/// <summary>
/// Calculates the area of an object
/// </summary>
public static double GetArea(IRhinoObject obj, double tol)
{
if (null != obj)
{
IOnCurve crv = OnCurve.ConstCast(obj.Geometry());
if (null != crv)
{
return(GetCurveArea(crv, tol));
}
IOnSurface srf = OnSurface.ConstCast(obj.Geometry());
if (null != srf)
{
return(GetSurfaceArea(srf));
}
IOnBrep brep = OnBrep.ConstCast(obj.Geometry());
if (null != brep)
{
return(GetBrepArea(brep));
}
IOnMesh mesh = OnMesh.ConstCast(obj.Geometry());
if (null != mesh)
{
return(GetMeshArea(mesh));
}
}
return(0.0);
}
/// <summary>
/// Calculates the length of an object
/// </summary>
public static double GetLength(IRhinoObject obj)
{
double length = 0.0;
if (null != obj)
{
IOnCurve crv = OnCurve.ConstCast(obj.Geometry());
if (null != crv)
{
crv.GetLength(ref length);
}
}
return(length);
}
public override bool CustomGeometryFilter(IRhinoObject obj, IOnGeometry geo, OnCOMPONENT_INDEX ci)
{
if (geo != null)
{
IOnCurve crv = OnCurve.ConstCast(geo);
if (crv != null)
{
if (crv.IsClosed() && crv.IsPlanar())
{
return(true);
}
else
{
return(false);
}
}
IOnBrep brep = OnBrep.ConstCast(geo);
if (brep != null)
{
if (brep.m_F.Count() == 1)
{
return(true);
}
else
{
return(false);
}
}
IOnSurface srf = OnSurface.ConstCast(geo);
if (srf != null)
{
return(true);
}
IOnMesh mesh = OnMesh.ConstCast(geo);
if (mesh != null)
{
return(true);
}
}
return(false);
}
/// <summary>
/// MakeTwistedCubeTrimmingLoop
/// </summary>
static int MakeTwistedCubeTrimmingLoop(
ref OnBrep brep, // returns index of loop
ref OnBrepFace face, // face loop is on
int vSWi, int vSEi, int vNEi, int vNWi, // Indices of corner vertices listed in SW, SE, NW, NE order
int eSi, // index of edge on south side of surface
int eS_dir, // orientation of edge with respect to surface trim
int eEi, // index of edge on south side of surface
int eE_dir, // orientation of edge with respect to surface trim
int eNi, // index of edge on south side of surface
int eN_dir, // orientation of edge with respect to surface trim
int eWi, // index of edge on south side of surface
int eW_dir // orientation of edge with respect to surface trim
)
{
IOnSurface srf = brep.m_S[face.m_si];
OnBrepLoop loop = brep.NewLoop(IOnBrepLoop.TYPE.outer, ref face);
// Create trimming curves running counter clockwise around the surface's domain.
// Start at the south side
int c2i = 0, ei = 0;
bool bRev3d = false;
IOnSurface.ISO iso = IOnSurface.ISO.not_iso;
for (int side = 0; side < 4; side++)
{
// side: 0=south, 1=east, 2=north, 3=west
OnCurve c2 = TwistedCubeTrimmingCurve(srf, side);
c2i = brep.m_C2.Count();
brep.m_C2.Append(c2);
switch (side)
{
case 0: // south
ei = eSi;
bRev3d = (eS_dir == -1);
iso = IOnSurface.ISO.S_iso;
break;
case 1: // east
ei = eEi;
bRev3d = (eE_dir == -1);
iso = IOnSurface.ISO.E_iso;
break;
case 2: // north
ei = eNi;
bRev3d = (eN_dir == -1);
iso = IOnSurface.ISO.N_iso;
break;
case 3: // west
ei = eWi;
bRev3d = (eW_dir == -1);
iso = IOnSurface.ISO.W_iso;
break;
}
OnBrepEdge edge = brep.m_E[ei];
OnBrepTrim trim = brep.NewTrim(ref edge, bRev3d, ref loop, c2i);
trim.m_iso = iso;
trim.m_type = IOnBrepTrim.TYPE.mated; // This b-rep is closed, so all trims have mates.
trim.set_m_tolerance(0, 0.0); // This simple example is exact - for models with
trim.set_m_tolerance(1, 0.0); // non-exact data, set tolerance as explained in
// definition of OnBrepTrim.
}
return(loop.m_loop_index);
}