Struct Arrowhead 

pub struct Arrowhead { /* private fields */ }

Arrowhead / arrowtail vertex generator.

Generates arrow marker polygons. Path ID 0 = tail, path ID 1 = head. The arrow shape is defined by four parameters (d1-d4) for each end.

Port of C++ agg::arrowhead.

Implementations

impl Arrowhead

pub fn new() -> Self

Create a new arrowhead with default dimensions.

pub fn head(&mut self, d1: f64, d2: f64, d3: f64, d4: f64)

Set head arrow dimensions and enable head.

pub fn enable_head(&mut self)

Enable head arrow (uses current dimensions).

pub fn no_head(&mut self)

Disable head arrow.

pub fn tail(&mut self, d1: f64, d2: f64, d3: f64, d4: f64)

Set tail arrow dimensions and enable tail.

pub fn enable_tail(&mut self)

Enable tail arrow (uses current dimensions).

pub fn no_tail(&mut self)

Disable tail arrow.

Trait Implementations

impl Default for Arrowhead

fn default() -> Self

Returns the “default value” for a type.

impl VertexSource for Arrowhead

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.