TDF_Label Problem

Thanks!! your kind. I can success to make Edge object.

this is tip about how to use TDF_Reference.

when you use already existed object information, you use upper object.

TDF_Reference is descendant class of TDF_Attribute.

Some example is below code.

Assume there is a Vertex in your view. you want to use that like below.

Edge1
#-------------------------------+
Vertex1 Vertex2

# : Existed Object
+ : New object.

and Assume Vertex entry is 0:1 and Vertex have TDataStd_Real Attribute to store the position x,y,z. also Vertex1 is it's lable name. Each Entry is 0:1:1, 0:1:2, 0:1:3. and then, I make Edge Label have Reference information about Vertex1, new information about Vertex2.

TDF_Label EdgeLabel = TDF_TagSource(anyLabel);
TDF_Label VertexLabel1 = EdgeLabel.FindChild(1);
TDF_Label VertexLabel2 = EdgeLabel.FindChild(2);

and then You use the TDF_Reference to link between VertexLabel1 and Vertex1.

TDF_Reference::Set(VertexLabel1, Vertex1) // If you want to reference the Attribute about Vertex1
TDF_Reference::Set(VertexLabel1.FindChild(1), Vertex1.FindChild(1)) // reference the x
TDF_Reference::Set(VertexLabel1.FindChild(2), Vertex1.FindChild(2)) // reference the y
TDF_Reference::Set(VertexLabel1.FindChild(3), Vertex1.FindChild(3)) // reference the z

finally, In virtual method Excute() your descendant class of TFunction_Driver, You get Reference Value about Vertex1.

Handle(TDataStd_Real) TSR;
Handle(TDF_Reference) Ref;
Standard_Real x1,y1,z1,x2,y2,z2;

// Vertex 1;
if(Label().FindChild(1,Standard_False).FindChild(1,Standard_False).FindAttribute(TDataStd_Real::GetID(), TSR ))
{
x1=TSR->Get();
}
else if(Label().FindChild(1,Standard_False).FindChild(1,Standard_False).FindAttribute(TDF_Reference::GetID(), Ref))
{
if(Ref->Get().FindAttribute(TDataStd_Real::GetID(), TSR))
{
x1=TSR->Get();
}
}
else
return 1;

same procedure
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this code is helpful your application.
YeonCheol