[MSCE C++]是否有办法在2d model中显示隐藏边

Question

在3d model中，可以通过设置&ldquo;显示样式&rdquo;中的&ldquo;隐藏边&rdquo;来实现被遮挡实体边的虚线显示，如下图

那么是否有办法将这种显示效果体现在2d的model中呢，比如说在2d model中创建一个三维物体的轴测图，其中被遮挡的边界是虚线显示。如果有，如何通过代码来实现？

HongQiang Guo · Accepted Answer

参考如下代码： 
 
struct MyElementOutputProcessor: VisibleEdgesLib::ElementOutputProcessor
{
	//! This method is called for each element after processing the view or elements.
 StatusInt _ProcessOutput(EditElementHandleR eh3d, EditElementHandleP eh2d, DgnModelRefP modelRef, bool isVisible, bool isEdge, ViewContextR viewContext)override

	{ 
 eh3d.AddToModel();
 return SUCCESS;
	}


 virtual StatusInt _ProcessAnnotation(EditElementHandleR eh3d, EditElementHandleP eh2d, DgnModelRefP modelRef, ViewContextR viewContext)override
 {
 eh3d.AddToModel();
 return SUCCESS;
	}

	//! Return true to get the handle of 2D element in _ProcessOutput() otherwise false.
	virtual bool _DoCreate2dElement() { return false; }

}; // ElementOutputProcessor

void TestVisibleEdgesLib()
{ 
	ElementAgenda selectset;
	SelectionSetManager::GetManager().BuildAgenda(selectset);
	if (!selectset.GetCount())
	{
 return;
	}
	ElementPropertiesSetterPtr elePropSet = ElementPropertiesSetter::Create();
	EditElementHandleR eeh = selectset.at(0);
	elePropSet->SetColor(0);
	elePropSet->Apply(eeh);
	MSElementDescrP elmdscr = NULL;
	mdlElmdscr_duplicate(&elmdscr, selectset[0].GetElementDescrCP());
	for (size_t i = 1; i < selectset.GetCount(); i++)
	{
 EditElementHandleR eehCur = selectset.at(i);
 elePropSet->SetColor((UInt32)i);
 elePropSet->Apply(eehCur);
 MSElementDescrP curElmdscr = NULL;
 mdlElmdscr_duplicate(&curElmdscr, eehCur.GetElementDescrCP());
 mdlElmdscr_addToChain(elmdscr, curElmdscr);
	}

	MyElementOutputProcessor myProcessor;
	VisibleEdgesLib::ProcessElements(myProcessor, elmdscr, mdlView_getViewport(tcb->lstvw), 0, true, 0, 10);
	mdlElmdscr_freeAll(&elmdscr);
} 、 
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[MSCE C++]是否有办法在2d model中显示隐藏边

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