NumericIntervalOptions.UnderflowValue Property

Gets or sets the end value for the interval that includes underflow values.

Namespace: DevExpress.XtraCharts

Assembly: DevExpress.XtraCharts.v24.2.dll

Declaration

C#

public double? UnderflowValue { get; set; }

VB.NET

Public Property UnderflowValue As Double?

Property Value

Type	Description
Nullable<Double>	A floating-point value that is the underflow interval’s threshold.

Property Paths

You can access this nested property as listed below:

Object Type	Path to UnderflowValue
NumericScaleOptions	.IntervalOptions .UnderflowValue

Remarks

The underflow interval is the leftmost interval and includes data points whose arguments are less than UnderflowValue.

Example

This example demonstrates how to create a histogram chart with bins of a given width.

C#

private void Form1_Load(object sender, EventArgs e) {
    // Load data to a chart.
    chartControl1.DataSource = LoadDataTableFromXml("..\\..\\Data\\CityWeather.xml", "CityWeather");
    Series series = new Series();
    series.ArgumentDataMember = "Temperature";
    SideBySideBarSeriesView view = series.View as SideBySideBarSeriesView;
    view.Border.Visibility = DevExpress.Utils.DefaultBoolean.True;
    view.BarWidth = 1;
    chartControl1.Series.Add(series);
    // Configure histogram options.
    XYDiagram diagram = chartControl1.Diagram as XYDiagram; 
    NumericScaleOptions scaleOptions = diagram.AxisX.NumericScaleOptions;
    scaleOptions.AggregateFunction = AggregateFunction.Histogram;
    scaleOptions.ScaleMode = ScaleMode.Interval;
    scaleOptions.IntervalOptions.DivisionMode = IntervalDivisionMode.Width;
    scaleOptions.IntervalOptions.Width = 10;
    scaleOptions.IntervalOptions.OverflowValue = 20;
    scaleOptions.IntervalOptions.UnderflowValue = -30;
    scaleOptions.IntervalOptions.Pattern = "{OB}{A1:F0} ― {A2:F0}{CB}";
    scaleOptions.IntervalOptions.OverflowValuePattern = "{OS} {A1}";
    scaleOptions.IntervalOptions.UnderflowValuePattern = "{US} {A2}";
    scaleOptions.IntervalOptions.GridLayoutMode = GridLayoutMode.GridShiftedLabelCentered;
    diagram.AxisX.GridLines.Visible = true;
    diagram.AxisX.Tickmarks.MinorVisible = false;
}
static DataTable LoadDataTableFromXml(string fileName, string tableName) {
    DataSet xmlDataSet = new DataSet();
    xmlDataSet.ReadXml(fileName);
    return xmlDataSet.Tables[tableName];
}

VB.NET

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
    ' Load data to a chart.
    chartControl1.DataSource = LoadDataTableFromXml("..\..\Data\CityWeather.xml", "CityWeather")
    Dim series As Series = New Series()
    series.ArgumentDataMember = "Temperature"
    Dim view As SideBySideBarSeriesView = TryCast(series.View, SideBySideBarSeriesView)
    view.Border.Visibility = DevExpress.Utils.DefaultBoolean.[True]
    view.BarWidth = 1
    chartControl1.Series.Add(series)
    ' Configure histogram options.
    Dim diagram As XYDiagram = TryCast(chartControl1.Diagram, XYDiagram)
    Dim scaleOptions As NumericScaleOptions = diagram.AxisX.NumericScaleOptions
    scaleOptions.AggregateFunction = AggregateFunction.Histogram
    scaleOptions.ScaleMode = ScaleMode.Interval
    scaleOptions.IntervalOptions.DivisionMode = IntervalDivisionMode.Width
    scaleOptions.IntervalOptions.Width = 10
    scaleOptions.IntervalOptions.OverflowValue = 20
    scaleOptions.IntervalOptions.UnderflowValue = -30
    scaleOptions.IntervalOptions.Pattern = "{OB}{A1:F0} ― {A2:F0}{CB}"
    scaleOptions.IntervalOptions.OverflowValuePattern = "{OS} {A1}"
    scaleOptions.IntervalOptions.UnderflowValuePattern = "{US} {A2}"    
    scaleOptions.IntervalOptions.GridLayoutMode = GridLayoutMode.GridShiftedLabelCentered
    diagram.AxisX.GridLines.Visible = True
    diagram.AxisX.Tickmarks.MinorVisible = False
End Sub
Private Shared Function LoadDataTableFromXml(ByVal fileName As String, ByVal tableName As String) As DataTable
    Dim xmlDataSet As DataSet = New DataSet()
    xmlDataSet.ReadXml(fileName)
    Return xmlDataSet.Tables(tableName)
End Function

The following API members configure the histogram options:

Member	Description
ScaleGridOptionsBase.AggregateFunction	Gets or sets the value indicating the aggregate function that should be used to relieve data.
ScaleOptionsBase.ScaleMode	Gets or sets the scale mode for an axis.
NumericScaleOptions.IntervalOptions	Stores options for numeric axis when its ScaleMode is Interval.
NumericIntervalOptions.DivisionMode	Specifies how to divide axis scale into intervals.
NumericIntervalOptions.Width	Gets or sets the interval size when DivisionMode is Width.
NumericIntervalOptions.OverflowValue	Gets or sets the start value for the interval that includes overflow values.
NumericIntervalOptions.UnderflowValue	Gets or sets the end value for the interval that includes underflow values.
IntervalOptionsBase.Pattern	Gets or sets a format string that configures text for the interval axis labels and crosshair labels.
IntervalOptionsBase.OverflowValuePattern	Gets or sets a format string that configures text for the overflow interval axis labels and crosshair labels.
IntervalOptionsBase.UnderflowValuePattern	Gets or sets a format string that configures text for the underflow interval axis labels and crosshair labels.
NumericIntervalOptions.GridLayoutMode	Gets or sets the value that specifies the alignment of grid lines, major tickmarks and axis labels.