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line.rs: destructure self with let, save indentation

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This commit is contained in:
Jonathan Neuschäfer 2015-03-14 03:44:18 +01:00
parent c80f0889be
commit 556c5f2375
4 changed files with 83 additions and 92 deletions
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61
src/aabb.rs
View file

@ -201,43 +201,40 @@ impl<S: BaseNum> fmt::Debug for Aabb3<S> {
impl<S: BaseFloat> Intersect<Option<Point2<S>>> for (Ray2<S>, Aabb2<S>) {
fn intersection(&self) -> Option<Point2<S>> {
match *self {
(ref ray, ref aabb) => {
let (ref ray, ref aabb) = *self;
let mut tmin: S = Float::neg_infinity();
let mut tmax: S = Float::infinity();
let mut tmin: S = Float::neg_infinity();
let mut tmax: S = Float::infinity();
if ray.direction.x != zero() {
let tx1 = (aabb.min.x - ray.origin.x) / ray.direction.x;
let tx2 = (aabb.max.x - ray.origin.x) / ray.direction.x;
tmin = tmin.max(tx1.min(tx2));
tmax = tmax.min(tx1.max(tx2));
}
if ray.direction.x != zero() {
let tx1 = (aabb.min.x - ray.origin.x) / ray.direction.x;
let tx2 = (aabb.max.x - ray.origin.x) / ray.direction.x;
tmin = tmin.max(tx1.min(tx2));
tmax = tmax.min(tx1.max(tx2));
}
if ray.direction.y != zero() {
let ty1 = (aabb.min.y - ray.origin.y) / ray.direction.y;
let ty2 = (aabb.max.y - ray.origin.y) / ray.direction.y;
tmin = tmin.max(ty1.min(ty2));
tmax = tmax.min(ty1.max(ty2));
}
if ray.direction.y != zero() {
let ty1 = (aabb.min.y - ray.origin.y) / ray.direction.y;
let ty2 = (aabb.max.y - ray.origin.y) / ray.direction.y;
tmin = tmin.max(ty1.min(ty2));
tmax = tmax.min(ty1.max(ty2));
}
if tmin < zero() && tmax < zero() {
None
}
else if tmax >= tmin {
if tmin >= zero() {
Some(Point2::new(ray.origin.x + ray.direction.x * tmin,
ray.origin.y + ray.direction.y * tmin))
}
else {
Some(Point2::new(ray.origin.x + ray.direction.x * tmax,
ray.origin.y + ray.direction.y * tmax))
}
}
else {
None
}
if tmin < zero() && tmax < zero() {
None
}
else if tmax >= tmin {
if tmin >= zero() {
Some(Point2::new(ray.origin.x + ray.direction.x * tmin,
ray.origin.y + ray.direction.y * tmin))
}
else {
Some(Point2::new(ray.origin.x + ray.direction.x * tmax,
ray.origin.y + ray.direction.y * tmax))
}
}
else {
None
}
}
}

82
src/line.rs
View file

@ -41,53 +41,51 @@ pub type Line3<S> = Line<Point3<S>>;
/// Determines if an intersection between a ray and a line segments is found.
impl<S: BaseFloat> Intersect<Option<Point2<S>>> for (Ray2<S>, Line2<S>) {
fn intersection(&self) -> Option<Point2<S>> {
match *self {
(ref ray, ref line) => {
let p = ray.origin;
let q = line.origin;
let r = ray.direction;
let s = Vector2::new(line.dest.x - line.origin.x, line.dest.y - line.origin.y);
let zero: S = Zero::zero();
let (ref ray, ref line) = *self;
let cross_1 = r.perp_dot(&s);
let qmp = Vector2::new(q.x - p.x, q.y - p.y);
let cross_2 = qmp.perp_dot(&r);
let p = ray.origin;
let q = line.origin;
let r = ray.direction;
let s = Vector2::new(line.dest.x - line.origin.x, line.dest.y - line.origin.y);
let zero: S = Zero::zero();
if cross_1 == zero {
if cross_2 != zero {
// parallel
return None;
}
// collinear
let q2mp = Vector2::new(line.dest.x - p.x, line.dest.y - p.y);
let dot_1 = qmp.dot(&r);
let dot_2 = q2mp.dot(&r);
if (dot_1 <= zero && dot_2 >= zero) || (dot_1 >= zero && dot_2 <= zero) {
return Some(p);
}
else if dot_1 >= zero && dot_2 >= zero {
if dot_1 <= dot_2 {
return Some(q);
}
else {
return Some(line.dest);
}
}
// no overlap exists
return None;
}
let t = qmp.perp_dot(&s) / cross_1;
let u = cross_2 / cross_1;
if zero <= t && u >= zero && u <= One::one() {
return Some(Point2::new(p.x + t*r.x, p.y + t*r.y));
}
let cross_1 = r.perp_dot(&s);
let qmp = Vector2::new(q.x - p.x, q.y - p.y);
let cross_2 = qmp.perp_dot(&r);
if cross_1 == zero {
if cross_2 != zero {
// parallel
return None;
}
// collinear
let q2mp = Vector2::new(line.dest.x - p.x, line.dest.y - p.y);
let dot_1 = qmp.dot(&r);
let dot_2 = q2mp.dot(&r);
if (dot_1 <= zero && dot_2 >= zero) || (dot_1 >= zero && dot_2 <= zero) {
return Some(p);
}
else if dot_1 >= zero && dot_2 >= zero {
if dot_1 <= dot_2 {
return Some(q);
}
else {
return Some(line.dest);
}
}
// no overlap exists
return None;
}
let t = qmp.perp_dot(&s) / cross_1;
let u = cross_2 / cross_1;
if zero <= t && u >= zero && u <= One::one() {
return Some(Point2::new(p.x + t*r.x, p.y + t*r.y));
}
return None;
}
}

12
src/plane.rs
View file

@ -111,13 +111,11 @@ impl<S: BaseFloat> Plane<S> {
impl<S: BaseFloat> Intersect<Option<Point3<S>>> for (Plane<S>, Ray3<S>) {
fn intersection(&self) -> Option<Point3<S>> {
match *self {
(ref p, ref r) => {
let t = -(p.d + r.origin.dot(&p.n)) / r.direction.dot(&p.n);
if t < Zero::zero() { None }
else { Some(r.origin.add_v(&r.direction.mul_s(t))) }
}
}
let (ref p, ref r) = *self;
let t = -(p.d + r.origin.dot(&p.n)) / r.direction.dot(&p.n);
if t < Zero::zero() { None }
else { Some(r.origin.add_v(&r.direction.mul_s(t))) }
}
}

20
src/sphere.rs
View file

@ -31,17 +31,15 @@ pub struct Sphere<S> {
impl<S: BaseFloat> Intersect<Option<Point3<S>>> for (Sphere<S>, Ray3<S>) {
fn intersection(&self) -> Option<Point3<S>> {
match *self {
(ref s, ref r) => {
let l = s.center.sub_p(&r.origin);
let tca = l.dot(&r.direction);
if tca < zero() { return None; }
let d2 = l.dot(&l) - tca*tca;
if d2 > s.radius*s.radius { return None; }
let thc = (s.radius*s.radius - d2).sqrt();
Some(r.origin.add_v(&r.direction.mul_s(tca - thc)))
}
}
let (ref s, ref r) = *self;
let l = s.center.sub_p(&r.origin);
let tca = l.dot(&r.direction);
if tca < zero() { return None; }
let d2 = l.dot(&l) - tca*tca;
if d2 > s.radius*s.radius { return None; }
let thc = (s.radius*s.radius - d2).sqrt();
Some(r.origin.add_v(&r.direction.mul_s(tca - thc)))
}
}