请教大虾们~~如何将一个多边形用矩形外接?

lanhaiou

在AutoCAD中的一个多边形图形,想把它用矩形外接,框起来.

我对objectarx还不很熟悉,不清楚有那些方法实现

有没有直接操作的函数?

要不然就先读多边形的每个顶点,经过判断后用直线化一个矩形?

帮我讲讲可能实现的思路好吗?谢谢~~~~~~~~~~~~!!

HuaiYu

用 getGeomExtents 得到实体的外围框后再添加一个轻多段线就可以吧...

void test()
{
 ads_name en;
 ads_point pt;
 if(acedEntSel("\nSpecify a object:",en,pt)!=RTNORM)
  return;
 AcDbObjectId eId;
 acdbGetObjectId(eId,en);
 AcDbEntity *pEnt;
 acdbOpenAcDbEntity(pEnt,eId,AcDb::kForRead);
 AcDbExtents exts;
 if(pEnt->getGeomExtents(exts)!=Acad::eOk)
 {
  acutPrintf("\n**Error on get the extents point...");
  pEnt->close();
  return;
 }
 acutPrintf("\nThe maxPoint=%0.4f,%0.4f",exts.maxPoint()[X],exts.maxPoint()[Y]);
 acutPrintf("\nThe minPoint=%0.4f,%0.4f",exts.minPoint()[X],exts.minPoint()[Y]);
 pEnt->close();
 
 // will be add a polyline to the ModelSpace
 // the vertex point will be add to the ptArray
 AcGePoint3dArray ptArray;
 ptArray.append(exts.minPoint());
 AcGePoint3d ptTemp;
 ptTemp[X]=exts.maxPoint()[X];
 ptTemp[Y]=exts.minPoint()[Y];
 ptTemp[Z]=exts.minPoint()[Z];
 ptArray.append(ptTemp);
 ptArray.append(exts.maxPoint());
 ptTemp[X]=exts.minPoint()[X];
 ptTemp[Y]=exts.maxPoint()[Y];
 ptTemp[Z]=exts.minPoint()[Z];
 ptArray.append(ptTemp);

 AcDb2dPolyline *pNewLine=new AcDb2dPolyline(AcDb::k2dSimplePoly,ptArray,0.0,Adesk::kTrue);
 pNewLine->setColorIndex(1);

 AcDbBlockTable *pBlockTable;
 acdbHostApplicationServices()->workingDatabase()->getSymbolTable(pBlockTable,AcDb::kForRead);
 AcDbBlockTableRecord *pMS;
 pBlockTable->getAt(ACDB_MODEL_SPACE,pMS,AcDb::kForWrite);
 pBlockTable->close();
 pMS->appendAcDbEntity(eId,pNewLine);
 pNewLine->close();
 pMS->close();
}

lanhaiou

哇塞~~~~~~~

大虾

谢谢你啊~~!!!