import tempfile
from copy import deepcopy
from enum import Enum
from graphviz import Graph
from pm4py.objects.process_tree.utils import generic as util
from pm4py.util import exec_utils, constants
from typing import Optional, Dict, Any, Union
from pm4py.objects.process_tree.obj import ProcessTree
import graphviz
[docs]
class Parameters(Enum):
FORMAT = "format"
COLOR_MAP = "color_map"
ENABLE_DEEPCOPY = "enable_deepcopy"
FONT_SIZE = "font_size"
BGCOLOR = "bgcolor"
RANKDIR = "rankdir"
ENABLE_GRAPH_TITLE = "enable_graph_title"
GRAPH_TITLE = "graph_title"
[docs]
def get_color(node, color_map):
"""
Gets a color for a node from the color map
Parameters
--------------
node
Node
color_map
Color map
"""
if node in color_map:
return color_map[node]
return "black"
[docs]
def repr_tree(tree, viz, color_map, parameters):
font_size = exec_utils.get_param_value(Parameters.FONT_SIZE, parameters, 9)
font_size = str(font_size)
this_node_id = str(id(tree))
if tree.operator is None:
if tree.label is None:
viz.node(
this_node_id,
"tau",
style="filled",
fillcolor="black",
shape="box",
fontsize=font_size,
)
else:
node_color = get_color(tree, color_map)
viz.node(
this_node_id,
str(tree),
color=node_color,
fontcolor=node_color,
fontsize=font_size,
shape="box",
)
else:
node_color = get_color(tree, color_map)
viz.node(
this_node_id,
str(tree.operator),
color=node_color,
fontcolor=node_color,
fontsize=font_size,
shape="circle",
)
for child in tree.children:
repr_tree(child, viz, color_map, parameters)
if tree.parent is not None:
viz.edge(str(id(tree.parent)), this_node_id, dirType="none")
[docs]
def apply(
tree: ProcessTree,
parameters: Optional[Dict[Union[str, Parameters], Any]] = None,
) -> graphviz.Graph:
"""
Obtain a Process Tree representation through GraphViz
Parameters
-----------
tree
Process tree
parameters
Possible parameters of the algorithm
Returns
-----------
gviz
GraphViz object
"""
if parameters is None:
parameters = {}
filename = tempfile.NamedTemporaryFile(suffix=".gv")
filename.close()
bgcolor = exec_utils.get_param_value(
Parameters.BGCOLOR, parameters, constants.DEFAULT_BGCOLOR
)
rankdir = exec_utils.get_param_value(
Parameters.RANKDIR, parameters, constants.DEFAULT_RANKDIR_GVIZ
)
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, "Process Tree"
)
font_size = exec_utils.get_param_value(
Parameters.FONT_SIZE, parameters, 15
)
font_size = str(font_size)
viz = Graph(
"pt",
filename=filename.name,
engine="dot",
graph_attr={"bgcolor": bgcolor, "rankdir": rankdir},
)
viz.attr("node", shape="ellipse", fixedsize="false")
if enable_graph_title:
viz.attr(
label='<<FONT POINT-SIZE="'
+ str(2 * int(font_size))
+ '">'
+ graph_title
+ "</FONT>>",
labelloc="top",
)
image_format = exec_utils.get_param_value(
Parameters.FORMAT, parameters, "png"
)
color_map = exec_utils.get_param_value(
Parameters.COLOR_MAP, parameters, {}
)
enable_deepcopy = exec_utils.get_param_value(
Parameters.ENABLE_DEEPCOPY, parameters, True
)
if enable_deepcopy:
# since the process tree object needs to be sorted in the visualization, make a deepcopy of it before
# proceeding
tree = deepcopy(tree)
util.tree_sort(tree)
repr_tree(tree, viz, color_map, parameters)
viz.attr(overlap="false")
viz.attr(splines="false")
viz.format = image_format.replace("html", "plain-ext")
return viz
