from pm4py.util import exec_utils
from enum import Enum
import tempfile
from graphviz import Digraph
from typing import Optional, Dict, Any
from pm4py.objects.bpmn.obj import BPMN
from pm4py.visualization.common import gview
from pm4py.visualization.common import save as gsave
from pm4py.util import constants
import graphviz
[docs]
class Parameters(Enum):
FORMAT = "format"
RANKDIR = "rankdir"
FONT_SIZE = "font_size"
BGCOLOR = "bgcolor"
ENABLE_SWIMLANES = "enable_swimlanes"
INCLUDE_NAME_IN_EVENTS = "include_name_in_events"
SWIMLANES_MARGIN = "swimlanes_margin"
ENABLE_GRAPH_TITLE = "enable_graph_title"
GRAPH_TITLE = "graph_title"
ENDPOINTS_SHAPE = "endpoints_shape"
[docs]
def add_bpmn_node(
graph, n, font_size, include_name_in_events, endpoints_shape
):
n_id = str(id(n))
node_label = str(n.name) if include_name_in_events else ""
if isinstance(n, BPMN.Task):
graph.node(n_id, shape="box", label=n.get_name(), fontsize=font_size)
elif isinstance(n, BPMN.StartEvent):
graph.node(
n_id,
label="",
shape=endpoints_shape,
style="filled",
fillcolor="green",
fontsize=font_size,
)
elif isinstance(n, BPMN.EndEvent):
graph.node(
n_id,
label="",
shape=endpoints_shape,
style="filled",
fillcolor="orange",
fontsize=font_size,
)
elif isinstance(n, BPMN.Event):
graph.node(
n_id, label=node_label, shape="underline", fontsize=font_size
)
elif isinstance(n, BPMN.TextAnnotation):
graph.node(n_id, shape="box", label=n.text, fontsize=font_size)
elif isinstance(n, BPMN.ParallelGateway):
graph.node(n_id, label="+", shape="diamond", fontsize=font_size)
elif isinstance(n, BPMN.ExclusiveGateway):
graph.node(n_id, label="X", shape="diamond", fontsize=font_size)
elif isinstance(n, BPMN.EventBasedGateway):
graph.node(n_id, label="E", shape="diamond", fontsize=font_size)
elif isinstance(n, BPMN.InclusiveGateway):
graph.node(n_id, label="O", shape="diamond", fontsize=font_size)
else:
# do nothing here
return False
return True
[docs]
def apply(
bpmn_graph: BPMN, parameters: Optional[Dict[Any, Any]] = None
) -> graphviz.Digraph:
"""
Visualize a BPMN graph
Parameters
-------------
bpmn_graph
BPMN graph
parameters
Parameters of the visualization, including:
- Parameters.FORMAT: the format of the visualization
- Parameters.RANKDIR: the direction of the representation (default: LR)
Returns
------------
gviz
Graphviz representation
"""
if parameters is None:
parameters = {}
from pm4py.objects.bpmn.obj import BPMN
from pm4py.objects.bpmn.util.sorting import get_sorted_nodes_edges
image_format = exec_utils.get_param_value(
Parameters.FORMAT, parameters, "png"
)
rankdir = exec_utils.get_param_value(
Parameters.RANKDIR, parameters, constants.DEFAULT_RANKDIR_GVIZ
)
font_size = exec_utils.get_param_value(
Parameters.FONT_SIZE, parameters, 12
)
font_size = str(font_size)
bgcolor = exec_utils.get_param_value(
Parameters.BGCOLOR, parameters, constants.DEFAULT_BGCOLOR
)
enable_swimlanes = exec_utils.get_param_value(
Parameters.ENABLE_SWIMLANES, parameters, True
)
include_name_in_events = exec_utils.get_param_value(
Parameters.INCLUDE_NAME_IN_EVENTS, parameters, True
)
swimlanes_margin = exec_utils.get_param_value(
Parameters.SWIMLANES_MARGIN, parameters, 35
)
swimlanes_margin = str(swimlanes_margin)
enable_graph_title = exec_utils.get_param_value(
Parameters.ENABLE_GRAPH_TITLE,
parameters,
constants.DEFAULT_ENABLE_GRAPH_TITLES,
)
graph_title = exec_utils.get_param_value(
Parameters.GRAPH_TITLE, parameters, "BPMN Diagram"
)
endpoints_shape = exec_utils.get_param_value(
Parameters.ENDPOINTS_SHAPE, parameters, "circle"
)
filename = tempfile.NamedTemporaryFile(suffix=".gv")
filename.close()
viz = Digraph(
"",
filename=filename.name,
engine="dot",
graph_attr={"bgcolor": bgcolor},
)
viz.graph_attr["rankdir"] = rankdir
if enable_graph_title:
viz.attr(
label='<<FONT POINT-SIZE="'
+ str(2 * int(font_size))
+ '">'
+ graph_title
+ "</FONT>>",
labelloc="top",
)
nodes, edges = get_sorted_nodes_edges(bpmn_graph)
process_ids = []
for n in nodes:
if n.process not in process_ids:
process_ids.append(n.process)
process_ids_members = {n.process: list() for n in nodes}
for n in nodes:
process_ids_members[n.process].append(n)
participant_nodes = [n for n in nodes if isinstance(n, BPMN.Participant)]
pref_pname = {x.process_ref: x.name for x in participant_nodes}
pref_pid = {x.process_ref: str(id(x)) for x in participant_nodes}
added_nodes = set()
if len(participant_nodes) < 1 or not enable_swimlanes:
for n in nodes:
if add_bpmn_node(
viz, n, font_size, include_name_in_events, endpoints_shape
):
added_nodes.add(str(id(n)))
else:
# style='invis'
viz.node("@@anchorStart", style="invis")
viz.node("@@anchorEnd", style="invis")
for subp in process_ids:
this_added_nodes = []
if subp in pref_pname:
with viz.subgraph(name="cluster" + pref_pid[subp]) as c:
c.attr(label=pref_pname[subp])
c.attr(margin=swimlanes_margin)
for n in process_ids_members[subp]:
if add_bpmn_node(
c,
n,
font_size,
include_name_in_events,
endpoints_shape,
):
added_nodes.add(str(id(n)))
this_added_nodes.append(str(id(n)))
# c.attr(rank='same')
if this_added_nodes:
viz.edge(
"@@anchorStart", this_added_nodes[0], style="invis"
)
viz.edge(
this_added_nodes[-1], "@@anchorEnd", style="invis"
)
for e in edges:
n_id_1 = str(id(e[0]))
n_id_2 = str(id(e[1]))
if n_id_1 in added_nodes and n_id_2 in added_nodes:
viz.edge(n_id_1, n_id_2)
viz.attr(overlap="false")
viz.format = image_format.replace("html", "plain-ext")
return viz
[docs]
def save(gviz: graphviz.Digraph, output_file_path: str, parameters=None):
"""
Save the diagram
Parameters
-----------
gviz
GraphViz diagram
output_file_path
Path where the GraphViz output should be saved
"""
gsave.save(gviz, output_file_path, parameters=parameters)
return ""
[docs]
def view(gviz: graphviz.Digraph, parameters=None):
"""
View the diagram
Parameters
-----------
gviz
GraphViz diagram
"""
if constants.DEFAULT_ENABLE_VISUALIZATIONS_VIEW:
return gview.view(gviz, parameters=parameters)
[docs]
def matplotlib_view(gviz: graphviz.Digraph, parameters=None):
"""
Views the diagram using Matplotlib
Parameters
---------------
gviz
Graphviz
"""
if constants.DEFAULT_ENABLE_VISUALIZATIONS_VIEW:
return gview.matplotlib_view(gviz, parameters=parameters)
