150 lines
4.8 KiB
Python
150 lines
4.8 KiB
Python
# Copyright (c) Streamlit Inc. (2018-2022) Snowflake Inc. (2022-2025)
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Streamlit support for GraphViz charts."""
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from __future__ import annotations
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from typing import TYPE_CHECKING, Union, cast
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from typing_extensions import TypeAlias
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from streamlit import type_util
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from streamlit.errors import StreamlitAPIException
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from streamlit.proto.GraphVizChart_pb2 import GraphVizChart as GraphVizChartProto
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from streamlit.runtime.metrics_util import gather_metrics
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from streamlit.util import calc_md5
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if TYPE_CHECKING:
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import graphviz
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from streamlit.delta_generator import DeltaGenerator
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FigureOrDot: TypeAlias = Union[
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"graphviz.Graph", "graphviz.Digraph", "graphviz.Source", str
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]
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class GraphvizMixin:
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@gather_metrics("graphviz_chart")
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def graphviz_chart(
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self,
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figure_or_dot: FigureOrDot,
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use_container_width: bool = False,
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) -> DeltaGenerator:
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"""Display a graph using the dagre-d3 library.
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Parameters
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----------
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figure_or_dot : graphviz.dot.Graph, graphviz.dot.Digraph, graphviz.sources.Source, str
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The Graphlib graph object or dot string to display
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use_container_width : bool
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Whether to override the figure's native width with the width of
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the parent container. If ``use_container_width`` is ``False``
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(default), Streamlit sets the width of the chart to fit its contents
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according to the plotting library, up to the width of the parent
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container. If ``use_container_width`` is ``True``, Streamlit sets
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the width of the figure to match the width of the parent container.
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Example
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-------
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>>> import streamlit as st
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>>> import graphviz
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>>>
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>>> # Create a graphlib graph object
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>>> graph = graphviz.Digraph()
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>>> graph.edge("run", "intr")
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>>> graph.edge("intr", "runbl")
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>>> graph.edge("runbl", "run")
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>>> graph.edge("run", "kernel")
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>>> graph.edge("kernel", "zombie")
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>>> graph.edge("kernel", "sleep")
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>>> graph.edge("kernel", "runmem")
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>>> graph.edge("sleep", "swap")
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>>> graph.edge("swap", "runswap")
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>>> graph.edge("runswap", "new")
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>>> graph.edge("runswap", "runmem")
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>>> graph.edge("new", "runmem")
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>>> graph.edge("sleep", "runmem")
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>>>
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>>> st.graphviz_chart(graph)
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Or you can render the chart from the graph using GraphViz's Dot
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language:
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>>> st.graphviz_chart('''
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digraph {
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run -> intr
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intr -> runbl
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runbl -> run
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run -> kernel
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kernel -> zombie
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kernel -> sleep
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kernel -> runmem
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sleep -> swap
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swap -> runswap
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runswap -> new
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runswap -> runmem
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new -> runmem
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sleep -> runmem
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}
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''')
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.. output::
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https://doc-graphviz-chart.streamlit.app/
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height: 600px
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"""
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# Generate element ID from delta path
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delta_path = self.dg._get_delta_path_str()
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element_id = calc_md5(delta_path.encode())
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graphviz_chart_proto = GraphVizChartProto()
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marshall(graphviz_chart_proto, figure_or_dot, use_container_width, element_id)
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return self.dg._enqueue("graphviz_chart", graphviz_chart_proto)
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@property
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def dg(self) -> DeltaGenerator:
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"""Get our DeltaGenerator."""
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return cast("DeltaGenerator", self)
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def marshall(
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proto: GraphVizChartProto,
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figure_or_dot: FigureOrDot,
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use_container_width: bool,
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element_id: str,
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) -> None:
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"""Construct a GraphViz chart object.
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See DeltaGenerator.graphviz_chart for docs.
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"""
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if type_util.is_graphviz_chart(figure_or_dot):
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dot = figure_or_dot.source
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engine = figure_or_dot.engine
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elif isinstance(figure_or_dot, str):
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dot = figure_or_dot
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engine = "dot"
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else:
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raise StreamlitAPIException(
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f"Unhandled type for graphviz chart: {type(figure_or_dot)}"
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)
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proto.spec = dot
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proto.engine = engine
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proto.use_container_width = use_container_width
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proto.element_id = element_id
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