Aggiorna dinamicamente i valori di un grafico chartjs

Ho creato un grafico a barre di base usando chartjs e funziona benissimo. Ora voglio aggiornare i valori su un intervallo basato sul tempo. Il mio problema è che dopo aver creato il grafico, non so come aggiornare correttamente i suoi valori ...

Il mio codice:

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);

nel codice di prova, sto aggiornando i valori con datasets[0].data- è questo il modo giusto di farlo? Il problema è che ogni volta che chiamo chart.Bar(), i valori vengono reimpostati su 0, quindi animati sul valore casuale (come se stessi ricreando il grafico). In questo modo, tutte le animazioni vanno sempre da 0 a valore che sembra strano. Mi aspetto che se aggiorno un valore da 50 a 10, la barra scenderà a 10 da 50 e non sia impostata su 0, quindi animata su 10.

Non ho trovato nulla nei documenti su questo ... sto facendo qualcosa di sbagliato o questo è impossibile con questa libreria?

Aggiornamento: sembra che chartjs sia stato aggiornato (vedi commento sotto). Ci sono alcuni esempi che sembrano molto belli:

1. Ecco un esempio di aggiornamento di un grafico a linee utilizzando nuovi dati: http://jsbin.com/yitep/5/edit
2. Ecco come possiamo aggiornare i dati esistenti su un grafico a linee: http://jsbin.com/yitep/4/edit

Posta originale

A partire da novembre 2013, sembrano esserci pochissime opzioni per l'aggiornamento dei grafici.

C'è un buon esempio qui (duplicato di seguito) di aggiungere nuovi punti a un grafico a linee. Ancora un po 'nervoso ma non troppo male. Tuttavia, penso che l'effetto probabilmente dipende dal grafico che stai utilizzando.

Sembra che questo sia da qualche parte nella pipeline di sviluppo. Non vedo ancora alcuna indicazione di una data di rilascio: https://github.com/nnnick/Chart.js/issues/13 [Chiuso il 26 luglio 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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