Draw Lines on top of an image

drawLines.py

#!/usr/bin/env python

# sudo apt-get install python-pygame
import pygame
from os.path import basename

def drawCoordinates(filepath, coordinates):
    # Load image
    surface = pygame.image.load(filepath)
    # Convert and preserve alpha values so that colors make sense
    surface = surface.convert_alpha()
    # Params
    isClosed = 2 
    thickness = 4 
    color = pygame.Color("#589442")
    # Draw lines
    pygame.draw.lines(surface, color, isClosed, coordinates, thickness)
    # Write file
    opFileName = basename(filename).split(".")[0] + "_line.png"
    pygame.image.save(surface, opFileName)

if __name__ == "__main__":
    filename = "./560x1460.png"
    # Dummy code to initialize pygame display
    pygame.display.set_mode((1, 1)) 
    coordinates = [(200, 200), (200, 500), (400, 500), (400, 200)]
    drawCoordinates(filename, coordinates)