Spline Area Chart

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Short Description

The Spline Area Chart is represented by the SplineAreaSeriesView object, which belongs to Area Series Views. This view is similar to the Area Chart, but plots a fitted curve through each data point in a series.

A Spline Area chart is shown in the image below. Note that this chart type is based upon the XYDiagram, so it can be rotated to show bars either vertically or horizontally.

SeriesView_SplineArea2d

Chart Type Characteristics

The table below lists the main characteristics of this chart type.

Feature Value
Series View type SplineAreaSeriesView
Diagram type 2D-XYDiagram
Number of arguments per series point 1
Number of values per series point 1
NOTE

For information on which chart types can be combined with the Spline Area Chart, refer to the following help topic: Combining Different Series Views.

Example

The following example creates a ChartControl with a series of the SplineAreaSeriesView type, sets its general properties, and adds this chart to a form at runtime. Before proceeding with this example, first create a Windows Forms Application in Visual Studio, and add all required assemblies to the project's References list.

Then, add the following code to the Form.Load event handler.

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

private void Form1_Load(object sender, EventArgs e) {
    // Create a new chart.
    ChartControl splineAreaChart = new ChartControl();

    // Create a spline area series.
    Series series1 = new Series("Series 1", ViewType.SplineArea);

    // Add points to it.
    series1.Points.Add(new SeriesPoint(1, 3));
    series1.Points.Add(new SeriesPoint(2, 12));
    series1.Points.Add(new SeriesPoint(3, 4));
    series1.Points.Add(new SeriesPoint(4, 17));
    series1.Points.Add(new SeriesPoint(5, 3));
    series1.Points.Add(new SeriesPoint(6, 12));
    series1.Points.Add(new SeriesPoint(7, 4));
    series1.Points.Add(new SeriesPoint(8, 17));

    // Add the series to the chart.
    splineAreaChart.Series.Add(series1);

    // Set the numerical argument scale types for the series,
    // as it is qualitative, by default.
    series1.ArgumentScaleType = ScaleType.Numerical;

    // Access the view-type-specific options of the series.
    ((SplineAreaSeriesView)series1.View).LineTensionPercent = 90;

    // Access the type-specific options of the diagram.
    ((XYDiagram)splineAreaChart.Diagram).AxisX.Range.SideMarginsEnabled = false;

    // Hide the legend (if necessary).
    splineAreaChart.Legend.Visible = false;

    // Add a title to the chart (if necessary).
    splineAreaChart.Titles.Add(new ChartTitle());
    splineAreaChart.Titles[0].Text = "A Spline Area Chart";

    // Add the chart to the form.
    splineAreaChart.Dock = DockStyle.Fill;
    this.Controls.Add(splineAreaChart);
}
TIP

For the complete sample project, see the following DevExpress Support Center example: http://www.devexpress.com/example=E1049.

See Also