Mouseclick angle detection.py

# importing the module
import cv2
import numpy as np
# function to display the coordinates of the points clicked on the image
angles=[]
lst=[]
def next(s,x,y):
    s= np.array([x,y])
    lst.append(s)
    #print(lst)
    #print('s=',s)
def calc_angle(a,b,c):
    # lst[0]=a
    # lst[1]=b
    # lst[2]=c
    ba = a - b
    bc = c - b

    cosine_angle = np.dot(ba, bc) / (np.linalg.norm(ba) * np.linalg.norm(bc))
    angle = np.arccos(cosine_angle)

    return round(np.degrees(angle))
    
def click_event(event, x, y, flags, params):

    # checking for left mouse clicks
    if event == cv2.EVENT_LBUTTONDOWN:
        next('s',x,y)
        font = cv2.FONT_HERSHEY_SIMPLEX
        cv2.putText(img, str(x) + ',' +
                    str(y), (x,y), font,
                    1, (255, 0, 0), 2)
        cv2.imshow('image', img)
        
    # checking for right mouse clicks   
    if event==cv2.EVENT_RBUTTONDOWN:
        font = cv2.FONT_HERSHEY_SIMPLEX
        b = img[y, x, 0]
        g = img[y, x, 1]
        r = img[y, x, 2]
        cv2.putText(img, str(b) + ',' +str(g) + ',' + str(r),(x,y), font, 1,(255, 255, 0), 2)
        cv2.imshow('image', img)

# driver function
if __name__=="__main__":

    # reading the image
    img = cv2.imread('assets/q3.png', 1)

    # displaying the image
    cv2.imshow('image',img)

    # setting mouse hadler for the image
    # and calling the click_event() function
    
    cv2.setMouseCallback('image', click_event)
    # wait for a key to be pressed to exit
    cv2.waitKey(0)
    for i in range(0,3):
                angles.append(calc_angle(lst[0],lst[1],lst[2]))
    # close the window
    cv2.destroyAllWindows()
    print(angles)