A Pristine Lawn Without the Effort

<script>
(function () {
  // max positions to assign classes for (controls how many "steps" of the curve we support)
  const MAX_DISTANCE = 4;

  function attachCurvyToContainer(container) {
    const swiper = container.swiper;
    if (!swiper) return false;

    function update() {
      const slides = Array.from(swiper.slides || []);
      // collect the set of original indices (data-swiper-slide-index)
      const realIndexSet = new Set(slides.map(s => {
        const attr = s.getAttribute('data-swiper-slide-index');
        return attr === null ? null : parseInt(attr, 10);
      }).filter(n => n !== null && !isNaN(n)));
      const total = realIndexSet.size || slides.length;
      const half = Math.floor(total / 2);

      // current real index (0..total-1)
      const currentReal = (typeof swiper.realIndex !== 'undefined') ? swiper.realIndex :
                          (slides[swiper.activeIndex] ? parseInt(slides[swiper.activeIndex].getAttribute('data-swiper-slide-index') || 0, 10) : 0);

      slides.forEach(slide => {
        // remove previously added classes starting with 'curvy-pos-'
        Array.from(slide.classList).forEach(c => {
          if (c.indexOf('curvy-pos-') === 0) slide.classList.remove(c);
        });

        const di = slide.getAttribute('data-swiper-slide-index');
        if (di === null) return;
        const idx = parseInt(di, 10);

        // compute circular delta in range roughly [-half, +half]
        let rawDelta = idx - currentReal;
        let delta = ((rawDelta + total + half) % total) - half;

        // clamp to MAX_DISTANCE so we don't create huge classes
        if (delta > MAX_DISTANCE) delta = MAX_DISTANCE;
        if (delta < -MAX_DISTANCE) delta = -MAX_DISTANCE;

        const cls = (delta === 0) ? 'curvy-pos-0'
                  : (delta > 0) ? 'curvy-pos-' + delta
                  : 'curvy-pos-n' + Math.abs(delta);
        slide.classList.add(cls);
      });
    }

    // initial update + events
    update();
    swiper.on && swiper.on('init', update);
    swiper.on && swiper.on('slideChange', update);
    swiper.on && swiper.on('transitionEnd', update);
    swiper.on && swiper.on('resize', update);

    // also rerun when window finishes loading (images might change layout)
    window.addEventListener('load', update);
    return true;
  }

  // run for every container - wait for swiper instance up to ~5 seconds
  document.querySelectorAll('.bricks-swiper-container').forEach(container => {
    if (container.swiper) {
      attachCurvyToContainer(container);
      return;
    }
    let tries = 0;
    const iv = setInterval(() => {
      if (container.swiper) {
        clearInterval(iv);
        attachCurvyToContainer(container);
      }
      if (++tries > 50) clearInterval(iv); // stop trying after ~5s
    }, 100);
  });
})();
</script>