``'center'`` """) text_baseline = Enum(TextBaseline, default="bottom", help=""" Vertical anchor point to use when rendering text. Acceptable values are: - ``'top'`` - ``'middle'`` - ``'bottom'`` - ``'alphabetic'`` - ``'hanging'`` - ``'ideographic'`` """) text_line_height = Float(default=1.2, help=""" In multi-line text, how much additional space should be allocated for each line. The value is provided as a number, but should be treated as a percentage of font size. The default is 120%. Setting it to 1.0, so 100%, means no additional space will be used. """) #---------------------------------------------------------------------------- # General API #---------------------------------------------------------------------------- [docs]class FillProps(HasProps): ''' Properties relevant to rendering fill regions. Mirrors the BokehJS ``properties.Fill`` class. ''' fill_color = ColorSpec(default="gray", help=_color_help % "fill paths") fill_alpha = NumberSpec(default=1.0, accept_datetime=False, accept_timedelta=False, help=_alpha_help % "fill paths") [docs]class ScalarFillProps(HasProps): ''' Properties relevant to rendering fill regions. Mirrors the BokehJS ``properties.Fill`` class. ''' fill_color = Color(default="gray", help=_color_help % "fill paths") fill_alpha = Percent(default=1.0, help=_alpha_help) _hatch_scale_help = """ A rough measure of the 'size' of the hatching pattern. Generally speaking, the higher the number, the more spread out the pattern will be. """ _hatch_pattern_help = """ Built-in patterns are can either be specified as long names: %s or as one-letter abbreviations: %s """ % (", ". join(HatchPattern), ", ". join(repr(x) for x in HatchPatternAbbreviation)) _hatch_weight_help = """ A width value for line-strokes used in hatching. """ [docs]class HatchProps(HasProps): ''' Properties relevant to rendering fill regions. Mirrors the BokehJS ``properties.Hatch`` class. ''' hatch_color = ColorSpec(default="black", help=_color_help % "hatching") hatch_alpha = NumberSpec(default=1.0, accept_datetime=False, accept_timedelta=False, help=_alpha_help % "hatching") hatch_scale = NumberSpec(default=12.0, accept_datetime=False, accept_timedelta=False, help=_hatch_scale_help) hatch_pattern = HatchPatternSpec(default=None, help=_hatch_pattern_help) hatch_weight = NumberSpec(default=1.0, accept_datetime=False, accept_timedelta=False, help=_hatch_weight_help) hatch_extra = Dict(String, Instance("bokeh.models.textures.Texture")) [docs]class ScalarHatchProps(HasProps): ''' Properties relevant to rendering fill regions. Mirrors the BokehJS ``properties.Hatch`` class. ''' hatch_color = Color(default="black", help=_color_help % "hatching") hatch_alpha = Percent(default=1.0, help=_alpha_help % "hatching") hatch_scale = Size(default=12.0, help=_hatch_scale_help) hatch_pattern = String(default=None, help=_hatch_pattern_help) # String to accommodate user custom values hatch_weight = Size(default=1.0, help=_hatch_weight_help) hatch_extra = Dict(String, Instance("bokeh.models.textures.Texture")) _line_width_help = """ Stroke width in units of pixels. """ [docs]class LineProps(HasProps): ''' Properties relevant to rendering path operations. Mirrors the BokehJS ``properties.Line`` class. ''' base_line_props = Include(_BaseLineProps, use_prefix=False) line_color = ColorSpec(default="black", help=_color_help % "stroke paths") line_width = NumberSpec(default=1, accept_datetime=False, accept_timedelta=False, help=_line_width_help) line_alpha = NumberSpec(default=1.0, accept_datetime=False, accept_timedelta=False, help=_alpha_help % "stroke paths") [docs]class ScalarLineProps(HasProps): ''' Properties relevant to rendering path operations. Mirrors the BokehJS ``properties.Line`` class. ''' base_line_props = Include(_BaseLineProps, use_prefix=False) line_color = Color(default="black", help=_color_help % "stroke paths") line_width = Float(default=1, help=_line_width_help) line_alpha = Percent(default=1.0, help=_alpha_help % "stroke paths") [docs]class TextProps(HasProps): ''' Properties relevant to rendering text. Mirrors the BokehJS ``properties.Text`` class. .. note:: There is currently only support for filling text. An interface to stroke the outlines of text has not yet been exposed. ''' base_text_props = Include(_BaseTextProps, use_prefix=False) text_font_size = FontSizeSpec(value("16px")) text_color = ColorSpec(default="#444444", help=_color_help % "fill text") text_alpha = NumberSpec(default=1.0, accept_datetime=False, accept_timedelta=False, help=_alpha_help % "fill text") [docs]class ScalarTextProps(HasProps): ''' Properties relevant to rendering text. Mirrors the BokehJS ``properties.Text`` class. .. note:: There is currently only support for filling text. An interface to stroke the outlines of text has not yet been exposed. ''' base_text_props = Include(_BaseTextProps, use_prefix=False) # XXX not great text_font_size = FontSize("16px") text_color = Color(default="#444444", help=_color_help % "fill text") text_alpha = Percent(default=1.0, help=_alpha_help % "fill text") #----------------------------------------------------------------------------- # Dev API #----------------------------------------------------------------------------- #----------------------------------------------------------------------------- # Code #-----------------------------------------------------------------------------