transform_construction.rs - source
Description: Source of the Rust file `/Users/erlendbasso/.cargo/registry/src/github.com-1ecc6299db9ec823/nalgebra-0.32.1/src/geometry/transform_construction.rs`.
Keywords: rust, rustlang, rust-lang

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    use num::One;

    use simba::scalar::RealField;

    use crate::base::allocator::Allocator;
    use crate::base::dimension::{DimNameAdd, DimNameSum, U1};
    use crate::base::{Const, DefaultAllocator, OMatrix};

    use crate::geometry::{TCategory, Transform};

    impl<T: RealField, C: TCategory, const D: usize> Default for Transform<T, C, D>
    where
        Const<D>: DimNameAdd<U1>,
        DefaultAllocator: Allocator<T, DimNameSum<Const<D>, U1>, DimNameSum<Const<D>, U1>>,
    {
        fn default() -> Self {
            Self::identity()
        }
    }

    impl<T: RealField, C: TCategory, const D: usize> Transform<T, C, D>
    where
        Const<D>: DimNameAdd<U1>,
        DefaultAllocator: Allocator<T, DimNameSum<Const<D>, U1>, DimNameSum<Const<D>, U1>>,
    {
        /// Creates a new identity transform.
        ///
        /// # Example
        ///
        /// ```
        /// # use nalgebra::{Transform2, Projective2, Affine2, Transform3, Projective3, Affine3, Point2, Point3};
        ///
        /// let pt = Point2::new(1.0, 2.0);
        /// let t = Projective2::identity();
        /// assert_eq!(t * pt, pt);
        ///
        /// let aff = Affine2::identity();
        /// assert_eq!(aff * pt, pt);
        ///
        /// let aff = Transform2::identity();
        /// assert_eq!(aff * pt, pt);
        ///
        /// // Also works in 3D.
        /// let pt = Point3::new(1.0, 2.0, 3.0);
        /// let t = Projective3::identity();
        /// assert_eq!(t * pt, pt);
        ///
        /// let aff = Affine3::identity();
        /// assert_eq!(aff * pt, pt);
        ///
        /// let aff = Transform3::identity();
        /// assert_eq!(aff * pt, pt);
        /// ```
        #[inline]
        pub fn identity() -> Self {
            Self::from_matrix_unchecked(OMatrix::<
                _,
                DimNameSum<Const<D>, U1>,
                DimNameSum<Const<D>, U1>,
            >::identity())
        }
    }

    impl<T: RealField, C: TCategory, const D: usize> One for Transform<T, C, D>
    where
        Const<D>: DimNameAdd<U1>,
        DefaultAllocator: Allocator<T, DimNameSum<Const<D>, U1>, DimNameSum<Const<D>, U1>>,
    {
        /// Creates a new identity transform.
        #[inline]
        fn one() -> Self {
            Self::identity()
        }
    }