C++ MultiGrid::detach_from_vertices方法代码示例

void CopyGridLevel(MultiGrid& srcMG, Grid& destGrid,
				   ISubsetHandler& srcSH, ISubsetHandler& destSH,
				   int lvl, TAPos aPos)
{
	Grid::VertexAttachmentAccessor<TAPos> aaPos(destGrid, aPos);
	Grid::VertexAttachmentAccessor<TAPos> aaSrcPos(srcMG, aPos);
	GridObjectCollection goc = srcMG.get_grid_objects();

	AVertex aNewVrt;
	srcMG.attach_to_vertices(aNewVrt);
	Grid::VertexAttachmentAccessor<AVertex> aaNewVrt(srcMG, aNewVrt);

	for(int si = destSH.num_subsets(); si < srcSH.num_subsets(); ++si)
	{
		destSH.subset_info(si) = srcSH.subset_info(si);
	}

	for(VertexIterator vrtIter = goc.begin<Vertex>(lvl); vrtIter != goc.end<Vertex>(lvl); ++vrtIter)
	{
		Vertex* srcVrt  = *vrtIter;
		Vertex* destVrt = *destGrid.create_by_cloning(srcVrt);

		aaNewVrt[srcVrt] = destVrt;
		aaPos[destVrt] = aaSrcPos[srcVrt];
		destSH.assign_subset(destVrt, srcSH.get_subset_index(srcVrt));
	}

	CopyGridLevelElements<Edge>(srcMG, destGrid, srcSH, destSH, lvl, aNewVrt);
	CopyGridLevelElements<Face>(srcMG, destGrid, srcSH, destSH, lvl, aNewVrt);
	CopyGridLevelElements<Volume>(srcMG, destGrid, srcSH, destSH, lvl, aNewVrt);

	srcMG.detach_from_vertices(aNewVrt);
}

bool SaveGridHierarchyTransformed(MultiGrid& mg, ISubsetHandler& sh,
								  const char* filename, number offset)
{
	PROFILE_FUNC_GROUP("grid");
	APosition aPos;
//	uses auto-attach
	Grid::AttachmentAccessor<Vertex, APosition> aaPos(mg, aPos, true);

//	copy the existing position to aPos. We take care of dimension differences.
//	Note:	if the method was implemented for domains, this could be implemented
//			in a nicer way.
	if(mg.has_vertex_attachment(aPosition))
		ConvertMathVectorAttachmentValues<Vertex>(mg, aPosition, aPos);
	else if(mg.has_vertex_attachment(aPosition2))
		ConvertMathVectorAttachmentValues<Vertex>(mg, aPosition2, aPos);
	else if(mg.has_vertex_attachment(aPosition1))
		ConvertMathVectorAttachmentValues<Vertex>(mg, aPosition1, aPos);

//	iterate through all vertices and apply an offset depending on their level.
	for(size_t lvl = 0; lvl < mg.num_levels(); ++lvl){
		for(VertexIterator iter = mg.begin<Vertex>(lvl);
			iter != mg.end<Vertex>(lvl); ++iter)
		{
			aaPos[*iter].z() += (number)lvl * offset;
		}
	}

//	finally save the grid
	bool writeSuccess = SaveGridToFile(mg, sh, filename, aPos);

//	clean up
	mg.detach_from_vertices(aPos);

	return writeSuccess;
}

bool SaveSurfaceViewTransformed(MultiGrid& mg, const SurfaceView& sv,
								const char* filename, number offset)
{
	PROFILE_FUNC_GROUP("grid");

	APosition aPos;
//	uses auto-attach
	Grid::AttachmentAccessor<Vertex, APosition> aaPos(mg, aPos, true);

//	copy the existing position to aPos. We take care of dimension differences.
//	Note:	if the method was implemented for domains, this could be implemented
//			in a nicer way.
	if(mg.has_vertex_attachment(aPosition))
		ConvertMathVectorAttachmentValues<Vertex>(mg, aPosition, aPos);
	else if(mg.has_vertex_attachment(aPosition2))
		ConvertMathVectorAttachmentValues<Vertex>(mg, aPosition2, aPos);
	else if(mg.has_vertex_attachment(aPosition1))
		ConvertMathVectorAttachmentValues<Vertex>(mg, aPosition1, aPos);

//	iterate through all vertices and apply an offset depending on their level.
	for(size_t lvl = 0; lvl < mg.num_levels(); ++lvl){
		for(VertexIterator iter = mg.begin<Vertex>(lvl);
			iter != mg.end<Vertex>(lvl); ++iter)
		{
			aaPos[*iter].z() += (number)lvl * offset;
		}
	}

//	create a subset handler which holds different subsets for the different interface types
	SubsetHandler sh(mg);

	AssignSubsetsBySurfaceViewState<Vertex>(sh, sv, mg);
	AssignSubsetsBySurfaceViewState<Edge>(sh, sv, mg);
	AssignSubsetsBySurfaceViewState<Face>(sh, sv, mg);
	AssignSubsetsBySurfaceViewState<Volume>(sh, sv, mg);

	AssignSubsetColors(sh);
	EraseEmptySubsets(sh);

//	finally save the grid
	bool writeSuccess = SaveGridToFile(mg, sh, filename, aPos);

//	clean up
	mg.detach_from_vertices(aPos);

	return writeSuccess;
}