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
{{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
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.
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