ObjectARX完美实现一次拖动多个实体（下）

    这次我们来实现一次拖动多个数据库中已存在的实体，就象AuoCAD里的Move、Rotate、Mirror等命令一样。其中的临时实体类具有一定的通用性，只要给它传入不同的变换矩阵就能实现相应的功能。而Jig类的例子则是一个简单的移动示例，大约相当于Move命令的简化版。

    临时实体类：

//辅助实体类//适用于拖动数据库中已经存在的实体，通常是一个选择集选择的实体集class CDatabaseJigEntity : public AcDbEntity{public:CDatabaseJigEntity(const AcDbObjectIdArray & ids) : m_Ids(ids){}~CDatabaseJigEntity(){}virtual Adesk::Boolean worldDraw (AcGiWorldDraw *mode);void setXform(const AcGeMatrix3d & xform){ m_Xform = xform; }BOOL transform();BOOL transformedCopy();private:AcDbObjectIdArraym_Ids;//保存所有拖动对象的IDAcGeMatrix3dm_Xform;//变换矩阵};Adesk::Boolean CDatabaseJigEntity::worldDraw(AcGiWorldDraw *mode){//这个地方是关键！mode->geometry().pushModelTransform(m_Xform);AcDbEntity* pEnt;for (int i = 0; i < m_Ids.length(); i++){//绘制实体无需写打开if (Acad::eOk == acdbOpenObject(pEnt, m_Ids[i],AcDb::kForRead)){mode->geometry().draw(pEnt);pEnt->close();}}//这句不能少，恢复现场mode->geometry().popModelTransform();return (AcDbEntity::worldDraw (mode)) ;}//用于拖动结束后，将实体变换到新位置BOOL CDatabaseJigEntity::transform(){AcTransaction * pTrans = acTransactionManagerPtr() ->startTransaction();if (NULL == pTrans)return FALSE;AcDbEntity *pEnt;AcDbObject *pObj;for (int i= 0; i < m_Ids.length(); i++){if (Acad::eOk != pTrans ->getObject(pObj, m_Ids[i], AcDb::kForWrite)){acTransactionManagerPtr() ->abortTransaction();return FALSE;}pEnt = AcDbEntity::cast(pObj);pEnt ->transformBy(m_Xform);}acTransactionManagerPtr() ->endTransaction();return TRUE;}//用于拖动结束后，将实体复制到新位置BOOL CDatabaseJigEntity::transformedCopy(){AcTransaction * pTrans = acTransactionManagerPtr() ->startTransaction();if (NULL == pTrans)return FALSE;AcDbEntity *pEnt;AcDbEntity *pNewEnt;AcDbObject *pObj;AcDbBlockTableRecord *pBlkRec;AcDbObjectId blkRecId;for (int i= 0; i < m_Ids.length(); i++){if (Acad::eOk != pTrans ->getObject(pObj, m_Ids[i], AcDb::kForRead)){acTransactionManagerPtr() ->abortTransaction();return FALSE;}pEnt = AcDbEntity::cast(pObj);if (0 == i){blkRecId = pEnt ->blockId();if (Acad::eOk != pTrans ->getObject(pObj, blkRecId, AcDb::kForWrite)){acTransactionManagerPtr() ->abortTransaction();return FALSE;}pBlkRec = AcDbBlockTableRecord::cast(pObj);}pEnt ->getTransformedCopy(m_Xform, pNewEnt);pBlkRec ->appendAcDbEntity(pNewEnt);acTransactionManagerPtr() ->addNewlyCreatedDBRObject(pNewEnt);}acTransactionManagerPtr() ->endTransaction();return TRUE;}

 

    用于移动的Jig类：

//移动实体的拖动类class CMoveJig : public AcEdJig{public:CMoveJig(const AcGePoint3d & fromPoint) : m_pEnt(NULL), m_FromPoint(fromPoint), m_ToPoint(fromPoint){}~CMoveJig();voiddoIt(const AcDbObjectIdArray & ids, bool bCopy = false);virtual DragStatus sampler(); virtual Adesk::Boolean update(); virtual AcDbEntity* entity() const;private:CDatabaseJigEntity*m_pEnt;AcGePoint3dm_FromPoint;AcGePoint3dm_ToPoint;AcGeMatrix3dm_Xform;};CMoveJig::~CMoveJig(){if ( NULL != m_pEnt){delete m_pEnt;m_pEnt = NULL;}}AcEdJig::DragStatus CMoveJig::sampler(){DragStatus stat;setUserInputControls((UserInputControls)(AcEdJig::kAccept3dCoordinates| AcEdJig::kNoNegativeResponseAccepted| AcEdJig::kNoZeroResponseAccepted| AcEdJig::kNullResponseAccepted)); static AcGePoint3d pointTemp;stat = acquirePoint(m_ToPoint, m_FromPoint);if (pointTemp != m_ToPoint)pointTemp = m_ToPoint;else if (stat == AcEdJig::kNormal)stat = AcEdJig::kNoChange;return stat;}Adesk::Boolean CMoveJig::update(){m_Xform.setToTranslation(m_ToPoint - m_FromPoint);m_pEnt ->setXform(m_Xform); return Adesk::kTrue;}AcDbEntity * CMoveJig::entity() const{return m_pEnt;}void CMoveJig::doIt(const AcDbObjectIdArray &ids, bool bCopy /*= false*/){if ( 0 == ids.length() ){return;}if (NULL != m_pEnt){delete m_pEnt;m_pEnt = NULL;}m_pEnt = new CDatabaseJigEntity(ids);setDispPrompt(_T("/n移动到: "));if ( AcEdJig::kNormal == drag() ){if (bCopy){m_pEnt ->transformedCopy();}else{m_pEnt ->transform();}} delete m_pEnt;m_pEnt = NULL;}

 

    测试命令：

static void ZDXMyJig_jigmove(void){ads_name ename; ads_point pt;ads_name ss;int rt; if (rt = acedSSGet(NULL, NULL, NULL, NULL, ss) == RTCAN)return;long len;acedSSLength(ss, &len);if (0 == len) return; AcDbObjectId id; //acdbGetObjectId(id,ename);AcDbObjectIdArray ids;for (int i = 0; i < len; i++){acedSSName(ss, i , ename);acdbGetObjectId(id, ename);ids.append(id);}acedSSFree(ss);acedGetPoint(NULL, L"/n起点：", pt);CMoveJig * pJig = new CMoveJig(asPnt3d(pt));pJig ->doIt(ids);}