Home > Web Front-end > JS Tutorial > body text

Hammer.js implements the image gesture amplification function on the mobile side

php中世界最好的语言
Release: 2018-05-11 14:41:51
Original
4063 people have browsed it

 var reqAnimationFrame = (function() {
       return window[Hammer.prefixed(window, 'requestAnimationFrame')] || function(callback) {
         window.setTimeout(callback, 1000 / 60);
       };
     })();
     var el = $('img');
     var ticking = false;
     var transform;
     var initScale = 1;
     var _eImg = '';
     for (var m = 0; m < el.length; m++) {
       var mc = new Hammer.Manager(el[m]);
       mc.add(new Hammer.Pan({
         threshold: 0,
         pointers: 0
       }));
       mc.add(new Hammer.Swipe()).recognizeWith(mc.get(&#39;pan&#39;));
       mc.add(new Hammer.Pinch({
         threshold: 0
       })).recognizeWith(mc.get(&#39;pan&#39;));
       mc.on(&#39;panstart panmove&#39;, onPan);
       mc.on(&#39;pinchstart pinchmove&#39;, onPinch);
       mc.on(&#39;swipe&#39;, onSwipe);
     }
 
     function resetElement() {
       el.addClass(&#39;animate&#39;);
       transform = {
         translate: {
           x: 0,
           y: 0
         },
         scale: 1,
         angle: 0,
         rx: 0,
         ry: 0,
         rz: 0
       };
       requestElementUpdate();
     }
 
     function updateElementTransform() {
       var value = [&#39;translate3d(&#39; + transform.translate.x + &#39;px, &#39; + transform.translate.y + &#39;px, 0)&#39;, &#39;scale(&#39; + transform.scale + &#39;, &#39; + transform.scale + &#39;)&#39;, &#39;rotate3d(&#39; + transform.rx + &#39;,&#39; + transform.ry + &#39;,&#39; + transform.rz + &#39;,&#39; + transform.angle + &#39;deg)&#39;];
       value = value.join(&#39; &#39;);
       if (_eImg != &#39;&#39;) {
         _eImg.style.webkitTransform = value;
         _eImg.style.mozTransform = value;
         _eImg.style.transform = value;
         //_eImg.css({ &#39;transform&#39;: value }, { &#39;-webkit-transform&#39;: value });
       }
       ticking = false;
     }
 
     function requestElementUpdate() {
       if (!ticking) {
         reqAnimationFrame(updateElementTransform);
         ticking = true;
       }
     }
 
     function onPan(ev) {
       el.removeClass(&#39;animate&#39;);
       transform.translate = {
         x: ev.deltaX,
         y: ev.deltaY
       };
     }
 
     function onPinch(ev) {
       if (ev.type == &#39;pinchstart&#39;) {
         initScale = transform.scale || 1;
       }
       el.removeClass(&#39;animate&#39;);
       transform.scale = initScale * ev.scale;
       requestElementUpdate();
       _eImg = ev.target;
       return _eImg;
     }
 
     function onSwipe(ev) {
       var angle = 10;
       transform.ry = (ev.direction & Hammer.DIRECTION_HORIZONTAL) ? 1 : 0;
       transform.rx = (ev.direction & Hammer.DIRECTION_VERTICAL) ? 1 : 0;
       transform.angle = (ev.direction & (Hammer.DIRECTION_RIGHT | Hammer.DIRECTION_UP)) ? angle : -angle;
       requestElementUpdate();
       _eImg = ev.target;
       return _eImg;
     }
     resetElement();
Copy after login

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Recommended reading:

Node.js file system operation

What are the methods of es6 deconstruction

The above is the detailed content of Hammer.js implements the image gesture amplification function on the mobile side. For more information, please follow other related articles on the PHP Chinese website!

Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template