Switching to a single viewport configuration

By Balaji Ramamoorthy

If there are multiple model-space viewports and to switch to a single model-space viewport configuration, you could use the -VPORTS command and specify the SI option.

For example :

acedCommand(RTSTR, L".-VPORTS", RTSTR, L"SI", RTNONE);

The other way to do this is to erase the viewport table records. When there are multiple model space viewports, you will find the same number of viewport table records in the viewport table. They all have the same name. To switch to a single viewport, all the viewports except one may be erased and the last remaining viewport can be set to cover the whole area.

Here is a sample code :

Acad::ErrorStatus es = acedVports2VportTableRecords();
AcDbDatabase* pDb 
            = acdbHostApplicationServices()->workingDatabase();
 
AcDbViewportTable* pVportTable = NULL;
es = pDb->getViewportTable(pVportTable, AcDb::kForRead);
if(es == Acad::eOk)
{
    int vpCnt = 0;
    AcDbViewportTableIterator *pIter = NULL;
    es = pVportTable->newIterator(pIter);
    if(es == Acad::eOk)
    {
        for (;!pIter->done();pIter->step())
        {
            AcDbViewportTableRecord *pVTR = NULL;
            es = pIter->getRecord(pVTR, AcDb::kForRead);
            if(es == Acad::eOk)
            {
                const TCHAR* vtrname;
                if(pVTR->getName(vtrname) == Acad::eOk)
                {
                    if (_tcscmp(vtrname, ACRX_T("*Active"))==0)
                    {
                        vpCnt++;
                    }
                }
                pVTR->close();
            }
        }
        delete pIter;
    }
 
    for(int x = 0; x < vpCnt-1; x++)
    {
        AcDbViewportTableRecord *pVTR = NULL;
        es = pVportTable->getAt(
                                    ACRX_T("*Active"), 
                                    pVTR, 
                                    AcDb::kForWrite
                                );
        if(es == Acad::eOk)
        {
            pVTR->erase(true);
            pVTR->close();
        }
    }
 
    // Set the last viewport to cover the full area
    AcDbViewportTableRecord *pVTR = NULL;
    es = pVportTable->getAt(
                                ACRX_T("*Active"), 
                                pVTR, 
                                AcDb::kForWrite
                            );
    if(es == Acad::eOk)
    {
        AcGePoint2d ll, ur;
        ll.set(0,0);
        ur.set(1,1);
        pVTR->setCenterPoint(AcGePoint2d(0, 0));
        pVTR->setHeight(100);
        pVTR->setWidth(100);
        pVTR->setViewDirection(AcDb::kTopView);
        pVTR->setLowerLeftCorner(ll);
        pVTR->setUpperRightCorner(ur);
        pVTR->close();
    }
    pVportTable->close();
}
es = acedVportTableRecords2Vports();