ObjectARX视口旋转示例源码

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[code]//视口旋转
  ads_name ent;
  ads_point pt;
  if (RTNORM != acedEntSel(_T("\n选择视口: "),ent,pt))
  {
   return;
  }
  AcDbObjectId objId=AcDbObjectId::kNull;
  Acad::ErrorStatus es = acdbGetObjectId(objId,ent);
  AcDbEntity *pEnt=NULL;
  es = acdbOpenAcDbEntity(pEnt,objId,AcDb::kForWrite);
  if (es != Acad::eOk)
  {
   return;
  }
  if (pEnt->isKindOf(AcDbViewport::desc()))
  {
   AcDbViewport *pViewPort=AcDbViewport::cast(pEnt);
   AcGePoint2d ptCenter= pViewPort->viewCenter();
   pViewPort->setTwistAngle(pViewPort->twistAngle() + 3.14159265358979323846*0.5);
   ptCenter.rotateBy(3.14159265358979323846*0.5);
   pViewPort->setViewCenter(ptCenter);
  }
  pEnt->close();[/code]