微信小程序开发之圆形菜单仿建行圆形菜单_小程序开发|微信|小程序|公众号设计|APP定制|三级分销商城-沈阳汇海科技

建行APP首页有个圆形菜单.仿了个玩具出来.

功能介绍:
1.一个圆形背景.六个item菜单.中间是微信用户的头像;
2.触摸滚动.速度较小时,随手指滚动,手指抬起,滚动停止;速度较大时,随手指滚动,手指抬起,还会自动滚动一段时间;
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1.微信小程序开发之大转盘仿天猫超市抽奖
2.微信小程序之仿微信漂流瓶
3.微信小程序开发之视频播放器 Video 弹幕弹幕颜色自定义
4.微信小程序开发之录音机音频播放动画 (真机可用)
5.微信小程序开发之麦克风动画帧动画放大淡出
上一张真机截图:

上代码:
1.index.js

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(),
        })
      }
    }
  }
})

2.index.wxml


  
    
    
      
        
          
        
        
          {{item.menu}}

3.index.wxss

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;
}

js注释补充:
获取手指抬起时的角速度
角速度说明
1.获取角度.借图说话.
Math.sqrt( x * x + y * y )是斜边长，乘以 sin a 就是 y 的长度；
获取a的角度：Math.asin(y / Math.hypot(x, y) ；
[ hypot是x * x + y * y ]
2.根据角度差计算角速度
var angleSpeed = this.data.tempAngle * 1000 / (upTime - this.data.downTime);
3.当角速度小于100的时候触摸滑动停止,不自动滚动;大于100时,自动滚动.我这里用动画,有个问题:很难把握动画持续时间和速度的关系.总感觉不够流畅.我表示不能忍.
4.分象限的问题.看看代码就知道了.主要是根据up时的触摸点相对于圆点的X轴差值来计算.大于0就是一四象限.小于0就是二三象限.