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- 在ObjectARX中,将用户选择的图块参照(Block Reference)转换成基于其内部图形元素重新生成的新图块的过程确实涉及多个步骤。以下是一个高层面的步骤概述以及简化的代码示例:
- 1. **获取用户选择**:
- - 首先需要通过`acedEntSel`或`ads采用ssget`等函数让用户选择一个块参照。
- ```cpp
- AcDbObjectId blkRefId;
- ads采用name entName;
- if (acedEntSel(NULL, "Select a block reference:", asDSSelection, entName) == RTNORM)
- {
- AcDbEntity* pEnt;
- acdbOpenAcDbEntity(pEnt, entName, AcDb::kForRead);
- if (pEnt->isKindOf(AcDbBlockReference::desc()))
- {
- AcDbBlockReference* pBlkRef = AcDbBlockReference::cast(pEnt);
- blkRefId = pBlkRef->objectId();
- }
- pEnt->close();
- }
- ```
- 2. **提取块参照中的图形元素**:
- - 通过遍历块参照的所有子对象,可以得到内部的所有图形元素。
- ```cpp
- Acad::ErrorStatus es;
- AcDbBlockTableRecord* pNewBlkDef;
- AcDbBlockReference* pBlkRef = NULL;
- acdbOpenObject(pBlkRef, blkRefId, AcDb::kForRead);
- AcDbVoidPtrArray objectsToClone;
- pBlkRef->appendObjectsToClone(objectsToClone, Adesk::kTrue);
- pBlkRef->close();
- // 创建一个新的块定义
- es = acdbHostApplicationServices()->workingDatabase()->
- createBlockTableRecord(采用T("NewBlockName"), pNewBlkDef, AcDb::kDHL采用Keep);
- // 克隆并添加到新块定义
- for (int i = 0; i < objectsToClone.length(); i++)
- {
- AcDbObject* pObj;
- objectsToClone[i]->upgradeOpen(pObj, AcDb::kForWrite);
- pObj->copy(pNewBlkDef);
- pObj->close();
- }
- // 更新新块定义的状态和写入数据库
- pNewBlkDef->setFlagBits(/* 设置必要的块定义属性 */);
- pNewBlkDef->writeOk(true);
- pNewBlkDef->close();
- ```
- 3. **插入新生成的块参照**:
- - 在适当的位置插入新的块参照。
- ```cpp
- AcDbBlockReference* pNewBlkRef;
- pNewBlkDef->openForRead(pNewBlkRef);
- AcGePoint3d insertPt = /* 获取原块参照的插入点 */;
- pNewBlkRef->setPosition(insertPt);
- pNewBlkRef->setSpace(blkRef.space());
- // 插入新块参照到当前空间
- AcDbObjectId newBlkRefId;
- acdbModelSpace().appendAcDbEntity(newBlkRefId, pNewBlkRef);
- pNewBlkRef->close();
- ```
- 。
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