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小程序如何发布_微信小程序开发之圆形菜单 仿建

作者:admin 发布时间:2021-01-12
微信小程序开发之圆形菜单 仿建行圆形菜单实例       本篇文章主要介绍了微信小程序开发之圆形菜单 仿建行圆形菜单实例,具有一定的参考价值,有需要的可以了解一下。

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;

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

 view 
 view 
 image src="{{userInfo.avatarUrl}}" /image 
 view catchtouchmove="buttonMove" catchtouchstart="buttonStart" catchtouchend="buttonEnd" 
 view wx:for="{{menuList}}" wx:key="unique" animation="{{animationData}}" 
 view data-menu="{{item.menu}}" 
 image src="{{item.src}}" /image 
 /view 
 view 
 text {{item.menu}} /text 
 /view 
 /view 
 /view 
 /view 
 /view 

3.index.wxss

page {
 background-image: url('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;
.-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;

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.

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持凡科。



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