Diagram: Network

Network topology diagrams render hosts, switches, routers, clouds, firewalls, databases, wireless points, and more. Presets for bus, star, ring, mesh, and tree topologies are included.

Minimal example

import engrapha_notes as en
import engrapha_diagrams as ed

net = ed.NetworkDiagram(width=500, height=220, caption="Fig 8: LAN")

net.node("inet",  "Internet",   x=50,  y=110, kind="cloud")
net.node("fw",    "Firewall",   x=160, y=110, kind="firewall")
net.node("sw",    "Core Switch",x=270, y=110, kind="switch")
net.node("srv",   "Web Server", x=380, y=150, kind="server")
net.node("db",    "Database",   x=380, y=70,  kind="database")

net.link("inet", "fw")
net.link("fw",   "sw")
net.link("sw",   "srv")
net.link("sw",   "db")

en.add(net.as_flowable())

Node kinds

Kind	Shape
host / server / firewall / database / load_balancer / storage / custom	Rectangle
router	Hexagon
switch	Octagon
hub / generic	Circle
cloud	Cloud (path)
wireless	Antenna
printer	Printer
mobile	Phone
text	(no shape, label only)

Topology presets

net.star_topology(
    center_id="sw",
    center_label="Core Switch",
    spoke_ids=["h1", "h2", "h3"],
)

net.bus_topology(node_ids=["n1", "n2", "n3"])
net.ring_topology(node_ids=["r1", "r2", "r3", "r4"])
net.mesh_topology(node_ids=["m1", "m2", "m3", "m4"])
net.tree_topology(parent_child_map={"root": ["a", "b"]})

Labels

Set label_pos="auto" (default) for smart placement above or below. Override with:

net.node("sw", "Label", label_pos="right")

Links

net.link("sw", "srv", label="Gi0/1", bidirectional=True)

Bidirectional links draw a single line. bidirectional=False adds an arrowhead.

Custom node drawers

def my_drawer(diagram, cx, cy, w, h, fill, stroke):
    diagram._add(diagram.S.rounded_rect(
        cx - w/2, cy - h/2, w, h,
        rx=3, fill=fill, stroke=stroke
    ))

net.node("id", "Label", kind="custom", custom_draw=my_drawer)

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