public Result Execute(
ExternalCommandData commandData,
ref string message,
ElementSet elements)
{
UIApplication app = commandData.Application;
Document doc = app.ActiveUIDocument.Document;
if (!doc.IsFamilyDocument ||
!doc.OwnerFamily.FamilyCategory.Name.Equals("Mass"))
{
message = "Please run this comand in a conceptual massing family document.";
return(Result.Failed);
}
using (Transaction tx = new Transaction(doc))
{
tx.Start("Create Loft Form");
FamilyItemFactory creator = doc.FamilyCreate;
// Create profiles array
ReferenceArrayArray ref_ar_ar = new ReferenceArrayArray();
// Create first profile
ReferenceArray ref_ar = new ReferenceArray();
int y = 100;
int x = 50;
XYZ pa = new XYZ(-x, y, 0);
XYZ pb = new XYZ(x, y, 0);
XYZ pc = new XYZ(0, y + 10, 10);
CurveByPoints curve = FormUtils.MakeCurve(creator, pa, pb, pc);
ref_ar.Append(curve.GeometryCurve.Reference);
ref_ar_ar.Append(ref_ar);
// Create second profile
ref_ar = new ReferenceArray();
y = 40;
pa = new XYZ(-x, y, 5);
pb = new XYZ(x, y, 5);
pc = new XYZ(0, y, 25);
curve = FormUtils.MakeCurve(creator, pa, pb, pc);
ref_ar.Append(curve.GeometryCurve.Reference);
ref_ar_ar.Append(ref_ar);
// Create third profile
ref_ar = new ReferenceArray();
y = -20;
pa = new XYZ(-x, y, 0);
pb = new XYZ(x, y, 0);
pc = new XYZ(0, y, 15);
curve = FormUtils.MakeCurve(creator, pa, pb, pc);
ref_ar.Append(curve.GeometryCurve.Reference);
ref_ar_ar.Append(ref_ar);
// Create fourth profile
ref_ar = new ReferenceArray();
y = -60;
pa = new XYZ(-x, y, 0);
pb = new XYZ(x, y, 0);
pc = new XYZ(0, y + 10, 20);
curve = FormUtils.MakeCurve(creator, pa, pb, pc);
ref_ar.Append(curve.GeometryCurve.Reference);
ref_ar_ar.Append(ref_ar);
Form form = creator.NewLoftForm(true, ref_ar_ar);
tx.Commit();
}
return(Result.Succeeded);
}
//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);
}