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app.py
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import json
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import random
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import streamlit as st
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import streamlit.components.v1 as components
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# --- CONFIGURATION -------------------------------------------------------------
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HEIGHT = 600
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DEFAULT_NODES = 10
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DEFAULT_EDGES = 12
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# --- HELPER FUNCTIONS ----------------------------------------------------------
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def random_rgb():
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return "#{:02x}{:02x}{:02x}".format(
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random.randint(50, 200),
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random.randint(50, 200),
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random.randint(50, 200)
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)
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def build_cytoscape_elements(n_nodes, n_edges):
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"""Return Cytoscape-compatible elements JSON."""
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nodes = [{"data": {"id": str(i), "label": f"Node {i}"}} for i in range(n_nodes)]
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edges = [
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{
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"data": {
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"id": f"{u}-{v}",
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"source": str(u),
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"target": str(v),
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"weight": random.randint(1, 5),
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}
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}
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for u, v in [random.sample(range(n_nodes), 2) for _ in range(n_edges)]
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]
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return nodes + edges
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def build_html(elements_json, height):
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"""Return complete HTML/JS string for standalone Cytoscape viewer."""
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return f"""
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8" />
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<script src="https://unpkg.com/[email protected]/dist/cytoscape.min.js"></script>
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<script src="https://unpkg.com/[email protected]/cytoscape-dagre.js"></script>
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<style>
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html, body {{ margin: 0; height: 100%; }}
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#cy {{ width: 100%; height: {height}px; border: 1px solid #ccc; }}
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</style>
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</head>
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<body>
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<div id="cy"></div>
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<script>
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const elements = {elements_json};
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const cy = cytoscape({{
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container: document.getElementById('cy'),
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elements: elements,
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style: [
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{{
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selector: 'node',
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style: {{
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'label': 'data(label)',
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'background-color': '{random_rgb()}',
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'text-valign': 'center',
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'color': '#fff',
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'font-size': 12
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}}
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}},
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{{
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selector: 'edge',
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style: {{
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'width': 'mapData(weight, 1, 5, 1, 5)',
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'line-color': '#ccc',
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'target-arrow-color': '#ccc',
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'target-arrow-shape': 'triangle'
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}}
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}}
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],
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layout: {{ name: 'dagre', directed: true }}
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}});
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</script>
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</body>
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</html>
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"""
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# --- STREAMLIT UI --------------------------------------------------------------
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st.set_page_config(page_title="Cytoscape + Streamlit Demo", layout="wide")
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st.title("Cytoscape Network Viewer in Streamlit")
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with st.sidebar:
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st.header("Controls")
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n_nodes = st.slider("Nodes", 3, 50, DEFAULT_NODES)
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n_edges = st.slider("Edges", max(1, n_nodes - 1), 100, DEFAULT_EDGES)
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if st.button("Regenerate"):
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st.cache_data.clear()
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# --- RENDER CYTOSCAPE ----------------------------------------------------------
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elements = build_cytoscape_elements(n_nodes, n_edges)
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html = build_html(json.dumps(elements), HEIGHT)
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components.html(html, height=HEIGHT)
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