<｜begin▁of▁sentence｜>### Instruction:
Given a complete graph with 5 vertices, can you use a subclass of AbstractCairoDrawer to draw the graph onto a 400x400 image surface using a circular layout and save the image to 'full_graph.png'?
### Response:
from igraph.drawing import BoundingBox
from igraph.drawing.cairo.graph import CairoGraphDrawer
import cairo

g = Graph.Full(5)

# Create a Cairo Image Surface to draw on
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 400, 400)
ctx = cairo.Context(surface)

# Define the bounding box
bbox = BoundingBox(400, 400)

# Instantiate a graph drawer
graph_drawer = CairoGraphDrawer(ctx, bbox=bbox)

# Drawing the graph
graph_drawer.draw(g, g.layout('circle'))

# Saving the image to a file
surface.write_to_png('full_graph.png')
<|EOT|>
