hammer.js实现图片手势放大效果

//图片手势放大 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('pan')); mc.add(new Hammer.Pinch({ threshold: 0 })).recognizeWith(mc.get('pan')); mc.on('panstart panmove', onPan); mc.on('pinchstart pinchmove', onPinch); mc.on('swipe', onSwipe); } function resetElement() { el.addClass('animate'); transform = { translate: { x: 0, y: 0 }, scale: 1, angle: 0, rx: 0, ry: 0, rz: 0 }; requestElementUpdate(); } function updateElementTransform() { var value = ['translate3d(' + transform.translate.x + 'px, ' + transform.translate.y + 'px, 0)', 'scale(' + transform.scale + ', ' + transform.scale + ')', 'rotate3d(' + transform.rx + ',' + transform.ry + ',' + transform.rz + ',' + transform.angle + 'deg)']; value = value.join(' '); if (_eImg != '') { _eImg.style.webkitTransform = value; _eImg.style.mozTransform = value; _eImg.style.transform = value; //_eImg.css({ 'transform': value }, { '-webkit-transform': value }); } ticking = false; } function requestElementUpdate() { if (!ticking) { reqAnimationFrame(updateElementTransform); ticking = true; } } function onPan(ev) { el.removeClass('animate'); transform.translate = { x: ev.deltaX, y: ev.deltaY }; } function onPinch(ev) { if (ev.type == 'pinchstart') { initScale = transform.scale || 1; } el.removeClass('animate'); 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();