目錄
1. 基本想法
2. 程式碼結構如下:
3. index目錄
4. control目錄
5. 工程全域控制
主要練習了微信小程式的發展。這裡簡單記錄一下主要程式碼片段。也是趟過了許多的坑,例如:微信小程式不支援完全全屏,微信小程式不能橫屏展示。所以開發過程中也用了一些非常手段。可以說這只是一個很基本的demo,所以裡面很多東西,像是攝影機監控ip、頁面元素定位我都使用了寫死的值。特別是介面,我只是在iPhone 6上面做的實驗,所以換到其他手機上時,介面就會變型了。
進入小程式時展示index頁,可以讓使用者輸入服務端url(模擬上一篇中在瀏覽器取得get請求)
然後跳到實際的小車控制介面,並可以透過點擊按鈕來實現小車控制
控制小車的移動,主要是在control.js中定義了介面按鈕事件的回應,在回應事件的過程中實作http請求的傳送
#index頁面如下:
進去之後的頁面如下(其中中間空白處會展示相機監控,不過我並沒有啟動,所以看不見):
其中,index下面是首頁,control是控制頁面,res目錄下存放的是圖片資源
index.js
//index.js //获取应用实例 const app = getApp() Page({ data: { logo: "/res/rasp-logo.png", welcome: "欢迎使用树莓小车", enterBtn: "进入", PromoteMsg: "Please enter the server address (eg: http://x.x.x.x:8080)", reqURL: "" }, // 从输入框中获取用户输入的服务器地址信息 getURL: function (e) { this.setData({ reqURL: e.detail.value }) }, enterClicked: function (e) { /* * 当按下进入按钮,需要做以下事情: * 1. 首先判断用户是否已经在输入框中输入完整的服务器地址 * 2. 发起一个到服务器的GET请求,并分析服务器的响应结果 * 3. 跳转到小车控制界面 */ console.log(this.data.reqURL) if (this.data.reqURL == '') { wx.showModal({ title: '提示', content: '请先输入正确的服务器地址!', }) return } // 发起到服务器的GET请求 wx.request({ url: this.data.reqURL, success: function (res) { // 在这里获取POST请求地址,以及视频流地址,然后赋值给全局变量,供control页面调用 console.log(res.data.match(/url = \"(\S*)\"/)[1]) console.log(res.data.match(/src=\"(\S*)\"/)[1]) app.globalData.postURL = res.data.match(/url = \"(\S*)\"/)[1] app.globalData.cameraURL = res.data.match(/src=\"(\S*)\"/)[1] // 跳转到control页面 wx.navigateTo({ url: '/pages/control/control', }) }, fail: function(res) { wx.showModal({ title: '提示', content: '请检查输入的服务器地址!', }) } }) } })
#index.json:無數據,只有一對打括號
index.wxml
<!--index.wxml--> <view> <view class="welcome"> <view class="logo"> <image style="width: 250rpx; height: 250rpx" src="{{logo}}"></image> </view> <view> <text class="words">{{welcome}}</text> </view> </view> <input class="requestURL" type="text" placeholder="{{PromoteMsg}}" focus='1' cursor='10' confirm-type="done" bindinput='getURL'></input> <button class='enter' bindtap='enterClicked'>{{enterBtn}}</button> </view>
index.wxss
/**index.wxss**/ .welcome{ display: flex; margin-top: 50rpx; flex-direction: column; align-items: center; justify-content: space-between; } .requestURL{ margin: 50rpx 10rpx 30rpx 10rpx; border: 1px solid gray; font-style: italic; font-size: small } .enter{ margin-right: 10rpx; width: 150rpx; height: 60rpx; font-size: small }
control.js
// pages/control/control.js const app = getApp() Page({ /** * 页面的初始数据 */ data: { // Car control images "forwardBtn": "/res/forward.png", "leftBtn": "/res/left.png", "rightBtn": "/res/right.png", "backLeftBtn": "/res/back-left.png", "backRightBtn": "/res/back-right.png", "backBtn": "/res/backward.png", // Camera control images "upBtn": "/res/forward.png", "camLeftBtn": "/res/camLeft.png", "camRightBtn": "/res/camRight.png", "downBtn": "/res/backward.png", "resetBtn": "/res/reset.png" }, carMove: function(event) { wx.request({ url: this.data.postURL, data: event.currentTarget.dataset.direction, method: "POST", success: function(res){ }, fail: function(res){ } }) }, carStop: function(event) { wx.request({ url: this.data.postURL, data: "S", method: "POST", success: function (res) { }, fail: function (res) { } }) }, camMove: function(event) { wx.request({ url: this.data.postURL, data: event.currentTarget.dataset.direction, method: "POST", success: function (res) { }, fail: function (res) { } }) }, /** * 生命周期函数--监听页面加载 */ onLoad: function (options) { //this.data.cameraURL = app.globalData.cameraURL this.setData({ cameraURL: app.globalData.cameraURL, postURL: app.globalData.postURL }) console.log(this.data.cameraURL) console.log("post url in control page: " + app.globalData.postURL) }, /** * 生命周期函数--监听页面初次渲染完成 */ onReady: function () { }, /** * 生命周期函数--监听页面显示 */ onShow: function () { //console.log(wx.getSystemInfoSync().windowWidth) //console.log(wx.getSystemInfoSync().windowHeight) }, /** * 生命周期函数--监听页面隐藏 */ onHide: function () { }, /** * 生命周期函数--监听页面卸载 */ onUnload: function () { }, /** * 页面相关事件处理函数--监听用户下拉动作 */ onPullDownRefresh: function () { }, /** * 页面上拉触底事件的处理函数 */ onReachBottom: function () { }, /** * 用户点击右上角分享 */ onShareAppMessage: function () { } })
#control.json
{ "navigationBarBackgroundColor": "#ffffff", "navigationBarTextStyle": "black", "navigationBarTitleText": "树莓小车", "backgroundColor": "#eeeeee", "backgroundTextStyle": "light", "enablePullDownRefresh": false, "navigationStyle": "custom", "disableScroll": true }
<!--pages/control/control.wxml--> <view class='control'> <!-- This image shows the camera view --> <image class='cameraView' src='http://192.168.1.104:8080/?action=stream' style="z-index:1"></image> <!-- The following six images control the car move --> <image class='button' id='forward' src='{{forwardBtn}}' style="position:absolute;z-index:2" bindtouchstart='carMove' data-direction='F' bindtouchend='carStop'></image> <image class='button' id='left' src='{{leftBtn}}' style="position:absolute;z-index:2" bindtouchstart='carMove' data-direction='L' bindtouchend='carStop'></image> <image class='button' id='right' src='{{rightBtn}}' style="position:absolute;z-index:2" bindtouchstart='carMove' data-direction='R' bindtouchend='carStop'></image> <image class='button' id='backLeft' src='{{backLeftBtn}}' style="position:absolute;z-index:2" bindtouchstart='carMove' data-direction='BL' bindtouchend='carStop'></image> <image class='button' id='backRight' src='{{backRightBtn}}' style="position:absolute;z-index:2" bindtouchstart='carMove' data-direction='BR' bindtouchend='carStop'></image> <image class='button' id='back' src='{{backBtn}}' style="position:absolute;z-index:2" bindtouchstart='carMove' data-direction='B' bindtouchend='carStop'></image> <!-- The following images control the camera move --> <image class='button' id='up' src='{{upBtn}}' style="position:absolute;z-index:2" bindtouchstart='camMove' data-direction='VU'></image> <image class='button' id='camLeft' src='{{camLeftBtn}}' style="position:absolute;z-index:2" bindtouchstart='camMove' data-direction='HL'></image> <image class='button' id='camRight' src='{{camRightBtn}}' style="position:absolute;z-index:2" bindtouchstart='camMove' data-direction='HR'></image> <image class='button' id='down' src='{{downBtn}}' style="position:absolute;z-index:2" bindtouchstart='camMove' data-direction='VD'></image> <image class='button' id='reset' src='{{resetBtn}}' style="position:absolute;z-index:2" bindtouchstart='camMove' data-direction='RESET'></image> </view>
/* pages/control/control.wxss */ .control { width: 100%; height: 100%; transform: rotate(90deg); background-color: #eee; justify-content: center; } .cameraView { margin-left: 0px; width: 603px; height: 375px; background-color: #eee; justify-content: center; } .button { height: 60px; width: 60px; opacity: 0.3; } #forward { left: 60px; top: 135px; } #left { left: 0px; top: 195px; } #right { left: 120px; top: 195px; } #backLeft { left: 0px; top: 255px; } #backRight { left: 120px; top: 255px; } #back { left: 60px; top: 315px; } #up { left: 480px; top: 195px; } #camLeft { left: 420px; top: 255px; } #camRight { left: 540px; top: 255px; } #down { left: 480px; top: 315px; } #reset{ left: 480px; top: 135px }
5. 工程全域控制
//app.js App({ onLaunch: function () { // 展示本地存储能力 var logs = wx.getStorageSync('logs') || [] logs.unshift(Date.now()) wx.setStorageSync('logs', logs) // 登录 wx.login({ success: res => { // 发送 res.code 到后台换取 openId, sessionKey, unionId } }) // 获取用户信息 wx.getSetting({ success: res => { if (res.authSetting['scope.userInfo']) { // 已经授权,可以直接调用 getUserInfo 获取头像昵称,不会弹框 wx.getUserInfo({ success: res => { // 可以将 res 发送给后台解码出 unionId this.globalData.userInfo = res.userInfo // 由于 getUserInfo 是网络请求,可能会在 Page.onLoad 之后才返回 // 所以此处加入 callback 以防止这种情况 if (this.userInfoReadyCallback) { this.userInfoReadyCallback(res) } } }) } } }) }, globalData: { userInfo: null, postURL: null, cameraURL: null } })
{ "pages": [ "pages/index/index", "pages/control/control" ], "window": { "backgroundTextStyle": "light", "navigationBarBackgroundColor": "#fff", "navigationBarTitleText": "树莓小车", "navigationBarTextStyle": "black", "showStatusBar": false } }
/**app.wxss**/ .container { height: 100%; display: flex; flex-direction: column; align-items: center; justify-content: space-between; padding: 200rpx 0; box-sizing: border-box; }
{ "description": "项目配置文件。", "packOptions": { "ignore": [] }, "setting": { "urlCheck": false, "es6": true, "postcss": true, "minified": true, "newFeature": true }, "compileType": "miniprogram", "libVersion": "2.0.4", "appid": "wx18414b9f85bfc895", "projectname": "wechat-control", "isGameTourist": false, "condition": { "search": { "current": -1, "list": [] }, "conversation": { "current": -1, "list": [] }, "game": { "currentL": -1, "list": [] }, "miniprogram": { "current": -1, "list": [] } } }
以上是微信小程式--樹莓派(raspberry pi)小車控制的程式碼流程的詳細內容。更多資訊請關注PHP中文網其他相關文章!