dash-cytoscape/usage-elements.py at main · plotly/dash-cytoscape · GitHub

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import json

import dash

from dash import Input, Output, State, dcc, html, callback

import dash_cytoscape as cyto

from demos import dash_reusable_components as drc

app = dash.Dash(__name__)

server = app.server

# ###################### DATA PREPROCESSING ######################

# Load data

with open("demos/data/sample_network.txt", "r", encoding="utf-8") as f:

network_data = f.read().split("\n")

# We select the first 750 edges and associated nodes for an easier visualization

edges = network_data[:750]

nodes = set()

following_node_di = {} # user id -> list of users they are following

following_edges_di = {} # user id -> list of cy edges starting from user id

followers_node_di = {} # user id -> list of followers (cy_node format)

followers_edges_di = {} # user id -> list of cy edges ending at user id

cy_edges = []

cy_nodes = []

for edge in edges:

if " " not in edge:

continue

source, target = edge.split(" ")

cy_edge = {"data": {"id": source + target, "source": source, "target": target}}

cy_target = {"data": {"id": target, "label": "User #" + str(target[-5:])}}

cy_source = {"data": {"id": source, "label": "User #" + str(source[-5:])}}

if source not in nodes:

nodes.add(source)

cy_nodes.append(cy_source)

if target not in nodes:

nodes.add(target)

cy_nodes.append(cy_target)

# Process dictionary of following

if not following_node_di.get(source):

following_node_di[source] = []

if not following_edges_di.get(source):

following_edges_di[source] = []

following_node_di[source].append(cy_target)

following_edges_di[source].append(cy_edge)

# Process dictionary of followers

if not followers_node_di.get(target):

followers_node_di[target] = []

if not followers_edges_di.get(target):

followers_edges_di[target] = []

followers_node_di[target].append(cy_source)

followers_edges_di[target].append(cy_edge)

genesis_node = cy_nodes[0]

genesis_node["classes"] = "genesis"

default_elements = [genesis_node]

default_stylesheet = [

{"selector": "node", "style": {"opacity": 0.65, "z-index": 9999}},

{

"selector": "edge",

"style": {"curve-style": "bezier", "opacity": 0.45, "z-index": 5000},

{"selector": ".followerNode", "style": {"background-color": "#0074D9"}},

{

"selector": ".followerEdge",

"style": {

"mid-target-arrow-color": "blue",

"mid-target-arrow-shape": "vee",

"line-color": "#0074D9",

{"selector": ".followingNode", "style": {"background-color": "#FF4136"}},

{

"selector": ".followingEdge",

"style": {

"mid-target-arrow-color": "red",

"mid-target-arrow-shape": "vee",

"line-color": "#FF4136",

{

"selector": ".genesis",

"style": {

"background-color": "#B10DC9",

"border-width": 2,

"border-color": "purple",

"border-opacity": 1,

"opacity": 1,

"label": "data(label)",

"color": "#B10DC9",

"text-opacity": 1,

"font-size": 12,

"z-index": 9999,

{

"selector": ":selected",

"style": {

"border-width": 2,

"border-color": "black",

"border-opacity": 1,

"opacity": 1,

"label": "data(label)",

"color": "black",

"font-size": 12,

"z-index": 9999,

]

# ################################# APP LAYOUT ################################

styles = {

"json-output": {

"overflow-y": "scroll",

"height": "calc(50% - 25px)",

"border": "thin lightgrey solid",

"tab": {"height": "calc(98vh - 80px)"},

}

app.layout = html.Div(

[

html.Div(

className="eight columns",

children=[

cyto.Cytoscape(

id="cytoscape",

elements=default_elements,

stylesheet=default_stylesheet,

style={"height": "95vh", "width": "100%"},

)

html.Div(

className="four columns",

children=[

dcc.Tabs(

id="tabs",

children=[

dcc.Tab(

label="Control Panel",

children=[

drc.NamedDropdown(

name="Layout",

id="dropdown-layout",

options=drc.DropdownOptionsList(

"random",

"grid",

"circle",

"concentric",

"breadthfirst",

"cose",

value="grid",

clearable=False,

drc.NamedRadioItems(

name="Expand",

id="radio-expand",

options=drc.DropdownOptionsList(

"followers", "following"

value="followers",

dcc.Tab(

label="JSON",

children=[

html.Div(

style=styles["tab"],

children=[

html.P("Node Object JSON:"),

html.Pre(

id="tap-node-json-output",

style=styles["json-output"],

html.P("Edge Object JSON:"),

html.Pre(

id="tap-edge-json-output",

style=styles["json-output"],

)

]

)

# ############################## CALLBACKS ####################################

@callback(Output("tap-node-json-output", "children"), Input("cytoscape", "tapNode"))

def display_tap_node(data):

return json.dumps(data, indent=2)

@callback(Output("tap-edge-json-output", "children"), Input("cytoscape", "tapEdge"))

def display_tap_edge(data):

return json.dumps(data, indent=2)

@callback(Output("cytoscape", "layout"), Input("dropdown-layout", "value"))

def update_cytoscape_layout(layout):

return {"name": layout}

@callback(

Output("cytoscape", "elements"),

Input("cytoscape", "tapNodeData"),

State("cytoscape", "elements"),

State("radio-expand", "value"),

)

def generate_elements(nodeData, elements, expansion_mode):

if not nodeData:

return default_elements

# If the node has already been expanded, we don't expand it again

if nodeData.get("expanded"):

return elements

# This retrieves the currently selected element, and tag it as expanded

for element in elements:

if nodeData["id"] == element.get("data").get("id"):

element["data"]["expanded"] = True

break

if expansion_mode == "followers":

followers_nodes = followers_node_di.get(nodeData["id"])

followers_edges = followers_edges_di.get(nodeData["id"])

if followers_nodes:

for node in followers_nodes:

node["classes"] = "followerNode"

elements.extend(followers_nodes)

if followers_edges:

for follower_edge in followers_edges:

follower_edge["classes"] = "followerEdge"

elements.extend(followers_edges)

elif expansion_mode == "following":

following_nodes = following_node_di.get(nodeData["id"])

following_edges = following_edges_di.get(nodeData["id"])

if following_nodes:

for node in following_nodes:

if node["data"]["id"] != genesis_node["data"]["id"]:

node["classes"] = "followingNode"

elements.append(node)

if following_edges:

for follower_edge in following_edges:

follower_edge["classes"] = "followingEdge"

elements.extend(following_edges)

return elements

if __name__ == "__main__":

app.run(debug=True)

dash-cytoscape/usage-elements.py at main · plotly/dash-cytoscape · GitHub

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