var app = getApp()
Page({
 data: {
 userInfo: {},
 menuList: {},//菜单集合
 animationData: {},
 startPoint: {},//触摸开始
 dotPoint: {},//圆点坐标
 startAngle: 0,//开始角度
 tempAngle: 0,//移动角度
 downTime: 0,//按下时间
 upTime: 0,//抬起时间
 // isRunning: false,//正在滚动
 },
 onLoad: function () {
 var that = this
 //调用应用实例的方法获取全局数据
 app.getUserInfo(function (userInfo) {
  //更新数据
  that.setData({
  userInfo: userInfo,
  })
 })
 wx.getSystemInfo({
  success: function (res) {
  var windowWidth = res.windowWidth * 0.5;
  that.setData({
   //圆点坐标,x为屏幕一半,y为半径与margin-top之和,px
   //后面获取的触摸坐标是px,所以这里直接用px.
   dotPoint: { clientX: windowWidth, clientY: 250 }
  })
  }
 })
 },
 onReady: function (e) {
 var that = this;
 app.menuConfig = {
  menu: [
  { 'index': 0, 'menu': '我的账户', 'src': '../images/account.png' },
  { 'index': 1, 'menu': '信用卡', 'src': '../images/card.png' },
  { 'index': 2, 'menu': '投资理财', 'src': '../images/investment.png' },
  { 'index': 3, 'menu': '现金贷款', 'src': '../images/loan.png' },
  { 'index': 4, 'menu': '特色服务', 'src': '../images/service.png' },
  { 'index': 5, 'menu': '转账汇款', 'src': '../images/transfer.png' }
  ]
 }
 // 绘制转盘
 var menuConfig = app.menuConfig.menu,
  len = menuConfig.length,
  menuList = [],
  degNum = 360 / len // 文字旋转 turn 值
 for (var i = 0; i < len; i++) {
  menuList.push({ deg: i * degNum, menu: menuConfig[i].menu, src: menuConfig[i].src });
  console.log("menu:" + menuConfig[i].menu)
 }
 that.setData({
  menuList: menuList
 });
 },
 // 菜单拖动的三个方法
 buttonStart: function (e) {
 this.setData({
  startPoint: e.touches[0]
 })
 var x = this.data.startPoint.clientX - this.data.dotPoint.clientX;
 var y = this.data.startPoint.clientY - this.data.dotPoint.clientY;
 var startAngle = Math.asin(y / Math.hypot(x, y)) * 180 / Math.PI;
 this.setData({
  startAngle: startAngle
 })

 },
 buttonMove: function (e) {
 //获取滑动时的时间
 var downTime = Date.now();
 this.setData({
  downTime: downTime
 })
 var that = this;
 var endPoint = e.touches[e.touches.length - 1]
 //根据触摸位置计算角度
 var x = endPoint.clientX - this.data.dotPoint.clientX;
 var y = endPoint.clientY - this.data.dotPoint.clientY;
 var moveAngle = Math.asin(y / Math.hypot(x, y)) * 180 / Math.PI
 var quadrant = 1;
 if (x >= 0) {
  quadrant = y >= 0 ? 4 : 1;
 } else {
  quadrant = y >= 0 ? 3 : 2;
 }
 var tempAngle = 0;
 // 如果是一、四象限，则直接end角度-start角度，角度值都是正值 
 if (quadrant == 1 || quadrant == 4) {
  tempAngle += moveAngle - this.data.startAngle;
 } else
 // 二、三象限，色角度值是负值 
 {
  tempAngle += this.data.startAngle - moveAngle;
 }
 var menuConfig = app.menuConfig.menu;
 var menuList = [];
 for (var i = 0; i < this.data.menuList.length; i++) {
  menuList.push({ deg: this.data.menuList[i].deg + tempAngle, menu: menuConfig[i].menu, src: menuConfig[i].src });
 }
 this.setData({
  menuList: menuList
 })
 //重置开始角度
 this.setData({
  startPoint: e.touches[e.touches.length - 1]
 })
 var endX = this.data.startPoint.clientX - this.data.dotPoint.clientX;
 var endY = this.data.startPoint.clientY - this.data.dotPoint.clientY;
 var startAngle = Math.asin(endY / Math.hypot(endX, endY)) * 180 / Math.PI;
 this.setData({
  startAngle: startAngle,
  tempAngle: tempAngle
 })
 },
 buttonEnd: function (e) {
 // 计算，每秒移动的角度 
 var that = this;
 var upTime = Date.now();
 var angleSpeed = this.data.tempAngle * 1000 / (upTime - this.data.downTime);
 if (Math.abs(angleSpeed) < 100) {
  //速度小于100时,停止滚动
  return
 } else {
  //速度大于100时,自动滚动
  if (angleSpeed > 0) {
  if (angleSpeed > 500) angleSpeed = 500
  var animationRun = wx.createAnimation({
   duration: 2000,
   //ease-out结束时减速
   timingFunction: 'ease-out'
  })
  that.animationRun = animationRun
  animationRun.rotate(angleSpeed).step()
  that.setData({
   animationData: animationRun.export(),
  })
  }
  else {
  if (angleSpeed < -500) angleSpeed = -500
  angleSpeed = Math.abs(angleSpeed);
  var animationRun = wx.createAnimation({
   duration: 2000,
   // ease-out结束时减速
   timingFunction: 'ease-out'
  })
  that.animationRun = animationRun
  animationRun.rotate(-angleSpeed).step()
  that.setData({
   animationData: animationRun.export(),
  })
  }
 }
 }
})

<view class="circle-out">
 <view class="circle-in">
 <image class="userinfo-avatar" src="{{userInfo.avatarUrl}}"></image>
 <view class="menu-list" catchtouchmove="buttonMove" catchtouchstart="buttonStart" catchtouchend="buttonEnd">
  <view class="menu-item" wx:for="{{menuList}}" wx:key="unique" animation="{{animationData}}">
  <view class="menu-circle-item" style="-webkit-transform: rotate({{item.deg}}deg);" data-menu="{{item.menu}}">
   <image class="image-style" src="{{item.src}}"></image>
  </view>
  <view class="menu-circle-text-item" style="-webkit-transform: rotate({{item.deg}}deg);">
   <text class="text-style">{{item.menu}}</text>
  </view>
  </view>
 </view>
 </view>
</view>

page {
 background-image: url('http://ac-ejx0nsfy.clouddn.com/ac767407f474e1c3970a.jpg');
 background-attachment: fixed;
 background-repeat: no-repeat;
 background-size: cover;
}

.circle-out {
 margin: 75px auto;
 position: relative;
 width: 350px;
 height: 350px;
 border-radius: 50%;
 background-color: #415cab;
}

.userinfo-avatar {
 width: 70px;
 height: 70px;
 border-radius: 50%;
 position: absolute;
 top: 0;
 bottom: 0;
 left: 0;
 right: 0;
 margin: auto;
}

/**子控件的透明度等于父控件透明度*子控件透明度,父控件的opacity设置后,
所以子控件opacity设置为1依然无效,必须分离开
*/

.circle-in {
 position: absolute;
 width: 330px;
 height: 330px;
 border-radius: 50%;
 top: 0;
 bottom: 0;
 left: 0;
 right: 0;
 margin: auto;
 background-color: #fff;
}

/**菜单*/

.menu-list {
 position: absolute;
 left: 0;
 top: 0;
 width: inherit;
 height: inherit;
}

.menu-item {
 position: absolute;
 left: 0;
 top: 0;
 width: 100%;
 height: 100%;
 font-weight: 500;
}

.menu-circle-item {
 -webkit-transform-origin: 50% 150px;
 transform-origin: 50% 150px;
 margin: 0 auto;
 margin-top: 15px;
 position: relative;
 height: 50px;
 width: 50px;
 background-color: #77c2fc;
 text-align: center;
 border-radius: 50%;
}

.image-style {
 height: 25px;
 width: 25px;
 color: #f00;
 margin: 12.5px auto;
}

.text-style {
 margin: 5px auto;
 font-size: 15px;
}

/***/

.menu-circle-text-item {
 -webkit-transform-origin: 50% 100px;
 transform-origin: 50% 100px;
 margin: 0 auto;
 position: relative;
 height: 25px;
 width: auto;
 text-align: center;
}

var angleSpeed = this.data.tempAngle * 1000 / (upTime - this.data.downTime);