nalgebra/src/geometry/point_conversion.rs

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use num::{One, Zero};
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use alga::general::{ClosedDiv, SubsetOf, SupersetOf};
use base::{DefaultAllocator, Matrix, Scalar, VectorN};
use base::dimension::{DimName, DimNameAdd, DimNameSum, U1};
use base::allocator::Allocator;
use geometry::Point;
/*
* This file provides the following conversions:
* =============================================
*
* Point -> Point
* Point -> Vector (homogeneous)
*/
impl<N1, N2, D> SubsetOf<Point<N2, D>> for Point<N1, D>
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where
D: DimName,
N1: Scalar,
N2: Scalar + SupersetOf<N1>,
DefaultAllocator: Allocator<N2, D> + Allocator<N1, D>,
{
#[inline]
fn to_superset(&self) -> Point<N2, D> {
Point::from_coordinates(self.coords.to_superset())
}
#[inline]
fn is_in_subset(m: &Point<N2, D>) -> bool {
// FIXME: is there a way to reuse the `.is_in_subset` from the matrix implementation of
// SubsetOf?
m.iter().all(|e| e.is_in_subset())
}
#[inline]
unsafe fn from_superset_unchecked(m: &Point<N2, D>) -> Self {
Point::from_coordinates(Matrix::from_superset_unchecked(&m.coords))
}
}
impl<N1, N2, D> SubsetOf<VectorN<N2, DimNameSum<D, U1>>> for Point<N1, D>
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where
D: DimNameAdd<U1>,
N1: Scalar,
N2: Scalar + Zero + One + ClosedDiv + SupersetOf<N1>,
DefaultAllocator: Allocator<N1, D>
+ Allocator<N1, DimNameSum<D, U1>>
+ Allocator<N2, DimNameSum<D, U1>>
+ Allocator<N2, D>,
{
#[inline]
fn to_superset(&self) -> VectorN<N2, DimNameSum<D, U1>> {
let p: Point<N2, D> = self.to_superset();
p.to_homogeneous()
}
#[inline]
fn is_in_subset(v: &VectorN<N2, DimNameSum<D, U1>>) -> bool {
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::is_convertible::<_, VectorN<N1, DimNameSum<D, U1>>>(v) && !v[D::dim()].is_zero()
}
#[inline]
unsafe fn from_superset_unchecked(v: &VectorN<N2, DimNameSum<D, U1>>) -> Self {
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let coords = v.fixed_slice::<D, U1>(0, 0) / v[D::dim()];
Self::from_coordinates(::convert_unchecked(coords))
}
}