Struct CoordRadar 

pub struct CoordRadar {
    pub start: f64,
    pub radius_frac: f64,
    /* private fields */
}

Radar / spider-chart coordinates (coord_radar()).

x (usually discrete — one spoke per level) maps to angle, with the first level at 12 o’clock and levels running clockwise; y maps to the distance from the centre, which is the y scale’s value 0 (the y scale is trained to include 0). Geoms connect points with straight segments: geom_polygon draws closed, filled series polygons and geom_line closes its path. Gridlines become rings (polygons through the spokes at the y breaks) and spokes, with the x levels labelled around the outside.

Fields

start: f64

Angle of the first spoke (radians, 0 = 12 o’clock, clockwise).

radius_frac: f64

Outer radius as a fraction of half the panel’s smaller side; the rest is left for the spoke labels.

Implementations

impl CoordRadar

pub fn new() -> Self

pub fn start(self, start: f64) -> Self

Rotate the first spoke to start radians (0 = 12 o’clock).

pub fn radius_frac(self, frac: f64) -> Self

Outer radius as a fraction of half the panel’s smaller side.

Trait Implementations

impl Coord for CoordRadar

fn transform(&self, (nx, ny): (f64, f64), plot_area: &Rect) -> (f64, f64)

Transform normalized (0..1, 0..1) coordinates to pixel coordinates.

fn gridlines(&self) -> bool

Whether to draw grid lines.

fn is_polar(&self) -> bool

Whether this is a non-linear polar system (bars become radial sectors, so geoms that draw rectangles must tessellate their edges into an arc).

fn is_radar(&self) -> bool

Radar coordinates: straight segments between spokes, closed paths, and ring/spoke guides instead of cartesian axes. Default false.

fn train_scales(&mut self, scales: &mut ScaleSet)

Inspect / adjust the trained scales once training is complete (e.g. coord_radar anchors the radius at 0 and counts its spokes). Default: no-op.

fn is_flipped(&self) -> bool

Whether this coordinate system flips X and Y.

fn polar_theta_is_x(&self) -> bool

For a polar system, whether the x aesthetic maps to angle (theta="x"). When false (theta="y", pies), the y aesthetic is the angle, so sector tessellation must sweep the y edge instead of the x edge.

fn zoom_x(&self) -> Option<(f64, f64)>

Zoom limits for x-axis (data coordinates). Clips viewport without filtering data.

fn zoom_y(&self) -> Option<(f64, f64)>

Zoom limits for y-axis (data coordinates). Clips viewport without filtering data.

fn set_domains(&mut self, _x: Option<AxisSpan>, _y: Option<AxisSpan>)

Supply the trained x/y axis spans after scale training. Coordinate systems that warp the axis (e.g. coord_trans) need this to map a normalized position back to a data value. Default is a no-op.

impl Default for CoordRadar

fn default() -> Self

Returns the “default value” for a type.