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graphml_visualize.py
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import networkx as nx
import json
import os
import webbrowser
import http.server
import socketserver
import threading
# load GraphML file and transfer to JSON
def graphml_to_json(graphml_file):
G = nx.read_graphml(graphml_file)
data = nx.node_link_data(G)
return json.dumps(data)
# create HTML file
def create_html(html_path):
html_content = '''
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Graph Visualization</title>
<script src="https://d3js.org/d3.v7.min.js"></script>
<style>
body, html {
margin: 0;
padding: 0;
width: 100%;
height: 100%;
overflow: hidden;
}
svg {
width: 100%;
height: 100%;
}
.links line {
stroke: #999;
stroke-opacity: 0.6;
}
.nodes circle {
stroke: #fff;
stroke-width: 1.5px;
}
.node-label {
font-size: 12px;
pointer-events: none;
}
.link-label {
font-size: 10px;
fill: #666;
pointer-events: none;
opacity: 0;
transition: opacity 0.3s;
}
.link:hover .link-label {
opacity: 1;
}
.tooltip {
position: absolute;
text-align: left;
padding: 10px;
font: 12px sans-serif;
background: lightsteelblue;
border: 0px;
border-radius: 8px;
pointer-events: none;
opacity: 0;
transition: opacity 0.3s;
max-width: 300px;
}
.legend {
position: absolute;
top: 10px;
right: 10px;
background-color: rgba(255, 255, 255, 0.8);
padding: 10px;
border-radius: 5px;
}
.legend-item {
margin: 5px 0;
}
.legend-color {
display: inline-block;
width: 20px;
height: 20px;
margin-right: 5px;
vertical-align: middle;
}
</style>
</head>
<body>
<svg></svg>
<div class="tooltip"></div>
<div class="legend"></div>
<script type="text/javascript" src="./graph_json.js"></script>
<script>
const graphData = graphJson;
const svg = d3.select("svg"),
width = window.innerWidth,
height = window.innerHeight;
svg.attr("viewBox", [0, 0, width, height]);
const g = svg.append("g");
const entityTypes = [...new Set(graphData.nodes.map(d => d.entity_type))];
const color = d3.scaleOrdinal(d3.schemeCategory10).domain(entityTypes);
const simulation = d3.forceSimulation(graphData.nodes)
.force("link", d3.forceLink(graphData.links).id(d => d.id).distance(150))
.force("charge", d3.forceManyBody().strength(-300))
.force("center", d3.forceCenter(width / 2, height / 2))
.force("collide", d3.forceCollide().radius(30));
const linkGroup = g.append("g")
.attr("class", "links")
.selectAll("g")
.data(graphData.links)
.enter().append("g")
.attr("class", "link");
const link = linkGroup.append("line")
.attr("stroke-width", d => Math.sqrt(d.value));
const linkLabel = linkGroup.append("text")
.attr("class", "link-label")
.text(d => d.description || "");
const node = g.append("g")
.attr("class", "nodes")
.selectAll("circle")
.data(graphData.nodes)
.enter().append("circle")
.attr("r", 5)
.attr("fill", d => color(d.entity_type))
.call(d3.drag()
.on("start", dragstarted)
.on("drag", dragged)
.on("end", dragended));
const nodeLabel = g.append("g")
.attr("class", "node-labels")
.selectAll("text")
.data(graphData.nodes)
.enter().append("text")
.attr("class", "node-label")
.text(d => d.id);
const tooltip = d3.select(".tooltip");
node.on("mouseover", function(event, d) {
tooltip.transition()
.duration(200)
.style("opacity", .9);
tooltip.html(`<strong>${d.id}</strong><br>Entity Type: ${d.entity_type}<br>Description: ${d.description || "N/A"}`)
.style("left", (event.pageX + 10) + "px")
.style("top", (event.pageY - 28) + "px");
})
.on("mouseout", function(d) {
tooltip.transition()
.duration(500)
.style("opacity", 0);
});
const legend = d3.select(".legend");
entityTypes.forEach(type => {
legend.append("div")
.attr("class", "legend-item")
.html(`<span class="legend-color" style="background-color: ${color(type)}"></span>${type}`);
});
simulation
.nodes(graphData.nodes)
.on("tick", ticked);
simulation.force("link")
.links(graphData.links);
function ticked() {
link
.attr("x1", d => d.source.x)
.attr("y1", d => d.source.y)
.attr("x2", d => d.target.x)
.attr("y2", d => d.target.y);
linkLabel
.attr("x", d => (d.source.x + d.target.x) / 2)
.attr("y", d => (d.source.y + d.target.y) / 2)
.attr("text-anchor", "middle")
.attr("dominant-baseline", "middle");
node
.attr("cx", d => d.x)
.attr("cy", d => d.y);
nodeLabel
.attr("x", d => d.x + 8)
.attr("y", d => d.y + 3);
}
function dragstarted(event) {
if (!event.active) simulation.alphaTarget(0.3).restart();
event.subject.fx = event.subject.x;
event.subject.fy = event.subject.y;
}
function dragged(event) {
event.subject.fx = event.x;
event.subject.fy = event.y;
}
function dragended(event) {
if (!event.active) simulation.alphaTarget(0);
event.subject.fx = null;
event.subject.fy = null;
}
const zoom = d3.zoom()
.scaleExtent([0.1, 10])
.on("zoom", zoomed);
svg.call(zoom);
function zoomed(event) {
g.attr("transform", event.transform);
}
</script>
</body>
</html>
'''
with open(html_path, 'w', encoding='utf-8') as f:
f.write(html_content)
def create_json(json_data, json_path):
json_data = "var graphJson = " + json_data.replace('\\"', '').replace("'", "\\'").replace("\n", "")
with open(json_path, 'w', encoding='utf-8') as f:
f.write(json_data)
# start simple HTTP server
def start_server(port):
handler = http.server.SimpleHTTPRequestHandler
with socketserver.TCPServer(("", port), handler) as httpd:
print(f"Server started at http://localhost:{port}")
httpd.serve_forever()
# main function
def visualize_graphml(graphml_file, html_path, port=8000):
json_data = graphml_to_json(graphml_file)
html_dir = os.path.dirname(html_path)
if not os.path.exists(html_dir):
os.makedirs(html_dir)
json_path = os.path.join(html_dir, 'graph_json.js')
create_json(json_data, json_path)
create_html(html_path)
# start server in background
server_thread = threading.Thread(target=start_server(port))
server_thread.daemon = True
server_thread.start()
# open default browser
webbrowser.open(f'http://localhost:{port}/{html_path}')
print("Visualization is ready. Press Ctrl+C to exit.")
try:
# keep main thread running
while True:
pass
except KeyboardInterrupt:
print("Shutting down...")
# usage
if __name__ == "__main__":
graphml_file = r"nano_graphrag_cache_azure_openai_TEST\graph_chunk_entity_relation.graphml" # replace with your GraphML file path
html_path = "graph_visualization.html"
visualize_graphml(graphml_file, html_path, 11236)