javascript - chart.js 2，动画从右到左(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，您会看到数据点自上而下动画而不是向左移动的不良行为。这非常让人分心。

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向左移动，新插入的数据点出现在右边？与分散注意力的波浪动画相反？

谢谢

Answer 1

此代码使用 streaming plugin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
            }
        }
    }
});