silphius/app/ecs-systems/colliders.js
2024-07-02 16:16:39 -05:00

91 lines
2.0 KiB
JavaScript

import {System} from '@/ecs/index.js';
import SpatialHash from '@/util/spatial-hash.js';
export default class Colliders extends System {
hash;
deindex(entities) {
super.deindex(entities);
for (const id of entities) {
this.hash.remove(id);
}
}
static get priority() {
return {
after: 'IntegratePhysics',
};
}
reindex(entities) {
for (const id of entities) {
if (1 === id) {
this.hash = new SpatialHash(this.ecs.get(1).AreaSize);
}
}
super.reindex(entities);
for (const id of entities) {
this.updateHash(this.ecs.get(id));
}
}
updateHash(entity) {
if (!entity.Collider) {
return;
}
entity.Collider.recalculateAabbs();
this.hash.update(entity.Collider.aabb, entity.id);
}
tick() {
const seen = {};
for (const entity of this.ecs.changed(['Position'])) {
if (seen[entity.id]) {
continue;
}
seen[entity.id] = true;
if (!entity.Collider) {
continue;
}
this.updateHash(entity);
for (const other of this.within(entity.Collider.aabb)) {
if (seen[other.id]) {
continue;
}
seen[other.id] = true;
if (!other.Collider) {
continue;
}
if (entity.Collider.isCollidingWith(other.Collider)) {
console.log('collide', entity, other);
}
}
}
}
within(query) {
const {x0, x1, y0, y1} = query;
const [cx0, cy0] = this.hash.chunkIndex(x0, y0);
const [cx1, cy1] = this.hash.chunkIndex(x1, y1);
const seen = {};
const within = new Set();
for (let cy = cy0; cy <= cy1; ++cy) {
for (let cx = cx0; cx <= cx1; ++cx) {
for (const id of this.hash.chunks[cx][cy]) {
if (seen[id]) {
continue;
}
seen[id] = true;
const entity = this.ecs.get(id);
if (entity.Collider.isWithin(query)) {
within.add(entity);
}
}
}
}
return within;
}
}