Struct CoordTrans 

pub struct CoordTrans { /* private fields */ }

Transformed Cartesian coordinates (R’s coord_trans).

Unlike a scale transform (which transforms data before stats), this warps the coordinate space at draw time — stats are computed on the raw data but drawn on a non-linear axis. Data points, gridlines, and ticks all pass through transform, so they warp consistently and the tick labels keep their original (untransformed) values.

The trained data domain is supplied via Coord::set_domains during build, so the warp is faithful. If a transform is invalid over the domain (e.g. log10 with a non-positive minimum) the axis falls back to linear.

Implementations

impl CoordTrans

pub fn new(x: Option<ScaleTransform>, y: Option<ScaleTransform>) -> Self

Trait Implementations

impl Coord for CoordTrans

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

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

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.

fn gridlines(&self) -> bool

Whether to draw grid lines.

fn is_flipped(&self) -> bool

Whether this coordinate system flips X and Y.

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 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.