Struct lyon::bezier::QuadraticBezierSegment [−] [src]

pub struct QuadraticBezierSegment {
    pub from: TypedPoint2D<f32, UnknownUnit>,
    pub ctrl: TypedPoint2D<f32, UnknownUnit>,
    pub to: TypedPoint2D<f32, UnknownUnit>,
}

A 2d curve segment defined by three points: the beginning of the segment, a control point and the end of the segment.

The curve is defined by equation: ∀ t ∈ [0..1], P(t) = (1 - t)² * from + 2 * (1 - t) * t * ctrl + 2 * t * to

Fields

from: TypedPoint2D<f32, UnknownUnit> ctrl: TypedPoint2D<f32, UnknownUnit> to: TypedPoint2D<f32, UnknownUnit>

Methods

`impl QuadraticBezierSegment`

`fn sample(&self, t: f32) -> TypedPoint2D<f32, UnknownUnit>`

Sample the curve at t (expecting t between 0 and 1).

`fn sample_x(&self, t: f32) -> f32`

Sample the x coordinate of the curve at t (expecting t between 0 and 1).

`fn sample_y(&self, t: f32) -> f32`

Sample the y coordinate of the curve at t (expecting t between 0 and 1).

`fn flip(&mut self)`

Swap the beginning and the end of the segment.

`fn find_y_maximum(&self) -> f32`

Find the advancement of the y-most position in the curve.

This returns the advancement along the curve, not the actual y position.

`fn find_y_inflection(&self) -> Option<f32>`

Return the y inflection point or None if this curve is y-monotone.

`fn split(&self, t: f32) -> (QuadraticBezierSegment, QuadraticBezierSegment)`

Split this curve into two sub-curves.

`fn before_split(&self, t: f32) -> QuadraticBezierSegment`

Return the curve before the split point.

`fn after_split(&self, t: f32) -> QuadraticBezierSegment`

Return the curve after the split point.

`fn to_cubic(&self) -> CubicBezierSegment`

Elevate this curve to a third order bezier.

`fn flattening_step(&self, tolerance: f32) -> f32`

Find the interval of the begining of the curve that can be approximated with a line segment.

`fn flattened_for_each<F>(&self, tolerance: f32, call_back: &mut F) where F: FnMut(TypedPoint2D<f32, UnknownUnit>) -> ()`

Iterates through the curve invoking a callback at each point.

`fn flattening_iter(&self, tolerance: f32) -> QuadraticFlatteningIter`

Returns the flattened representation of the curve as an iterator, starting after the current point.