change parameter

app.py

@@ -15,8 +15,8 @@ def drawAxis(img, p_, q_, color, scale):
   hypotenuse = sqrt((p[1] - q[1]) * (p[1] - q[1]) + (p[0] - q[0]) * (p[0] - q[0]))
  
   # Here we lengthen the arrow by a factor of scale
-  q[0] = p[0] - scale * hypotenuse/3 * cos(angle)
-  q[1] = p[1] - scale * hypotenuse/3 * sin(angle)
+  q[0] = p[0] - scale * hypotenuse/2 * cos(angle)
+  q[1] = p[1] - scale * hypotenuse/2 * sin(angle)
   cv2.line(img, (int(p[0]), int(p[1])), (int(q[0]), int(q[1])), color, 3, cv2.LINE_AA)
  
   # create the arrow hooks