59 lines
1.6 KiB
Rust
59 lines
1.6 KiB
Rust
use num::One;
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use simba::scalar::RealField;
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use crate::base::allocator::Allocator;
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use crate::base::dimension::{DimNameAdd, DimNameSum, U1};
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use crate::base::{DefaultAllocator, MatrixN};
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use crate::geometry::{TCategory, Transform};
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impl<N: RealField, D: DimNameAdd<U1>, C: TCategory> Transform<N, D, C>
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where
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DefaultAllocator: Allocator<N, DimNameSum<D, U1>, DimNameSum<D, U1>>,
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{
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/// Creates a new identity transform.
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///
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/// # Example
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///
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/// ```
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/// # use nalgebra::{Transform2, Projective2, Affine2, Transform3, Projective3, Affine3, Point2, Point3};
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///
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/// let pt = Point2::new(1.0, 2.0);
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/// let t = Projective2::identity();
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/// assert_eq!(t * pt, pt);
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///
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/// let aff = Affine2::identity();
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/// assert_eq!(aff * pt, pt);
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///
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/// let aff = Transform2::identity();
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/// assert_eq!(aff * pt, pt);
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///
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/// // Also works in 3D.
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/// let pt = Point3::new(1.0, 2.0, 3.0);
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/// let t = Projective3::identity();
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/// assert_eq!(t * pt, pt);
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///
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/// let aff = Affine3::identity();
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/// assert_eq!(aff * pt, pt);
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///
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/// let aff = Transform3::identity();
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/// assert_eq!(aff * pt, pt);
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/// ```
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#[inline]
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pub fn identity() -> Self {
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Self::from_matrix_unchecked(MatrixN::<_, DimNameSum<D, U1>>::identity())
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}
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}
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impl<N: RealField, D: DimNameAdd<U1>, C: TCategory> One for Transform<N, D, C>
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where
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DefaultAllocator: Allocator<N, DimNameSum<D, U1>, DimNameSum<D, U1>>,
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{
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/// Creates a new identity transform.
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#[inline]
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fn one() -> Self {
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Self::identity()
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}
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}
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