Creating Entities

The following ObjectARX code creates the line and adds it to the model space block table record:

AcDbObjectId
createLine()
{
    AcGePoint3d startPt(4.0, 2.0, 0.0);
    AcGePoint3d endPt(10.0, 7.0, 0.0);
    AcDbLine *pLine = new AcDbLine(startPt, endPt);
    AcDbBlockTable *pBlockTable;
    acdbHostApplicationServices()->workingDatabase()
        ->getSymbolTable(pBlockTable, AcDb::kForRead);
    AcDbBlockTableRecord *pBlockTableRecord;
    pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord,
        AcDb::kForWrite);
    pBlockTable->close();
    AcDbObjectId lineId;
    pBlockTableRecord->appendAcDbEntity(lineId, pLine);
    pBlockTableRecord->close();
    pLine->close();
    return lineId;
}

The createLine() routine obtains the block table for the current drawing. Then it opens the model space block table record for writing. After closing the block table, it adds the entity to the block table record and then closes the block table record and the entity.

Note:

When you are done using any ObjectARX objects, you must explicitly close them as soon as possible.

The following createCircle() routine creates the circle and adds it to the model space block table record:

AcDbObjectId
createCircle()
{
    AcGePoint3d center(9.0, 3.0, 0.0);
    AcGeVector3d normal(0.0, 0.0, 1.0);
    AcDbCircle *pCirc = new AcDbCircle(center, normal, 2.0);
    AcDbBlockTable *pBlockTable;
    acdbHostApplicationServices()->workingDatabase()
        ->getSymbolTable(pBlockTable, AcDb::kForRead);
    AcDbBlockTableRecord *pBlockTableRecord;
    pBlockTable->getAt(ACDB_MODEL_SPACE, pBlockTableRecord,
        AcDb::kForWrite);
    pBlockTable->close();
    AcDbObjectId circleId;
    pBlockTableRecord->appendAcDbEntity(circleId, pCirc);
    pBlockTableRecord->close();
    pCirc->close();
    return circleId;
}