空餘時間簡單寫了一個微信小程序 ibeacon三點定位。
事先淘寶買了七八個ibeacon小設備，放置在辦公司角落。分別設置三個ibeacon的位置座標點，根據每一個ibeacon到已經開啓藍牙的目標物距離，計算出目標物在當前區域內座標位置。適用於區域內購物指示。當然，進入該區域事先要打開手機藍牙。
下面代碼：
var app = getApp()
Page({
data: {
motto: 'Hello World',
openBLE:'打開藍牙設備',
startBLEDiscovery:'初始化藍牙設備',
startBLEDevices:'目標定位',
reStartSearchBLE:'重置藍牙',
startSearchBLE:'默認空',
userInfo: {},
deviceId: '',
searchFlag:true,
deviceRSSI:'',
deviceName:'',
deviceId:[],
advertisServiceUUIDs: [],
advertisData:[],
canvasPointX:'',
canvasPointY:'',
avatarUrl:'../index/bg-image.jpg',
showPosition:''
},
//事件處理函數
bindViewTap: function() {
wx.navigateTo({
url: '../logs/logs'
})
},
onLoad: function () {
var that = this
//調用應用實例的方法獲取全局數據
//that.setData({ deviceId: opt.deviceId })
app.getUserInfo(function(userInfo){
//更新數據
that.setData({
userInfo:userInfo
})
//判斷兼容性
if (wx.openBluetoothAdapter) {
//打開藍牙適配器，如果沒有打開 showtoast
wx.openBluetoothAdapter({
success: function(res){
// success
//獲取本機的藍牙適配器狀態
wx.getBluetoothAdapterState({
success: function(res){
// success
that.setData({
searchFlag:true
})
},
fail: function(res) {
// fail
that.setData({
searchFlag:false
})
},
complete: function(res) {
// complete
}
})
},
fail: function(res) {
// fail 本機是否已經打開藍牙設備
wx.showToast({title:'請打開本機藍牙設備，重新掃碼', duration:10000 })
},
complete: function(res) {
// complete
}
})
} else {
// 如果希望用戶在最新版本的客戶端上體驗您的小程序，可以這樣子提示
wx.showModal({
title: '提示',
content: '當前微信版本過低，無法使用該功能，請升級到最新微信版本後重試。'
})
}
})
},
startBLEDevices: function(){
var that = this
wx.startBluetoothDevicesDiscovery({
services: [],
success: function(res){
//獲取本機藍牙設備狀態
// success
that.setData({
showPosition:setInterval(that.devicesFunc,1000)
})
},
fail: function(res) {
// fail
},
complete: function(res) {
// complete
}
})
},
// startBLEDevices: function(){
// var that = this
// that.setData({
// showPosition:setInterval(that.devicesFunc,1000)
// })
// },
devicesFunc: function(){
var that = this
wx.getBluetoothDevices({
success: function(res){
// console.log(res);
var arrayRSSI = new Array();
var arraydeviceName = new Array();
var arraydeviceId = new Array();
// var arrayUUIDs = new Array();
var arrayadvertisData = new Array();
var pointADistance = '';
var pointBDistance = '';
var pointCDistance = '';
for(var i = 0; i<res.devices.length;i++){
//console.log(res.devices[i].name);
if(res.devices[i].name.indexOf('craft')==0){
//console.log(res.devices[i]);
arrayRSSI.push(res.devices[i].RSSI);
arraydeviceName.push(res.devices[i].name);
arraydeviceId[i]= res.devices[i].deviceId;
arrayUUIDs[i]= res.devices[i].advertisServiceUUIDs[i];
arrayadvertisData[i]= res.devices[i].advertisData ;
調用計算rssi對應距離的函數
var iRssi = Math.abs(arrayRSSI[i]);
var power = (iRssi-59)/(10*2.0);
var mm = Math.pow(10, power);
console.log(arraydeviceName[i]+"距離的位置是"+mm+"米");
取01，02，03分別爲，（2，0），（2，2），（0，2）固定座標點，做定位
if(res.devices[i].name.indexOf('craft01')==0){
var pointARSSi = res.devices[i].RSSI ;
var iRssi = Math.abs(pointARSSi);
var power = (iRssi-55)/(10*2.0);
var pointADistance = Math.pow(10, power);
console.log("a"+pointADistance);
console.log(pointARSSi);
}
if(res.devices[i].name.indexOf('craft02')==0){
var pointBRSSi = res.devices[i].RSSI;
var iRssi = Math.abs(pointBRSSi);
var power = (iRssi-55)/(10*2.0);
var pointBDistance = Math.pow(10, power);
console.log("b"+pointBDistance);
console.log(pointBRSSi);
}
if(res.devices[i].name.indexOf('craft03')==0){
var pointCRSSi = res.devices[i].RSSI;
var iRssi = Math.abs(pointCRSSi);
var power = (iRssi-57)/(10*2.0);
var pointCDistance = Math.pow(10, power);
console.log("c"+pointCDistance);
console.log(pointCRSSi);
}
}
}
// 從 arrayRSSI 取三個距離定位點最近的ibeacon參與定位
if(arrayRSSI.length > 3){
//根據arrayRSSI進行信號強弱排序.距離越遠rssi值越小
for(var i = 0 ; i < arrayRSSI.length ; i ++){
for(var j = i+1 ; j< arrayRSSI.length ; j++){
if(arrayRSSI[i]<arrayRSSI[j]){
var select = arrayRSSI[i];
arrayRSSI[i] = arrayRSSI[j];
arrayRSSI[j] = select;
}
}
}
//獲取最近的三個距離
for(var i = 0 ; i < 3; i++){
if(i==0){
var pointARSSi = res.devices[i].RSSI ;
var iRssi = Math.abs(pointARSSi);
var power = (iRssi-55)/(10*2.0);
var pointADistance = Math.pow(10, power);
console.log("a"+pointADistance);
console.log(pointARSSi);
}
if(i==1){
var pointBRSSi = res.devices[i].RSSI;
var iRssi = Math.abs(pointBRSSi);
var power = (iRssi-55)/(10*2.0);
var pointBDistance = Math.pow(10, power);
console.log("b"+pointBDistance);
console.log(pointBRSSi);
}
if(i==2){
var pointCRSSi = res.devices[i].RSSI;
var iRssi = Math.abs(pointCRSSi);
var power = (iRssi-57)/(10*2.0);
var pointCDistance = Math.pow(10, power);
console.log("c"+pointCDistance);
console.log(pointCRSSi);
}
}
}
//獲取定位點的x和y
if(!pointADistance==''&&!pointBDistance==''&&!pointCDistance==''){
var pointDX='';var pointDY = '';
var p = Math.pow(pointADistance,2)/10-Math.pow(pointBDistance,2)/10;
pointDX = 2.5 - p;
var m = Math.pow(pointADistance,2)/10-Math.pow(pointCDistance,2)/10;
pointDY = 2.5 - m;
console.log('目標所在位置X是'+pointDX);
console.log('目標所在位置Y是'+pointDY);
if(pointDX > 0 && pointDY > 0){
wx.showToast({title:'歡迎進入25樓craft', duration:4000 });
}
that.setData({
canvasPointX:pointDX,
canvasPointY:pointDY
})
//創建畫布
//計算座標點在規定canvas上的位置顯示
var context = wx.createCanvasContext();
context.setStrokeStyle("#00ff00");
//a,b,c,d,e,f a,b起始座標，c半徑，d，e起始和終止角度
context.arc(that.data.canvasPointX*30,that.data.canvasPointY*30,5,0,2*Math.PI);
context.fill();
wx.drawCanvas({
canvasId: 'firstCanvas',
actions: context.getActions() // 獲取繪圖動作數組
})
wx.showModal({title:'X軸:'+pointDX+'Y軸:'+pointDY, duration:5000 });
//開始網絡請求
wx.request({
url: 'http://craftww.cn/weixinIbeacon/index.php',
data: {},
method: 'GET', // OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE, CONNECT
// header: {}, // 設置請求的 header
success: function(res){
// success
},
fail: function(res) {
// fail
},
complete: function(res) {
// complete
}
})
}else{
wx.showToast({title:'正在搜索...', duration:1000 })
開始網絡請求
wx.request({
url: 'http://craftww.cn/weixinIbeacon/index.php',
data: {},
method: 'GET', // OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE, CONNECT
// header: {}, // 設置請求的 header
success: function(res){
// success
},
fail: function(res) {
// fail
},
complete: function(res) {
// complete
}
})
}
},
fail: function(res) {
// fail
},
complete: function(res) {
// complete
}
})
} ,
//動態顯示
createList: function(thisName){
var that = this
that.setData({
array:[{deviceDistance:"1"},{deviceDistance:"1"},{deviceDistance:"1"},{deviceDistance:"1"},{deviceDistance:"1"}]
})
},
reStartSearchBLE: function(){
var that = this
//清除本地數據緩存
wx.stopBluetoothDevicesDiscovery({
success: function(res){
// success
},
fail: function(res) {
// fail
},
complete: function(res) {
// complete
}
})
wx.clearStorageSync();
clearInterval(that.data.showPosition);
console.log(that.data.showPosition);
// that.context.clearRect(0,0,canvas.width,canvas.height);
//斷開藍牙
var that = this
wx.closeBluetoothAdapter({
success: function(res){
// success
console.log('重置成功');
//打開藍牙適配器，如果沒有打開 showtoast
wx.openBluetoothAdapter({
success: function(res){
// success
//獲取本機的藍牙適配器狀態
wx.getBluetoothAdapterState({
success: function(res){
// success
},
fail: function(res) {
// fail
},
complete: function(res) {
// complete
}
})
},
fail: function(res) {
},
complete: function(res) {
// complete
}
})
},
fail: function(res) {
// fail
},
complete: function(res) {
// complete
}
})
}
//zheli
})