chart.js 2,从右到左动画(不是自上而下)

Question

下面的jsfiddle显示了问题.

第一个数据插入很好,但是当数据集的长度上限为10时,您会看到不希望的行为,其中数据点是自上而下动画而不是向左移动.这非常令人分心.

http://jsfiddle.net/kLg5ntou/32/

setInterval(function () {
 data.labels.push(Math.floor(Date.now() / 1000));
 data.datasets[0].data.push(Math.floor(10 + Math.random() * 80));

 // limit to 10
 data.labels = data.labels.splice(-10);
 data.datasets[0].data = data.datasets[0].data.splice(-10);

 chart.update(); // addData/removeData replaced with update in v2
}, 1000);

有没有办法让折线图左移,新插入的数据点出现在右边？与波浪分散动画相反？

谢谢

Answer 1

此代码使用流插件并按预期工作。

http://jsfiddle.net/nagix/kvu0r6j2/

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.22.2/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/chartjs-plugin-streaming@1.5.0/dist/chartjs-plugin-streaming.min.js"></script>

var ctx = document.getElementById("chart").getContext("2d");
var chart = new Chart(ctx, {
    type: 'line',
    data: {
        labels: [],
        datasets: [{
            label: "My First dataset",
            backgroundColor: "rgba(95,186,88,0.7)",
            borderColor: "rgba(95,186,88,1)",
            pointBackgroundColor: "rgba(0,0,0,0)",
            pointBorderColor: "rgba(0,0,0,0)",
            pointHoverBackgroundColor: "rgba(95,186,88,1)",
            pointHoverBorderColor: "rgba(95,186,88,1)",
            data: []
        }]
    },
    options: {
        scales: {
            xAxes: [{
                type: 'realtime'
            }]
        },
        plugins: {
            streaming: {
                onRefresh: function(chart) {
                    chart.data.labels.push(Date.now());
                    chart.data.datasets[0].data.push(
                        Math.floor(10 + Math.random() * 80)
                    );
                },
                delay: 2000
            }
        }
    }
});

Answer 2

你应该使用2.5.0的chartjs

在这里它有效： http: //jsfiddle.net/kLg5ntou/93

var data = {
labels: ["0", "1", "2", "3", "4", "5", "6"],
datasets: [
    {
        label: "My First dataset",
        fillColor: "rgba(95,186,88,0.7)",
        strokeColor: "rgba(95,186,88,1)",
        pointColor: "rgba(0,0,0,0)",
        pointStrokeColor: "rgba(0,0,0,0)",
        pointHighlightFill: "rgba(95,186,88,1)",
        pointHighlightStroke: "rgba(95,186,88,1)",
        data: [65, 59, 80, 81, 56, 55, 40]
    }
]
};

var ctx = document.getElementById("chart").getContext("2d");
var chart = new Chart(ctx, {type: 'line', data: data});

setInterval(function () {
 chart.config.data.labels.push(Math.floor(Date.now() / 1000));
 chart.config.data.datasets[0].data.push(Math.floor(10 + Math.random() * 80));
 // limit to 10
 chart.config.data.labels.shift();
 chart.config.data.datasets[0].data.shift();