Struct lyon::bezier::QuadraticBezierSegment
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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 * t² * to
Fields
from: TypedPoint2D<f32, UnknownUnit>
ctrl: TypedPoint2D<f32, UnknownUnit>
to: TypedPoint2D<f32, UnknownUnit>
Methods
impl QuadraticBezierSegment
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fn sample(&self, t: f32) -> TypedPoint2D<f32, UnknownUnit>
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Sample the curve at t (expecting t between 0 and 1).
fn sample_x(&self, t: f32) -> f32
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Sample the x coordinate of the curve at t (expecting t between 0 and 1).
fn sample_y(&self, t: f32) -> f32
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Sample the y coordinate of the curve at t (expecting t between 0 and 1).
fn sample_derivative(&self, t: f32) -> TypedVector2D<f32, UnknownUnit>
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Sample the curve's derivative at t (expecting t between 0 and 1).
fn sample_x_derivative(&self, t: f32) -> f32
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Sample the x coordinate of the curve's derivative at t (expecting t between 0 and 1).
fn sample_y_derivative(&self, t: f32) -> f32
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Sample the y coordinate of the curve's derivative at t (expecting t between 0 and 1).
fn flip(&mut self)
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Swap the beginning and the end of the segment.
fn find_y_maximum(&self) -> f32
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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_minimum(&self) -> f32
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Find the advancement of the y-least position in the curve.
This returns the advancement along the curve, not the actual y position.
fn find_local_y_extremum(&self) -> Option<f32>
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Return the y inflection point or None if this curve is y-monotone.
fn find_x_maximum(&self) -> f32
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Find the advancement of the x-most position in the curve.
This returns the advancement along the curve, not the actual x position.
fn find_x_minimum(&self) -> f32
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Find the advancement of the x-least position in the curve.
This returns the advancement along the curve, not the actual x position.
fn find_local_x_extremum(&self) -> Option<f32>
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Return the x inflection point or None if this curve is x-monotone.
fn split(&self, t: f32) -> (QuadraticBezierSegment, QuadraticBezierSegment)
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Split this curve into two sub-curves.
fn before_split(&self, t: f32) -> QuadraticBezierSegment
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Return the curve before the split point.
fn after_split(&self, t: f32) -> QuadraticBezierSegment
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Return the curve after the split point.
fn to_cubic(&self) -> CubicBezierSegment
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Elevate this curve to a third order bézier.
fn transform(
&self,
transform: &TypedTransform2D<f32, UnknownUnit, UnknownUnit>
) -> QuadraticBezierSegment
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&self,
transform: &TypedTransform2D<f32, UnknownUnit, UnknownUnit>
) -> QuadraticBezierSegment
Applies the transform to this curve and returns the results.
fn flattening_step(&self, tolerance: f32) -> f32
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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>) -> (),
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F: FnMut(TypedPoint2D<f32, UnknownUnit>) -> (),
Iterates through the curve invoking a callback at each point.
fn flattened(&self, tolerance: f32) -> Flattened
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Returns the flattened representation of the curve as an iterator, starting after the current point.
fn compute_length(&self, tolerance: f32) -> f32
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Compute the length of the segment using a flattened approximation.
fn bounding_triangle(&self) -> Triangle
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Returns a triangle containing this curve segment.
fn bounding_rect(&self) -> TypedRect<f32, UnknownUnit>
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Returns a rectangle the curve is contained in
fn minimum_bounding_rect(&self) -> TypedRect<f32, UnknownUnit>
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Returns the smallest rectangle the curve is contained in
fn assume_x_montone(&self) -> XMonotoneQuadraticBezierSegment
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Cast this curve into a x-montone curve without checking that the monotonicity assumption is correct.
fn assume_y_montone(&self) -> YMonotoneQuadraticBezierSegment
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Cast this curve into a y-montone curve without checking that the monotonicity assumption is correct.
fn line_intersections(
&self,
line: &Line
) -> ArrayVec<[TypedPoint2D<f32, UnknownUnit>; 2]>
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&self,
line: &Line
) -> ArrayVec<[TypedPoint2D<f32, UnknownUnit>; 2]>
fn line_segment_intersections(
&self,
segment: &LineSegment
) -> ArrayVec<[TypedPoint2D<f32, UnknownUnit>; 2]>
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&self,
segment: &LineSegment
) -> ArrayVec<[TypedPoint2D<f32, UnknownUnit>; 2]>