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
})

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