Get and Set ACS

Because the example of "ViewInfoExample" is not working correctly and I wasn't able to find examples in this forum, I'll share my code here

A function to create a new ACS and set it as activ acs of a specific view (C++):

static void setAcs() {
	DgnModelRefP modelRef = mdlModelRef_getActive(); // get Active Model
	if (NULL == modelRef)
		return;

	const double uor = mdlModelRef_getUorPerMaster(modelRef); // get Units of Resolution

	RotMatrix acsRot;
	acsRot.InitIdentity() // define a Rotation Matrix
	
	DPoint3d acsOrigin = DPoint3d::From(99.0 * uor, 20.0 * uor, 30.0 * uor); // define a Origin in Master Units

	IAuxCoordSysPtr acs = IACSManager::GetManager().CreateACS(); // Create a ACS-Pointer
	if (acs.IsValid()) {
		acs->SetOrigin(acsOrigin);
		acs->SetName(L"Acs Name");					
		acs->SetRotation(acsRot);					
		acs->SetType(ACSType::Rectangular);			
		acs->SetFlags(ACSFlags::Default);			
		acs->SetDescription(L"Acs Description");
		acs->SetScale(1.0);
		acs->SaveToFile(modelRef, ACSSaveOptions::AllowNew);
	} // Add Information to the ACS-Pointer
	
	
	ViewportR vp = * IViewManager::GetManager().GetActiveViewSet().GetViewport(viewInfoTestData.viewNo); // Get ViewportReference : viewInfoTestData.viewNo is a int
	
	IACSManager::GetManager().SetActive(acs.get(), vp );	// sets the created ACS as Active in the View-Number
}

In the documentation of the function IViewManager::GetViewport(int viewNum) the datatype is IndexedViewportP (IViewManager). But u can use the datatype Viewport instead.

You need a variable vp with datatype ViewportR for the function IACSManager::SetActive(IAuxCoordSysP auxCoordSys, ViewportR vp).

And I show, how I get some information from the activ acs:

static void viewinfo_showViewInfo(MSDialog *dbP)
{
	dbP = mdlDialog_findByTypeAndId(RTYPE_DialogBox, DIALOGID_ViewInfo, NULL);


	DgnModelRefP model = mdlModelRef_getActive();
	if (NULL == model)
		return;

	DgnFileP file = mdlModelRef_getDgnFile(model);
	if (NULL == file)
		return;

	ViewGroupCollectionCP vgc = &file->GetViewGroups();
	ViewGroupP activeViewGroup = vgc->GetActiveP();

	if (NULL == activeViewGroup)
		return;

	ViewInfoCR viewInfo = activeViewGroup->GetViewInfoR(viewInfoTestData.viewNo);

	WString sTemp, sInfo;
	sTemp = viewinfo_getStandardViewInfo(viewInfo);
	sInfo += sTemp;

	WChar pLabel[MAX_UNIT_LABEL_LENGTH];
	const double uor = mdlModelRef_getUorPerMaster(model);
	mdlModelRef_getMasterUnitLabel(model, pLabel);
	sTemp.Sprintf(L"Auflösung (uor): %f per Abstand %s \n", uor, pLabel);
	sInfo += sTemp;

	IAuxCoordSysP acs = viewInfo.GetAuxCoordinateSystem();
	sTemp.Sprintf(L"\nACS name: %s\n", acs->GetName());
	sInfo += sTemp;

	bool isReadOnly = acs->GetIsReadOnly();
	sTemp.Sprintf(L"ACS IsReadOnly: ");
	if (isReadOnly) {
		sTemp += L"Yes\n";
	} else {
		sTemp += L"No\n";
	}
	sInfo += sTemp;

	sTemp.Sprintf(L"ACS description: %s\n", acs->GetDescription());
	sInfo += sTemp;

	sTemp.Sprintf(L"ACS typeName: %s\n", acs->GetTypeName());
	sInfo += sTemp;

	DPoint3d acsOrigin;
	acs->GetOrigin(acsOrigin);
	sTemp.Sprintf(L"ACS origin: (%f, %f, %f) \n", acsOrigin.x / uor, acsOrigin.y / uor, acsOrigin.z / uor);
	sInfo += sTemp;

	RotMatrix acsRot;
	acs->GetRotation(acsRot);
	sTemp.Sprintf(L"ACS rotation (maxAbs): %f \n", acsRot.MaxAbs());
	sInfo += sTemp;

	sTemp.Sprintf(L"ACS scale: %f \n", acs->GetScale());
	sInfo += sTemp;

	sTemp.Sprintf(L"\nClose and reopen the \"ACS\" window, if changes were made!");
	sInfo += sTemp;

	dbP->ItemSetValueByTypeAndId(RTYPE_MultilineText, MLTEXTID_ViewInfoDescription, sInfo.c_str());
}

If there are errors or enhancements, a reply would be nice. Have a nice Day.

Thanks Jon Summers!

Ole Gottwald said:

If there are errors

RotMatrix acsRot;
...
acs->SetRotation(acsRot);

An uninitialised rotation matrix is good for nothing.  Prefer this...

RotMatrix acsRot;
acsRot.InitIdentity();
...
acs->SetRotation(acsRot);

Is edited!

Without the function InitIdentity(), I'm not able to rotate view for example?

Ole Gottwald said:

Without the function InitIdentity(), I'm not able to rotate view for example?

By default, C++ does not initialise a variable. When you write RotMatrix acsRot; the data members of the struct are random.

The identity matrix has zero rotation or scaling.  When you write acsRot.InitIdentity(), the data members of the struct are set to meaningful values.

Ole Gottwald said:

Without the function InitIdentity(), I'm not able to rotate view for example?

By default, C++ does not initialise a variable. When you write RotMatrix acsRot; the data members of the struct are random.

The identity matrix has zero rotation or scaling.  When you write acsRot.InitIdentity(), the data members of the struct are set to meaningful values.