two_value_axes_in_polar.rs

use charming::{
    component::{AngleAxis, Legend, PolarCoordinate, RadiusAxis, Title},
    element::{AxisPointer, AxisPointerType, AxisType, CoordinateSystem, Tooltip, Trigger},
    series::Line,
    Chart,
};

pub fn chart() -> Chart {
    let data = (0..=360)
        .map(|i| {
            let t = i as f64 / 180.0 * std::f64::consts::PI;
            let r = (2.0 * t).sin() * (2.0 * t).cos();
            vec![r, i as f64]
        })
        .collect::<Vec<_>>();

    Chart::new()
        .title(Title::new().text("Two Value-Axes in Polar"))
        .legend(Legend::new().data(vec!["line"]))
        .polar(PolarCoordinate::new().center(vec!["50%", "54%"]))
        .tooltip(
            Tooltip::new()
                .trigger(Trigger::Axis)
                .axis_pointer(AxisPointer::new().type_(AxisPointerType::Cross)),
        )
        .angle_axis(AngleAxis::new().type_(AxisType::Value).start_angle(0))
        .radius_axis(RadiusAxis::new().min(0))
        .series(
            Line::new()
                .name("line")
                .coordinate_system(CoordinateSystem::Polar)
                .show_symbol(false)
                .data(data),
        )
}