map2fig 0.7.8

Fast, publication-quality HEALPix sky map visualization in Rust
Documentation 
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use std::str::FromStr;

use map2fig::{NegMode, PixelValue, RgbaArg, cli::InputColor, generate_index_map};

use map2fig::scale::{Scale, scale_value};

/// ----------------------------
/// Test RGBAArg parsing
/// ----------------------------
#[test]
fn test_rgbaarg_from_str() {
    let rgba = RgbaArg::from_str("10,20,30,40").unwrap();
    assert_eq!((rgba.r, rgba.g, rgba.b, rgba.a), (10, 20, 30, 40));

    assert!(RgbaArg::from_str("10,20,30").is_err());
    assert!(RgbaArg::from_str("a,b,c,d").is_err());
}

/// ----------------------------
/// Test InputColor parsing
/// ----------------------------
#[test]
fn test_bad_color_parse() {
    assert!(matches!(
        InputColor::from_str("gray").unwrap(),
        InputColor::Gray
    ));
    assert!(matches!(
        InputColor::from_str("grey").unwrap(),
        InputColor::Gray
    ));
    assert!(matches!(
        InputColor::from_str("255,128,0,255").unwrap(),
        InputColor::Rgba(255, 128, 0, 255)
    ));
}

/// ----------------------------
/// Test HEALPix map generation
/// ----------------------------
#[test]
fn test_generate_index_map() {
    let map = generate_index_map(2);
    assert_eq!(map.len(), 12 * 2 * 2); // nside=2 -> 48 pixels
}

/// ----------------------------
/// Test scale_value transformations
/// ----------------------------
#[test]
fn test_scale_value_transformations() {
    let min = 1.0;
    let max = 100.0;

    // Linear scale
    let t = scale_value(50.0, min, max, Scale::Linear, NegMode::Zero, None, None);
    match t {
        PixelValue::Color(c) => assert!((c - 0.4949).abs() < 1e-3),
        _ => panic!(),
    }

    // Log scale
    let t = scale_value(10.0, min, max, Scale::Log, NegMode::Zero, None, None);
    match t {
        PixelValue::Color(c) => assert!((c - 0.5).abs() < 1e-3),
        _ => panic!(),
    }

    // Asinh scale
    let t = scale_value(
        50.0,
        min,
        max,
        Scale::Asinh { scale: 10.0 },
        NegMode::Zero,
        None,
        None,
    );
    match t {
        PixelValue::Color(c) => assert!(c > 0.0 && c < 1.0),
        _ => panic!(),
    }
}

/// ----------------------------
/// Test neg_mode handling
/// ----------------------------
#[test]
fn test_neg_mode_behavior() {
    let min = 1.0;
    let max = 10.0;

    // Negative value with Zero mode
    let t = scale_value(-5.0, min, max, Scale::Linear, NegMode::Zero, None, None);
    match t {
        PixelValue::Color(c) => assert_eq!(c, 0.0),
        _ => panic!(),
    }
}

#[test]
fn test_plot_smoke() {
    use map2fig::healpix::{HealpixMeta, HealpixOrdering};
    use map2fig::params::{
        ColorParams, DisplayParams, GraticuleParams, MollweideParams, PlotData, ScaleParams,
    };
    use map2fig::rotation::{CoordSystem, ViewTransform};

    let map = map2fig::generate_index_map(1);
    let cmap = map2fig::get_colormap("viridis");
    let meta = HealpixMeta {
        ordering: HealpixOrdering::Ring,
        nside: 1,
        coord: CoordSystem::G,
    };
    let input = CoordSystem::G;
    let output = CoordSystem::G;
    let rot = None;
    let view = ViewTransform::new(input, output, rot);

    let params = MollweideParams {
        plot: PlotData {
            map: map.clone(),
            width: 32,
            filename: "smoke.png".to_string(),
            pdf_backend: "cairo".to_string(),
        },
        scale: ScaleParams {
            minv: None,
            maxv: None,
            gamma: 1.0,
            scale: map2fig::scale::Scale::Linear,
            neg_mode: map2fig::NegMode::Zero,
        },
        color: ColorParams {
            cmap,
            bad_color: image::Rgba([0, 0, 0, 0]),
            bg_color: image::Rgba([0, 0, 0, 0]),
        },
        display: DisplayParams {
            show_colorbar: false,
            transparent: true,
            draw_border: false,
            latex_rendering: false,
            units: Some("str".to_string()),
            extend: map2fig::cli::Extend::None,
            tick_direction: map2fig::cli::TickDirection::Inward,
            tick_font_size: None,
            units_font_size: None,
            llabel: None,
            rlabel: None,
            label_font_size: None,
            mask: None,
            title: None,
            show_title: true,
            scale_text: true,
        },
        graticule: GraticuleParams {
            show_graticule: false,
            grat_coord: None,
            grat_overlay: None,
            overlay_color: image::Rgba([255, 255, 0, 200]),
            show_labels: false,
            dpar_deg: 15.0,
            dmer_deg: 15.0,
        },
        meta,
        view: &view,
    };

    map2fig::plot_mollweide_png(params);
}