server/aspnetapp/wwwroot/lib/swiper/src/components/effect-coverflow/effect-coverflow.js

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import $ from '../../utils/dom';
import Support from '../../utils/support';
import Utils from '../../utils/utils';

const Coverflow = {
  setTranslate() {
    const swiper = this;
    const {
      width: swiperWidth, height: swiperHeight, slides, $wrapperEl, slidesSizesGrid,
    } = swiper;
    const params = swiper.params.coverflowEffect;
    const isHorizontal = swiper.isHorizontal();
    const transform = swiper.translate;
    const center = isHorizontal ? -transform + (swiperWidth / 2) : -transform + (swiperHeight / 2);
    const rotate = isHorizontal ? params.rotate : -params.rotate;
    const translate = params.depth;
    // Each slide offset from center
    for (let i = 0, length = slides.length; i < length; i += 1) {
      const $slideEl = slides.eq(i);
      const slideSize = slidesSizesGrid[i];
      const slideOffset = $slideEl[0].swiperSlideOffset;
      const offsetMultiplier = ((center - slideOffset - (slideSize / 2)) / slideSize) * params.modifier;

      let rotateY = isHorizontal ? rotate * offsetMultiplier : 0;
      let rotateX = isHorizontal ? 0 : rotate * offsetMultiplier;
      // var rotateZ = 0
      let translateZ = -translate * Math.abs(offsetMultiplier);

      let translateY = isHorizontal ? 0 : params.stretch * (offsetMultiplier);
      let translateX = isHorizontal ? params.stretch * (offsetMultiplier) : 0;

      // Fix for ultra small values
      if (Math.abs(translateX) < 0.001) translateX = 0;
      if (Math.abs(translateY) < 0.001) translateY = 0;
      if (Math.abs(translateZ) < 0.001) translateZ = 0;
      if (Math.abs(rotateY) < 0.001) rotateY = 0;
      if (Math.abs(rotateX) < 0.001) rotateX = 0;

      const slideTransform = `translate3d(${translateX}px,${translateY}px,${translateZ}px)  rotateX(${rotateX}deg) rotateY(${rotateY}deg)`;

      $slideEl.transform(slideTransform);
      $slideEl[0].style.zIndex = -Math.abs(Math.round(offsetMultiplier)) + 1;
      if (params.slideShadows) {
        // Set shadows
        let $shadowBeforeEl = isHorizontal ? $slideEl.find('.swiper-slide-shadow-left') : $slideEl.find('.swiper-slide-shadow-top');
        let $shadowAfterEl = isHorizontal ? $slideEl.find('.swiper-slide-shadow-right') : $slideEl.find('.swiper-slide-shadow-bottom');
        if ($shadowBeforeEl.length === 0) {
          $shadowBeforeEl = $(`<div class="swiper-slide-shadow-${isHorizontal ? 'left' : 'top'}"></div>`);
          $slideEl.append($shadowBeforeEl);
        }
        if ($shadowAfterEl.length === 0) {
          $shadowAfterEl = $(`<div class="swiper-slide-shadow-${isHorizontal ? 'right' : 'bottom'}"></div>`);
          $slideEl.append($shadowAfterEl);
        }
        if ($shadowBeforeEl.length) $shadowBeforeEl[0].style.opacity = offsetMultiplier > 0 ? offsetMultiplier : 0;
        if ($shadowAfterEl.length) $shadowAfterEl[0].style.opacity = (-offsetMultiplier) > 0 ? -offsetMultiplier : 0;
      }
    }

    // Set correct perspective for IE10
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