Struct RoundedRect 

pub struct RoundedRect { /* private fields */ }

Rounded rectangle vertex source.

Generates vertices for a rectangle where each corner can have its own elliptical radius. The corners are emitted as arcs (bottom-left, bottom-right, top-right, top-left) connected by line segments, forming a closed polygon.

Port of C++ agg::rounded_rect.

Implementations

impl RoundedRect

pub fn new(x1: f64, y1: f64, x2: f64, y2: f64, r: f64) -> Self

Create a new rounded rectangle with uniform corner radius.

pub fn default_new() -> Self

Create a default (zero-sized) rounded rectangle.

pub fn rect(&mut self, x1: f64, y1: f64, x2: f64, y2: f64)

Set the rectangle coordinates.

pub fn radius(&mut self, r: f64)

Set uniform corner radius.

pub fn radius_xy(&mut self, rx: f64, ry: f64)

Set corner radii with separate x/y values (uniform across corners).

pub fn radius_bottom_top( &mut self, rx_bottom: f64, ry_bottom: f64, rx_top: f64, ry_top: f64, )

Set corner radii for bottom and top edges.

pub fn radius_all( &mut self, rx1: f64, ry1: f64, rx2: f64, ry2: f64, rx3: f64, ry3: f64, rx4: f64, ry4: f64, )

Set each corner radius individually.

Corners are numbered 1-4 starting from bottom-left going clockwise: 1 = bottom-left, 2 = bottom-right, 3 = top-right, 4 = top-left.

pub fn normalize_radius(&mut self)

Normalize radii so they don’t exceed rectangle dimensions.

If the sum of adjacent corner radii exceeds the corresponding dimension, all radii are uniformly scaled down.

pub fn set_approximation_scale(&mut self, s: f64)

Set the approximation scale for arc generation.

pub fn approximation_scale(&self) -> f64

Get the current approximation scale.

Trait Implementations

impl VertexSource for RoundedRect

fn rewind(&mut self, _path_id: u32)

Reset the vertex source to the beginning of the given path. path_id selects which sub-path to iterate (0 for the first/only path).

fn vertex(&mut self, x: &mut f64, y: &mut f64) -> u32

Return the next vertex. Writes coordinates to x and y, returns a path command. Returns PATH_CMD_STOP when iteration is complete.