docs: function onEntityDraw(entity, context) {
        context.save();
        if (selectionService.isSelected(entity)) {
          context.strokeStyle = '#f33';
        } else {
          context.strokeStyle = '#666';
        }
        context.strokeRect(
          entity.pos.x, entity.pos.y, entity.size.x, entity.size.y);
        context.restore();
      }