engine/systems/WallBounds.ts


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import { System, SystemNames } from ".";
import { BoundingBox, ComponentNames } from "../components";
import { Game } from "../Game";
import type { Entity } from "../entities";
import { clamp } from "../utils";

export class WallBounds extends System {
  private screenWidth: number;

  constructor(screenWidth: number) {
    super(SystemNames.WallBounds);

    this.screenWidth = screenWidth;
  }

  public update(_dt: number, game: Game) {
    game.componentEntities
      .get(ComponentNames.WallBounded)
      ?.forEach((entityId) => {
        const entity = game.entities.get(entityId);
        if (!entity.hasComponent(ComponentNames.BoundingBox)) {
          return;
        }

        const boundingBox = entity.getComponent<BoundingBox>(
          ComponentNames.BoundingBox
        );

        boundingBox.center.x = clamp(
          boundingBox.center.x,
          boundingBox.dimension.width / 2,
          this.screenWidth - boundingBox.dimension.width / 2
        );
      });
  }
}