SwiftPlotSeriesView Class

Represents a series view of the Swift Plot type.

Assembly: DevExpress.XtraCharts.v21.2.dll

Declaration

C#
VB.NET

public class SwiftPlotSeriesView :
    SwiftPlotSeriesViewBase,
    ILineSeriesView

Public Class SwiftPlotSeriesView
    Inherits SwiftPlotSeriesViewBase
    Implements ILineSeriesView

Remarks

The SwiftPlotSeriesView class provides the view-type-specific functionality for Swift Plot series within a chart control.

In addition to the settings inherited from the base SwiftPlotSeriesViewBase class, the SwiftPlotSeriesView class implements specific properties that allow you to adjust the appearance of a Swift Plot series (SwiftPlotSeriesView.Antialiasing and SwiftPlotSeriesView.LineStyle).

Note that a particular view type can be defined for a series via its SeriesBase.View property.

For more information, refer to Swift Plot Series View.

Example

This example demonstrates how to create a real-time chart (which is updated in a very short period of time), based on the Swift Plot.

Note that this series view type is associated with the Swift Plot Diagram type, and you should cast your diagram object to this type, in order to access its specific options.

C#
VB.NET

using System;
using System.Windows.Forms;
using DevExpress.XtraCharts;
// ...

const int interval = 20;
Random random = new Random();
int TimeInterval = 10;
double value1 = 10.0;

AxisRange AxisXRange {
    get {
        SwiftPlotDiagram diagram = chartControl1.Diagram as SwiftPlotDiagram;
        if (diagram != null)
            return diagram.AxisX.Range;
        return null;
    }
}

double CalculateNextValue(double value) {
    return value + (random.NextDouble() * 10.0 - 5.0);
}

void UpdateValues() {
    value1 = CalculateNextValue(value1);
}

private void timer1_Tick(object sender, EventArgs e) {
    Series series1 = chartControl1.Series[0];

    if (series1 == null)
        return;
    DateTime argument = DateTime.Now;
    SeriesPoint[] pointsToUpdate1 = new SeriesPoint[interval];
    for (int i = 0; i < interval; i++) {
        pointsToUpdate1[i] = new SeriesPoint(argument, value1);
        argument = argument.AddMilliseconds(1);
        UpdateValues();
    }
    DateTime minDate = argument.AddSeconds(-TimeInterval);
    int pointsToRemoveCount = 0;
    foreach (SeriesPoint point in series1.Points)
        if (point.DateTimeArgument < minDate)
            pointsToRemoveCount++;
    if (pointsToRemoveCount < series1.Points.Count)
        pointsToRemoveCount--;
    series1.Points.AddRange(pointsToUpdate1);
    if (pointsToRemoveCount > 0) {
        series1.Points.RemoveRange(0, pointsToRemoveCount);
    }
    if (AxisXRange != null) {
        AxisXRange.SetMinMaxValues(minDate, argument);
    }
}

Imports System
Imports System.Windows.Forms
Imports DevExpress.XtraCharts
' ...

Private Const interval As Integer = 20
    Private random As New Random()
    Private TimeInterval As Integer = 10
    Private value1 As Double = 10.0

    Private ReadOnly Property AxisXRange() As AxisRange
    Get
        Dim diagram As SwiftPlotDiagram = TryCast(chartControl1.Diagram, SwiftPlotDiagram)
        If diagram IsNot Nothing Then
            Return diagram.AxisX.Range
        End If
        Return Nothing
    End Get
End Property

Private Function CalculateNextValue(ByVal value As Double) As Double
    Return value + (random.NextDouble() * 10.0 - 5.0)
End Function

Private Sub UpdateValues()
    value1 = CalculateNextValue(value1)
End Sub

Private Sub timer1_Tick(ByVal sender As Object, ByVal e As EventArgs) Handles timer1.Tick
    Dim series1 As Series = chartControl1.Series(0)

    If series1 Is Nothing Then
        Return
    End If
    Dim argument As DateTime = DateTime.Now
    Dim pointsToUpdate1(interval - 1) As SeriesPoint
    For i As Integer = 0 To interval - 1
        pointsToUpdate1(i) = New SeriesPoint(argument, value1)
        argument = argument.AddMilliseconds(1)
        UpdateValues()
    Next i
    Dim minDate As DateTime = argument.AddSeconds(-TimeInterval)
    Dim pointsToRemoveCount As Integer = 0
    For Each point As SeriesPoint In series1.Points
        If point.DateTimeArgument < minDate Then
            pointsToRemoveCount += 1
        End If
    Next point
    If pointsToRemoveCount < series1.Points.Count Then
        pointsToRemoveCount -= 1
    End If
    series1.Points.AddRange(pointsToUpdate1)
    If pointsToRemoveCount > 0 Then
        series1.Points.RemoveRange(0, pointsToRemoveCount)
    End If
    If AxisXRange IsNot Nothing Then
        AxisXRange.SetMinMaxValues(minDate, argument)
    End If
End Sub