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use crate::math::{Point, Real, Vector};
use crate::shape::SupportMap;
use na;
use num::Zero;
#[cfg(feature = "std")]
use either::Either;
#[cfg(not(feature = "std"))]
use na::RealField;
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[cfg_attr(feature = "cuda", derive(cust_core::DeviceCopy))]
#[derive(PartialEq, Debug, Copy, Clone)]
#[repr(C)]
pub struct Cone {
pub half_height: Real,
pub radius: Real,
}
impl Cone {
pub fn new(half_height: Real, radius: Real) -> Cone {
Cone {
half_height,
radius,
}
}
#[cfg(feature = "std")]
#[inline]
pub fn scaled(
self,
scale: &Vector<Real>,
nsubdivs: u32,
) -> Option<Either<Self, super::ConvexPolyhedron>> {
if scale.x != scale.z || scale.y < 0.0 {
let (mut vtx, idx) = self.to_trimesh(nsubdivs);
vtx.iter_mut()
.for_each(|pt| pt.coords = pt.coords.component_mul(&scale));
Some(Either::Right(super::ConvexPolyhedron::from_convex_mesh(
vtx, &idx,
)?))
} else {
Some(Either::Left(Self::new(
self.half_height * scale.y,
self.radius * scale.x,
)))
}
}
}
impl SupportMap for Cone {
#[inline]
fn local_support_point(&self, dir: &Vector<Real>) -> Point<Real> {
let mut vres = *dir;
vres[1] = 0.0;
if vres.normalize_mut().is_zero() {
vres = na::zero();
vres[1] = self.half_height.copysign(dir[1]);
} else {
vres = vres * self.radius;
vres[1] = -self.half_height;
if dir.dot(&vres) < dir[1] * self.half_height {
vres = na::zero();
vres[1] = self.half_height
}
}
Point::from(vres)
}
}