Teigha

Teigha是一个软件开发工具包(SDK),由Open Design Alliance (ODA)开发和维护。

// 创建一个完整的块并添加到指定图层
void createBlockWithEntities(OdDbDatabase* pDb, 
                           const OdString& blockName,
                           const OdString& layerName)
{
    try {
        // 1. 首先创建图层
        OdDbLayerTablePtr pLayerTable = pDb->getLayerTableId().safeOpenObject(OdDb::kForWrite);
        OdDbLayerTableRecordPtr pLayer;

        if (!pLayerTable->has(layerName))
        {
            pLayer = OdDbLayerTableRecord::createObject();
            pLayer->setName(layerName);
            // 设置图层属性
            pLayer->setColor(OdCmColor(OdCmEntityColor::kRed)); // 红色
            pLayer->setIsOff(false);
            pLayer->setIsFrozen(false);
            pLayer->setIsLocked(false);
            
            pLayerTable->add(pLayer);
        }
        else
        {
            pLayer = pLayerTable->getAt(layerName).safeOpenObject(OdDb::kForWrite);
        }

        // 2. 创建块表记录
        OdDbBlockTablePtr pBlockTable = pDb->getBlockTableId().safeOpenObject(OdDb::kForWrite);
        OdDbBlockTableRecordPtr pBlockRecord;

        if (!pBlockTable->has(blockName))
        {
            pBlockRecord = OdDbBlockTableRecord::createObject();
            pBlockRecord->setName(blockName);
            pBlockTable->add(pBlockRecord);
        }
        else
        {
            pBlockRecord = pBlockTable->getAt(blockName).safeOpenObject(OdDb::kForWrite);
        }

        // 3. 创建各种图元并添加到块中

        // 3.1 创建直线
        OdDbLinePtr pLine = OdDbLine::createObject();
        pLine->setStartPoint(OdGePoint3d(0, 0, 0));
        pLine->setEndPoint(OdGePoint3d(100, 0, 0));
        pLine->setLayer(layerName);
        pBlockRecord->appendOdDbEntity(pLine);

        // 3.2 创建矩形（使用多段线）
        OdDbPolylinePtr pRect = OdDbPolyline::createObject();
        pRect->setLayer(layerName);
        
        // 添加矩形的四个顶点
        pRect->addVertexAt(0, OdGePoint2d(0, 0));
        pRect->addVertexAt(1, OdGePoint2d(100, 0));
        pRect->addVertexAt(2, OdGePoint2d(100, 50));
        pRect->addVertexAt(3, OdGePoint2d(0, 50));
        pRect->setClosed(true); // 闭合多段线
        
        pBlockRecord->appendOdDbEntity(pRect);

        // 3.3 创建长方体（使用3DSOLID）
        OdDb3dSolidPtr pBox = OdDb3dSolid::createObject();
        pBox->setLayer(layerName);
        
        // 创建长方体
        pBox->createBox(100, 50, 30); // 长100，宽50，高30
        // 移动到指定位置
        pBox->transformBy(OdGeMatrix3d::translation(OdGeVector3d(0, 0, 0)));
        
        pBlockRecord->appendOdDbEntity(pBox);

        // 3.4 创建圆
        OdDbCirclePtr pCircle = OdDbCircle::createObject();
        pCircle->setCenter(OdGePoint3d(50, 25, 0));
        pCircle->setRadius(25);
        pCircle->setLayer(layerName);
        
        pBlockRecord->appendOdDbEntity(pCircle);

        // 4. 创建块引用（在模型空间中插入块）
        OdDbBlockTableRecordPtr pModelSpace = pDb->getModelSpaceId().safeOpenObject(OdDb::kForWrite);
        
        OdDbBlockReferencePtr pBlockRef = OdDbBlockReference::createObject();
        pBlockRef->setBlockTableRecord(pBlockRecord->objectId());
        pBlockRef->setPosition(OdGePoint3d(0, 0, 0));
        pBlockRef->setLayer(layerName);
        
        // 可以设置缩放和旋转
        pBlockRef->setScaleFactors(OdGeScale3d(1.0));
        pBlockRef->setRotation(0.0);
        
        pModelSpace->appendOdDbEntity(pBlockRef);
    }
    catch (const OdError& e)
    {
        // 错误处理
        throw e;
    }
}

// 使用示例
void example()
{
    OdDbDatabase* pDb = /* 获取数据库指针 */;
    
    // 创建一个名为"MyBlock"的块，并将其添加到名为"MyLayer"的图层中
    createBlockWithEntities(pDb, L"MyBlock", L"MyLayer");
}