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Box Plot Chart
The Box Plot (also called Box-and-Whisker Plot) chart is used to analyze statistic-driven data points. To draw a Box Plot point, you must pass the Min, Quartile1, Median, Quartile3 and Max parameters. You can optionally display a set of Outliers and a Mean value.
Demo: Box Plot
 
Chart Type Characteristics
The table below lists the main box plot chart characteristics:
| Feature |
Value |
| Series view type |
BoxPlotSeriesView |
| Diagram type |
2D XYDiagram |
| Number of arguments per series point |
1 |
| Number of values per series point |
7 |
The following image shows the Box Plot chart elements:
Limitations
The Box Plot series view does not support series labels.
Create a Box Plot Chart
The following example demonstrates how to create a Box Plot chart with three points:
- Add a chart to the WinForms project and specify the chart's data source.
- Create a new series and add it to the chart. Set its view type to BoxPlot.
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Specify data members for the series.
You can call the SeriesBase.SetBoxPlotDataMembersWithOutliers method to pass all the data member names as parameters. To create a chart without outliers, use the SeriesBase.SetBoxPlotDataMembers method.
To keep the Mean parameter undefined, pass the MeanDataMember parameter as null or an empty string to the SeriesBase.SetBoxPlotDataMembersWithOutliers (SeriesBase.SetBoxPlotDataMembers) method. If you manually add SeriesPoint objects to the Series.Points collection, you can set the SeriesPoint.Values value to double.NaN, DateTime.MinValue or TimeSpan.Zero.
| C# |
using DevExpress.XtraCharts;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
namespace BoxPlotChart {
public partial class Form1 : Form {
public Form1() {
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e) {
Series series = new Series("Box Plot", ViewType.BoxPlot);
series.DataSource = DataPoint.GetDataPoints();
series.SetBoxPlotDataMembersWithOutliers("Argument", "Min", "Quartile1", "Median", "Quartile3", "Max", "Mean", "Outliers");
chartControl1.Series.Add(series);
}
}
public class DataPoint {
public string Argument { get; set; }
public double Min { get; set; }
public double Max { get; set; }
public double Quartile1 { get; set; }
public double Quartile3 { get; set; }
public double Median { get; set; }
public double Mean { get; set; }
public double[] Outliers { get; set; }
public DataPoint(string argument, double min, double max, double q1, double q3, double median, double mean, double[] outliers) {
this.Argument = argument;
this.Min = min;
this.Max = max;
this.Quartile1 = q1;
this.Quartile3 = q3;
this.Median = median;
this.Mean = mean;
this.Outliers = outliers;
}
public static List<DataPoint> GetDataPoints() {
List<DataPoint> data = new List<DataPoint> {
new DataPoint("June", 46, 94, 64, 76, 70, 73, new double[]{ 30, 96.3, 99.56 }),
new DataPoint("July", 33, 121, 66, 88, 77, 75, new double[]{ 20, 22, 132.7 }),
new DataPoint("August", 10, 90, 40, 60, 50, 55, new double[]{ 4, 5, 95.4, 99.3, 109 })
};
return data;
}
}
}
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| VB |
Imports DevExpress.XtraCharts
Imports System
Imports System.Collections.Generic
Imports System.Drawing
Imports System.Windows.Forms
Namespace BoxPlotChart
Public Partial Class Form1
Inherits Form
Public Sub New()
InitializeComponent()
End Sub
Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
Dim series As Series = New Series("Box Plot", ViewType.BoxPlot)
series.DataSource = DataPoint.GetDataPoints()
series.SetBoxPlotDataMembersWithOutliers("Argument", "Min", "Quartile1", "Median", "Quartile3", "Max", "Mean", "Outliers")
chartControl1.Series.Add(series)
End Sub
End Class
Public Class DataPoint
Public Property Argument As String
Public Property Min As Double
Public Property Max As Double
Public Property Quartile1 As Double
Public Property Quartile3 As Double
Public Property Median As Double
Public Property Mean As Double
Public Property Outliers As Double()
Public Sub New(ByVal argument As String, ByVal min As Double, ByVal max As Double, ByVal q1 As Double, ByVal q3 As Double, ByVal median As Double, ByVal mean As Double, ByVal outliers As Double())
Me.Argument = argument
Me.Min = min
Me.Max = max
Me.Quartile1 = q1
Me.Quartile3 = q3
Me.Median = median
Me.Mean = mean
Me.Outliers = outliers
End Sub
Public Shared Function GetDataPoints() As List(Of DataPoint)
Dim data As List(Of DataPoint) = New List(Of DataPoint) From {
New DataPoint("June", 46, 94, 64, 76, 70, 73, New Double() {30, 96.3, 99.56}),
New DataPoint("July", 33, 121, 66, 88, 77, 75, New Double() {20, 22, 132.7}),
New DataPoint("August", 10, 90, 40, 60, 50, 55, New Double() {4, 5, 95.4, 99.3, 109})
}
Return data
End Function
End Class
End Namespace
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Format the Crosshair Label
Use the SeriesBase.CrosshairLabelPattern property to format the crosshair label text.
The Chart Control provides the following placeholders that you can use in patterns:
| Placeholder |
Description |
| {BP_MIN} |
Displays the Box Plot point's Minimum value. |
| {BP_Q1} |
Displays the Box Plot point's First Quartile value. |
| {BP_MDN} |
Displays the Box Plot point's Median value. |
| {BP_AVG} |
Displays the Box Plot point's Mean value. |
| {BP_Q3} |
Displays the Box Plot point's Third Quartile value. |
| {BP_MAX} |
Displays the Box Plot point's Maximum value. |
| C# |
series.CrosshairLabelPattern = "{A}" + Environment.NewLine +
"Min: {BP_MIN}" + Environment.NewLine +
"Q1: {BP_Q1}" + Environment.NewLine +
"Q3: {BP_Q3}" + Environment.NewLine +
"Max: {BP_MAX}";
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| VB |
series.CrosshairLabelPattern = "{A}" & Environment.NewLine & "Min: {BP_MIN}" + Environment.NewLine & "Q1: {BP_Q1}" + Environment.NewLine & "Q3: {BP_Q3}" + Environment.NewLine & "Max: {BP_MAX}"
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You can use Format Specifiers to format values that the placeholders show. For example, the "{BP_Q1:f1}" pattern displays the First Quartile value with one digit after a comma.
Change Chart Appearance
This section explains how to modify the Box Plot chart appearance as follows:
The BoxPlotSeriesView class exposes the following appearance settings for the Box Plot chart:
| C# |
BoxPlotSeriesView view = series.View as BoxPlotSeriesView;
view.Color = Color.CadetBlue;
view.CapWidthPercentage = 50;
view.MeanAndMedianColor = Color.Black;
view.MeanMarkerKind = MarkerKind.ThinCross;
view.MeanMarkerSize = 10;
view.Border.Color = Color.Black;
view.Border.Thickness = 1;
view.Border.Visibility = DevExpress.Utils.DefaultBoolean.True;
view.LineThickness = 1;
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| VB |
Dim view As BoxPlotSeriesView = TryCast(series.View, BoxPlotSeriesView)
view.Color = Color.CadetBlue
view.CapWidthPercentage = 50
view.MeanAndMedianColor = Color.Black
view.MeanMarkerKind = MarkerKind.ThinCross
view.MeanMarkerSize = 10
view.Border.Color = Color.Black
view.Border.Thickness = 1
view.Border.Visibility = DevExpress.Utils.DefaultBoolean.[True]
view.LineThickness = 1
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