How to show my own GD&T information

Since I have an ap242 step file with GD&T data,I load it in my document and use DimTolTool to get all GDT presentations,then with method "GetGDTPresentations" I will get a map with all GDT TopoDS_Shape,and I can show them in my visualize window.Actually the the GD&T information is define by other software,shown below attachments.
While, if I define my own GD&T information use DimTolTool->AddDimension method,and fill in the XCAFDimTolObjects_DimensionObject to make the dimension defined,my problem is how to compute the presentation of my own GD&T information since I want to show them in the window.

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