Positioning using screen points instead of xIndex

[alessandroorru]

Is it possible to scroll to a portion of the graph defined by a rect (or offset) in terms of screen points instead of data points?
I would like to position the viewport in a similar fashion of what I can do with a UIScrollView using the scrollToRect/scrollToOffset method.
The only scroll method I found is moveViewToX(xIndex: Int) but it needs data point, not screen points.

[liuxuan30]

Seems duplicate to #226
Feel free to reopen if not the same. In general, it requires you to manipulate the transformer, so far