<｜begin▁of▁sentence｜>### Instruction:
Given a tree graph with 3 children per node and height 2, can you use the CircleDrawer class from igraph's drawing module to draw a circular path on a Cairo context at a specified center point with a given width?
### Response:
import igraph as ig
from igraph.drawing import plot

# Create a simple undirected graph
g = ig.Graph.Tree(3, 2)

# Initialize a Plot object with the given Cairo backend
p = plot(g, bbox=(300, 300), margin=20)

# Get the Cairo context from the plot
context = p.context

# Create a CircleDrawer instance
circle_drawer = ig.drawing.shapes.CircleDrawer()

# Draw a circle on the Cairo context without stroking or filling it
# Assuming we are drawing a circle at center (150, 150) with diameter 100
center_x, center_y = 150, 150
width = 100
height = 0 # height is ignored
circle_drawer.draw_path(context, center_x, center_y, width, height)

# Display the plot with the new circle
display(p)
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