自定义实体制作中出现 的问题

yoursmile

我从AcDbEntity派生了一个子类AzhtEntity，然后又从AzhtEntity派生AzhtBreaker，如下：一些必须的重载函数还有些返回值都已省略，
AzhtEntity中：
class AzhtEntity:public AcDbEntity
{
public:
ACRX_DECLARE_MEMBERS(AzhtEntity);
AzhtEntity();
virtual ~AzhtEntity();
.....................................
.....................................
..................moveGripPointsAt()..........
..................getGripPoints()................
..................transformBy()..................
.........................................................
........................................................
private:
AcGePoint3d m_insertPt; //插入点
};

AzhtEntity::getGripPoints(AcGePoint3dArray& gripPoints, AcDbIntArray& osnapModes, AcDbIntArray& geomIds) const
{
assertReadEnabled();
gripPoints.append(m_insertPt);
return Acad::eOk;
}

AzhtEntity::moveGripPointsAt(const AcDbIntArray& indices, const AcGeVector3d& offset)
{
assertWriteEnabled();
return Acad::eOk;
}

AzhtEntity::transformBy(const AcGeMatrix3d& xform)
{
assertWriteEnabled();
return Acad::eOk;
}
AzhtBreaker中：
class AzhtBreaker:public AzhtEntity
{
public:
ACRX_DECLARE_MEMBERS(AzhtBreaker);
AzhtBreaker();
virtual ~AzhtBreaker();
.....................................
.....................................
..................moveGripPointsAt()..........
..................getGripPoints()................
..................transformBy()..................
.........................................................
........................................................
private:
AcGePoint3d m_otherPt; //插入点
};
AzhtBreaker::getGripPoints(AcGePoint3dArray& gripPoints, AcDbIntArray& osnapModes, AcDbIntArray& geomIds) const
{
assertReadEnabled();
int iDirection = ((AzhtEntity*)this)->getDirection();
AcGePoint3d insertPt = ((AzhtEntity*)this)->getInsertPt();
gripPoints.append(m_otherPt);
AzhtEntity::getGripPoints(gripPoints, osnapModes, geomIds);
return Acad::eOk;
}

AzhtBreaker::moveGripPointsAt(const AcDbIntArray& indices, const AcGeVector3d& offset)
{
assertWriteEnabled();
//若没有选中点或偏移为0
if(indices.length()==0 || offset.isZeroLength())
return Acad::eOk;
return transformBy(AcGeMatrix3d::translation(offset));
}

AzhtBreaker::transformBy(const AcGeMatrix3d& xform)
{
assertWriteEnabled();
AcGePoint3d insertPt = getInsertPt();
insertPt.transformBy(xform);
m_otherPt.transformBy(xform);

return Acad::eOk;
}

我这样做之后，能够得到夹点，但在移动的时候出现问题，说什么内存不足！请高手指教一下，谢谢！！！！！！

在下想知道，在重载这些函数的时候需要有些什么原则和注意的地方吗？ 

easypower

看你的worlddraw，估计是那的问题