Can someone explain to me what this Python code does? Is it supposed to output something? Can you show me an example of the output? I'm enrolled in a course and am having trouble setting up Python, so I'm not sure what the output should look like. I am not looking for answers just explanation as to what this code does.

#!/usr/bin/env python import numpy as np import cv2 from matplotlib import pyplot as plt

import sys

refPt = [] image = np.zeros((512, 512, 3), np.uint8) windowName = 'HW Window'; lx = -1 ly = -1 def click_and_keep(event, x, y, flags, param): global refPt, image,lx,ly if event == cv2.EVENT_LBUTTONDOWN: refPt = [(x, y)] print (x,y) lx = x ly = y

def main(): image = cv2.imread('testimg.jpg',1); image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB) cv2.namedWindow(windowName) cv2.setMouseCallback(windowName,click_and_keep)

while True: image = cv2.circle(image,(lx,ly),10,(0,500,500),-1); cv2.imshow(windowName,image) key = cv2.waitKey(1) & 0xFF if key == ord("c"): break

cv2.destroyAllWindows()

if __name__ == '__main__': main()

#cv.Remap(src, dst, mapx, mapy, flags=CV_INTER_LINEAR+CV_WARP_FILL_OUTLIERS, fillval=(0, 0, 0, 0))