topic Re: How to get access to a layout's model space? in ObjectARX Forum

How to get access to a layout's model space?

syx_lemans — Mon, 06 Mar 2017 14:53:12 GMT

Hello everyone,

I am trying to freeze some layers in paper layout's model viewport.

With the code below, I can get all paper viewports. But I don't how to get access of model space using objectarx.

Thank you in advance.


  static AcDbObjectIdArray GetViewportArray(AcDbLayout *pLayout)
  {
    AcDbObjectIdArray ids;
    AcDbBlockTableRecordPointer pBtr(pLayout->getBlockTableRecordId(), AcDb::kForRead);

    if (pBtr.openStatus() == Acad::eOk) {
      AcDbBlockTableRecordIterator *pIter = NULL;

      if (pBtr->newIterator(pIter) == Acad::eOk && pIter) {
        for (; !pIter->done(); pIter->step()) {
          AcDbObjectId id;
	
          if (pIter->getEntityId(id) == Acad::eOk) {
			  if (id.objectClass() == AcDbViewport::desc())
              ids.append(id);
          }
        }
        delete pIter;
		
      }
    }
    return ids;
  }

Re: How to get access to a layout's model space?

tbrammer — Mon, 06 Mar 2017 15:14:53 GMT

You are trying to freeze some layers in a viewport. Period.

There is no seperate "model viewport" in the layout. Viewports are in the paperspace blocktablerecord of your layout.

Your code is ok - it finds the AcDbViewports within the layout.

All you have to do is to freeze the layers within the AcDbViewport. Just use the methods

class AcDbViewport: public AcDbEntity
{
public:
    Acad::ErrorStatus freezeLayersInViewport(const AcDbObjectIdArray&);
    Acad::ErrorStatus thawLayersInViewport(const AcDbObjectIdArray&);
    Acad::ErrorStatus thawAllLayersInViewport();
    bool              isLayerFrozenInViewport(const AcDbObjectId& layerId) const;
    Acad::ErrorStatus getFrozenLayerList(AcDbObjectIdArray& ids) const;
}

Or do you plan to freeze Layers when the user changes to MSPACE and thaw them when he changes to PSPACE?

This would require a reactor.

Re: How to get access to a layout's model space?

syx_lemans — Mon, 06 Mar 2017 15:41:07 GMT

Thank you for your reply. But I am comfused with something

AcDbObjectIdArray viewPorts = GetViewportArray(pLayout);
pLayout->close();
if (viewPorts.length() > 0) {
AcDbObjectPointer<AcDbViewport> pVport(viewPorts[0], AcDb::kForWrite);
 if (pVport.openStatus() == Acad::eOk) {
   pVport->freezeLayersInViewport(frozenLayers);
   }
}

frozenLayers is my object id array of layers.

My original layout is like this:

With my application, I can creat a new layout "presentation2", and freeze the layers I want in paper space

But when I switch to model space of the same layout. I find that nothing is frozen in model space mode.

Re: How to get access to a layout's model space?

tbrammer — Mon, 06 Mar 2017 16:04:41 GMT

I see what you mean.

Besides the AcDbViewport entities that you can see in your layout, there is also always the "paperspace viewport", which is an AcDbViewport as well.

This is the viewport through which you see your layout. If you freeze layers in a viewport while in paperspace you are changing this viewport.

I always recomment to use the great ArxDbg.arx with command SNOOPDB. You find the project in <ARX>samples\database\ARXDBG:

The paperspace viewport has the Number 1 (which is the content of the CVPORT variable).

Re: How to get access to a layout's model space?

syx_lemans — Mon, 06 Mar 2017 17:06:46 GMT

Thank you, I will try it

Re: How to get access to a layout's model space?

syx_lemans — Wed, 08 Mar 2017 17:33:33 GMT

I've solved it by adding loop for all viewports

if (viewPorts.length() > 0) {
				for(int i =0;i<viewPorts.length();i++)
				{
					AcDbObjectPointer<AcDbViewport> pVport(viewPorts[i], AcDb::kForWrite);
					if (pVport.openStatus() == Acad::eOk) {
						pVport->freezeLayersInViewport(frozenLayers);						
					}
				}
            }

Re: How to get access to a layout's model space?

Anonymous — Tue, 28 Mar 2017 14:15:21 GMT

Just one question to make sysvar CVPORT clear:

if in layout, but not in any viewport only in paperspace, CVPORT is 1

if in layout and in viewport modelspace, CVPORT is 2, 3, 4... depending which viewport - they are increased by creation chronologically

if in model, CVPORT is 2.

is this correct? what is CVPORT 1 for model?

Re: How to get access to a layout's model space?

tbrammer — Wed, 29 Mar 2017 06:50:15 GMT

Yes, this is correct.

In "model" (TILEMODE=1) CVPORT=1 is invalid. CVPORT=1 is the "paperspace viewport" which doesn't exist in TILEMODE=1.

You can split the model view into multiple viewports with the _VPORTS command. If you have created three viewports they will have CVPORT=2, CVPORT=3 and CVPORT=4. You can switch the active viewport by entering "CVPORT 3" or "_setvar CVPORT 3".

Re: How to get access to a layout's model space?

Anonymous — Sat, 01 Apr 2017 14:52:46 GMT

thanks