Struct Ellipse 

pub struct Ellipse { /* private fields */ }

Ellipse vertex generator.

Generates a closed polygon approximating an ellipse. The number of steps is either specified explicitly or calculated automatically from the approximation scale.

Port of C++ agg::ellipse.

Implementations

impl Ellipse

pub fn new(x: f64, y: f64, rx: f64, ry: f64, num_steps: u32, cw: bool) -> Self

Create a new ellipse with automatic step calculation.

pub fn default_new() -> Self

Create a default ellipse (unit circle at origin).

pub fn init( &mut self, x: f64, y: f64, rx: f64, ry: f64, num_steps: u32, cw: bool, )

Re-initialize with new parameters.

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

Set approximation scale (affects automatic step count).

Trait Implementations

impl VertexSource for Ellipse

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.