feat: add four point selector for image transformation

src/four_points_selector.py

@@ -0,0 +1,35 @@
+from transform import four_point_transform
+import cv2
+import numpy as np
+
+# Output: coordinates of four points as np.array
+def four_point_selector(img):
+    # four points in python array
+    pts=[]
+    def click_event(event, x, y, flags, params):
+        # checking for left mouse clicks
+        if event == cv2.EVENT_LBUTTONDOWN:
+            pts.append([x, y])
+            # displaying the coordinates 
+            # on the image window 
+            font = cv2.FONT_HERSHEY_SIMPLEX 
+            cv2.putText(img, str(x) + ',' + str(y), (x,y), font, 1, (255, 0, 0), 2) 
+            cv2.circle(img, (x,y), 6, (0, 0, 255), 2) 
+            cv2.imshow('image', img)
+
+
+    # displaying the image 
+    cv2.imshow('image', img) 
+
+    # setting mouse handler 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)
+
+    cv2.destroyAllWindows
+    return np.array(pts)
+
+img = cv2.imread('public/sample-desktop-1.jpg', 1) 
+print(four_point_selector(img))