Nevron .NET Vision
Chart for .NET / User's Guide / Chart Types / Smooth Line / Standard_Smooth_Line

In This Topic
    In This Topic

    Smooth Line charts are similar to Line charts, the difference being that the successive data points are connected with cubic spline segments instead of straight lines. The following images display Smooth Line charts.

    Figure 1.

     Creating a smooth line series

    Smooth Line series are represented by the NSmoothLineSeries type. An instance of this type must be added to the series collection of a Cartesian chart.

    Copy Code
    // obtain a reference to the Cartesian chart that is created by default
    NCartesianChart chart = (NCartesianChart)chartControl.Charts[0];
    // add a smooth line series to it
    NSmoothLineSeries smoothline = (NSmoothLineSeries)chart.Series.Add(SeriesType.SmoothLine);
    Visual Basic
    Copy Code
    ' obtain a reference to the Cartesian chart that is created by default
    Dim chart As NCartesianChart = chartControl.Charts(0)
    ' add a smooth line series to it
    Dim smoothline As NSmoothLineSeries = chart.Series.Add(SeriesType.SmoothLine)
     Passing Data
    Once the smooth line series is created you can add some data in it. Smooth line series use the Values data series for elevation values, the XValues data series - for x position values and the ZValues data series for depth position values. You can either manipulate directly these data series, or use the data point interface to add data. Please refer to the Working with Data Points topic for more information.
     Controlling the interpolation

    It is often required to place the data points at custom positions along the x axis. If you set the UseXValues property to true the smooth line will use the custom x coordinates specified in the XValues data series. In this case you are able to select the spline interpolation method with the help of the Use1DInterpolationForXYScatter property. If this property is set to true, the elevation values are regarded as a function of the x values. This means that there is always only one Y for every X coordinate. When the property is set to false, the line is interpolated as a free 2D line in the XY plane. The following figures show two curves produced from the same data, but with different interpolation methods.

    Demonstration of different interpolation modes
    1D interpolation 2D interpolation
     Related Examples
    Chart Gallery\Smooth Line\Standard Smooth Line
    Chart Gallery\Smooth Line\DateTime Smooth Line
    Chart Gallery\Smooth Line\XY Scatter Smooth Line
    Chart Gallery\Smooth Line\XYZ Scatter Smooth Line
    See Also