silphius/app/ecs-systems/interactions.js

import {System} from '@/ecs/index.js';
import {distance} from '@/util/math.js';

export default class Interactions extends System {

  static queries() {
    return {
      default: ['Interacts'],
    };
  }

  tick() {
    for (const entity of this.select('default')) {
      const {Interacts} = entity;
      Interacts.willInteractWith = 0
      // todo sort
      const entities = Array.from(this.ecs.system('Colliders').within(Interacts.aabb()))
        .filter((other) => other !== entity)
        .sort(({Position: l}, {Position: r}) => {
          return distance(entity.Position, l) > distance(entity.Position, r) ? -1 : 1;
        });
      for (const other of entities) {
        if (other === entity) {
          continue;
        }
        if (other.Interactive && other.Interactive.interacting) {
          Interacts.willInteractWith = other.id;
        }
      }
    }
  }

}