This is an onboarding tool I created for UBER drivers. An UBER driver's first ride can be a little nerve wracking (I know from personal experience). This tool walks the driver through a typical flow to prepare them for their first ride. It is more interactive than a video and will give them more confidence before hitting the road.
Tumblr has a very nice series of animations that happens when you enter the compose mode. I thought it would be interesting to recreate this in Proto.io to show others how to achieve these kind of effect in their own protototypes.
I have made a companion tutorial video where you can see exactly how I did it. This video is available here:
http://docs.proto.io/videos/recreating-tumblr-compose-animations-in-proto-io/
If you need to get the Y position of a vertically scrolling container, create a text box. Then on the container scroll trigger, set a variable that evaluates the numerical callback value from the event (Y position). Then add a callback that changes the text property of the text box by reading from the variable.