private MCvSubdiv2DPoint cvSubdiv2DEdge(int offset)
{
Int64 edgeInt64 = edge.ToInt64();
IntPtr ptr = (IntPtr)(edgeInt64 & -4); //the last 2 bits are set to zero
MCvQuadEdge2D qe = (MCvQuadEdge2D)Marshal.PtrToStructure(ptr, typeof(MCvQuadEdge2D));
IntPtr pointPtr = qe.pt[(edgeInt64 + offset) & 3]; //use only the last 2 bit as index
if (pointPtr == IntPtr.Zero)
{
MCvSubdiv2DPoint pt = new MCvSubdiv2DPoint();
pt.flags = -1;
return pt; // return an invalid point
}
else
{
return (MCvSubdiv2DPoint)Marshal.PtrToStructure(pointPtr, typeof(MCvSubdiv2DPoint));
}
}
/// <summary>
/// similar to cvSubdiv2DEdgeDst
/// </summary>
/// <returns></returns>
public MCvSubdiv2DPoint cvSubdiv2DEdgeDst()
{
Int64 edgeInt64 = edge.ToInt64();
IntPtr ptr = (IntPtr)(edgeInt64 & -4);
MCvQuadEdge2D qe = (MCvQuadEdge2D)Marshal.PtrToStructure(ptr, typeof(MCvQuadEdge2D));
IntPtr pointPtr = qe.pt[(edgeInt64 + 2) & 3];
if (pointPtr == IntPtr.Zero)
{
MCvSubdiv2DPoint pt = new MCvSubdiv2DPoint();
pt.flags = -1;
return pt; // return an invalid point
}
else
{
return (MCvSubdiv2DPoint)Marshal.PtrToStructure(pointPtr, typeof(MCvSubdiv2DPoint));
}
}
/// <summary>
/// similar to cvSubdiv2DEdgeDst
/// </summary>
/// <returns></returns>
public MCvSubdiv2DPoint cvSubdiv2DEdgeDst()
{
Int64 edgeInt64 = edge.ToInt64();
IntPtr ptr = (IntPtr)(edgeInt64 & -4);
MCvQuadEdge2D qe = (MCvQuadEdge2D)Marshal.PtrToStructure(ptr, typeof(MCvQuadEdge2D));
IntPtr pointPtr = qe.pt[(edgeInt64 + 2) & 3];
if (pointPtr == IntPtr.Zero)
{
MCvSubdiv2DPoint pt = new MCvSubdiv2DPoint();
pt.flags = -1;
return(pt); // return an invalid point
}
else
{
return((MCvSubdiv2DPoint)Marshal.PtrToStructure(pointPtr, typeof(MCvSubdiv2DPoint)));
}
}
/// <summary>
/// similar to cvSubdiv2DEdgeOrg
/// </summary>
/// <returns></returns>
public MCvSubdiv2DPoint cvSubdiv2DEdgeOrg()
{
Int64 edgeInt64 = edge.ToInt64();
IntPtr ptr = (IntPtr)(edgeInt64 & -4); //the last 2 bits are set to zero
MCvQuadEdge2D qe = (MCvQuadEdge2D)Marshal.PtrToStructure(ptr, typeof(MCvQuadEdge2D));
IntPtr pointPtr = qe.pt[edgeInt64 & 3]; //use only the last 2 bit as index
if (pointPtr == IntPtr.Zero)
{
MCvSubdiv2DPoint pt = new MCvSubdiv2DPoint();
pt.flags = -1;
return(pt); // return an invalid point
}
else
{
return((MCvSubdiv2DPoint)Marshal.PtrToStructure(pointPtr, typeof(MCvSubdiv2DPoint)));
}
}