server/aspnetapp/wwwroot/lib/swiper/src/components/zoom/zoom.js

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

const Zoom = {
  // Calc Scale From Multi-touches
  getDistanceBetweenTouches(e) {
    if (e.targetTouches.length < 2) return 1;
    const x1 = e.targetTouches[0].pageX;
    const y1 = e.targetTouches[0].pageY;
    const x2 = e.targetTouches[1].pageX;
    const y2 = e.targetTouches[1].pageY;
    const distance = Math.sqrt(((x2 - x1) ** 2) + ((y2 - y1) ** 2));
    return distance;
  },
  // Events
  onGestureStart(e) {
    const swiper = this;
    const params = swiper.params.zoom;
    const zoom = swiper.zoom;
    const { gesture } = zoom;
    zoom.fakeGestureTouched = false;
    zoom.fakeGestureMoved = false;
    if (!Support.gestures) {
      if (e.type !== 'touchstart' || (e.type === 'touchstart' && e.targetTouches.length < 2)) {
        return;
      }
      zoom.fakeGestureTouched = true;
      gesture.scaleStart = Zoom.getDistanceBetweenTouches(e);
    }
    if (!gesture.$slideEl || !gesture.$slideEl.length) {
      gesture.$slideEl = $(e.target).closest('.swiper-slide');
      if (gesture.$slideEl.length === 0) gesture.$slideEl = swiper.slides.eq(swiper.activeIndex);
      gesture.$imageEl = gesture.$slideEl.find('img, svg, canvas');
      gesture.$imageWrapEl = gesture.$imageEl.parent(`.${params.containerClass}`);
      gesture.maxRatio = gesture.$imageWrapEl.attr('data-swiper-zoom') || params.maxRatio;
      if (gesture.$imageWrapEl.length === 0) {
        gesture.$imageEl = undefined;
        return;
      }
    }
    gesture.$imageEl.transition(0);
    swiper.zoom.isScaling = true;
  },
  onGestureChange(e) {
    const swiper = this;
    const params = swiper.params.zoom;
    const zoom = swiper.zoom;
    const { gesture } = zoom;
    if (!Support.gestures) {
      if (e.type !== 'touchmove' || (e.type === 'touchmove' && e.targetTouches.length < 2)) {
        return;
      }
      zoom.fakeGestureMoved = true;
      gesture.scaleMove = Zoom.getDistanceBetweenTouches(e);
    }
    if (!gesture.$imageEl || gesture.$imageEl.length === 0) return;
    if (Support.gestures) {
      zoom.scale = e.scale * zoom.currentScale;