topic Re: How to highlight a line in a Block(reference)? in ObjectARX Forum

How to highlight a line in a Block(reference)?

Anonymous — Thu, 27 Oct 2016 15:47:28 GMT

There is a block which contains AcDbLines.
This block is used via a single BRef.
How do I highlight a line? Obviously this function must be called:

Acad::ErrorStatus AcDbEntity::highlight(const AcDbFullSubentPath& subId = kNullSubent, ...

As the object of which highlight is called, I tried both the BRef and the AcDbLine.
As the first parameter I tried both kNullSubent and a subent that I created like this:

AcDbFullSubentPath oMyPath;
AcDbObjectIdArray &rObjIds = oMyPath.objectIds();
rObjIds.append(idOfBlockOfBRef); // idBtr2idBRef(idBtr));
rObjIds.append(pEnt->objectId());
AcDbSubentId &rSubentId = oMyPath.subentId();
rSubentId.setType(kEdgeSubentType);

I also tried it without the last two lines.

The results:

BRef + oMyPath: eInvalidInput
BRef + kNullSubent: Complete "Bref" (iow complete block at the correct location) is highlighted.
Line + oMyPath: eInvalidInput
Line + kNullSubent + any mode other than 2D wireframe: Line is highlighted as if the block(ref) would be positioned at 0,0,0
Line + kNullSubent + 2D wireframe: No error result, no visual effect.

So, nothing is like I want (only the single line highlighted at the correct position)

Any ideas?

Re: How to highlight a line in a Block(reference)?

deepak.a.s.nadig — Thu, 27 Oct 2016 18:30:54 GMT

Here is a quick sample I have written to get line entities in a block reference and highlight them :

void TestLine()
{
	AcDbBlockTable* pTable; 
	acdbHostApplicationServices()->workingDatabase()->getBlockTable
		(
		pTable,
		AcDb::kForRead
		);
	if(pTable == NULL)
		return; 

	AcDbBlockTableIterator* pTableIter;
	for( pTable->newIterator(pTableIter); !pTableIter->done(); pTableIter->step())
	{     
		AcDbBlockTableRecord* pRecord;     
		pTableIter->getRecord(pRecord,AcDb::kForRead);  
		if(pRecord == NULL)
		{   
			acutPrintf(_T("\nCannot open a BTR"));  
			continue;   
		} 

		AcDbBlockTableRecordIterator* pRecordIter;
		for (    pRecord->newIterator(pRecordIter);
			! pRecordIter->done();
			pRecordIter->step()
			)
		{
			AcDbEntity*pEnt;    
                        const AcDbFullSubentPath subentIds; 
			pRecordIter->getEntity(pEnt, AcDb::kForRead);
			AcDbLine *pLine = NULL;
			pLine = AcDbLine::cast( pEnt );
			if ( pLine)
			{
				pEnt->subentPtr(subentIds);
				pEnt->highlight(subentIds);
				pEnt->close();
			}

		}   
		delete pRecordIter;   
		pRecord->close(); 
	}  
	pTable->close();
	delete pTableIter;
}

Re: How to highlight a line in a Block(reference)?

Anonymous — Fri, 28 Oct 2016 14:58:46 GMT

Thank you very much.

On my computer your code leads to the same behaviour as mine (highlights a "ghost block at 0,0,0" when visual style is not 2D wireframe). I have to say I am using ACAD 2106.

I found out my boss has Acad 2017 installed and there is no "ghosting" on his computer. Do you know whether this a known bug in ACAD2016?

Bye bye,

Wolfram Kuss,

imos3d.com

Re: How to highlight a line in a Block(reference)?

Alexander.Rivilis — Tue, 01 Nov 2016 07:08:33 GMT

I can reproduce this issue in AutoCAD 2016 with all updates:

Re: How to highlight a line in a Block(reference)?

66713205 — Thu, 26 Dec 2024 02:48:59 GMT

it not work in autocad2020