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holoviews.py
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holoviews.py
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"""
HoloViews integration for Panel including a Pane to render HoloViews
objects and their widgets and support for Links
"""
import sys
from collections import OrderedDict, defaultdict
from distutils.version import LooseVersion
from functools import partial
import param
from bokeh.models import Spacer as _BkSpacer, Range1d
from bokeh.themes.theme import Theme
from ..io import state, unlocked
from ..layout import Column, WidgetBox, HSpacer, VSpacer, Row
from ..viewable import Layoutable, Viewable
from ..widgets import Player
from .base import PaneBase, Pane, RerenderError
from .plot import Bokeh, Matplotlib
from .plotly import Plotly
class HoloViews(PaneBase):
"""
HoloViews panes render any HoloViews object to a corresponding
Bokeh model while respecting the currently selected backend.
"""
backend = param.ObjectSelector(
default=None, objects=['bokeh', 'plotly', 'matplotlib'], doc="""
The HoloViews backend used to render the plot (if None defaults
to the currently selected renderer).""")
center = param.Boolean(default=False, doc="""
Whether to center the plot.""")
linked_axes = param.Boolean(default=True, doc="""
Whether to use link the axes of bokeh plots inside this pane
across a panel layout.""")
renderer = param.Parameter(default=None, doc="""
Explicit renderer instance to use for rendering the HoloViews
plot. Overrides the backend.""")
theme = param.ClassSelector(default=None, class_=(Theme, str),
allow_None=True, doc="""
Bokeh theme to apply to the HoloViews plot.""")
widget_location = param.ObjectSelector(default='right_top', objects=[
'left', 'bottom', 'right', 'top', 'top_left', 'top_right',
'bottom_left', 'bottom_right', 'left_top', 'left_bottom',
'right_top', 'right_bottom'], doc="""
The layout of the plot and the widgets. The value refers to the
position of the widgets relative to the plot.""")
widget_layout = param.ObjectSelector(
objects=[WidgetBox, Row, Column], constant=True, default=WidgetBox, doc="""
The layout object to display the widgets in.""")
widget_type = param.ObjectSelector(default='individual',
objects=['individual', 'scrubber'], doc=""")
Whether to generate individual widgets for each dimension or
on global scrubber.""")
widgets = param.Dict(default={}, doc="""
A mapping from dimension name to a widget instance which will
be used to override the default widgets.""")
priority = 0.8
_panes = {'bokeh': Bokeh, 'matplotlib': Matplotlib, 'plotly': Plotly}
_rename = {
'backend': None, 'center': None, 'linked_axes': None,
'renderer': None, 'theme': None, 'widgets': None,
'widget_layout': None, 'widget_location': None,
'widget_type': None
}
_rerender_params = ['object', 'backend']
def __init__(self, object=None, **params):
super().__init__(object, **params)
self._initialized = False
self._responsive_content = False
self._restore_plot = None
self.widget_box = self.widget_layout()
self._widget_container = []
self._update_widgets()
self._plots = {}
self.param.watch(self._update_widgets, self._rerender_params)
self._initialized = True
@param.depends('center', 'widget_location', watch=True)
def _update_layout(self):
loc = self.widget_location
if not len(self.widget_box):
widgets = []
elif loc in ('left', 'right'):
widgets = Column(VSpacer(), self.widget_box, VSpacer())
elif loc in ('top', 'bottom'):
widgets = Row(HSpacer(), self.widget_box, HSpacer())
elif loc in ('top_left', 'bottom_left'):
widgets = Row(self.widget_box, HSpacer())
elif loc in ('top_right', 'bottom_right'):
widgets = Row(HSpacer(), self.widget_box)
elif loc in ('left_top', 'right_top'):
widgets = Column(self.widget_box, VSpacer())
elif loc in ('left_bottom', 'right_bottom'):
widgets = Column(VSpacer(), self.widget_box)
center = self.center and not self._responsive_content
self._widget_container = widgets
if not widgets:
if center:
components = [HSpacer(), self, HSpacer()]
else:
components = [self]
elif center:
if loc.startswith('left'):
components = [widgets, HSpacer(), self, HSpacer()]
elif loc.startswith('right'):
components = [HSpacer(), self, HSpacer(), widgets]
elif loc.startswith('top'):
components = [HSpacer(), Column(widgets, Row(HSpacer(), self, HSpacer())), HSpacer()]
elif loc.startswith('bottom'):
components = [HSpacer(), Column(Row(HSpacer(), self, HSpacer()), widgets), HSpacer()]
else:
if loc.startswith('left'):
components = [widgets, self]
elif loc.startswith('right'):
components = [self, widgets]
elif loc.startswith('top'):
components = [Column(widgets, self)]
elif loc.startswith('bottom'):
components = [Column(self, widgets)]
self.layout[:] = components
#----------------------------------------------------------------
# Callback API
#----------------------------------------------------------------
@param.depends('theme', watch=True)
def _update_theme(self, *events):
if self.theme is None:
return
for (model, _) in self._models.values():
if model.document:
model.document.theme = self.theme
@param.depends('widget_type', 'widgets', watch=True)
def _update_widgets(self, *events):
if self.object is None:
widgets, values = [], []
else:
widgets, values = self.widgets_from_dimensions(
self.object, self.widgets, self.widget_type)
self._values = values
# Clean up anything models listening to the previous widgets
for cb in list(self._callbacks):
if cb.inst in self.widget_box.objects:
cb.inst.param.unwatch(cb)
self._callbacks.remove(cb)
# Add new widget callbacks
for widget in widgets:
watcher = widget.param.watch(self._widget_callback, 'value')
self._callbacks.append(watcher)
self.widget_box[:] = widgets
if ((widgets and self.widget_box not in self._widget_container) or
(not widgets and self.widget_box in self._widget_container) or
not self._initialized):
self._update_layout()
def _update_plot(self, plot, pane):
from holoviews.core.util import cross_index, wrap_tuple_streams
widgets = self.widget_box.objects
if not widgets:
return
elif self.widget_type == 'scrubber':
key = cross_index([v for v in self._values.values()], widgets[0].value)
else:
key = tuple(w.value for w in widgets)
if plot.dynamic:
widget_dims = [w.name for w in widgets]
key = [key[widget_dims.index(kdim)] if kdim in widget_dims else None
for kdim in plot.dimensions]
key = wrap_tuple_streams(tuple(key), plot.dimensions, plot.streams)
if plot.backend == 'bokeh':
if plot.comm or state._unblocked(plot.document):
with unlocked():
plot.update(key)
if plot.comm and 'embedded' not in plot.root.tags:
plot.push()
else:
if plot.document.session_context:
plot.document.add_next_tick_callback(partial(plot.update, key))
else:
plot.update(key)
else:
plot.update(key)
if hasattr(plot.renderer, 'get_plot_state'):
pane.object = plot.renderer.get_plot_state(plot)
else:
# Compatibility with holoviews<1.13.0
pane.object = plot.state
def _widget_callback(self, event):
for _, (plot, pane) in self._plots.items():
self._update_plot(plot, pane)
#----------------------------------------------------------------
# Model API
#----------------------------------------------------------------
def _get_model(self, doc, root=None, parent=None, comm=None):
from holoviews.plotting.plot import Plot
if root is None:
return self.get_root(doc, comm)
ref = root.ref['id']
if self.object is None:
model = _BkSpacer()
self._models[ref] = (model, parent)
return model
if self._restore_plot is not None:
plot = self._restore_plot
self._restore_plot = None
elif isinstance(self.object, Plot):
plot = self.object
else:
plot = self._render(doc, comm, root)
plot.pane = self
backend = plot.renderer.backend
if hasattr(plot.renderer, 'get_plot_state'):
state = plot.renderer.get_plot_state(plot)
else:
# Compatibility with holoviews<1.13.0
state = plot.state
# Ensure rerender if content is responsive but layout is centered
if (backend == 'bokeh' and self.center and
state.sizing_mode not in ('fixed', None)
and not self._responsive_content):
self._responsive_content = True
self._update_layout()
self._restore_plot = plot
raise RerenderError()
else:
self._responsive_content = False
kwargs = {p: v for p, v in self.param.get_param_values()
if p in Layoutable.param and p != 'name'}
child_pane = self._panes.get(backend, Pane)(state, **kwargs)
self._update_plot(plot, child_pane)
model = child_pane._get_model(doc, root, parent, comm)
if ref in self._plots:
old_plot, old_pane = self._plots[ref]
old_plot.comm = None # Ensures comm does not get cleaned up
old_plot.cleanup()
self._plots[ref] = (plot, child_pane)
self._models[ref] = (model, parent)
return model
def _render(self, doc, comm, root):
import holoviews as hv
from holoviews import Store, renderer as load_renderer
if self.renderer:
renderer = self.renderer
backend = renderer.backend
else:
if not Store.renderers:
loaded_backend = (self.backend or 'bokeh')
load_renderer(loaded_backend)
Store.current_backend = loaded_backend
backend = self.backend or Store.current_backend
renderer = Store.renderers[backend]
mode = 'server' if comm is None else 'default'
if backend == 'bokeh':
params = {}
if self.theme is not None:
params['theme'] = self.theme
if mode != renderer.mode:
params['mode'] = mode
if params:
renderer = renderer.instance(**params)
kwargs = {'margin': self.margin}
if backend == 'bokeh' or LooseVersion(str(hv.__version__)) >= str('1.13.0'):
kwargs['doc'] = doc
kwargs['root'] = root
if comm:
kwargs['comm'] = comm
return renderer.get_plot(self.object, **kwargs)
def _cleanup(self, root):
"""
Traverses HoloViews object to find and clean up any streams
connected to existing plots.
"""
old_plot, old_pane = self._plots.pop(root.ref['id'], (None, None))
if old_plot:
old_plot.cleanup()
if old_pane:
old_pane._cleanup(root)
super()._cleanup(root)
#----------------------------------------------------------------
# Public API
#----------------------------------------------------------------
@classmethod
def applies(cls, obj):
if 'holoviews' not in sys.modules:
return False
from holoviews.core.dimension import Dimensioned
from holoviews.plotting.plot import Plot
return isinstance(obj, Dimensioned) or isinstance(obj, Plot)
@classmethod
def widgets_from_dimensions(cls, object, widget_types=None, widgets_type='individual'):
from holoviews.core import Dimension, DynamicMap
from holoviews.core.options import SkipRendering
from holoviews.core.util import isnumeric, unicode, datetime_types, unique_iterator
from holoviews.core.traversal import unique_dimkeys
from holoviews.plotting.plot import Plot, GenericCompositePlot
from holoviews.plotting.util import get_dynamic_mode
from ..widgets import Widget, DiscreteSlider, Select, FloatSlider, DatetimeInput, IntSlider
if widget_types is None:
widget_types = {}
if isinstance(object, GenericCompositePlot):
object = object.layout
elif isinstance(object, Plot):
object = object.hmap
if isinstance(object, DynamicMap) and object.unbounded:
dims = ', '.join('%r' % dim for dim in object.unbounded)
msg = ('DynamicMap cannot be displayed without explicit indexing '
'as {dims} dimension(s) are unbounded. '
'\nSet dimensions bounds with the DynamicMap redim.range '
'or redim.values methods.')
raise SkipRendering(msg.format(dims=dims))
dynamic, bounded = get_dynamic_mode(object)
dims, keys = unique_dimkeys(object)
if ((dims == [Dimension('Frame')] and keys == [(0,)]) or
(not dynamic and len(keys) == 1)):
return [], {}
nframes = 1
values = dict() if dynamic else dict(zip(dims, zip(*keys)))
dim_values = OrderedDict()
widgets = []
dims = [d for d in dims if values.get(d) is not None or
d.values or d.range != (None, None)]
for i, dim in enumerate(dims):
widget_type, widget, widget_kwargs = None, None, {}
if widgets_type == 'individual':
if i == 0 and i == (len(dims)-1):
margin = (20, 20, 20, 20)
elif i == 0:
margin = (20, 20, 5, 20)
elif i == (len(dims)-1):
margin = (5, 20, 20, 20)
else:
margin = (0, 20, 5, 20)
kwargs = {'margin': margin, 'width': 250}
else:
kwargs = {}
vals = dim.values or values.get(dim, None)
if vals is not None:
vals = list(unique_iterator(vals))
dim_values[dim.name] = vals
if widgets_type == 'scrubber':
if not vals:
raise ValueError('Scrubber widget may only be used if all dimensions define values.')
nframes *= len(vals)
elif dim.name in widget_types:
widget = widget_types[dim.name]
if isinstance(widget, Widget):
widget.param.set_param(**kwargs)
if not widget.name:
widget.name = dim.label
widgets.append(widget)
continue
elif isinstance(widget, dict):
widget_type = widget.get('type', widget_type)
widget_kwargs = dict(widget)
elif isinstance(widget, type) and issubclass(widget, Widget):
widget_type = widget
else:
raise ValueError('Explicit widget definitions expected '
'to be a widget instance or type, %s '
'dimension widget declared as %s.' %
(dim, widget))
widget_kwargs.update(kwargs)
if vals:
if all(isnumeric(v) or isinstance(v, datetime_types) for v in vals) and len(vals) > 1:
vals = sorted(vals)
labels = [unicode(dim.pprint_value(v)) for v in vals]
options = OrderedDict(zip(labels, vals))
widget_type = widget_type or DiscreteSlider
else:
options = list(vals)
widget_type = widget_type or Select
default = vals[0] if dim.default is None else dim.default
widget_kwargs = dict(dict(name=dim.label, options=options, value=default), **widget_kwargs)
widget = widget_type(**widget_kwargs)
elif dim.range != (None, None):
start, end = dim.range
if start == end:
continue
default = start if dim.default is None else dim.default
if widget_type is not None:
pass
elif all(isinstance(v, int) for v in (start, end, default)):
widget_type = IntSlider
step = 1 if dim.step is None else dim.step
elif isinstance(default, datetime_types):
widget_type = DatetimeInput
else:
widget_type = FloatSlider
step = 0.1 if dim.step is None else dim.step
widget_kwargs = dict(dict(step=step, name=dim.label, start=dim.range[0],
end=dim.range[1], value=default),
**widget_kwargs)
widget = widget_type(**widget_kwargs)
if widget is not None:
widgets.append(widget)
if widgets_type == 'scrubber':
widgets = [Player(length=nframes, width=550)]
return widgets, dim_values
class Interactive(PaneBase):
priority = None
def __init__(self, object=None, **params):
super().__init__(object, **params)
self._update_layout()
self.param.watch(self._update_layout_properties, list(Layoutable.param))
@classmethod
def applies(cls, object):
if 'hvplot.interactive' not in sys.modules:
return False
from hvplot.interactive import Interactive
return 0.8 if isinstance(object, Interactive) else False
@param.depends('object')
def _update_layout(self):
if self.object is None:
self._layout_panel = None
else:
self._layout_panel = self.object.layout()
self._layout_panel.param.set_param(**{
p: getattr(self, p) for p in Layoutable.param if p != 'name'
})
def _update_layout_properties(self, *events):
if self._layout_panel is None:
return
self._layout_panel.param.set_param(**{e.name: e.new for e in events})
def _get_model(self, doc, root=None, parent=None, comm=None):
if root is None:
return self.get_root(doc, comm)
if self._layout_panel is None:
model = _BkSpacer(**{
p: getattr(self, p) for p in Layoutable.param if p != 'name'
})
else:
model = self._layout_panel._get_model(doc, root, parent, comm)
self._models[root.ref['id']] = (model, parent)
return model
def _cleanup(self, root):
if self._layout_panel is not None:
self._layout_panel._cleanup(root)
super()._cleanup(root)
def is_bokeh_element_plot(plot):
"""
Checks whether plotting instance is a HoloViews ElementPlot rendered
with the bokeh backend.
"""
from holoviews.plotting.plot import GenericElementPlot, GenericOverlayPlot, Plot
if not isinstance(plot, Plot):
return False
return (plot.renderer.backend == 'bokeh' and isinstance(plot, GenericElementPlot)
and not isinstance(plot, GenericOverlayPlot))
def generate_panel_bokeh_map(root_model, panel_views):
"""
mapping panel elements to its bokeh models
"""
map_hve_bk = defaultdict(list)
ref = root_model.ref['id']
for pane in panel_views:
if root_model.ref['id'] in pane._models:
plot, subpane = pane._plots.get(ref, (None, None))
if plot is None:
continue
bk_plots = plot.traverse(lambda x: x, [is_bokeh_element_plot])
for plot in bk_plots:
for hv_elem in plot.link_sources:
map_hve_bk[hv_elem].append(plot)
return map_hve_bk
def find_links(root_view, root_model):
"""
Traverses the supplied Viewable searching for Links between any
HoloViews based panes.
"""
hv_views = root_view.select(HoloViews)
root_plots = [plot for view in hv_views for plot, _ in view._plots.values()
if getattr(plot, 'root', None) is root_model]
if not len(root_plots) > 1:
return
try:
from holoviews.plotting.links import Link
from holoviews.plotting.bokeh.callbacks import LinkCallback
except Exception:
return
plots = [(plot, root_plot) for root_plot in root_plots
for plot in root_plot.traverse(lambda x: x, [is_bokeh_element_plot])]
potentials = [(LinkCallback.find_link(plot), root_plot)
for plot, root_plot in plots]
source_links = [p for p in potentials if p[0] is not None]
found = []
for (plot, links), root_plot in source_links:
for link in links:
if link.target is None:
# If link has no target don't look further
found.append((link, plot, None))
continue
potentials = [LinkCallback.find_link(plot, link) for plot, inner_root in plots
if inner_root is not root_plot]
tgt_links = [p for p in potentials if p is not None]
if tgt_links:
found.append((link, plot, tgt_links[0][0]))
new_found = set(found) - root_view._found_links
callbacks = []
for link, src_plot, tgt_plot in new_found:
cb = Link._callbacks['bokeh'][type(link)]
if src_plot is None or (getattr(link, '_requires_target', False)
and tgt_plot is None):
continue
callbacks.append(cb(root_model, link, src_plot, tgt_plot))
root_view._found_links.update(new_found)
return callbacks
def link_axes(root_view, root_model):
"""
Pre-processing hook to allow linking axes across HoloViews bokeh
plots.
"""
panes = root_view.select(HoloViews)
if not panes:
return
from holoviews.core.options import Store
from holoviews.core.util import unique_iterator, max_range
from holoviews.plotting.bokeh.element import ElementPlot
ref = root_model.ref['id']
range_map = defaultdict(list)
for pane in panes:
if ref not in pane._plots:
continue
plot = pane._plots[ref][0]
if (not pane.linked_axes or plot.renderer.backend != 'bokeh'
or not getattr(plot, 'shared_axes', False)):
continue
for p in plot.traverse(specs=[ElementPlot]):
if p.current_frame is None:
continue
axiswise = Store.lookup_options('bokeh', p.current_frame, 'norm').kwargs.get('axiswise')
if not p.shared_axes or axiswise:
continue
fig = p.state
if fig.x_range.tags:
tag = tuple(tuple(t) if isinstance(t, list) else t for t in fig.x_range.tags[0])
range_map[tag].append((fig, p, fig.xaxis[0], fig.x_range))
if fig.y_range.tags:
tag = tuple(tuple(t) if isinstance(t, list) else t for t in fig.y_range.tags[0])
range_map[tag].append((fig, p, fig.yaxis[0], fig.y_range))
for (tag), axes in range_map.items():
fig, p, ax, axis = axes[0]
if isinstance(axis, Range1d):
start, end = max_range([
(ax[-1].start, ax[-1].end) for ax in axes
if isinstance(ax[-1], Range1d)
])
if axis.start > axis.end:
end, start = start, end
axis.start = start
axis.end = end
for fig, p, pax, _ in axes[1:]:
changed = []
if type(ax) is not type(pax):
continue
if tag in fig.x_range.tags and not axis is fig.x_range:
if hasattr(axis, 'factors'):
axis.factors = list(unique_iterator(axis.factors+fig.x_range.factors))
fig.x_range = axis
p.handles['x_range'] = axis
changed.append('x_range')
if tag in fig.y_range.tags and not axis is fig.y_range:
if hasattr(axis, 'factors'):
axis.factors = list(unique_iterator(axis.factors+fig.y_range.factors))
fig.y_range = axis
p.handles['y_range'] = axis
changed.append('y_range')
# Reinitialize callbacks linked to replaced axes
subplots = getattr(p, 'subplots')
if subplots:
plots = subplots.values()
else:
plots = [p]
for sp in plots:
for callback in sp.callbacks:
if not any(c in callback.models or c in callback.extra_models for c in changed):
continue
if 'x_range' in changed:
sp.handles['x_range'] = p.handles['x_range']
if 'y_range' in changed:
sp.handles['y_range'] = p.handles['y_range']
callback.reset()
callback.initialize(plot_id=p.id)
Viewable._preprocessing_hooks.append(link_axes)
Viewable._preprocessing_hooks.append(find_links)