Atualizar dinamicamente os valores de um gráfico chartjs

Eu criei um gráfico de barras básico usando chartjs e funciona bem. Agora eu quero atualizar os valores em um intervalo baseado em tempo. Meu problema é que, depois de criar o gráfico, não sei como atualizar seus valores corretamente ...

Meu 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);

no código de teste, estou atualizando os valores com datasets[0].data- esta é a maneira correta de fazer isso? O problema é que, toda vez que ligo chart.Bar(), os valores são redefinidos para 0 e animados para o valor aleatório (como eu estou recriando o gráfico). Dessa forma, todas as animações são sempre de 0 a valor, o que parece estranho. Eu esperaria que, se eu atualizasse um valor de 50 para 10, a barra diminuiria para 10 de 50 e não configurada para 0 e animada para 10.

Não encontrei nada nos documentos sobre isso ... estou fazendo algo errado ou isso é impossível com esta biblioteca?

Atualização: parece que o chartjs foi atualizado (veja o comentário abaixo). Existem alguns exemplos que parecem muito agradáveis:

1. Aqui está um exemplo de atualização de um gráfico de linhas usando novos dados: http://jsbin.com/yitep/5/edit
2. Veja como podemos atualizar os dados existentes em um gráfico de linhas: http://jsbin.com/yitep/4/edit

Correio Original

Desde novembro de 2013, parece haver poucas opções para atualizar gráficos.

Há um bom exemplo aqui (duplicado abaixo) de adição de novos pontos a um gráfico de linhas. Ainda meio nervoso, mas não tão ruim. No entanto, acho que o efeito provavelmente depende do gráfico que você está usando.

Parece que isso está em algum lugar no pipeline de desenvolvimento. Ainda não vejo nenhuma indicação de data de lançamento: https://github.com/nnnick/Chart.js/issues/13 [Encerrada em 26 de julho 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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