code snippet to create polygon from camera point

getsector.py

import cv2
import numpy as np

clickPt = []

def clickDetect(event, x, y, flags, param):
    global clickPt

    if event == cv2.EVENT_LBUTTONDOWN:
        clickPt = [(x, y)]
        
    elif event == cv2.EVENT_LBUTTONUP:
        # cv2.circle(image, clickPt[0], 5, (0,0,255), -1)
        clickPt.append((x, y))
        x=clickPt[0][0]
        y=clickPt[0][1]
        x1=clickPt[1][0]
        y1=clickPt[1][1]
        r=np.sqrt((x-x1)**2-(y-y1)**2)
        cv2.rectangle(img, (x+r, y), (x1-r, y1+r), (255, 255, 00), 2)
        cv2.imshow("image", image)


        print(clickPt) # this prints the two edge points of the line drawn
        coeffs = np.polyfit(clickPt[0], clickPt[1], 1) 
        print(coeffs) # prints the polynomial (1 degree here) coefficients
        print(f"y = \b{np.poly1d(coeffs)}") # prints the equation

image = cv2.imread('floorplan.jpeg')
cv2.namedWindow("image")
cv2.setMouseCallback("image", clickDetect)

while True:
    cv2.imshow("image", image)
    key = cv2.waitKey(1) & 0xFF

    if key == ord("q"):
        break