Actualizar dinámicamente los valores de un gráfico chartjs

Creé un gráfico de barras básico usando chartjs y funciona bien. Ahora quiero actualizar los valores en un intervalo de tiempo. Mi problema es que después de crear el gráfico, no sé cómo actualizar sus valores correctamente ...

Mi código:

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);

en el código de prueba, estoy actualizando los valores con datasets[0].data: ¿es esta la forma correcta de hacerlo? El problema con esto es que cada vez que llamo chart.Bar(), los valores se restablecen a 0 y luego se animan al valor aleatorio (como si estuviera recreando el gráfico). De esta manera, todas las animaciones son siempre de 0 a valor, lo que parece extraño. Esperaría que si actualizo un valor de 50 a 10, la barra se reducirá a 10 de 50 y no se establecerá en 0 y luego se animará a 10.

No encontré nada en los documentos sobre esto ... ¿Estoy haciendo algo mal o esto es imposible con esta biblioteca?

Actualización: Parece que chartjs ha sido actualizado (ver comentario más abajo). Hay algunos ejemplos que se ven muy bien:

1. Aquí hay un ejemplo de actualización de un gráfico de líneas utilizando datos nuevos: http://jsbin.com/yitep/5/edit
2. Así es como podemos actualizar los datos existentes en un gráfico de líneas: http://jsbin.com/yitep/4/edit

Publicación original

A partir de noviembre de 2013, parece haber muy pocas opciones para actualizar los gráficos.

Aquí hay un buen ejemplo (duplicado a continuación) de agregar nuevos puntos a un gráfico de líneas. Todavía un poco nervioso, pero no está mal. Sin embargo, creo que el efecto probablemente depende de la tabla que está utilizando.

Parece que esto está en algún lugar de la tubería de desarrollo. Sin embargo, todavía no veo ninguna indicación de una fecha de lanzamiento: https://github.com/nnnick/Chart.js/issues/13 [Cerrado a partir del 26 de julio de 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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