| public static SubXYZ ( Autodesk p1, Autodesk p2 ) : Autodesk.Revit.DB.XYZ | ||
| p1 | Autodesk | The first point(vector) |
| p2 | Autodesk | The second point(vector) |
| return | Autodesk.Revit.DB.XYZ | |
/// <summary>
/// Get two vectors, which indicate some edge direction which contain given point,
/// set the given point as the start point, the other end point of the edge as end
/// </summary>
/// <param name="point">A point of the swept profile</param>
/// <returns>Two vectors indicate edge direction</returns>
protected List <Autodesk.Revit.DB.XYZ> GetRelatedVectors(Autodesk.Revit.DB.XYZ point)
{
// Initialize the return vector list.
List <Autodesk.Revit.DB.XYZ> vectors = new List <Autodesk.Revit.DB.XYZ>();
// Get all the edges which contain this point.
// And get the vector from this point to another point
foreach (Line line in m_edges)
{
if (GeomUtil.IsEqual(point, line.GetEndPoint(0)))
{
Autodesk.Revit.DB.XYZ vector = GeomUtil.SubXYZ(line.GetEndPoint(1), line.GetEndPoint(0));
vectors.Add(vector);
}
if (GeomUtil.IsEqual(point, line.GetEndPoint(1)))
{
Autodesk.Revit.DB.XYZ vector = GeomUtil.SubXYZ(line.GetEndPoint(0), line.GetEndPoint(1));
vectors.Add(vector);
}
}
// only two vectors(directions) should be found
if (2 != vectors.Count)
{
throw new Exception("A point on swept profile should have only two directions.");
}
return(vectors);
}
/// <summary>
/// Get the swept profile(face) of the host object(family instance)
/// </summary>
/// <param name="solid">The solid reference</param>
/// <returns>The swept profile</returns>
private Face GetSweptProfileFace(Solid solid)
{
// Get a point on the swept profile from all points in solid
Autodesk.Revit.DB.XYZ refPoint = new Autodesk.Revit.DB.XYZ(); // the point on swept profile
foreach (Edge edge in solid.Edges)
{
List <XYZ> points = edge.Tessellate() as List <XYZ>; //get end points of the edge
if (2 != points.Count) // make sure all edges are lines
{
throw new Exception("Each edge should be a line.");
}
// get two points of the edge. All points in solid should be transformed first
Autodesk.Revit.DB.XYZ first = Transform(points[0]); // start point of edge
Autodesk.Revit.DB.XYZ second = Transform(points[1]); // end point of edge
// some edges should be paralleled with the driving line,
// and the start point of that edge should be the wanted point
Autodesk.Revit.DB.XYZ edgeVector = GeomUtil.SubXYZ(second, first);
if (GeomUtil.IsSameDirection(edgeVector, m_drivingVector))
{
refPoint = first;
break;
}
if (GeomUtil.IsOppositeDirection(edgeVector, m_drivingVector))
{
refPoint = second;
break;
}
}
// Find swept profile(face)
Face sweptFace = null; // define the swept face
foreach (Face face in solid.Faces)
{
if (null != sweptFace)
{
break;
}
// the swept face should be perpendicular with the driving line
if (!GeomUtil.IsVertical(face, m_drivingLine, m_transform, null))
{
continue;
}
// use the point to get the swept face
foreach (Autodesk.Revit.DB.XYZ point in face.Triangulate().Vertices)
{
Autodesk.Revit.DB.XYZ pnt = Transform(point); // all points in solid should be transformed
if (GeomUtil.IsEqual(refPoint, pnt))
{
sweptFace = face;
break;
}
}
}
return(sweptFace);
}
/// <summary>
/// constructor
/// </summary>
/// <param name="element">The host object, must be family instance</param>
public GeometrySupport(FamilyInstance element)
{
// get the geometry element of the selected element
Autodesk.Revit.DB.GeometryElement geoElement = element.get_Geometry(new Options());
IEnumerator <GeometryObject> Objects = geoElement.GetEnumerator();
//if (null == geoElement || 0 == geoElement.Objects.Size)
if (null == geoElement || !Objects.MoveNext())
{
throw new Exception("Can't get the geometry of selected element.");
}
SweptProfile swProfile = element.GetSweptProfile();
if (swProfile == null || !(swProfile.GetDrivingCurve() is Line))
{
throw new Exception("The selected element driving curve is not a line.");
}
// get the driving path and vector of the beam or column
Line line = swProfile.GetDrivingCurve() as Line;
if (null != line)
{
m_drivingLine = line; // driving path
m_drivingVector = GeomUtil.SubXYZ(line.GetEndPoint(1), line.GetEndPoint(0));
m_drivingLength = m_drivingVector.GetLength();
}
//get the geometry object
//foreach (GeometryObject geoObject in geoElement.Objects)
Objects.Reset();
while (Objects.MoveNext())
{
GeometryObject geoObject = Objects.Current;
//get the geometry instance which contains the geometry information
GeoInstance instance = geoObject as GeoInstance;
if (null != instance)
{
//foreach (GeometryObject o in instance.SymbolGeometry.Objects)
IEnumerator <GeometryObject> Objects1 = instance.SymbolGeometry.GetEnumerator();
while (Objects1.MoveNext())
{
GeometryObject o = Objects1.Current;
// get the solid of beam of column
Solid solid = o as Solid;
// do some checks.
if (null == solid)
{
continue;
}
if (0 == solid.Faces.Size || 0 == solid.Edges.Size)
{
continue;
}
m_solid = solid;
//get the transform value of instance
m_transform = instance.Transform;
// Get the swept profile curves information
if (!GetSweptProfile(solid))
{
throw new Exception("Can't get the swept profile curves.");
}
break;
}
}
}
// do some checks about profile curves information
if (null == m_edges)
{
throw new Exception("Can't get the geometry edge information.");
}
if (4 != m_points.Count)
{
throw new Exception("The sample only works for rectangle beam or column.");
}
}
