【转帖】how to copy properly a dimension entity
 

how to copy properly a dimension entity?
how to copy properly a dimension entity?
here is a sample code which i run in odamfcappdll (dwgdirect 1.12.1)
code:
oddbentityptr getnewdim()
{
oddbrotateddimensionptr pdim = oddbrotateddimension::createobject();

pdim->setxline1point(odgepoint3d(0,0,0));
pdim->setxline2point(odgepoint3d(10,0,0));
pdim->setdimlinepoint(odgepoint3d(5,5,0));

return pdim;
}
void cdwgview::ontestcommandsdimensionbug()
{
try {
oddbdatabase* pdb = getdocument();

// create a line in the model space
oddbobjectid ident;
{
oddbblocktablerecordptr pblock =
pdb->getmodelspaceid().safeopenobject(oddb::kforwrite);
ident = pblock->appendoddbentity( getnewdim() );
}

// create a copy of that line
oddbobjectid idcopiedent;
{
oddbobjectidarray ids;
ids.push_back(ident);
oddbidmappingptr pmapping = oddbidmapping::createobject();
pdb->deepcloneobjects(ids,pdb->getmodelspaceid(),*pmapping);

oddbidpair idpair(ident);
pmapping->compute(idpair);
idcopiedent = idpair.value();
oda_assert(!idcopiedent.isnull());
}

// translate the copy
{
oddbentityptr pent = idcopiedent.safeopenobject(oddb::kforwrite);
pent->transformby(odgematrix3d::translation(odgevector3d(0,10,0)));
}

getdocument()->updateallviews(null);

} catch(oderror& e) {
theapp.reporterror("error", e);
} //catch

}
it should create 2 dimension at different positions, but rather that, the 2 dimensions are created at the position of the translated dimension only!
if the drawing is opened in acad, it is very strange - select all and the stretch points of the first dimension are drawn but no dimension there.
is there a way to avoid this?
best regards
chudomir
the reason of the problem is that after cloning you get both dimensions referencing the same dimension block.
as a result modifuing any dimension causes recomputing of the same block and it effects appearance of both ones.
probably this should be fixed in deepclone().
as a work around you can set to null dimblockid in the clone and new block will be created.
sergey slezkin