Feature request: Add editable data in plots

[PabloRuizCuevas]

The objective of this proposal is being able to redraw the plot without changing axis labels etc.

There are several ways of adding this feature, the one used in matplotlib is using an instance of a class, but as first draft I developed a simple generator that is able to do the same:

https://github.com/PabloRuizCuevas/uniplot/blob/master/uniplot/uniplot.py

    from uniplot import plot_gen
    plot_g = plot_gen(
        **{
            "lines": [True, True],
            "width": 180,
            "x_unit": "$",
            "y_unit": "$",
            "color": ["green", "red"],
        }
    )
    next(plot_g)
    args = {}
    plot_g.send(([1,2,3], [4,3,2], args)) # pass only data that changes.
    # the plot is plotted
    plot_g.send(([1,2,3], [2,3,2], args))
    # the plot is modified

With this structure we avoid creating a class for the plot, though it may be desirable to do so, I could also make a draft of that if you like it more.

[olavolav]

@PabloRuizCuevas I've been thinking about this in the context of how to make the library more flexible for different use cases, also how it relates to #23.

What I did for v0.16.0 is to add a plot_gen function that should essentially do what you need. I did run into issues with the generator functionality itself, so it's just a simple wrapper but should work. You can check out examples/5-streaming.py to see if this is what you need.

[PabloRuizCuevas]

@olavolav Just tested the functionality, it works perfectly! many thanks :)