Drag, zoom, rotate (mouse gesture) function code

var cat =  || {}; 
 = { 
  left: 0, 
  top: 0, 
  scaleVal: 1,  //Zoom  rotateVal: 0,  //Rotation  curStatus: 0,  //Record the status of the current gesture, 0:Drag, 1:Scaling, 2:Rotation  //initialization  init: function ($targetObj, callback) { 
    ($targetObj, 'touchstart', function (ev) { 
       = 0; 
      ();//Block default events    }); 
    if (!.cat_touchjs_data) 
      callback(0, 0, 1, 0); 
    else { 
      var jsonObj = (.cat_touchjs_data); 
       = parseFloat(),  = parseFloat(),  = parseFloat(),  = parseFloat(); 
      callback(, , , ); 
    } 
  }, 
  //drag  drag: function ($targetObj, callback) { 
    ($targetObj, 'drag', function (ev) { 
      $("left",  + ).css("top",  + ); 
    }); 
    ($targetObj, 'dragend', function (ev) { 
       =  + ; 
       =  + ; 
      callback(, ); 
    }); 
  }, 
  //Zoom  scale: function ($targetObj, callback) { 
    var initialScale =  || 1; 
    var currentScale; 
    ($targetObj, 'pinch', function (ev) { 
      if ( == 2) { 
        return; 
      } 
       = 1; 
      currentScale =  - 1; 
      currentScale = initialScale + currentScale; 
       = currentScale; 
      var transformStyle = 'scale(' +  + ') rotate(' +  + 'deg)'; 
      $("transform", transformStyle).css("-webkit-transform", transformStyle); 
      callback(); 
    }); 
    ($targetObj, 'pinchend', function (ev) { 
      if ( == 2) { 
        return; 
      } 
      initialScale = currentScale; 
       = currentScale; 
      callback(); 
    }); 
  }, 
  //Rotation  rotate: function ($targetObj, callback) { 
    var angle =  || 0; 
    ($targetObj, 'rotate', function (ev) { 
      if ( == 1) { 
        return; 
      } 
       = 2; 
      var totalAngle = angle + ; 
      if ( === 'end') { 
        angle = angle + ; 
      } 
       = totalAngle; 
      var transformStyle = 'scale(' +  + ') rotate(' +  + 'deg)'; 
      $("transform", transformStyle).css("-webkit-transform", transformStyle); 
      $('data-rotate', ); 
      callback(); 
    }); 
  } 
}; 

<div style="position:relative;width: 100%;height: 250px;overflow: hidden;border: 1px dashed #ff0000;"> 
 <img  style="position:relative;transform-origin:center" src="/images/" /> 
</div>

var $targetObj = $('#targetObj'); 
//Initialize settings($targetObj, function (left, top, scale, rotate) {}; 
//Initialize the drag gesture (comment it out if you don't need it)($targetObj, function (left, top) { }); 
//Initialize the zoom gesture (comment out if you don't need it)($targetObj, function (scale) { }); 
//Initialize the rotation gesture (comment out if you don't need it)($targetObj, function (rotate) { });