动态更新Chart.js图表​​的值

我使用chartjs创建了一个基本的条形图，并且效果很好。现在，我想基于时间间隔更新值。我的问题是创建图表后，我不知道如何正确更新其值...

我的代码：

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);

在测试代​​码中，我正在使用更新值datasets[0].data-这是正确的方法吗？问题在于，每次调用时chart.Bar()，值都会重置为0，然后设置为随机值（例如，我正在重新创建图表）。这样，所有动画总是从0到看起来奇怪的值。我希望如果将值从50更新为10，则小节会从50降至10，而不是设置为0，然后设置为10。

我没有在文档中找到与此相关的任何内容...我是在做错什么还是该库无法做到这一点？

更新：好像chartjs已更新（请参阅下面的评论）。上面有一些很好看的例子：

1. 以下是使用新数据更新折线图的示例：http : //jsbin.com/yitep/5/edit
2. 这是我们如何更新折线图上的现有数据：http : //jsbin.com/yitep/4/edit

原始帖子

截至2013年11月，似乎很少有更新图表的选项。

这里有一个很好的示例（在下面重复），将新点添加到折线图中。仍然有点跳动，但还算不错。但是，我认为效果可能取决于您使用的图表。

看起来确实在开发管道中。我还没有发布日期的迹象：https：//github.com/nnnick/Chart.js/issues/13 [截至2014年7月26日关闭]

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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