[Connect - C++] FenceManager - set clip mode

Unknown said:

 fenceManager.InitFromActiveFence(*fenceParams, false, true, FenceClipMode::Original);

The confusion may arise from the naming of that method.  It doesn't initialise the fence manager, but rather populates your fenceParams.  After that call, fenceParams should contain the settings you want, but fenceManager is unchanged.

Thank you very much for your swift reply, Jon.

You are right that fenceParams contains the settings I want but when using these settings I don't get the expected result. When I run this code:

virtual StatusInt _OnElementModify(EditElementHandleR eeh) override
{
	if (eeh.GetElementType() == ELLIPSE_ELM)
	{
		FenceManagerR fenceManager = FenceManager::GetManager();
		IndexedViewSetR viewSet = IViewManager::GetManager().GetActiveViewSet();
		fenceManager.DefineByElement(&eeh, viewSet.GetViewport(tcb->lstvw));
		FenceParamsP fenceParams = FenceParams::Create(ISessionMgr::GetActiveDgnModelP());
		fenceManager.InitFromActiveFence(*fenceParams, false, true, FenceClipMode::Original);
			
		// build modelreflist
		DgnModelRefListP modelRefList;
		mdlModelRefList_create(&modelRefList);
		mdlModelRefList_add(modelRefList, ISessionMgr::GetActiveDgnModelP());

		ElementAgenda elmAgenda;
		lifalib_dmsg("fenceParams->GetClipMode() = %d", fenceParams->GetClipMode());
		fenceManager.BuildAgenda(*fenceParams, elmAgenda, modelRefList, true, false, false);
		for (int elmIndex = 0; elmIndex < elmAgenda.size(); elmIndex++)
		{
			ElemAgendaEntry *elm = elmAgenda.GetEntryP(elmIndex);
			elm->DeleteFromModel();
		}
	}
}

not only the elementparts inside the ellipse are deleted. They are deleted completely. I only want to clip the elements and only delete the parts that are inside.

Regards, Evan

FenceManager::BuildAgenda just returns the set of persistent elements that satisfy the FenceParams, it's doesn't modify them. So, in the case of clip, it's treated the same as overlap.

You can then use FenceManager::ClipElement and decided how you want to handle the inside/outside pieces. In your case, it sounds like you want to keep deleting the original like you are already doing, but then also add the outside clip result agenda entries to the model.

HTH

-B

Unknown said:

I would like to use a fence ...

I found this note about the DgnElementSetTool class in MicroStationAPI help...

The DgnElementSetTool class can be used to implement a modify command.

Simplifies dealing with the common element sources. Basic tool operation is to populate an ElementAgenda from the active fence, selection sets, or user locate. The tool's _OnElementModify method will then be called for each entry in the ElementAgenda

In other words, DgnElementSetTool lets us deal with a list of candidate elements in an ElementAgenda, irrespective of the source of its contents.

It also provides enum ClipResult, which seems useful in your case...