Struct lyon::bezier::QuadraticBezierSegment
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[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.