<｜begin▁of▁sentence｜>### Instruction:
As a laboratory technician working in a research facility, you are tasked with generating a visual representation of a polygon using data from a set of points. To achieve this, you need to utilize Cairo, a 2D graphics library, and igraph, a network analysis package. By leveraging these tools, you'll be able to create a PNG file that accurately depicts the polygon defined by the given set of points. This visual representation will aid in the analysis and communication of the geometric relationships within the polygon.
### Response:
import igraph as ig
import cairo

# Initialize a Cairo surface and context
drawer = ig.drawing.PolygonDrawer()
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 200, 200)
context = cairo.Context(surface)

# Define points of the polygon to be drawn
polygon_points = [(50, 50), (150, 50), (150, 150), (50, 150)]

# Set up drawing context
context.set_line_width(2)
context.set_source_rgb(0.1, 0.2, 0.3) # Dark blue color

# Draw the polygon using the points defined
drawer.draw(context, polygon_points)

# Finalize the drawing and write it to a file
surface.write_to_png('polygon.png')
<|EOT|>
