65 lines
1.7 KiB
Rust
65 lines
1.7 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::{Const, DefaultAllocator, OMatrix};
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use crate::geometry::{TCategory, Transform};
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impl<T: RealField, C: TCategory, const D: usize> Transform<T, C, D>
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where
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Const<D>: DimNameAdd<U1>,
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DefaultAllocator: Allocator<T, DimNameSum<Const<D>, U1>, DimNameSum<Const<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(OMatrix::<
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_,
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DimNameSum<Const<D>, U1>,
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DimNameSum<Const<D>, U1>,
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>::identity())
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}
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}
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impl<T: RealField, C: TCategory, const D: usize> One for Transform<T, C, D>
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where
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Const<D>: DimNameAdd<U1>,
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DefaultAllocator: Allocator<T, DimNameSum<Const<D>, U1>, DimNameSum<Const<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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