touch.js 拖动、缩放、旋转 （鼠标手势）功能代码

可以实现手势操作：拖动、缩放、旋转。封装好的脚本方法是这样的：

var cat = window.cat || {}; 
cat.touchjs = { 
  left: 0, 
  top: 0, 
  scaleval: 1,  //缩放 
  rotateval: 0,  //旋转 
  curstatus: 0,  //记录当前手势的状态, 0:拖动, 1:缩放, 2:旋转 
  //初始化 
  init: function ($targetobj, callback) { 
    touch.on($targetobj, 'touchstart', function (ev) { 
      cat.touchjs.curstatus = 0; 
      ev.preventdefault();//阻止默认事件 
    }); 
    if (!window.localstorage.cat_touchjs_data) 
      callback(0, 0, 1, 0); 
    else { 
      var jsonobj = json.parse(window.localstorage.cat_touchjs_data); 
      cat.touchjs.left = parsefloat(jsonobj.left), cat.touchjs.top = parsefloat(jsonobj.top), cat.touchjs.scaleval = parsefloat(jsonobj.scale), cat.touchjs.rotateval = parsefloat(jsonobj.rotate); 
      callback(cat.touchjs.left, cat.touchjs.top, cat.touchjs.scaleval, cat.touchjs.rotateval); 
    } 
  }, 
  //拖动 
  drag: function ($targetobj, callback) { 
    touch.on($targetobj, 'drag', function (ev) { 
      $targetobj.css("left", cat.touchjs.left + ev.x).css("top", cat.touchjs.top + ev.y); 
    }); 
    touch.on($targetobj, 'dragend', function (ev) { 
      cat.touchjs.left = cat.touchjs.left + ev.x; 
      cat.touchjs.top = cat.touchjs.top + ev.y; 
      callback(cat.touchjs.left, cat.touchjs.top); 
    }); 
  }, 
  //缩放 
  scale: function ($targetobj, callback) { 
    var initialscale = cat.touchjs.scaleval || 1; 
    var currentscale; 
    touch.on($targetobj, 'pinch', function (ev) { 
      if (cat.touchjs.curstatus == 2) { 
        return; 
      } 
      cat.touchjs.curstatus = 1; 
      currentscale = ev.scale - 1; 
      currentscale = initialscale + currentscale; 
      cat.touchjs.scaleval = currentscale; 
      var transformstyle = 'scale(' + cat.touchjs.scaleval + ') rotate(' + cat.touchjs.rotateval + 'deg)'; 
      $targetobj.css("transform", transformstyle).css("-webkit-transform", transformstyle); 
      callback(cat.touchjs.scaleval); 
    }); 
    touch.on($targetobj, 'pinchend', function (ev) { 
      if (cat.touchjs.curstatus == 2) { 
        return; 
      } 
      initialscale = currentscale; 
      cat.touchjs.scaleval = currentscale; 
      callback(cat.touchjs.scaleval); 
    }); 
  }, 
  //旋转 
  rotate: function ($targetobj, callback) { 
    var angle = cat.touchjs.rotateval || 0; 
    touch.on($targetobj, 'rotate', function (ev) { 
      if (cat.touchjs.curstatus == 1) { 
        return; 
      } 
      cat.touchjs.curstatus = 2; 
      var totalangle = angle + ev.rotation; 
      if (ev.fingerstatus === 'end') { 
        angle = angle + ev.rotation; 
      } 
      cat.touchjs.rotateval = totalangle; 
      var transformstyle = 'scale(' + cat.touchjs.scaleval + ') rotate(' + cat.touchjs.rotateval + 'deg)'; 
      $targetobj.css("transform", transformstyle).css("-webkit-transform", transformstyle); 
      $targetobj.attr('data-rotate', cat.touchjs.rotateval); 
      callback(cat.touchjs.rotateval); 
    }); 
  } 
}; 

html代码：

<div style="position:relative;width: 100%;height: 250px;overflow: hidden;border: 1px dashed #ff0000;"> 
 <img id="targetobj" style="position:relative;transform-origin:center" src="http://demo.somethingwhat.com/images/flower1.jpg" /> 
</div>

 js调用：

var $targetobj = $('#targetobj'); 
//初始化设置 
cat.touchjs.init($targetobj, function (left, top, scale, rotate) {}; 
//初始化拖动手势（不需要就注释掉） 
cat.touchjs.drag($targetobj, function (left, top) { }); 
//初始化缩放手势（不需要就注释掉） 
cat.touchjs.scale($targetobj, function (scale) { }); 
//初始化旋转手势（不需要就注释掉） 
cat.touchjs.rotate($targetobj, function (rotate) { }); 

以上所述是小编给大家介绍的touch.js 拖动、缩放、旋转 （鼠标手势）功能代码，希望对大家有所帮助