public static Ellipse2D FromFivePoints(GeoPoint2D[] p, bool isFull) { Ellipse2D res = FromFivePoints(p); if (res != null) { double mindist = double.MaxValue; double p0 = res.PositionOf(p[0]); for (int i = 1; i < 5; i++) { double p1 = res.PositionOf(p[i]); if (Math.Abs(p1 - p0) < Math.Abs(mindist)) { mindist = p1 - p0; } p0 = p1; } if (mindist < 0) { res.Reverse(); } if (!isFull) { double sp = res.PositionOf(p[0]); double ep = res.PositionOf(p[4]); double mp = res.PositionOf(p[2]); if (sp < ep) { if (sp < mp && mp < ep) { res = res.Trim(sp, ep) as Ellipse2D; } else { res = res.Trim(ep, sp) as Ellipse2D; } } else { // to be tested! if (sp < mp && mp < ep) { res = res.Trim(ep, sp) as Ellipse2D; } else { res = res.Trim(sp, ep) as Ellipse2D; } } } } return(res); }
private static void RefineIntersectionPoint(Ellipse2D e1, Ellipse2D e2, ref GeoPoint2DWithParameter ip) { // hier mir Param arbeiten, da es sich auch um einen Ellipsenbogen handeln kann double par1 = e1.ParamOf(ip.p); double par2 = e2.ParamOf(ip.p); GeoPoint2D p1 = e1.PointAtParam(par1); GeoPoint2D p2 = e2.PointAtParam(par2); int counter = 0; while (!Precision.IsEqual(p1, p2)) { GeoVector2D d1 = e1.DirectionAtParam(par1); GeoVector2D d2 = e2.DirectionAtParam(par2); GeoPoint2D p; if (Geometry.IntersectLL(p1, d1, p2, d2, out p)) { par1 = e1.ParamOf(p); par2 = e2.ParamOf(p); p1 = e1.PointAtParam(par1); p2 = e2.PointAtParam(par2); ip.p = p; } else { break; } ++counter; if (counter > 100) { break; } } ip.par1 = e1.PositionOf(ip.p); // richtige Werte auch für Arc ip.par2 = e2.PositionOf(ip.p); }
/// <summary> /// Overrides <see cref="CADability.Curve2D.GeneralCurve2D.Intersect (ICurve2D)"/> /// </summary> /// <param name="IntersectWith"></param> /// <returns></returns> public override GeoPoint2DWithParameter[] Intersect(ICurve2D IntersectWith) { // gesucht sind alle Schnittpunkte, also auch in der Verlängerung! Line2D l2d = IntersectWith as Line2D; if (l2d != null) { GeoPoint2D ip; if (Geometry.IntersectLL(startPoint, endPoint, l2d.StartPoint, l2d.EndPoint, out ip)) { double pos1 = this.PositionOf(ip); double pos2 = l2d.PositionOf(ip); GeoPoint2DWithParameter pwp = new GeoPoint2DWithParameter(); pwp.p = ip; pwp.par1 = pos1; pwp.par2 = pos2; return(new GeoPoint2DWithParameter[] { pwp }); } else { return(new GeoPoint2DWithParameter[0]); } } Circle2D c2d = IntersectWith as Circle2D; if (c2d != null) { GeoPoint2D[] isp = Geometry.IntersectLC(startPoint, endPoint, c2d.Center, c2d.Radius); GeoPoint2DWithParameter[] res = new GeoPoint2DWithParameter[isp.Length]; for (int i = 0; i < isp.Length; ++i) { res[i].p = isp[i]; res[i].par1 = this.PositionOf(isp[i]); res[i].par2 = c2d.PositionOf(isp[i]); } return(res); } Ellipse2D e2d = IntersectWith as Ellipse2D; if (e2d != null) { GeoPoint2D[] isp = Geometry.IntersectEL(e2d.center, e2d.majorAxis.Length, e2d.minorAxis.Length, e2d.majorAxis.Angle, startPoint, endPoint); GeoPoint2DWithParameter[] res = new GeoPoint2DWithParameter[isp.Length]; for (int i = 0; i < isp.Length; ++i) { res[i].p = isp[i]; res[i].par1 = this.PositionOf(isp[i]); res[i].par2 = e2d.PositionOf(isp[i]); } return(res); } Polyline2D p2d = IntersectWith as Polyline2D; if (p2d != null) { GeoPoint2DWithParameter[] res = p2d.Intersect(this); // sorum geht es for (int i = 0; i < res.Length; ++i) { double t = res[i].par1; res[i].par1 = res[i].par2; res[i].par2 = t; } return(res); } Path2D pa2d = IntersectWith as Path2D; if (pa2d != null) { GeoPoint2DWithParameter[] res = pa2d.Intersect(this); // sorum geht es for (int i = 0; i < res.Length; ++i) { double t = res[i].par1; res[i].par1 = res[i].par2; res[i].par2 = t; } return(res); } BSpline2D b2d = IntersectWith as BSpline2D; if (b2d != null) { GeoPoint2DWithParameter[] res = b2d.Intersect(this); // sorum geht es for (int i = 0; i < res.Length; ++i) { double t = res[i].par1; res[i].par1 = res[i].par2; res[i].par2 = t; } return(res); } return(base.Intersect(IntersectWith)); }