How this is integrated with leaflet draw

Below link says leaflet draw is integrated with contact form 7 plugin.
how does it work? I am looking for a way for user to draw markers, route and save or email the map from front end.

http://www.gaiaresources.com.au/drawing-features-leaflet-using-leaflet-draw-plugin/

https://wordpress.org/plugins/contact-form-7/