/// <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());
if (null == geoElement || 0 == geoElement.Objects.Size)
{
throw new Exception("Can't get the geometry of selected element.");
}
AnalyticalModel aModel = element.GetAnalyticalModel();
if (aModel == null)
{
throw new Exception("The selected FamilyInstance don't have AnalyticalModel.");
}
AnalyticalModelSweptProfile swProfile = aModel.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.get_EndPoint(1), line.get_EndPoint(0));
m_drivingLength = m_drivingVector.GetLength();
}
//get the geometry object
foreach (GeometryObject geoObject in geoElement.Objects)
{
//get the geometry instance which contains the geometry information
GeoInstance instance = geoObject as GeoInstance;
if (null != instance)
{
foreach (GeometryObject o in instance.SymbolGeometry.Objects)
{
// 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.");
}
}