//族实例化,创建族并对其进行旋转
private FamilyInstance CreateFamlyInstance(DG.Point DGpoint, DG.Curve curve, FamilySymbol FamilySymbol, ExternalCommandData commandData)
{
UIDocument uiDoc = commandData.Application.ActiveUIDocument; //取得当前活动文档
XYZ point = DGpoint.ToRevitType(false); //dynamo转Revit
FamilyInstance familyInstance = uiDoc.Document.Create.NewFamilyInstance(point, FamilySymbol, Autodesk.Revit.DB.Structure.StructuralType.NonStructural);
LocationPoint locationPoint = familyInstance.Location as LocationPoint;//自适应族基点
XYZ axisP = new XYZ(point.X, point.Y, point.Z + 100);
Autodesk.Revit.DB.Line axis = Autodesk.Revit.DB.Line.CreateBound(point, axisP);//旋转轴
//计算旋转角度
double ratio = curve.ParameterAtPoint(DGpoint);
DG.Vector vector = curve.TangentAtParameter(ratio);
MessageBox.Show(vector.ToString());
DG.Vector vector1 = DG.Vector.ByCoordinates(vector.X, vector.Y, 0);//三维切向量的平面向量
DG.Vector vectorY = DG.Vector.ByCoordinates(0, 1, 0);
double angle = vector1.AngleWithVector(vectorY) / 180 * Math.PI;
MessageBox.Show(angle.ToString());
//locationPoint.Rotate(axis, angle);//旋转横梁
ElementTransformUtils.RotateElement(uiDoc.Document, familyInstance.Id, axis, -angle);
return(familyInstance);
}