利用h5,chart.js监测手机三轴加速度,用以研究计步算法等

时间:2024-03-08 16:07:30

 

用window.DeviceMotionEvent来判断手机浏览器是否支持访问硬件资源,window.addEventListener(\'devicemotion\',deviceMotionHandler,false);通过上一句代码来对该事件进行监听,第一个参数是事件类型,第二个参数是一个function对事件的处理,在function总通过varacceleration = eventData.accelerationIncludingGravity; 获得加速器对象,x =acceleration.x;y = acceleration.y;z =acceleration.z; 分别获取传感器三个分量的参数,这样就完成了参数的获取。​

接下来,我们开始将数据弄到图表上:

首先,我们定义几个变量:

var oriValuesX = []; //存放x轴数据

var oriValuesY = []; //存放y轴数据

var oriValuesZ = []; //存放z轴数据

var oriValuesSqrt = []; //存放xyz平方相加再开根的数据

var timeX = []; //存放图表x轴的时间,单位:毫秒

var x = y = z = 0; //用以获取xyz轴当前的数据

var startTime = new Date().getTime(); //最初的开始时间,单位:毫秒

var string = \'\'; //定义一个字符串用来显示数据

随后,开始调用加速度传感器:

if (window.DeviceMotionEvent) {

   window.addEventListener(\'devicemotion\', functiondeviceMotionHandler(eventData){

       var currTime = new Date().getTime(); //当前时间

       var diffTime = currTime - startTime;//当前时间减最初时间,得到当前时间差

       timeX.push(diffTime); //将当前时间差存放

       var acceleration =eventData.accelerationIncludingGravity; //获得加速器对象

       x = acceleration.x; //获取x轴当前加速度

       y =acceleration.y; //获取y轴当前加速度

       z =acceleration.z; //获取z轴当前加速度

       oriValuesX.push(x); //将x轴当前加速度存放

      oriValuesY.push(y); //将y轴当前加速度存放

      oriValuesZ.push(z); //将z轴当前加速度存放

       oriValuesSqrt.push(Math.sqrt(x * x + y * y + z *z)); //将当前xyz加速度平方相加再开根存放

       if(timeX.length == 200){ //控制个数

           line();//调用line函数,生成图表用的

           for(var i= 0 ; i < oriValuesSqrt.length ; i++){

              string = string +(timeX[i]+":"+oriValuesSqrt[i]+"
"); //\'当前时间:数据\' 的形式显示在前台,方便查看数据

           }

          $(\'.data\').html(string);

       }

    }, false);

}

再然后就是调用chart.js​,不会用的可以参考上一篇博文://blog.sina.com.cn/s/blog_ad7cad400102xn38.html

混合4个折线,不同颜色:

var line = function(){

       var ctx =document.getElementById_x_x_x_x_x_x("myChart");

       var myChart = new Chart(ctx, {

           type:\'line\',

           data:{

              labels: timeX,

              datasets: [

                 {

                     label:"x",

                     fill:false,

                    lineTension: 0.1,

                    backgroundColor: "rgba(75,192,192,0.4)",

                    borderColor: "rgba(75,192,192,1)",

                    borderCapStyle: \'butt\',

                    borderDash: [],

                    borderDashOffset: 0.0,

                    borderJoinStyle: \'miter\',

                    pointBorderColor: "rgba(75,192,192,1)",

                    pointBackgroundColor: "#fff",

                    pointBorderWidth: 1,

                    pointHoverRadius: 5,

                    pointHoverBackgroundColor: "rgba(75,192,192,1)",

                    pointHoverBorderColor: "rgba(220,220,220,1)",

                    pointHoverBorderWidth: 2,

                    pointRadius: 1,

                    pointHitRadius: 10,

                     data:oriValuesX,

                     spanGaps:false,

                 },

                 {

                     label:"y",

                     fill:false,

                    lineTension: 0.1,

                    backgroundColor: "rgba(255, 99, 132, 0.2)",

                    borderColor: "rgba(255, 99, 132, 1)",

                    borderCapStyle: \'butt\',

                    borderDash: [],

                    borderDashOffset: 0.0,

                    borderJoinStyle: \'miter\',

                    pointBorderColor: "rgba(255, 99, 132, 1)",

                    pointBackgroundColor: "#fff",

                    pointBorderWidth: 1,

                    pointHoverRadius: 5,

                    pointHoverBackgroundColor: "rgba(255, 99, 132, 1)",

                    pointHoverBorderColor: "rgba(220,220,220,1)",

                    pointHoverBorderWidth: 2,

                    pointRadius: 1,

                    pointHitRadius: 10,

                     data:oriValuesY,

                     spanGaps:false,

                 },

                 {

                     label:"z",

                     fill:false,

                    lineTension: 0.1,

                    backgroundColor: "rgba(153, 102, 255, 0.2)",

                    borderColor: "rgba(153, 102, 255, 1)",

                    borderCapStyle: \'butt\',

                    borderDash: [],

                    borderDashOffset: 0.0,

                    borderJoinStyle: \'miter\',

                    pointBorderColor: "rgba(153, 102, 255, 1)",

                    pointBackgroundColor: "#fff",

                    pointBorderWidth: 1,

                    pointHoverRadius: 5,

                    pointHoverBackgroundColor: "rgba(153, 102, 255, 1)",

                    pointHoverBorderColor: "rgba(220,220,220,1)",

                    pointHoverBorderWidth: 2,

                    pointRadius: 1,

                    pointHitRadius: 10,

                     data:oriValuesZ,

                     spanGaps:false,

                 },

                 {

                     label:"sqrt",

                     fill:false,

                    lineTension: 0.1,

                    backgroundColor: "rgba(54, 162, 235, 0.2)",

                    borderColor: "rgba(54, 162, 235, 1)",

                    borderCapStyle: \'butt\',

                    borderDash: [],

                    borderDashOffset: 0.0,

                    borderJoinStyle: \'miter\',

                    pointBorderColor: "rgba(54, 162, 235, 1)",

                    pointBackgroundColor: "#fff",

                    pointBorderWidth: 1,

                    pointHoverRadius: 5,

                    pointHoverBackgroundColor: "rgba(54, 162, 235, 1)",

                    pointHoverBorderColor: "rgba(220,220,220,1)",

                    pointHoverBorderWidth: 2,

                    pointRadius: 1,

                    pointHitRadius: 10,

                     data:oriValuesSqrt,

                     spanGaps:false,

                 }

              ]

           },

           options:{

              scales: {

                 yAxes: [{

                     ticks:{

                        beginAtZero: true

                     }

                 }]

              }

           }

       });

    };

最后再在此script前面加上:

<canvas id="myChart" width="400" height="400"></canvas>
<div class="data"></div>

大功告成,但这个必须在手机上运行才有数据,因为现今的电脑浏览器不能模拟加速度