/// <summary>
/// Interpolates at indices which are obtained using <paramref name="samplingStep"/>.
/// <para>Distances between points do not have to be equal because control points may not be equally distributed.</para>
/// <para>For equally distributed points please use: <seealso cref="GetEqualyDistributedPointIndices"/>.</para>
/// </summary>
/// <param name="controlPoints">Control points of the spline.</param>
/// <param name="tension">Tension of the spline.</param>
/// <param name="samplingStep">Index increase factor.</param>
/// <returns>Interpolated points.</returns>
public static IEnumerable <PointF> Interpolate(IList <PointF> controlPoints, float tension, float samplingStep = 0.3f)
{
//interpolate points
for (float i = MIN_INDEX; i < (controlPoints.Count - 1 - MAX_INDEX_OFFSET); i += samplingStep)
{
var pt = CardinalSpline.InterpolateAt(controlPoints, tension, i);
yield return(pt);
}
}
/// <summary>
/// Interpolates points and defined indices.
/// </summary>
/// <param name="controlPoints">Control points of the spline.</param>
/// <param name="tension">Tension of the spline.</param>
/// <param name="indices">Indices where to interpolate values.</param>
/// <returns>Interpolated points.</returns>
public static IEnumerable <PointF> InterpolateAt(IList <PointF> controlPoints, float tension, IEnumerable <float> indices)
{
return(indices.Select(x => CardinalSpline.InterpolateAt(controlPoints, tension, x)));
}