LineSeries - Interpolated Points

Sep 4, 2013 at 3:04 PM
Hello guys!

For my application I need the all points of a Line Series ... let me explain better:

Suppose I give two points to my Line Series, (0,0) and (10,10), OxyPlot will automatically plot the points between this two points.

It´s possible that I get this point list (the interpolated ones) ? For me will be nice, otherwise I will has to add a interpolate algorithm just to calculate then ....

Thx all
Coordinator
Sep 4, 2013 at 7:05 PM
The smoothed points is a private member of the LineSeries class. I don't want to expose this.
You find the algorithm for the canonical splines in CanonicalSplineHelper.cs
Nov 1, 2013 at 4:24 PM
Edited Nov 1, 2013 at 4:49 PM
If you would like to add more points from key points in lineseries here's code
/// <summary>
/// Interpulate LineSeries data points for linear slopes
/// </summary>        
public static List<IDataPoint> InterpulateLinearLines(List<IDataPoint> points, double intervalX)
{
    List<IDataPoint> pointsReturn = new List<IDataPoint>();

    double x = 0.0;
    double xPrev = -1.0;

    while (x != xPrev)
    {
        xPrev = x;
        IDataPoint point1 = null;
        IDataPoint point2 = null;

        foreach (IDataPoint pointKey in points)
        {
            if (pointKey.X <= x)
            {
                point1 = pointKey;
            }
            else if (point1 != null)
            {
                point2 = pointKey;
                break;
            }
        }
        if (point2 == null)
        {
            point2 = points[points.Count - 1];
        }

        {
            double sideA1 = point2.Y - point1.Y;
            double sideA2 = 0.0f;
            double sideB1 = point2.X - point1.X;
            double sideB2 = x - point1.X;

            if (sideB1 > 0.0)
            {
                IDataPoint pointCalc = new DataPoint();

                sideA2 = (sideA1 * sideB2) / sideB1;

                pointCalc.Y = point1.Y + sideA2;
                pointCalc.X = x;

                if(pointsReturn.Count > 0)
                {
                    foreach (IDataPoint pointKey in points)
                    {
                        if(pointsReturn[pointsReturn.Count -1].X < pointKey.X)
                        {
                            if (pointKey.X < pointCalc.X)
                            {
                                pointsReturn.Add(pointKey);                                        
                            }
                            break;
                        }
                    }
                }

                pointsReturn.Add(pointCalc);
            } 
            else
            {
                pointsReturn.Add(point1);
            }

        }

        x += intervalX;
        x = Math.Min(x, points[points.Count - 1].X);
    }

    return pointsReturn;
}
usage:
lineSeries.Points = HelperGraphs.InterpulateLinearLines(dataPointsRough, fTimeInterval);