Source code for bokeh.models.renderers

""" Models (mostly base classes) for the various kinds of renderer
types that Bokeh supports.

"""
from __future__ import absolute_import

import logging
logger = logging.getLogger(__name__)

from ..model import Model
from ..core.enums import RenderLevel
from ..core.properties import abstract
from ..core.properties import String, Enum, Instance, Float, Bool, Override
from ..core import validation
from ..core.validation.errors import BAD_COLUMN_NAME, MISSING_GLYPH, NO_SOURCE_FOR_GLYPH

from .glyphs import Glyph
from .images import ImageSource
from .sources import DataSource, RemoteSource, ColumnDataSource
from .tiles import TileSource, WMTSTileSource

@abstract
[docs]class Renderer(Model): """An abstract base class for renderer types. """ level = Enum(RenderLevel, help=""" Specifies the level in which to paint this renderer. """) visible = Bool(default=True, help=""" Is the renderer visible. Default: True """)
@abstract
[docs]class DataRenderer(Renderer): """ An abstract base class for data renderer types (e.g. ``GlyphRenderer``, ``TileRenderer``). """
[docs]class TileRenderer(DataRenderer): tile_source = Instance(TileSource, default=lambda: WMTSTileSource(), help=""" Local data source to use when rendering glyphs on the plot. """) alpha = Float(1.0, help=""" tile opacity 0.0 - 1.0 """) x_range_name = String('default', help=""" A particular (named) x-range to use for computing screen locations when rendering glyphs on the plot. If unset, use the default x-range. """) y_range_name = String('default', help=""" A particular (named) y-range to use for computing screen locations when rendering glyphs on the plot. If unset, use the default y-range. """) level = Override(default="underlay") render_parents = Bool(default=True, help=""" Flag enable/disable drawing of parent tiles while waiting for new tiles to arrive. Default value is True. """)
[docs]class DynamicImageRenderer(DataRenderer): image_source = Instance(ImageSource, help=""" Image source to use when rendering on the plot. """) alpha = Float(1.0, help=""" tile opacity 0.0 - 1.0 """) level = Override(default="underlay") render_parents = Bool(default=True, help=""" Flag enable/disable drawing of parent tiles while waiting for new tiles to arrive. Default value is True. """)
[docs]class GlyphRenderer(DataRenderer): """ """ @validation.error(MISSING_GLYPH) def _check_missing_glyph(self): if not self.glyph: return str(self) @validation.error(NO_SOURCE_FOR_GLYPH) def _check_no_source_for_glyph(self): if not self.data_source: return str(self) @validation.error(BAD_COLUMN_NAME) def _check_bad_column_name(self): if not self.glyph: return if not self.data_source: return if isinstance(self.data_source, RemoteSource): return missing = set() specs = self.glyph.dataspecs() for name, item in self.glyph.properties_with_values(include_defaults=False).items(): if name not in specs: continue if not isinstance(item, dict): continue if not isinstance(self.data_source, ColumnDataSource): continue if 'field' in item and item['field'] not in self.data_source.column_names: missing.add(item['field']) if missing: return "%s [renderer: %s]" % (", ".join(sorted(missing)), self) data_source = Instance(DataSource, help=""" Local data source to use when rendering glyphs on the plot. """) x_range_name = String('default', help=""" A particular (named) x-range to use for computing screen locations when rendering glyphs on the plot. If unset, use the default x-range. """) y_range_name = String('default', help=""" A particular (named) y-range to use for computing screen locations when rendering glyphs on the plot. If unset, use the default -range. """) glyph = Instance(Glyph, help=""" The glyph to render, in conjunction with the supplied data source and ranges. """) selection_glyph = Instance(Glyph, help=""" An optional glyph used for selected points. """) nonselection_glyph = Instance(Glyph, help=""" An optional glyph used for explicitly non-selected points (i.e., non-selected when there are other points that are selected, but not when no points at all are selected.) """) hover_glyph = Instance(Glyph, help=""" An optional glyph used for inspected points, e.g., those that are being hovered over by a HoverTool. """) level = Override(default="glyph")
@abstract
[docs]class GuideRenderer(Renderer): """ A base class for all guide renderer types. ``GuideRenderer`` is not generally useful to instantiate on its own. """ plot = Instance(".models.plots.Plot", help=""" The plot to which this guide renderer is attached. """) def __init__(self, **kwargs): super(GuideRenderer, self).__init__(**kwargs) if self.plot is not None: if self not in self.plot.renderers: self.plot.renderers.append(self) level = Override(default="overlay")