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;varcurrentScale;

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);

});

}

};