silphius/app/ecs-systems/sprite-direction.js

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

export default class SpriteDirection extends System {

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

  tick() {
    for (const [Sprite, entityId] of this.select('default')) {
      const entity = this.ecs.get(entityId);
      const parts = [];
      if (entity.Controlled) {
        const {moveUp, moveRight, moveDown, moveLeft} = entity.Controlled;
        if (moveUp > 0 || moveRight > 0 || moveDown > 0 || moveLeft > 0) {
          parts.push('moving');
        }
        else {
          parts.push('idle');
        }
      }
      if (entity.Direction) {
        const name = {
          0: 'up',
          1: 'right',
          2: 'down',
          3: 'left',
        };
        parts.push(name[entity.Direction.direction]);
      }
      if (parts.length > 0) {
        Sprite.animation = parts.join(':');
      }
    }
  }

}