How to get coordinates from time for rectangle draw

[lobneroO]

I'm rewriting one of my python programs which basically creates a timetable. Y axis is date / time and X axis are arbitrary strings to which data belongs.
The data are rectangles with information written into them

I'm trying to recreate the behaviour with plotters-rs. I have gotten a plot based on time (though the labels show no actual differences, haven't looked into that yet) and names. The box int he upper left corner was just a (0, 0), (100, 100) test drawing of a rectangle.

Now I want to draw the rectangles into them, but I don't know how to get the coordinates for drawing from the char.

The y axis start and end are set thus:

let stages = [ "Main Stage", "T Stage", "Wera Rebel Stage", "Campsite Circus Stage" ];
let first_band_start = 
    NaiveDate::from_ymd_opt(2024, 8, 15)
        .unwrap()
        .and_hms_opt(6, 0, 0)
        .unwrap().and_utc();
let last_band_end = 
    NaiveDate::from_ymd_opt(2024, 8, 15)
        .unwrap()
        .and_hms_opt(11, 59, 0)
        .unwrap().and_utc();

//...
drawing_area.fill(&WHITE).unwrap();
let mut chart = ChartBuilder::on(&drawing_area)
    .caption(current_day, ("Arial", 30))
    .set_label_area_size(LabelAreaPosition::Left, 40)
    .set_label_area_size(LabelAreaPosition::Bottom, 60)
    // the x axis are the sages. we want the names centered
    // on an entry (i.e. it starts with half in front of a segment
    // and ends half after a segment, rather than matching segments 
    // exactle)
    // ----|---------------|-------------|-------
    //   main stage     t stage      wera stage 
    // for that behaviour, we need the into_segmented() command
    .build_cartesian_2d(stages.into_segmented(), first_band_start..last_band_end)
    .unwrap();

I have data something along the lines of

let d1 = NaiveDate::from_ymd_opt(2024, 8, 15).unwrap().and_hms_opt(17, 20, 0).unwrap().and_utc(); 
let d2 = NaiveDate::from_ymd_opt(2024, 8, 15).unwrap().and_hms_opt(18, 30, 0).unwrap().and_utc(); 

And the rectangle should be from d1 to d2 (in y axis) and span most of the space from one element to the next (in x axis), as can be seen in the first screenshot.

So, how can I get the correct x and y coordinates?

[lobneroO]

I made some progress, this draws somewhat reasonable rectangles

    chart.draw_series(
        bands.iter().map(|band| {
            Rectangle::new(
                [
                    (SegmentValue::Exact(&band.stage), band.start_dt.and_utc()),
                    (SegmentValue::CenterOf(&band.stage), band.end_dt.and_utc()),
                ],
                Into::<ShapeStyle>::into(BLACK).filled()
            )
        })
    )
    .unwrap();

However, between all the lifetime problems when trying to draw some things, bugs and lack of any support I cannot recommend using this crate at the moment :(