微信小程序ibeacon三点定位详解
空余时间简单写了一个微信小程序ibeacon三点定位。
事先淘宝买了七八个ibeacon小设备，放置在办公司角落。分别设置三个ibeacon的位置坐标点，根据每一个ibeacon到已经开启蓝牙的目标物距离，计算出目标物在当前区域内坐标位置。适用于区域内购物指示。当然，进入该区域事先要打开手机蓝牙。
下面代码：
var app = getApp()
Page({
data: {
motto: 'Hello World',
openBLE:'打开蓝牙设备',
startBLEDiscovery:'初始化蓝牙设备',
startBLEDevices:'目标定位',
reStartSearchBLE:'重置蓝牙',
startSearchBLE:'默认空',
userInfo: {},
deviceId: '',
searchFlag:true,
deviceRSSI:'',
deviceName:'',
deviceId:[],
advertisServiceUUIDs: [],
advertisData:[],
canvasPointX:'',
canvasPointY:'',
avatarUrl:'../index/bg-image.jpg',
showPosition:''
},
//事件处理函数
bindViewTap: function() {
wx.navigateTo({
url: '../logs/logs'
})
},
onLoad: function () {
var that = this
//调用应用实例的方法获取全局数据
//that.setData({ deviceId: opt.deviceId })
app.getUserInfo(function(userInfo){
//更新数据
that.setData({
userInfo:userInfo
})
//判断兼容性
if (wx.openBluetoothAdapter) {
//打开蓝牙适配器，如果没有打开 showtoast
wx.openBluetoothAdapter({
success: function(res){
// success
//获取本机的蓝牙适配器状态
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 本机是否已经打开蓝牙设备
wx.showToast({title:'请打开本机蓝牙设备，重新扫码', duration:10000 })
},
complete: function(res) {
// complete
}
})
} else {
// 如果希望用户在最新版本的客户端上体验您的小程序，可以这样子提示
wx.showModal({
title: '提示',
content: '当前微信版本过低，无法使用该功能，请升级到最新微信版本后重试。'
})
}
})
},
startBLEDevices: function(){
var that = this
wx.startBluetoothDevicesDiscovery({
services: [],
success: function(res){
//获取本机蓝牙设备状态
// 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 ;
调用计算rssi对应距离的函数
var iRssi = Math.abs(arrayRSSI[i]);
var power = (iRssi-59)/(10*2.0);
var mm = Math.pow(10, power);
console.log(arraydeviceName[i]+"距离的位置是"+mm+"米");
取01，02，03分别为，（2，0），（2，2），（0，2）固定坐标点，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);
}
}
}
// 从 arrayRSSI 取三个距离定位点最近的ibeacon参与定位
if(arrayRSSI.length > 3){
//根据arrayRSSI进行信号强弱排序.距离越远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;
}
}
}
//获取最近的三个距离
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);
}
}
}
//获取定位点的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('目标所在位置X是'+pointDX);
console.log('目标所在位置Y是'+pointDY);
if(pointDX > 0 && pointDY > 0){
wx.showToast({title:'欢迎进入25楼craft', duration:4000 });
}
that.setData({
canvasPointX:pointDX,
canvasPointY:pointDY
})
//创建画布
//计算坐标点在规定canvas上的位置显示
var context = wx.createCanvasContext();
context.setStrokeStyle("#00ff00");
//a,b,c,d,e,f a,b起始坐标，c半径，d，e起始和终止角度
context.arc(that.data.canvasPointX*30,that.data.canvasPointY*30,5,0,2*Math.PI);
context.fill();
wx.drawCanvas({
canvasId: 'firstCanvas',
actions: context.getActions() // 获取绘图动作数组
})
wx.showModal({title:'X轴:'+pointDX+'Y轴:'+pointDY, duration:5000 });
//开始网络请求
wx.request({
url: 'http://craftww.cn/weixinIbeacon/index.php',
data: {},
method: 'GET', // OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE, CONNECT
// header: {}, // 设置请求的 header
success: function(res){
// success
},
fail: function(res) {
// fail
},
complete: function(res) {
// complete
}
})
}else{
wx.showToast({title:'正在搜索...', duration:1000 })
开始网络请求
wx.request({
url: 'http://craftww.cn/weixinIbeacon/index.php',
data: {},
method: 'GET', // OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE, CONNECT
// header: {}, // 设置请求的 header
success: function(res){
// success
},
fail: function(res) {
// fail
},
complete: function(res) {
// complete
}
})
}
},
fail: function(res) {
// fail
},
complete: function(res) {
// complete
}
})
} ,
//动态显示
createList: function(thisName){
var that = this
that.setData({
array:[{deviceDistance:"1"},{deviceDistance:"1"},{deviceDistance:"1"},{deviceDistance:"1"},{deviceDistance:"1"}]
})
},
reStartSearchBLE: function(){
var that = this
//清除本地数据缓存
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);
//断开蓝牙
var that = this
wx.closeBluetoothAdapter({
success: function(res){
// success
console.log('重置成功');
//打开蓝牙适配器，如果没有打开 showtoast
wx.openBluetoothAdapter({
success: function(res){
// success
//获取本机的蓝牙适配器状态
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
})
