ChartValueErrorBarType Enum

Lists algorithms that calculate error bar values.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v24.1.dll

NuGet Package: DevExpress.Blazor

Declaration

public enum ChartValueErrorBarType

Members

Name	Description
None	Obtains error values from data source fields specified by HighValueField and LowValueField properties.
Percent	Error bars display percentage of argument values. Percentage factor is specified by the Value property.
StdError	Indicates the standard error. You can specify a coefficient to adjust the function result (use the Value property).
StdDeviation	Indicates the standard deviation. You can specify a coefficient to adjust the function result (use the Value property).
Variance	Indicates variance. You can specify a coefficient to adjust the function result (use the Value property).
Fixed	Error bars display constant values specified by the Value property.

Related API Members

The following properties accept/return ChartValueErrorBarType values:

• DxChartSeriesValueErrorBar.Type

Remarks

The Type property specifies how a chart calculates or where it obtains error bar values. All available methods can be grouped into three categories:

• Calculate statistical functions. When the Type property is set to Variance, StdError, or StdDeviation, the control calculates the specified function and displays its value as error bars. Note that you can adjust the result by a coefficient assigned to the Value property. The default coefficient is 1.

• Display fixed or percentage bars. Set the Type property to Fixed or Percent, and use the Value property to specify a fixed error value or a percentage (applied to the current series point value).

• Obtain error values from a data source. When the Type property is set to None or unspecified, use HighValueField and LowValueField properties to specify data source fields that contain error values.

Razor

@inject IChartAverageTemperatureDataProvider ChartAverageTemperatureDataProvider
<DxChart Data="@DataSource">
    @* ... *@
    <DxChartLineSeries Pane="TopPane"
                       Name="@LineSeriesName"
                       ArgumentField="@((AverageTemperatureData i) => i.Month)"
                       ValueField="@((AverageTemperatureData i) => i.AverageTemperature)">
        <DxChartSeriesValueErrorBar LowValueField="@nameof(AverageTemperatureData.AverageLowTemperature)"
                                    HighValueField="@nameof(AverageTemperatureData.AverageHighTemperature)"
                                    LineWidth="1"
                                    Opacity="0.8"/>
    </DxChartLineSeries>
    <DxChartBarSeries Pane="BottomPane"
                      Name="@BarSeriesName"
                      ArgumentField="@((AverageTemperatureData i) => i.Month)"
                      ValueField="@((AverageTemperatureData i) => i.AverageHumidity)">
        <DxChartSeriesValueErrorBar Type="ChartValueErrorBarType.Fixed"
                                    Value="@ErrorBarValue"
                                    LineWidth="1" />
    </DxChartBarSeries>
    @* ... *@
</DxChart>

@code {
    IEnumerable<AverageTemperatureData> DataSource = Enumerable.Empty<AverageTemperatureData>();
    double ErrorBarValue = 6;
    protected override void OnInitialized() {
        DataSource = ChartAverageTemperatureDataProvider.GenerateData();
    }
    // ...
}

DataSource.cs

public List<AverageTemperatureData> GenerateData() {
    List<AverageTemperatureData> result = new List<AverageTemperatureData> {
        // ...
        new AverageTemperatureData {
            Month = "March",
            AverageTemperature = 15.6,
            AverageLowTemperature = 10.6,
            AverageHighTemperature = 20.4,
            AverageHumidity = 79
        },
        // ...
    };
    return result;
}