''' 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 ..core.enums import RenderLevel
from ..core.has_props import abstract
from ..core.properties import Auto, Bool, Either, Enum, Float, Instance, Override, String
from ..core.validation import error
from ..core.validation.errors import (BAD_COLUMN_NAME, MISSING_GLYPH, NO_SOURCE_FOR_GLYPH,
CDSVIEW_SOURCE_DOESNT_MATCH, MALFORMED_GRAPH_SOURCE)
from ..model import Model
from .glyphs import Glyph, Circle, MultiLine
from .graphs import LayoutProvider, GraphHitTestPolicy, NodesOnly
from .sources import ColumnDataSource, DataSource, RemoteSource, CDSView
from .tiles import TileSource, WMTSTileSource
[docs]@abstract
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.
""")
[docs]@abstract
class DataRenderer(Renderer):
''' An abstract base class for data renderer types (e.g. ``GlyphRenderer``, ``TileRenderer``, ``GraphRenderer``).
'''
[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
""")
smoothing = Bool(default=True, help="""
Enable image smoothing for the rendered tiles.
""")
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 GlyphRenderer(DataRenderer):
'''
'''
@error(MISSING_GLYPH)
def _check_missing_glyph(self):
if not self.glyph: return str(self)
@error(NO_SOURCE_FOR_GLYPH)
def _check_no_source_for_glyph(self):
if not self.data_source: return str(self)
@error(CDSVIEW_SOURCE_DOESNT_MATCH)
def _check_cdsview_source(self):
if self.data_source is not self.view.source: return str(self)
@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)
def __init__(self, **kw):
super(GlyphRenderer, self).__init__(**kw)
if "view" not in kw:
self.view = CDSView(source=self.data_source)
data_source = Instance(DataSource, help="""
Local data source to use when rendering glyphs on the plot.
""")
view = Instance(CDSView, help="""
A view into the data source to use when rendering glyphs. A default view
of the entire data source is created when a view is not passed in during
initialization.
""")
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.
""")
glyph = Instance(Glyph, help="""
The glyph to render, in conjunction with the supplied data source
and ranges.
""")
selection_glyph = Either(Auto, Instance(Glyph), default="auto", help="""
An optional glyph used for selected points.
If set to "auto" then the standard glyph will be used for selected
points.
""")
nonselection_glyph = Either(Auto, Instance(Glyph), default="auto", 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.)
If set to "auto" then a glyph with a low alpha value (0.1) will
be used for non-selected points.
""")
hover_glyph = Instance(Glyph, help="""
An optional glyph used for inspected points, e.g., those that are
being hovered over by a HoverTool.
""")
muted_glyph = Instance(Glyph, help="""
""")
muted = Bool(False, help="""
""")
level = Override(default="glyph")
_DEFAULT_NODE_RENDERER = lambda: GlyphRenderer(
glyph=Circle(), data_source=ColumnDataSource(data=dict(index=[]))
)
_DEFAULT_EDGE_RENDERER = lambda: GlyphRenderer(
glyph=MultiLine(), data_source=ColumnDataSource(data=dict(start=[], end=[]))
)
[docs]class GraphRenderer(DataRenderer):
'''
'''
@error(MALFORMED_GRAPH_SOURCE)
def _check_malformed_graph_source(self):
missing = []
if "index" not in self.node_renderer.data_source.column_names:
missing.append("Column 'index' is missing in GraphSource.node_renderer.data_source")
if "start" not in self.edge_renderer.data_source.column_names:
missing.append("Column 'start' is missing in GraphSource.edge_renderer.data_source")
if "end" not in self.edge_renderer.data_source.column_names:
missing.append("Column 'end' is missing in GraphSource.edge_renderer.data_source")
if missing:
return " ,".join(missing) + " [%s]" % self
x_range_name = String('default', help="""
A particular (named) x-range to use for computing screen
locations when rendering graphs 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 graphs on the plot. If unset, use the
default y-range.
""")
layout_provider = Instance(LayoutProvider, help="""
An instance of a LayoutProvider that supplies the layout of the network
graph in cartesian space.
""")
node_renderer = Instance(GlyphRenderer, default=_DEFAULT_NODE_RENDERER, help="""
Instance of a GlyphRenderer containing an XYGlyph that will be rendered
as the graph nodes.
""")
edge_renderer = Instance(GlyphRenderer, default=_DEFAULT_EDGE_RENDERER, help="""
Instance of a GlyphRenderer containing an MultiLine Glyph that will be
rendered as the graph edges.
""")
selection_policy = Instance(GraphHitTestPolicy, default=lambda: NodesOnly(), help="""
An instance of a GraphHitTestPolicy that provides the logic for selection
of graph components.
""")
inspection_policy = Instance(GraphHitTestPolicy, default=lambda: NodesOnly(), help="""
An instance of a GraphHitTestPolicy that provides the logic for inspection
of graph components.
""")
level = Override(default="glyph")
[docs]@abstract
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")
