revit中绘制任意直线

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revit二次开发的过程中常用的方法。

public static void NewLine(this Document doc, XYZ pStart, XYZ pEnd)        {            if (pStart.IsAlmostEqualTo(pEnd))            {                return;            }            using (Transaction tr = new Transaction(doc, Guid.NewGuid().ToString()))            {                try                {                    tr.Start();                    Line line = Line.CreateBound(pStart, pEnd);                    double angle = line.Direction.AngleTo(XYZ.BasisX);                    XYZ norm = line.Direction.CrossProduct(XYZ.BasisX).Normalize();                    if (angle - 0.0 < 1e-6)                    {                        angle = line.Direction.AngleTo(XYZ.BasisY);                        norm = line.Direction.CrossProduct(XYZ.BasisY).Normalize();                    }                    if (angle - 0.0 < 1e-6)                    {                        angle = line.Direction.AngleTo(XYZ.BasisZ);                        norm = line.Direction.CrossProduct(XYZ.BasisZ).Normalize();                    }                    Plane plane = doc.Application.Create.NewPlane(norm, line.Origin);                    SketchPlane skplane = SketchPlane.Create(doc, plane);                    ModelCurve newLine = doc.Create.NewModelCurve(line, skplane);                    tr.Commit();                }                catch (Exception ex)                {                    tr.RollBack();                }            }        }

它可以绘制任意直线，绘制直线的时候，当直线与XY平面或XZ平面或YZ平面共线也可以绘制。它是开发的重

要辅助工具。

关键还是在于这段代码，处理了多种情况。

   XYZ norm = line.Direction.CrossProduct(XYZ.BasisX).Normalize();   if (angle - 0.0 < 1e-6)   {           angle = line.Direction.AngleTo(XYZ.BasisY);           norm = line.Direction.CrossProduct(XYZ.BasisY).Normalize();   }   if (angle - 0.0 < 1e-6)   {           angle = line.Direction.AngleTo(XYZ.BasisZ);           norm = line.Direction.CrossProduct(XYZ.BasisZ).Normalize();   }

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