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use na;
use na::{Translate, Rotate, Transform};
use math::{Point, Vector};
/// Geometric description of a polyline.
#[derive(Clone)]
pub struct Polyline<P: Point> {
/// Coordinates of the polyline vertices.
coords: Vec<P>,
/// Coordinates of the polyline normals.
normals: Option<Vec<P::Vect>>,
}
impl<P: Point> Polyline<P> {
/// Creates a new polyline.
pub fn new(coords: Vec<P>, normals: Option<Vec<P::Vect>>) -> Polyline<P> {
if let Some(ref ns) = normals {
assert!(coords.len() == ns.len(), "There must be exactly one normal per vertex.");
}
Polyline {
coords: coords,
normals: normals,
}
}
}
impl<P: Point> Polyline<P> {
/// Moves the polyline data out of it.
pub fn unwrap(self) -> (Vec<P>, Option<Vec<P::Vect>>) {
(self.coords, self.normals)
}
/// The coordinates of this polyline vertices.
#[inline]
pub fn coords(&self) -> &[P] {
&self.coords[..]
}
/// The mutable coordinates of this polyline vertices.
#[inline]
pub fn coords_mut(&mut self) -> &mut [P] {
&mut self.coords[..]
}
/// The normals of this polyline vertices.
#[inline]
pub fn normals(&self) -> Option<&[P::Vect]> {
match self.normals {
Some(ref ns) => Some(&ns[..]),
None => None
}
}
/// The mutable normals of this polyline vertices.
#[inline]
pub fn normals_mut(&mut self) -> Option<&mut [P::Vect]> {
match self.normals {
Some(ref mut ns) => Some(&mut ns[..]),
None => None
}
}
/// Translates each vertex of this polyline.
pub fn translate_by<T: Translate<P>>(&mut self, t: &T) {
for c in self.coords.iter_mut() {
*c = t.translate(c);
}
}
/// Rotates each vertex and normal of this polyline.
// XXX: we should use Rotate<P> instead of the .set_coord.
// Wa cannot make it a Rotate because the `Rotate` bound cannot appear twice… we have, again,
// to wait for the trait reform.
pub fn rotate_by<R: Rotate<P::Vect>>(&mut self, r: &R) {
for c in self.coords.iter_mut() {
let rc = r.rotate(c.as_vector());
c.set_coords(rc);
}
for n in self.normals.iter_mut() {
for n in n.iter_mut() {
*n = r.rotate(n);
}
}
}
/// Transforms each vertex and rotates each normal of this polyline.
pub fn transform_by<T: Transform<P> + Rotate<P::Vect>>(&mut self, t: &T) {
for c in self.coords.iter_mut() {
*c = t.transform(c);
}
for n in self.normals.iter_mut() {
for n in n.iter_mut() {
*n = t.rotate(n);
}
}
}
/// Scales each vertex of this polyline.
pub fn scale_by_scalar(&mut self, s: &<P::Vect as Vector>::Scalar) {
for c in self.coords.iter_mut() {
*c = *c * *s
}
// FIXME: do something for the normals?
}
}
impl<P> Polyline<P>
where P: Point {
/// Scales each vertex of this mesh.
#[inline]
pub fn scale_by(&mut self, s: &P::Vect) {
for c in self.coords.iter_mut() {
for i in 0 .. na::dimension::<P::Vect>() {
c[i] = (*c)[i] * s[i];
}
}
// FIXME: do something for the normals?
}
}