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admin 发表于 2024-5-4 18:13:31

arx 获取三维实体边、面，并高亮

void
highlightEdge(const AcDbObjectId& objId, const int marker)
{
    TCHAR dummy; // space for acedGetStringB pauses below

    AcDbEntity *pEnt;
    acdbOpenAcDbEntity(pEnt, objId, AcDb::kForRead);
    AcGePoint3d pickpnt;
    AcGeMatrix3d xform;
    int numIds;
    AcDbFullSubentPath *subentIds;
    pEnt->getSubentPathsAtGsMarker(AcDb::kEdgeSubentType,
      marker, pickpnt, xform, numIds, subentIds);

    // At this point the subentId's variable contains the
    // address of an array of AcDbFullSubentPath objects.
    // The array should be one element long, so the picked
    // edge's AcDbFullSubentPath is in subentIds.
    //
    // For objects with no edges (such as a sphere), the
    // code to highlight an edge is meaningless and must
    // be skipped.
    //
    if (numIds > 0) {
      // Highlight the edge.
      //
      pEnt->highlight(subentIds);

      // Pause to let user see the effect.
      //
      acedGetString(0, 采用T("\npress <RETURN> to continue..."),
            dummy);

      // Unhighlight the picked edge.
      //
      pEnt->unhighlight(subentIds);

      // Get a copy of the edge, and add it to the database.
      //
      AcDbEntity *pEntCpy = pEnt->subentPtr(subentIds);
      AcDbObjectId objId;
      addToModelSpace(objId, pEntCpy);

    }
    delete []subentIds;

    pEnt->close();
}
void
highlightFaces(const AcDbObjectId& objId, const int marker)
{
    TCHAR dummy;

    AcDbEntity *pEnt;
    acdbOpenAcDbEntity(pEnt, objId, AcDb::kForRead);

    // Get the subentIds for the faces.
    //
    AcGePoint3d pickpnt;
    AcGeMatrix3d xform;
    int numIds;
    AcDbFullSubentPath *subentIds;
    pEnt->getSubentPathsAtGsMarker(AcDb::kFaceSubentType,
      marker, pickpnt, xform, numIds, subentIds);

    // Walk the subentIds list, highlighting each face subentity.
    //
    for (int i = 0;i < numIds; i++) {
      pEnt->highlight(subentIds); // Highlight face.

      // Pause to let the user see the effect.
      //
      acedGetString(0, 采用T("\npress <RETURN> to continue..."),
            dummy);

      pEnt->unhighlight(subentIds);
    }
    delete []subentIds;
    pEnt->close();
}
void
highlightAll(const AcDbObjectId& objId)
{
    TCHAR dummy;

    AcDbEntity *pEnt;
    acdbOpenAcDbEntity(pEnt, objId, AcDb::kForRead);

    // Highlight the whole solid.
    //
    pEnt->highlight();

    // Pause to let user see the effect.
    //
    acedGetString(0, 采用T("\npress <RETURN> to continue..."),
      dummy);

    pEnt->unhighlight();
    pEnt->close();
}


Acad::ErrorStatus
addToModelSpace(AcDbObjectId &objId, AcDbEntity* pEntity)
{
    AcDbBlockTable *pBlockTable;
    AcDbBlockTableRecord *pSpaceRecord;

    acdbHostApplicationServices()->workingDatabase()
      ->getSymbolTable(pBlockTable, AcDb::kForRead);

    pBlockTable->getAt(ACDB采用MODEL采用SPACE, pSpaceRecord,
      AcDb::kForWrite);

    pSpaceRecord->appendAcDbEntity(objId, pEntity);

    pBlockTable->close();
    pEntity->close();
    pSpaceRecord->close();

    return Acad::eOk;
}

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