SwiftPlotSeriesView Class

Represents a series view of the Swift Plot type.

Namespace: DevExpress.XtraCharts

Assembly: DevExpress.XtraCharts.v20.1.dll

Declaration

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.

Examples

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.

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);
    }
}
See Also