public static IEnumerable <Term> Compute(CircleFeatureCurve item)
{
const int SAMPLE_SIZE = 20;
var sample = CurveSampler.UniformSample(item.SnappedTo, SAMPLE_SIZE);
return(Compute(item, sample));
}
protected IEnumerable <Term> ProjectionFit(CircleFeatureCurve item)
{
const int SAMPLE_SIZE = 10;
var sample = CurveSampler.UniformSample(item.SnappedTo, SAMPLE_SIZE);
return(ProjectionFit(item, sample));
}
/// <summary>
/// Checks weather a points sequence is the top-part of a cylinder, by comparing the center of the ellipse that best fits the points
/// sequence to the actual top center and bottom centers.
/// </summary>
/// <param name="points">The points sequence</param>
/// <param name="cylinder">The cylinder data</param>
/// <returns><c>true</c> if the best-fit-ellipse's center is closer to the top cylinder point than to the bottom.</returns>
public static bool IsTop(PointsSequence points, SnappedCylindricalPrimitive cylinder)
{
var top = new Point(cylinder.TopCenterResult.X, -cylinder.TopCenterResult.Y);
var bottom = new Point(cylinder.BottomCenterResult.X, -cylinder.BottomCenterResult.Y);
var samples = CurveSampler.UniformSample(points, 50);
var ellipse = EllipseFitter.Fit(samples);
// the points sequence is "top" if it is closer to the top center then it is to the bottom center.
if ((top - ellipse.Center).Length < (bottom - ellipse.Center).Length)
{
return(true);
}
else
{
return(false);
}
}
