Struct bevy::prelude::CubicBezier
source · pub struct CubicBezier<P>where
P: Point,{ /* private fields */ }
Expand description
A spline composed of a single cubic Bezier curve.
Useful for user-drawn curves with local control, or animation easing. See
CubicSegment::new_bezier
for use in easing.
§Interpolation
The curve only passes through the first and last control point in each set of four points.
§Tangency
Manually defined by the two intermediate control points within each set of four points.
§Continuity
At minimum C0 continuous, up to C2. Continuity greater than C0 can result in a loss of local control over the spline due to the curvature constraints.
§Usage
let points = [[
vec2(-1.0, -20.0),
vec2(3.0, 2.0),
vec2(5.0, 3.0),
vec2(9.0, 8.0),
]];
let bezier = CubicBezier::new(points).to_curve();
let positions: Vec<_> = bezier.iter_positions(100).collect();
Implementations§
source§impl<P> CubicBezier<P>where
P: Point,
impl<P> CubicBezier<P>where
P: Point,
sourcepub fn new(control_points: impl Into<Vec<[P; 4]>>) -> CubicBezier<P>
pub fn new(control_points: impl Into<Vec<[P; 4]>>) -> CubicBezier<P>
Create a new cubic Bezier curve from sets of control points.
Examples found in repository?
examples/animation/cubic_curve.rs (line 36)
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fn setup(
mut commands: Commands,
mut meshes: ResMut<Assets<Mesh>>,
mut materials: ResMut<Assets<StandardMaterial>>,
) {
// Define your control points
// These points will define the curve
// You can learn more about bezier curves here
// https://en.wikipedia.org/wiki/B%C3%A9zier_curve
let points = [[
vec3(-6., 2., 0.),
vec3(12., 8., 0.),
vec3(-12., 8., 0.),
vec3(6., 2., 0.),
]];
// Make a CubicCurve
let bezier = CubicBezier::new(points).to_curve();
// Spawning a cube to experiment on
commands.spawn((
PbrBundle {
mesh: meshes.add(Cuboid::default()),
material: materials.add(Color::ORANGE),
transform: Transform::from_translation(points[0][0]),
..default()
},
Curve(bezier),
));
// Some light to see something
commands.spawn(PointLightBundle {
point_light: PointLight {
shadows_enabled: true,
intensity: 10_000_000.,
range: 100.0,
..default()
},
transform: Transform::from_xyz(8., 16., 8.),
..default()
});
// ground plane
commands.spawn(PbrBundle {
mesh: meshes.add(Plane3d::default().mesh().size(50., 50.)),
material: materials.add(Color::SILVER),
..default()
});
// The camera
commands.spawn(Camera3dBundle {
transform: Transform::from_xyz(0., 6., 12.).looking_at(Vec3::new(0., 3., 0.), Vec3::Y),
..default()
});
}
Trait Implementations§
source§impl<P> CubicGenerator<P> for CubicBezier<P>where
P: Point,
impl<P> CubicGenerator<P> for CubicBezier<P>where
P: Point,
source§fn to_curve(&self) -> CubicCurve<P>
fn to_curve(&self) -> CubicCurve<P>
Build a
CubicCurve
by computing the interpolation coefficients for each curve segment.Auto Trait Implementations§
impl<P> Freeze for CubicBezier<P>
impl<P> RefUnwindSafe for CubicBezier<P>
impl<P> Send for CubicBezier<P>
impl<P> Sync for CubicBezier<P>
impl<P> Unpin for CubicBezier<P>
impl<P> UnwindSafe for CubicBezier<P>
Blanket Implementations§
source§impl<T, U> AsBindGroupShaderType<U> for T
impl<T, U> AsBindGroupShaderType<U> for T
source§fn as_bind_group_shader_type(&self, _images: &RenderAssets<Image>) -> U
fn as_bind_group_shader_type(&self, _images: &RenderAssets<Image>) -> U
Return the
T
ShaderType
for self
. When used in AsBindGroup
derives, it is safe to assume that all images in self
exist.source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
source§impl<T> Downcast for Twhere
T: Any,
impl<T> Downcast for Twhere
T: Any,
source§fn into_any(self: Box<T>) -> Box<dyn Any>
fn into_any(self: Box<T>) -> Box<dyn Any>
Convert
Box<dyn Trait>
(where Trait: Downcast
) to Box<dyn Any>
. Box<dyn Any>
can
then be further downcast
into Box<ConcreteType>
where ConcreteType
implements Trait
.source§fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>
fn into_any_rc(self: Rc<T>) -> Rc<dyn Any>
Convert
Rc<Trait>
(where Trait: Downcast
) to Rc<Any>
. Rc<Any>
can then be
further downcast
into Rc<ConcreteType>
where ConcreteType
implements Trait
.source§fn as_any(&self) -> &(dyn Any + 'static)
fn as_any(&self) -> &(dyn Any + 'static)
Convert
&Trait
(where Trait: Downcast
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. This is needed since Rust cannot
generate &Any
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fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
Convert
&mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s.