Question

我正在尝试绘制一个包含三个Y轴和一个Date X轴的图表。当我解析我的Json时，我有这个数据数组：

var items = [
    {"CoplanarIrradiance": 760,"AirTemperature": 35,"SurfaceTemperature": 32,"Time": "2014-Apr        27T18:15:00"}, {"CoplanarIrradiance": 460,"AirTemperature": 25,"SurfaceTemperature": 31,"Time": "2014-Apr-27T18:30:00"}, {"CoplanarIrradiance": 341,"AirTemperature": 27,"SurfaceTemperature": 32,"Time": "2014-Apr-27T18:45:00"}, {"CoplanarIrradiance" 233,"AirTemperature": 31,"SurfaceTemperature": 32,"Time": "2014-Apr-27T19:00:00"}, ... ]

但是我没有画出图表。它只出现在X轴上，而且不正确。这是我的代码：

                     chart1.setDataSource(data);    


        // Eje de Tiempo (X)
        var axis = chart1.getAxisX().getLabelsFormat().setFormat(cfx.AxisFormat.Date);
        chart1.getAxisX().getLabelsFormat().setCustomFormat(";MMM-dd");

        // Eje de Coplanar Irradiance(Y)
        var axis1 = chart1.getAxisY();
        axis1.getTitle().setText("Coplanar Irradiance (W/m2)");
        axis1.getGrids().getMajor().setVisible(false);
        axis1.getDataFormat().setFormat(cfx.AxisFormat.Number);
        axis1.getDataFormat().setDecimals(2);

        // Eje de Air Temperature (Y)
        var axis2 = chart1.getAxisY2();
        axis2.getTitle().setText("Air Temperature (C)");
        axis2.setPosition(cfx.AxisPosition.Near);
        axis2.getGrids().getMajor().setVisible(false);
        chart1.getAxisY2().getDataFormat().setFormat(cfx.AxisFormat.Number);
        axis2.getDataFormat().setDecimals(2);

        // Eje de Surface Temperature (Y)
        var axis3 = new cfx.AxisY();
        chart1.getAxesY().add(axis3);
        axis3.getTitle().setText("Surface Temperature (C)");
        axis3.setVisible(true);
        axis3.setPosition(cfx.AxisPosition.Far);
        axis3.getLabelsFormat().setFormat(cfx.AxisFormat.Number);
        axis3.getDataFormat().setDecimals(2);

        // Especificamos que hay tres series de datos.
        chart1.getData().setSeries(3);

        var series1 = chart1.getSeries().getItem(0);
        var series2 = chart1.getSeries().getItem(1);
        var series3 = chart1.getSeries().getItem(2);

        series1.setAxisY(axis1);
        series2.setAxisY(axis2);
        series3.setAxisY(axis3);

        series1.setGallery(cfx.Gallery.Lines);
        series2.setGallery(cfx.Gallery.Lines);
        series3.setGallery(cfx.Gallery.Lines);

        // ----Assign data fields--------
        var fields = chart1.getDataSourceSettings().getFields();

        var field = new cfx.FieldMap();
        var field2 = new cfx.FieldMap();
        var field3 = new cfx.FieldMap();

        field.setName("CoplanarIrradiance");
        field.setUsage(cfx.FieldUsage.Number);
        fields.add(field);

        field2.setName("AirTemperature");
        field2.setUsage(cfx.FieldUsage.Number);
        fields.add(field2);

        field3.setName("SurfaceTemperature");
        field3.setUsage(cfx.FieldUsage.Number);
        fields.add(field3);

        var legendBox = chart1.getLegendBox();
        legendBox.setDock(cfx.DockArea.Bottom);
        legendBox.setContentLayout(cfx.ContentLayout.Center);

        // ----Set Sample Data------------
        var divHolder = document.getElementById('meteo_pop_up_grafica_imagen');
        chart1.create(divHolder);

这是结果图表：

enter image description here

有什么问题？数据集是正确的。

提前致谢

Answer 1

我只能看到您正在使用的代码存在一两个问题：

数据源中的日期时间字段必须以ISO 8601格式确认yyyy-MM-ddTHH：mm：ss.fffZ，例如2014-04-27T18：15：00.000Z。
我们了解到您只包含了一小部分数据源，原始来源可能包含几天的日期。如果是这种情况，在X轴上使用日期格式将是正确的。但是，如果您想传递较小的数据集并主要关注时间而不是日期，则应格式化X轴以使用时间。

其余的代码完全正常。使用最新版本的jChartFX和下面的代码（这几乎是你上面提到的两个更改的代码），我得到了预期的图表。

var items = [
    { "CoplanarIrradiance": 760, "AirTemperature": 35, "SurfaceTemperature": 32, "Time": "2014-04-27T18:15:00.000Z" },
    { "CoplanarIrradiance": 460, "AirTemperature": 25, "SurfaceTemperature": 31, "Time": "2014-04-27T18:30:00.000Z" },
    { "CoplanarIrradiance": 341, "AirTemperature": 27, "SurfaceTemperature": 32, "Time": "2014-04-27T18:45:00.000Z" },
    { "CoplanarIrradiance": 233, "AirTemperature": 31, "SurfaceTemperature": 32, "Time": "2014-04-27T19:00:00.000Z" }
];


chart1.setDataSource(items);

// Eje de Tiempo (X)
var axisX = chart1.getAxisX();
axisX.getLabelsFormat().setFormat(cfx.AxisFormat.Time);

//var axis = chart1.getAxisX().getLabelsFormat().setFormat(cfx.AxisFormat.Date);
//chart1.getAxisX().getLabelsFormat().setCustomFormat(";MMM-dd");

// Eje de Coplanar Irradiance(Y)
var axis1 = chart1.getAxisY();
axis1.getTitle().setText("Coplanar Irradiance (W/m2)");
axis1.getGrids().getMajor().setVisible(false);
axis1.getDataFormat().setFormat(cfx.AxisFormat.Number);
axis1.getDataFormat().setDecimals(2);

// Eje de Air Temperature (Y)
var axis2 = chart1.getAxisY2();
axis2.getTitle().setText("Air Temperature (C)");
axis2.setPosition(cfx.AxisPosition.Near);
axis2.getGrids().getMajor().setVisible(false);
chart1.getAxisY2().getDataFormat().setFormat(cfx.AxisFormat.Number);
axis2.getDataFormat().setDecimals(2);

// Eje de Surface Temperature (Y)
var axis3 = new cfx.AxisY();
chart1.getAxesY().add(axis3);
axis3.getTitle().setText("Surface Temperature (C)");
axis3.setVisible(true);
axis3.setPosition(cfx.AxisPosition.Far);
axis3.getLabelsFormat().setFormat(cfx.AxisFormat.Number);
axis3.getDataFormat().setDecimals(2);

// Especificamos que hay tres series de datos.
chart1.getData().setSeries(3);

var series1 = chart1.getSeries().getItem(0);
var series2 = chart1.getSeries().getItem(1);
var series3 = chart1.getSeries().getItem(2);

series1.setAxisY(axis1);
series2.setAxisY(axis2);
series3.setAxisY(axis3);

series1.setGallery(cfx.Gallery.Lines);
series2.setGallery(cfx.Gallery.Lines);
series3.setGallery(cfx.Gallery.Lines);

// ----Assign data fields--------
var fields = chart1.getDataSourceSettings().getFields();

var field = new cfx.FieldMap();
var field2 = new cfx.FieldMap();
var field3 = new cfx.FieldMap();

field.setName("CoplanarIrradiance");
field.setUsage(cfx.FieldUsage.Number);
fields.add(field);

field2.setName("AirTemperature");
field2.setUsage(cfx.FieldUsage.Number);
fields.add(field2);

field3.setName("SurfaceTemperature");
field3.setUsage(cfx.FieldUsage.Number);
fields.add(field3);

var legendBox = chart1.getLegendBox();
legendBox.setDock(cfx.DockArea.Bottom);
legendBox.setContentLayout(cfx.ContentLayout.Center);

确保使用最新的位。

我希望这会有所帮助。

我无法使用JChartFX在多Y轴和日期X轴图表中显示任何内容

1 个答案: