forked from M-Labs/nalgebra
144 lines
3.7 KiB
Rust
144 lines
3.7 KiB
Rust
#[cfg(feature = "arbitrary")]
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use quickcheck::{Arbitrary, Gen};
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use num::{Bounded, One, Zero};
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use rand::distributions::{Distribution, Standard};
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use rand::Rng;
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use alga::general::ClosedDiv;
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use base::allocator::Allocator;
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use base::dimension::{DimName, DimNameAdd, DimNameSum, U1, U2, U3, U4, U5, U6};
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use base::{DefaultAllocator, Scalar, VectorN};
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use geometry::Point;
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impl<N: Scalar, D: DimName> Point<N, D>
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where DefaultAllocator: Allocator<N, D>
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{
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/// Creates a new point with uninitialized coordinates.
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#[inline]
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pub unsafe fn new_uninitialized() -> Self {
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Self::from(VectorN::new_uninitialized())
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}
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/// Creates a new point with all coordinates equal to zero.
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#[inline]
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pub fn origin() -> Self
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where N: Zero {
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Self::from(VectorN::from_element(N::zero()))
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}
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/// Creates a new point from a slice.
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#[inline]
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pub fn from_slice(components: &[N]) -> Self {
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Self::from(VectorN::from_row_slice(components))
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}
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/// Creates a new point from its homogeneous vector representation.
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///
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/// In practice, this builds a D-dimensional points with the same first D component as `v`
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/// divided by the last component of `v`. Returns `None` if this divisor is zero.
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#[inline]
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pub fn from_homogeneous(v: VectorN<N, DimNameSum<D, U1>>) -> Option<Self>
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where
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N: Scalar + Zero + One + ClosedDiv,
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D: DimNameAdd<U1>,
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DefaultAllocator: Allocator<N, DimNameSum<D, U1>>,
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{
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if !v[D::dim()].is_zero() {
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let coords = v.fixed_slice::<D, U1>(0, 0) / v[D::dim()];
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Some(Self::from(coords))
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} else {
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None
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}
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}
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}
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/*
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*
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* Traits that build points.
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*
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*/
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impl<N: Scalar + Bounded, D: DimName> Bounded for Point<N, D>
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where DefaultAllocator: Allocator<N, D>
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{
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#[inline]
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fn max_value() -> Self {
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Self::from(VectorN::max_value())
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}
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#[inline]
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fn min_value() -> Self {
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Self::from(VectorN::min_value())
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}
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}
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impl<N: Scalar, D: DimName> Distribution<Point<N, D>> for Standard
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where
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DefaultAllocator: Allocator<N, D>,
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Standard: Distribution<N>,
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{
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#[inline]
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fn sample<'a, G: Rng + ?Sized>(&self, rng: &mut G) -> Point<N, D> {
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Point::from(rng.gen::<VectorN<N, D>>())
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}
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}
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#[cfg(feature = "arbitrary")]
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impl<N: Scalar + Arbitrary + Send, D: DimName> Arbitrary for Point<N, D>
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where
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DefaultAllocator: Allocator<N, D>,
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<DefaultAllocator as Allocator<N, D>>::Buffer: Send,
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{
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#[inline]
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fn arbitrary<G: Gen>(g: &mut G) -> Self {
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Point::from(VectorN::arbitrary(g))
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}
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}
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/*
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*
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* Small points construction from components.
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*
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*/
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macro_rules! componentwise_constructors_impl(
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($($D: ty, $($args: ident:$irow: expr),*);* $(;)*) => {$(
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impl<N: Scalar> Point<N, $D>
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where DefaultAllocator: Allocator<N, $D> {
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/// Initializes this matrix from its components.
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#[inline]
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pub fn new($($args: N),*) -> Point<N, $D> {
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unsafe {
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let mut res = Self::new_uninitialized();
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$( *res.get_unchecked_mut($irow) = $args; )*
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res
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}
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}
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}
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)*}
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);
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componentwise_constructors_impl!(
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U1, x:0;
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U2, x:0, y:1;
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U3, x:0, y:1, z:2;
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U4, x:0, y:1, z:2, w:3;
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U5, x:0, y:1, z:2, w:3, a:4;
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U6, x:0, y:1, z:2, w:3, a:4, b:5;
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);
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macro_rules! from_array_impl(
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($($D: ty, $len: expr);*) => {$(
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impl <N: Scalar> From<[N; $len]> for Point<N, $D> {
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fn from (coords: [N; $len]) -> Self {
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Point {
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coords: coords.into()
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}
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}
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}
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)*}
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);
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from_array_impl!(U1, 1; U2, 2; U3, 3; U4, 4; U5, 5; U6, 6);
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