/// <summary>
/// Get the one and only CurveLoop if it exists and is non-empty, otherwise null.
/// </summary>
/// <returns>The one and only CurveLoop if it exists and is non-empty.</returns>
public CurveLoop GetTheCurveLoop()
{
if ((CurveLoops?.Count ?? 0) != 1)
{
return(null);
}
CurveLoop theCurveLoop = CurveLoops[0];
return(((theCurveLoop?.NumberOfCurves() ?? 0) > 0) ? theCurveLoop : null);
}
/// <summary>
/// Attempt to create a single curve from a curve loop composed of linear segments.
/// </summary>
/// <param name="curveLoop">The curve loop.</param>
/// <param name="pointXYZs">The original points from which the curve loop was created.</param>
/// <returns>The curve, if the curve loop is linear, or null.</returns>
/// <remarks>Note that the routine does not actually check that the curveLoop is composed
/// of line segments, or that the point array matches the curve loop in any way.</remarks>
public static Curve CreateCurveFromPolyCurveLoop(CurveLoop curveLoop, IList <XYZ> pointXYZs)
{
if (curveLoop == null)
{
return(null);
}
int numCurves = curveLoop.NumberOfCurves();
if (numCurves == 0)
{
return(null);
}
if (numCurves == 1)
{
Curve originalCurve = curveLoop.First();
if (originalCurve != null)
{
return(originalCurve.Clone());
}
return(null);
}
if (pointXYZs == null)
{
return(null);
}
int numPoints = pointXYZs.Count;
// If we are here, we are sure that the number of points must be at least 3.
XYZ firstPoint = pointXYZs[0];
XYZ secondPoint = pointXYZs[1];
XYZ vectorToTest = (secondPoint - firstPoint).Normalize();
bool allAreCollinear = true;
for (int ii = 2; ii < numPoints; ii++)
{
XYZ vectorTmp = (pointXYZs[ii] - firstPoint).Normalize();
if (!vectorTmp.IsAlmostEqualTo(vectorToTest))
{
allAreCollinear = false;
break;
}
}
if (allAreCollinear)
{
return(Line.CreateBound(firstPoint, pointXYZs[numPoints - 1]));
}
return(null);
}
/// <summary>
/// Set the representation of the curve based on one CurveLoop.
/// </summary>
/// <param name="curveLoop">The one CurveLoop.</param>
public void SetCurveLoop(CurveLoop curveLoop)
{
Curve = null;
CurveLoops = null;
if (curveLoop == null)
{
return;
}
if (curveLoop.NumberOfCurves() == 1)
{
Curve = curveLoop.GetCurveLoopIterator().Current;
}
CurveLoops = new List <CurveLoop>();
CurveLoops.Add(curveLoop);
}
