Memperbarui nilai bagan chartjs secara dinamis

Saya membuat diagram batang dasar menggunakan chartjs dan berfungsi dengan baik. Sekarang saya ingin memperbarui nilai pada interval berbasis waktu. Masalah saya adalah bahwa setelah saya membuat bagan, saya tidak tahu cara memperbarui nilainya dengan benar ...

Kode saya:

var ctx = $("#myChart").get(0).getContext("2d");

var dts = [
    {
        fillColor: "rgba(220,220,220,0.5)",
        strokeColor: "rgba(220,220,220,1)",
        data: [0, 0, 0, 0, 0]
    }
];

var data = {
    labels: ["Core#1", "Core#2", "Core#3", "Core#4", "Total"],
    datasets: dts
};

var chart = new Chart(ctx);
chart.Bar(data);

//test code
setInterval( function () {                        
    data.datasets[0].data = [random(), random(), random(), random(), random()];
    chart.Bar(data);

},2000);

dalam kode pengujian, saya memperbarui nilai dengan datasets[0].data- apakah ini cara yang tepat untuk melakukannya? Masalah dengan ini adalah bahwa setiap kali saya menelepon chart.Bar(), nilai-nilai diatur ulang ke 0 kemudian dianimasikan ke nilai acak (seperti saya membuat ulang grafik). Dengan cara ini, semua animasi selalu dari 0 ke nilai yang terlihat aneh. Saya berharap bahwa jika saya memperbarui nilai dari 50 ke 10 bar akan turun ke 10 dari 50 dan tidak puas ke 0 kemudian dianimasikan ke 10.

Saya tidak menemukan apa pun dalam dokumen tentang ini ... apakah saya melakukan sesuatu yang salah atau ini tidak mungkin dengan perpustakaan ini?

Pembaruan: Sepertinya chartjs telah diperbarui (lihat komentar di bawah). Ada beberapa contoh yang terlihat sangat bagus:

1. Berikut adalah contoh memperbarui bagan garis menggunakan data baru: http://jsbin.com/yitep/5/edit
2. Inilah cara kami dapat memperbarui data yang ada pada bagan garis: http://jsbin.com/yitep/4/edit

Pos Asli

Pada November 2013, tampaknya ada sangat sedikit opsi untuk memperbarui grafik.

Ada contoh yang baik di sini (digandakan di bawah) tentang menambahkan poin baru ke bagan garis. Masih agak gelisah tetapi tidak terlalu buruk. Namun, saya pikir efeknya mungkin tergantung pada grafik yang Anda gunakan.

Memang terlihat seperti ini di suatu tempat dalam pipa pengembangan. Saya belum melihat indikasi tanggal rilis: https://github.com/nnnick/Chart.js/issues/13 [Ditutup pada 26 Jul 2014]

JS

$(document).ready(function(){
  var count = 10;
  var data = {
      labels : ["1","2","3","4","5", "6", "7", "8", "9", "10"],
        datasets : [
          {
                fillColor : "rgba(220,220,220,0.5)",
                strokeColor : "rgba(220,220,220,1)",
                pointColor : "rgba(220,220,220,1)",
                pointStrokeColor : "#fff",
                data : [65,59,90,81,56,45,30,20,3,37]
            },
            {
                fillColor : "rgba(151,187,205,0.5)",
                strokeColor : "rgba(151,187,205,1)",
                pointColor : "rgba(151,187,205,1)",
                pointStrokeColor : "#fff",
                data : [28,48,40,19,96,87,66,97,92,85]
            }
        ]
  }
  // this is ugly, don't judge me
  var updateData = function(oldData){
    var labels = oldData["labels"];
    var dataSetA = oldData["datasets"][0]["data"];
    var dataSetB = oldData["datasets"][1]["data"];

    labels.shift();
    count++;
    labels.push(count.toString());
    var newDataA = dataSetA[9] + (20 - Math.floor(Math.random() * (41)));
    var newDataB = dataSetB[9] + (20 - Math.floor(Math.random() * (41)));
    dataSetA.push(newDataA);
    dataSetB.push(newDataB);
    dataSetA.shift();
    dataSetB.shift();    };

  var optionsAnimation = {
    //Boolean - If we want to override with a hard coded scale
    scaleOverride : true,
    //** Required if scaleOverride is true **
    //Number - The number of steps in a hard coded scale
    scaleSteps : 10,
    //Number - The value jump in the hard coded scale
    scaleStepWidth : 10,
    //Number - The scale starting value
    scaleStartValue : 0
  }

  // Not sure why the scaleOverride isn't working...
  var optionsNoAnimation = {
    animation : false,
    //Boolean - If we want to override with a hard coded scale
    scaleOverride : true,
    //** Required if scaleOverride is true **
    //Number - The number of steps in a hard coded scale
    scaleSteps : 20,
    //Number - The value jump in the hard coded scale
    scaleStepWidth : 10,
    //Number - The scale starting value
    scaleStartValue : 0
  }

  //Get the context of the canvas element we want to select
  var ctx = document.getElementById("myChart").getContext("2d");
  var optionsNoAnimation = {animation : false}
  var myNewChart = new Chart(ctx);
  myNewChart.Line(data, optionsAnimation);  

  setInterval(function(){
    updateData(data);
    myNewChart.Line(data, optionsNoAnimation)
    ;}, 2000
  );
});


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