Hello friends,
this extension is about drawing a dynamic graph, which scrolls to the left.

in this post we have a code to draw a dynamic graph:
https://groups.google.com/forum/#!categorytopic/mitappinventortest/generalquestionsaboutappinventorprogramming/fNQVDNGPIY 
In this topic I simplified that code and made several examples:
Dynamic graph. Sinusoidal wave. Shift left graph 
Now this extension performs the same effect.
Blocks:

You can download the extension from:
http://kio4.com/appinventor/299H_extension_GraficoDinamico.htm 
Updated 2021/11/23