Changing Display Resolution Settings Through API

By Madhukar Moogala

We can set all the four settings mentioned under Display Resolution box in Options.

Before setting them through API, we will understand what each variable does.

VIEWRES: Arc and circle smoothness, this sets the resolution for objects in the viewport.

SPLINESEGS: Segments in a polyline curve, this sets number of line segments to be generated for each spline-fit polyline generated by the spline objects of the PEDIT command.

FACETRES: Rendered object smoothness, adjusts the smoothness of shaded and rendered objects  and objects with hidden lines removed.

ISOLINES: Contour lines per surface, specifies the number of contour lines displayed on the curved surface of 3D solids.

void changeDispRes()   {   AcDbDatabase *pDb = acdbHostApplicationServices()->workingDatabase();   acutPrintf(_T("n current SPLINESEGS value %d"),pDb->splinesegs());   acutPrintf(_T("n current FACETRES value %d"),pDb->facetres());   acutPrintf(_T("n current ISOLINES value %d"),pDb->isolines());   pDb->setSplinesegs(8);pDb->setFacetres(0.75);pDb->setIsolines(6);   AcDbObjectId curVportId = AcDbObjectId::kNull;   curVportId = acedActiveViewportId();   AcDbObjectPointer curVTR (curVportId,AcDb::kForWrite);     if(curVTR.openStatus() == Acad::eOk)       {       acutPrintf(_T("n current VIEWRES value %d"),curVTR->circleSides());         curVTR->setCircleSides(100);       }   }