How to get the shortest path between two points in google maps

Question

I dont know if this is google's proprietary thing or its opensource. I need to know the way google does show the different routes and also the shortest of them based on available roadway. Because I have created an google maps app where user can put a marker and so get the simplest(shortest in my sense) to the destination with the available roads(not just the line as this Q shows (Google MAP API: How to draw shortest plane path between two geo-points?)

I know that this relates to Dijkstra's algorithm for the shortest path. but I was wondering if there is some library which I can use out-of-the-box.

Thanks,

Solution

Sounds like you just want to find the directions from one point to another?

This is provided in the google maps API.

Documentation