/// <summary> /// Create a CurveByPoints element by three given points /// </summary> public static CurveByPoints MakeCurve( FamilyItemFactory creator, XYZ pa, XYZ pb, XYZ pc) { ReferencePoint rpa = creator.NewReferencePoint(pa); ReferencePoint rpb = creator.NewReferencePoint(pb); ReferencePoint rpc = creator.NewReferencePoint(pc); ReferencePointArray arr = new ReferencePointArray(); arr.Append(rpa); arr.Append(rpb); arr.Append(rpc); return(creator.NewCurveByPoints(arr)); }
/// <summary> /// Create a CurveByPoints element by three given points /// </summary> public static CurveByPoints MakeCurve( FamilyItemFactory creator, XYZ pa, XYZ pb, XYZ pc) { ReferencePoint rpa = creator.NewReferencePoint( pa ); ReferencePoint rpb = creator.NewReferencePoint( pb ); ReferencePoint rpc = creator.NewReferencePoint( pc ); ReferencePointArray arr = new ReferencePointArray(); arr.Append( rpa ); arr.Append( rpb ); arr.Append( rpc ); return creator.NewCurveByPoints( arr ); }
//绘制模型线 private void CreateCurve(XYZ startPoint, XYZ endPoint, XYZ normal1, XYZ normal2) { XYZ StartToEnd = new XYZ((endPoint - startPoint).X, (endPoint - startPoint).Y, 0); XYZ p_normal1 = new XYZ(normal1.X, normal1.Y, 0); XYZ p_normal2 = new XYZ(normal2.X, normal2.Y, 0); p_normal1 = p_normal1 / (Math.Sqrt(p_normal1.X * p_normal1.X + p_normal1.Y * p_normal1.Y)); p_normal2 = p_normal2 / (Math.Sqrt(p_normal2.X * p_normal2.X + p_normal2.Y * p_normal2.Y)); XYZ XoYprj_start = new XYZ(startPoint.X, startPoint.Y, 0); XYZ XoYprj_end = new XYZ(endPoint.X, endPoint.Y, 0); //在起点、终点间插值,并在z=0平面上绘制NurbSpline曲线 double[] doubleArray = { 1, 1, 1, 1, 1, 1 }; IList <XYZ> controlPoints2 = new List <XYZ>(); controlPoints2.Add(XoYprj_start); controlPoints2.Add(XoYprj_start + p_normal1 * mmToFeet(2000)); controlPoints2.Add(XoYprj_start + p_normal1 * mmToFeet(4000)); controlPoints2.Add(XoYprj_end + p_normal2 * mmToFeet(4000)); controlPoints2.Add(XoYprj_end + p_normal2 * mmToFeet(2000)); controlPoints2.Add(XoYprj_end); Curve nbLine = NurbSpline.Create(controlPoints2, doubleArray); //提取曲线上的拟合点,并在z轴方向插值拟合原曲线 IList <XYZ> ptsOnCurve = nbLine.Tessellate(); int ptCount = ptsOnCurve.Count; ReferencePointArray ptArr = new ReferencePointArray(); for (int i = 0; i < ptCount; i++) { XYZ pt = ptsOnCurve[i]; if (i < (ptCount - 1) / 8) { ptArr.Append(m_familyCreator.NewReferencePoint(new XYZ(pt.X, pt.Y, startPoint.Z))); } else if (i > 7 * (ptCount - 1) / 8) { ptArr.Append(m_familyCreator.NewReferencePoint(new XYZ(pt.X, pt.Y, endPoint.Z))); } else { ptArr.Append(m_familyCreator.NewReferencePoint(new XYZ(pt.X, pt.Y, startPoint.Z + (i - (ptCount - 1) / 8) * (endPoint.Z - startPoint.Z) / (0.75 * (ptCount - 1))))); } //ReferencePoint p = m_familyCreator.NewReferencePoint(new XYZ(pt.X, pt.Y, startPoint.Z + i*(endPoint.Z - startPoint.Z)/ (ptCount - 1))); //ptArr.Append(p); } CurveByPoints curve = m_familyCreator.NewCurveByPoints(ptArr); curve.Visible = false; //创建放样平面并加入参照数组中 int step = 8;//取step个点进行拟合 ReferenceArrayArray refArr = new ReferenceArrayArray(); for (int i = 0; i <= step; i++) { int position = i * (ptCount - 1) / step; //取起点截面及第二个截面作为参照平面 if (i == 0) { refArr.Append(CreatePlaneByPoint(ptArr.get_Item(position), ptArr.get_Item((i + 1) * (ptCount - 1) / step), (curve.GeometryCurve as HermiteSpline).Tangents[position], (curve.GeometryCurve as HermiteSpline).Tangents[((i + 1) * (ptCount - 1) / step)])); } //取终点截面及倒数第二个截面作为参照平面 else if (i == step) { refArr.Append(CreatePlaneByPoint(ptArr.get_Item(position), ptArr.get_Item((i - 1) * (ptCount - 1) / step), (curve.GeometryCurve as HermiteSpline).Tangents[position], (curve.GeometryCurve as HermiteSpline).Tangents[((i - 1) * (ptCount - 1) / step)])); } else { refArr.Append(CreatePlaneByPoint(ptArr.get_Item(position), (curve.GeometryCurve as HermiteSpline).Tangents[position])); } } //创建放样实体 m_familyCreator.NewLoftForm(true, refArr); }