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use crate::geometry::{ContactEvent, ContactPair, IntersectionEvent};
use crossbeam::channel::Sender;
bitflags::bitflags! {
#[cfg_attr(feature = "serde-serialize", derive(Serialize, Deserialize))]
/// Flags affecting the events generated for this collider.
pub struct ActiveEvents: u32 {
/// If set, Rapier will call `EventHandler::handle_intersection_event` whenever relevant for this collider.
const INTERSECTION_EVENTS = 0b0001;
/// If set, Rapier will call `PhysicsHooks::handle_contact_event` whenever relevant for this collider.
const CONTACT_EVENTS = 0b0010;
}
}
impl Default for ActiveEvents {
fn default() -> Self {
ActiveEvents::empty()
}
}
/// Trait implemented by structures responsible for handling events generated by the physics engine.
///
/// Implementors of this trait will typically collect these events for future processing.
pub trait EventHandler: Send + Sync {
/// Handle an intersection event.
///
/// A intersection event is emitted when the state of intersection between two colliders changes.
fn handle_intersection_event(&self, event: IntersectionEvent);
/// Handle a contact event.
///
/// A contact event is emitted when two collider start or stop touching, independently from the
/// number of contact points involved.
fn handle_contact_event(&self, event: ContactEvent, contact_pair: &ContactPair);
}
impl EventHandler for () {
fn handle_intersection_event(&self, _event: IntersectionEvent) {}
fn handle_contact_event(&self, _event: ContactEvent, _contact_pair: &ContactPair) {}
}
/// A physics event handler that collects events into a crossbeam channel.
pub struct ChannelEventCollector {
intersection_event_sender: Sender<IntersectionEvent>,
contact_event_sender: Sender<ContactEvent>,
}
impl ChannelEventCollector {
/// Initialize a new physics event handler from crossbeam channel senders.
pub fn new(
intersection_event_sender: Sender<IntersectionEvent>,
contact_event_sender: Sender<ContactEvent>,
) -> Self {
Self {
intersection_event_sender,
contact_event_sender,
}
}
}
impl EventHandler for ChannelEventCollector {
fn handle_intersection_event(&self, event: IntersectionEvent) {
let _ = self.intersection_event_sender.send(event);
}
fn handle_contact_event(&self, event: ContactEvent, _: &ContactPair) {
let _ = self.contact_event_sender.send(event);
}
}
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