Scrolling update on phat

so i got a pi zero wifi and an inky phat (given). And i got it all to work , i mean the pi and the phat examples.

But i noticed they do flash a lot, and i want to have a graph, updated every second or so. I am fine with the graph data wrapping around, in which case i would only have to draw a single line, or possibly just two points per 1-5 seconds.

But reading the examples, i see that always the whole image is drawn. So my question is, is there a way to incrementally update the display ?