缩小删除日期但保留时间

Question

当我放大我的图表时，我可以看到像 26 Apr, 9:05 这样的日期，但是当我缩小我的图表时，我只能看到像 9:00 这样的时间。我怎样才能一直显示日期？这是我的图表 (https://codepen.io/anon/pen/GLPPGq) :

am4core.useTheme(am4themes_animated);
var chart = am4core.create("chartdiv", am4charts.XYChart);

chart.dataSource.url = "https://api.myjson.com/bins/i3np8";

chart.dataSource.events.on("parseended", function(ev) {
    var data = ev.target.data;
    data.sort(function(lhs, rhs) {
        return lhs.time - rhs.time;
    });
    data.forEach(function(item) {
        item.time *= 1000;
    });
});

chart.numberFormatter.numberFormat = "#.0b";

chart.dateFormatter.inputDateFormat = "x";
var dateAxis = chart.xAxes.push(new am4charts.DateAxis());

dateAxis.dateFormats.setKey("minute", "d MMM, \nHH:mm");
dateAxis.periodChangeDateFormats.setKey("minute", "d MMM, \nHH:mm");
dateAxis.startLocation = 0.5;
dateAxis.endLocation = 0.5;

var valueAxis = chart.yAxes.push(new am4charts.ValueAxis());
valueAxis.tooltip.disabled = true;

var series = chart.series.push(new am4charts.LineSeries());
series.dataFields.dateX = "time";
series.name = "Traffic out";
series.dataFields.valueY = "outDiffFormatted";
series.tooltipHTML = "<span style='font-size:14px; color:#000000;'><b>{valueY.value}</b></span>";
series.tooltipText = "[#000]{valueY.value}[/]";
series.tooltip.background.fill = am4core.color("#FFF");
series.tooltip.getStrokeFromObject = true;
series.tooltip.background.strokeWidth = 3;
series.tooltip.getFillFromObject = false;
series.fillOpacity = 0.6;
series.strokeWidth = 2;
series.stacked = false;

var series2 = chart.series.push(new am4charts.LineSeries());
series2.dataFields.dateX = "time";
series2.name = "Traffic in";
series2.dataFields.valueY = "inDiffFormatted";
series2.tooltipHTML = "<span style='font-size:14px; color:#000000;'><b>{valueY.value}</b></span>";
series2.tooltipText = "[#000]{valueY.value}[/]";
series2.tooltip.background.fill = am4core.color("#FFF");
series2.tooltip.getFillFromObject = false;
series2.tooltip.getStrokeFromObject = true;
series2.tooltip.background.strokeWidth = 3;
series2.sequencedInterpolation = true;
series2.fillOpacity = 0.5;
series2.stacked = false;
series2.strokeWidth = 2;

chart.cursor = new am4charts.XYCursor();
chart.cursor.lineY.opacity = 0;
chart.cursor.xAxis = dateAxis;
chart.scrollbarX = new am4charts.XYChartScrollbar();
chart.scrollbarX.series.push(series);

chart.legend = new am4charts.Legend();
chart.legend.position = "top";

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

#chartdiv {
    width: 100%;
    height: 500px;
}

    <!DOCTYPE html>
    <html>
        <head>
        <style>

        </style>
        </head>
        <body>
            <script src="https://www.amcharts.com/lib/4/core.js"></script>
            <script src="https://www.amcharts.com/lib/4/charts.js"></script>
            <script src="https://www.amcharts.com/lib/4/themes/animated.js"></script>
            <div id="chartdiv"></div>
        </body>
    </html>

Answer 1

缩放时的时间变化是由于 AmCharts 处理周期的方式——当可见数据的时间跨度达到阈值时，图表会将格式升级或降级为不同周期的日期格式，以确保点更加可见.您可以通过修改 periodChangeDateFormats 和 dateFormats 中的格式来更改此设置，如 dateAxis 的 formatting date and time documentation 中所述：

dateAxis.dateFormats.setKey("hour", "d MMM,\nHH:mm");
dateAxis.periodChangeDateFormats.setKey("hour", "d MMM,\nHH:mm");

根据您的数据集大小，您需要在 baseInterval 下方 and/or 以上的多个时间段上设置此项，以确保各种缩放级别的所需输出。在您的情况下，除了 "minute".

之外，还向 "hour" 键添加格式

am4core.useTheme(am4themes_animated);
var chart = am4core.create("chartdiv", am4charts.XYChart);

chart.dataSource.url = "https://api.myjson.com/bins/i3np8";

chart.dataSource.events.on("parseended", function(ev) {
    var data = ev.target.data;
    data.sort(function(lhs, rhs) {
        return lhs.time - rhs.time;
    });
    data.forEach(function(item) {
        item.time *= 1000;
    });
});

chart.numberFormatter.numberFormat = "#.0b";

chart.dateFormatter.inputDateFormat = "x";
var dateAxis = chart.xAxes.push(new am4charts.DateAxis());

dateAxis.dateFormats.setKey("minute", "d MMM, \nHH:mm");
dateAxis.periodChangeDateFormats.setKey("minute", "d MMM, \nHH:mm");
dateAxis.dateFormats.setKey("hour", "d MMM, \nHH:mm");
dateAxis.periodChangeDateFormats.setKey("hour", "d MMM, \nHH:mm");
dateAxis.startLocation = 0.5;
dateAxis.endLocation = 0.5;

var valueAxis = chart.yAxes.push(new am4charts.ValueAxis());
valueAxis.tooltip.disabled = true;

var series = chart.series.push(new am4charts.LineSeries());
series.dataFields.dateX = "time";
series.name = "Traffic out";
series.dataFields.valueY = "outDiffFormatted";
series.tooltipHTML = "<span style='font-size:14px; color:#000000;'><b>{valueY.value}</b></span>";
series.tooltipText = "[#000]{valueY.value}[/]";
series.tooltip.background.fill = am4core.color("#FFF");
series.tooltip.getStrokeFromObject = true;
series.tooltip.background.strokeWidth = 3;
series.tooltip.getFillFromObject = false;
series.fillOpacity = 0.6;
series.strokeWidth = 2;
series.stacked = false;

var series2 = chart.series.push(new am4charts.LineSeries());
series2.dataFields.dateX = "time";
series2.name = "Traffic in";
series2.dataFields.valueY = "inDiffFormatted";
series2.tooltipHTML = "<span style='font-size:14px; color:#000000;'><b>{valueY.value}</b></span>";
series2.tooltipText = "[#000]{valueY.value}[/]";
series2.tooltip.background.fill = am4core.color("#FFF");
series2.tooltip.getFillFromObject = false;
series2.tooltip.getStrokeFromObject = true;
series2.tooltip.background.strokeWidth = 3;
series2.sequencedInterpolation = true;
series2.fillOpacity = 0.5;
series2.stacked = false;
series2.strokeWidth = 2;

chart.cursor = new am4charts.XYCursor();
chart.cursor.lineY.opacity = 0;
chart.cursor.xAxis = dateAxis;
chart.scrollbarX = new am4charts.XYChartScrollbar();
chart.scrollbarX.series.push(series);

chart.legend = new am4charts.Legend();
chart.legend.position = "top";

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

#chartdiv {
    width: 100%;
    height: 500px;
}

<!DOCTYPE html>
    <html>
        <head>
        <style>

        </style>
        </head>
        <body>
            <script src="https://www.amcharts.com/lib/4/core.js"></script>
            <script src="https://www.amcharts.com/lib/4/charts.js"></script>
            <script src="https://www.amcharts.com/lib/4/themes/animated.js"></script>
            <div id="chartdiv"></div>
        </body>
    </html>

缩小删除日期但保留时间

Zooming out remove date but keep time

javascript

charts

amcharts

amcharts4