var pageX,pageY,position_top,position_left;function setGesture(el) {var obj = {}; //定义一个对象var istouch = false;var start = [];el.addEventListener("touchstart", function(e) {if (e.touches.length >= 2) { //判断是否有两个点在屏幕上istouch = true;start = e.touches; //得到第一组两个点obj.gesturestart && obj.gesturestart.call(el); //执行gesturestart方法}else if(e.touches.length == 1){istouch = true;var touch = e.touches[0]; //获取第一个触点pageX = Number(touch.pageX); //页面触点X坐标pageY = Number(touch.pageY); //页面触点Y坐标// 获取对象的top left值var _obj = $('body .tpsf')position_left = parseFloat(_obj.css('left').split('p')[0]);position_top = parseFloat(_obj.css('top').split('p')[0]);}}, false);document.addEventListener("touchmove", function(e) {e.preventDefault();if (e.touches.length >= 2 && istouch) {var now = e.touches; //得到第二组两个点var scale = getDistance(now[0], now[1]) / getDistance(start[0], start[1]); //得到缩放比例，getDistance是勾股定理的一个方法e.scale = scale.toFixed(2);obj.gesturemove && obj.gesturemove.call(el, e); //执行gesturemove方法}else if(e.touches.length == 1){var touch = e.touches[0]; //获取第一个触点var pageX2 = Number(touch.pageX); //页面触点X坐标var pageY2 = Number(touch.pageY); //页面触点Y坐标//控制图片移动$('body .tpsf').css({'top': position_top + pageY2 - pageY + 'px',"left": position_left + pageX2 - pageX + 'px'})}}, false);document.addEventListener("touchend", function(e) {if (istouch) {istouch = false;obj.gestureend && obj.gestureend.call(el); //执行gestureend方法};}, false);return obj;};function getDistance(p1, p2) {var x = p2.pageX - p1.pageX,y = p2.pageY - p1.pageY;return Math.sqrt((x * x) + (y * y));};function getAngle(p1, p2) {var x = p1.pageX - p2.pageX,y = p1.pageY - p2.pageY;return Math.atan2(y, x) * 180 / Math.PI;};var box = document.querySelector(".tpsf");var boxGesture = setGesture(box); //得到一个对象boxGesture.gesturestart = function() { //双指开始// box.style.backgroundColor = "yellow";};boxGesture.gesturemove = function(e) { //双指移动box.innerHTML = e.scale + "<br />" + e.rotation;box.style.transform = "scale(" + e.scale + ")"; //改变目标元素的大小和角度};boxGesture.gestureend = function() { //双指结束box.innerHTML = "";};
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