nalgebra/src/structs/pnt_macros.rs

#![macro_escape]

macro_rules! orig_impl(
    ($t: ident, $comp0: ident $(,$compN: ident)*) => (
        impl<N: Zero> Orig for $t<N> {
            #[inline]
            fn orig() -> $t<N> {
                $t {
                    $comp0: Zero::zero()
                    $(, $compN: Zero::zero() )*
                }
            }

            #[inline]
            fn is_orig(&self) -> bool {
                self.$comp0.is_zero() $(&& self.$compN.is_zero() )*
            }
        }
    )
)

macro_rules! pnt_sub_impl(
    ($t: ident, $tv: ident, $trhs: ident) => (
        impl<N: Sub<N, N>> $trhs<N, $tv<N>> for $t<N> {
            #[inline]
            fn binop(left: &$t<N>, right: &$t<N>) -> $tv<N> {
                *left.as_vec() - *right.as_vec()
            }
        }
    )
)

macro_rules! pnt_add_vec_impl(
    ($t: ident, $tv: ident, $trhs: ident, $comp0: ident $(,$compN: ident)*) => (
        impl<N: Add<N, N>> $trhs<N, $t<N>> for $tv<N> {
            #[inline]
            fn binop(left: &$t<N>, right: &$tv<N>) -> $t<N> {
                $t::new(left.$comp0 + right.$comp0 $(, left.$compN + right.$compN)*)
            }
        }
    )
)

macro_rules! pnt_sub_vec_impl(
    ($t: ident, $tv: ident, $trhs: ident, $comp0: ident $(,$compN: ident)*) => (
        impl<N: Sub<N, N>> $trhs<N, $t<N>> for $tv<N> {
            #[inline]
            fn binop(left: &$t<N>, right: &$tv<N>) -> $t<N> {
                $t::new(left.$comp0 - right.$comp0 $(, left.$compN - right.$compN)*)
            }
        }
    )
)

macro_rules! pnt_as_vec_impl(
    ($t: ident, $tv: ident, $comp0: ident $(,$compN: ident)*) => (
        impl<N> $t<N> {
            #[inline]
            pub fn to_vec(self) -> $tv<N> {
                $tv::new(
                    self.$comp0
                    $(, self.$compN)*
                )
            }

            #[inline]
            pub fn as_vec<'a>(&'a self) -> &'a $tv<N> {
                unsafe {
                    mem::transmute(self)
                }
            }

            #[inline]
            fn set_coords(&mut self, v: $tv<N>) {
                self.$comp0 = v.$comp0;
                $(self.$compN = v.$compN;)*
            }
        }

        impl<N> PntAsVec<$tv<N>> for $t<N> {
            #[inline]
            fn to_vec(self) -> $tv<N> {
                self.to_vec()
            }

            #[inline]
            fn as_vec<'a>(&'a self) -> &'a $tv<N> {
                self.as_vec()
            }

            #[inline]
            fn set_coords(&mut self, v: $tv<N>) {
                self.set_coords(v)
            }
        }
    )
)

macro_rules! pnt_to_homogeneous_impl(
    ($t: ident, $t2: ident, $extra: ident, $comp0: ident $(,$compN: ident)*) => (
        impl<N: Clone + One + Zero> ToHomogeneous<$t2<N>> for $t<N> {
            fn to_homogeneous(v: &$t<N>) -> $t2<N> {
                let mut res: $t2<N> = Orig::orig();

                res.$comp0    = v.$comp0.clone();
                $( res.$compN = v.$compN.clone(); )*
                res.$extra    = One::one();

                res
            }
        }
    )
)

macro_rules! pnt_from_homogeneous_impl(
    ($t: ident, $t2: ident, $extra: ident, $comp0: ident $(,$compN: ident)*) => (
        impl<N: Clone + Div<N, N> + One + Zero> FromHomogeneous<$t2<N>> for $t<N> {
            fn from(v: &$t2<N>) -> $t<N> {
                let mut res: $t<N> = Orig::orig();

                res.$comp0    = v.$comp0.clone() / v.$extra;
                $( res.$compN = v.$compN.clone() / v.$extra; )*

                res
            }
        }
    )
)