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ObjectARX 开发指南

创建实体

2023-1-1 07:25| 发布者: admin| 查看: 372| 评论: 0|来自: AutoCAD

以下 ObjectARX 代码创建该行并将其添加到模型空间块表记录中：

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;
}

例程获取当前图形的块表。然后，它打开模型空间块表记录进行写入。关闭块表后，它将实体添加到块表记录中，然后关闭块表记录和实体。createLine()

注意：

使用完任何 ObjectARX 对象后，必须尽快显式关闭它们。

以下例程创建圆并将其添加到模型空间块表记录中：createCircle()

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;
}