X-axis numbers and putting frequency information on the chart

[shabaz123]

Hello,

Great project. I've written a short Python program that plots a .s1p file using SmithAxes from mpl-smithchart.

The result I get:

The Smith Chart result is excellent, however I had a couple of questions.

(1) The x-axis label values have values 0, 0.1, 0.3, 0.6, 1, 1.5, 2.4 and so on. Is it possible to change that to be more granular, so that values of 0.5 and 2 are also included? Ideally I'm looking for this level of granularity, but don't mind if it is a bit less:

(2) What's the best way to put frequency information on the chart? I'd be happy with any one of the following:
(a) Shapes (e.g. circle and cross) on the start and end of the plotted curve, and equal distance (or step) dots on the curve,
(b) Ability to drop a marker with a label anywhere on the curve
(c) Ability to drag a cursor that sits on the curve
For (a), I have tried to use the update_scParam function (on line 25 of my code), but I don't see an 'o' and 'x' at the start and end of the generated chart. For (b) and (c) I was wondering if you had any suggestions; I'm just a Python beginner so any pointers would be appreciated. I tried an attempt at (c) using a SnappingCursor example on the matplotlib website, my Python attempt is here. It fails on line 87 due to this:

Traceback (most recent call last):
  File "C:\development\smith_chart\plot_s1p.py", line 87, in <module>
    snap_cursor = SnappingCursor(ax, line)
                  ^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\development\smith_chart\plot_s1p.py", line 30, in __init__
    self.x, self.y = line.get_data()
                     ^^^^^^^^^^^^^
AttributeError: 'list' object has no attribute 'get_data'

Many thanks for all your help.