Improve web in Flask

Exists already a web project, I need to improved, some changes. [login to view URL] 1. (forget the code part, I just need improve the Flask part) 2. For Now just take 1 point, I need a route. for one clic, is start long/lat, and the second clic in the map, will be the finish long/lat. 3. the route or line between that points. will take a color for a fuction (that will be in utils/[login to view URL]) the fuction will generete a random number between 1 and 0, if is 1 the point of color will be green, if is 0, will be red. (every point is a step if you are "walking" with streeet view.