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use geometry::*;
pub enum Hitbox {
Circle(CircleHitbox),
Point(PointHitbox),
Capsule(CapsuleHitbox)
}
pub struct CircleHitbox {
pub pos: Vec2d,
pub radius: f64
}
pub struct PointHitbox {
pub pos: Vec2d
}
pub struct CapsuleHitbox {
pub line: LineSegment,
pub radius: f64
}
impl Hitbox {
pub fn intersect(a: &Hitbox, b: &Hitbox) -> bool {
use self::Hitbox::*;
match (a, b) {
(Circle(x), Circle(y)) => circles_intersect(x, y),
(Circle(x), Point(y)) => circle_point_intersect(x, y),
(Point(x), Circle(y)) => circle_point_intersect(y, x),
(Point(x), Point(y)) => points_intersect(x, y),
(Capsule(x), Capsule(y)) => capsules_intersect(x, y),
(Capsule(x), Circle(y)) => capsule_circle_intersect(x, y),
(Circle(x), Capsule(y)) => capsule_circle_intersect(y, x),
(Capsule(x), Point(y)) => capsule_point_intersect(x, y),
(Point(x), Capsule(y)) => capsule_point_intersect(y, x),
}
}
}
fn circles_intersect(x: &CircleHitbox, y: &CircleHitbox) -> bool {
x.pos.distance_squared(y.pos) <= (x.radius + y.radius).powi(2)
}
fn circle_point_intersect(x: &CircleHitbox, y: &PointHitbox) -> bool {
x.pos.distance_squared(y.pos) <= x.radius.powi(2)
}
fn points_intersect(x: &PointHitbox, y: &PointHitbox) -> bool {
x.pos == y.pos
}
fn capsules_intersect(x: &CapsuleHitbox, y: &CapsuleHitbox) -> bool {
true //TODO
}
fn capsule_circle_intersect(x: &CapsuleHitbox, y: &CircleHitbox) -> bool {
x.line.distance(y.pos) <= x.radius + y.radius
}
fn capsule_point_intersect(x: &CapsuleHitbox, y: &PointHitbox) -> bool {
x.line.distance(y.pos) <= x.radius
}
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