/// <summary>
/// Overrides <see cref="CADability.GeoObject.ISurfaceImpl.GetPlaneIntersection (PlaneSurface, double, double, double, double, double)"/>
/// </summary>
/// <param name="pl"></param>
/// <param name="umin"></param>
/// <param name="umax"></param>
/// <param name="vmin"></param>
/// <param name="vmax"></param>
/// <param name="precision"></param>
/// <returns></returns>
public override IDualSurfaceCurve[] GetPlaneIntersection(PlaneSurface pl, double umin, double umax, double vmin, double vmax, double precision)
{
if (Precision.IsPerpendicular(pl.Plane.Normal, direction, false))
{ // Ebene, die parallel zur Auszugsrichtung liegt. Es entstehen Linien
List <IDualSurfaceCurve> res = new List <IDualSurfaceCurve>();
double[] cpar = basisCurve.GetPlaneIntersection(pl.Plane);
for (int i = 0; i < cpar.Length; i++)
{
// von 0..1 auf startParameter..endParameter umrechnen
double pos = curveStartParameter + cpar[i] * (curveEndParameter - curveStartParameter);
if (pos >= umin && pos <= umax)
{
ICurve c3d = FixedU(pos, vmin, vmax);
Line2D l2d = new Line2D(new GeoPoint2D(pos, vmin), new GeoPoint2D(pos, vmax));
DualSurfaceCurve dsc = new DualSurfaceCurve(c3d, this, l2d, pl, c3d.GetProjectedCurve(pl.Plane));
res.Add(dsc);
}
}
return(res.ToArray());
//return new IDualSurfaceCurve[] { };
//return base.GetPlaneIntersection(pl, umin, umax, vmin, vmax, precision); // stürzt ab mit 50050020_012_1_FMZ.stp
}
else if (Precision.SameDirection(direction, pl.Plane.Normal, false))
{
if (basisCurve.GetPlanarState() == PlanarState.Planar && Precision.SameDirection(direction, basisCurve.GetPlane().Normal, false))
{
Plane cp = basisCurve.GetPlane();
if (!Precision.SameNotOppositeDirection(cp.Normal, direction))
{
cp = new Plane(cp.Location, cp.DirectionY, cp.DirectionX);
}
double v = cp.Distance(pl.Plane.Location) / direction.Length;
Line2D l2d = new Line2D(new GeoPoint2D(curveStartParameter, v), new GeoPoint2D(curveEndParameter, v));
DualSurfaceCurve dsc = new DualSurfaceCurve(basisCurve.CloneModified(ModOp.Translate(v * direction)), this, l2d, pl, basisCurve.GetProjectedCurve(pl.Plane));
return(new IDualSurfaceCurve[] { dsc });
}
}
// keine Lösung gefunden
double[] upos = basisCurve.GetSavePositions();
InterpolatedDualSurfaceCurve.SurfacePoint[] sp = new InterpolatedDualSurfaceCurve.SurfacePoint[upos.Length];
for (int i = 0; i < upos.Length; ++i)
{
GeoPoint p0 = basisCurve.PointAt(upos[i]);
double pos = curveStartParameter + upos[i] * (curveEndParameter - curveStartParameter);
GeoPoint2D[] ips = pl.GetLineIntersection(p0, direction);
if (ips.Length == 1)
{
GeoPoint p3d = pl.PointAt(ips[0]);
double v = Geometry.LinePar(p0, direction, p3d);
sp[i] = new InterpolatedDualSurfaceCurve.SurfacePoint(p3d, new GeoPoint2D(pos, v), ips[0]);
}
}
InterpolatedDualSurfaceCurve idsc = new InterpolatedDualSurfaceCurve(this, pl, sp, true);
return(new IDualSurfaceCurve[] { idsc.ToDualSurfaceCurve() });
//return base.GetPlaneIntersection(pl, umin, umax, vmin, vmax, precision);
}
public override IDualSurfaceCurve[] GetPlaneIntersection(PlaneSurface pl, double umin, double umax, double vmin, double vmax, double precision)
{
if (Precision.IsPerpendicular(pl.Normal, zAxis, false))
{
// two lines along the cylinder axis
Plane lower = new Plane(location, zAxis);
GeoPoint2D sp2d = lower.Project(pl.Location);
GeoVector2D dir2d = lower.Project(pl.Normal).ToLeft();
GeoPoint2D[] ips = Geometry.IntersectLC(sp2d, dir2d, GeoPoint2D.Origin, xAxis.Length);
IDualSurfaceCurve[] res = new IDualSurfaceCurve[ips.Length];
for (int i = 0; i < ips.Length; i++)
{
GeoPoint p = lower.ToGlobal(ips[i]);
Line l3d = Line.TwoPoints(p, p + zAxis);
res[i] = new DualSurfaceCurve(l3d, this, new Line2D(this.PositionOf(l3d.StartPoint), this.PositionOf(l3d.EndPoint)), pl, new Line2D(pl.PositionOf(l3d.StartPoint), pl.PositionOf(l3d.EndPoint)));
}
return(res);
}
else
{
// an ellipse
GeoPoint2D[] cnts = pl.GetLineIntersection(location, zAxis);
if (cnts.Length == 1)
{ // there must be exactly one intersection
GeoPoint cnt = pl.PointAt(cnts[0]);
GeoVector minorAxis = pl.Normal ^ zAxis;
minorAxis.Length = xAxis.Length;
GeoVector majorAxis = minorAxis ^ pl.Normal;
Polynom impl = GetImplicitPolynomial();
Polynom toSolve = impl.Substitute(new Polynom(majorAxis.x, "u", cnt.x, ""), new Polynom(majorAxis.y, "u", cnt.y, ""), new Polynom(majorAxis.z, "u", cnt.z, ""));
double[] roots = toSolve.Roots();
// there must be two roots
majorAxis = roots[0] * majorAxis;
Ellipse elli = Ellipse.Construct();
elli.SetEllipseCenterAxis(cnt, majorAxis, minorAxis);
GeoPoint2D[] fpnts = new GeoPoint2D[5];
for (int i = 0; i < 5; i++)
{
fpnts[i] = PositionOf(elli.PointAt(i / 6.0));
}
Ellipse2D e2d = Ellipse2D.FromFivePoints(fpnts); // there should be a better way to calculate the 2d ellipse, but the following is wrong:
// Ellipse2D e2d = new Ellipse2D(GeoPoint2D.Origin, PositionOf(cnt + majorAxis).ToVector(), PositionOf(cnt + minorAxis).ToVector());
// and principal axis doesn't yield the correct result either
// Geometry.PrincipalAxis(PositionOf(cnt + majorAxis).ToVector(), PositionOf(cnt + minorAxis).ToVector(), out GeoVector2D maj, out GeoVector2D min);
return(new IDualSurfaceCurve[] { new DualSurfaceCurve(elli, this, e2d, pl, pl.GetProjectedCurve(elli, 0.0)) });
}
}
return(new IDualSurfaceCurve[0]);
}
/// <summary>
/// Overrides <see cref="CADability.GeoObject.ISurfaceImpl.GetPlaneIntersection (PlaneSurface, double, double, double, double, double)"/>
/// </summary>
/// <param name="pl"></param>
/// <param name="umin"></param>
/// <param name="umax"></param>
/// <param name="vmin"></param>
/// <param name="vmax"></param>
/// <param name="precision"></param>
/// <returns></returns>
public override IDualSurfaceCurve[] GetPlaneIntersection(PlaneSurface pl, double umin, double umax, double vmin, double vmax, double precision)
{
IDualSurfaceCurve[] idsc = base.GetPlaneIntersection(pl, umin, umax, vmin, vmax, precision);
if (idsc == null || idsc.Length == 0)
{
return(idsc);
}
IDualSurfaceCurve dsc = idsc[0];
if (dsc != null)
{
dsc = new DualSurfaceCurve(dsc.Curve3D, this, new ProjectedCurve(dsc.Curve3D, this, true, new BoundingRect(umin, vmin, umax, vmax)), dsc.Surface2, dsc.Curve2D2);
}
return(new IDualSurfaceCurve[] { dsc });
}
