Creating associative dimension in paperspace associated to a modelspace entity

Mar 19, 2015

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<?xml encoding=”UTF-8″>By Balaji Ramamoorthy

Most of the code in this blog post is from a code snippet that my colleague Philippe Leefsma implemented. While his original code created an aligned dimension in paperspace, i have modified it slightly to create an ordinate dimension to cater to a recent developer request.

Here are the code snippets to create aligned and ordinate dimensions in paperspace while retaining their associativity with a reference point on an entity that is in modelspace.

 <span>//For AcDbDimAssoc</span><span> </span>

 <span>#include</span><span>  <span>"dbdimassoc.h"</span><span>  </span></span>

 <span>//For AcDbOsnapPointRef</span><span> </span>

 <span>#include</span><span>  <span>"dbdimptref.h"</span><span> </span></span>

 <span>static</span><span>  <span>void</span><span>  paperRotatedDimAssoc(<span>void</span><span> )</span></span></span>

 <span>{</span>

 	AcDbDatabase* pDb

 		= acdbHostApplicationServices()->workingDatabase();

 	AcDbBlockTableRecordPointer ms(

 		ACDB_MODEL_SPACE, pDb, AcDb::kForWrite);

 	AcDbBlockTableRecordPointer ps(

 		ACDB_PAPER_SPACE, pDb, AcDb::kForWrite);

 	AcDbObjectId lineId, vpId, dimId;

 	AcGePoint3d pt1(AcGePoint3d::kOrigin);

 	AcGePoint3d	pt2(5,0,0);

 	<span>{</span><span>//creates a line</span><span> </span>

 		AcDbObjectPointer<AcDbLine> line;

 		line.create();

 		line->setStartPoint(pt1);

 		line->setEndPoint(pt2);

 		ms->appendAcDbEntity(lineId, line);

 	<span>}</span>

 	<span>{</span><span>//creates a viewport</span><span> </span>

 		AcDbObjectPointer<AcDbViewport> vp;

 		vp.create();

 		ps->appendAcDbEntity(vpId, vp);

 		vp->setWidth(10);

 		vp->setHeight(10);

 		vp->setCenterPoint(AcGePoint3d(5,5,0));

 		vp->setViewDirection(AcDb::kTopView);

 		vp->setViewTarget(AcGePoint3d(2.5,0,0));

 		vp->setViewCenter(AcGePoint2d(2.5,0));

 		vp->setUnlocked();

 		vp->setOn();

 		AcGeMatrix3d ms2ps(

 			AcDbPointRef::mswcsToPswcs(vp));

 		pt1 = pt1.transformBy(ms2ps);

 		pt2 = pt2.transformBy(ms2ps);

 	<span>}</span>

 	<span>{</span><span>//creates the dimension object</span><span> </span>

 		AcDbObjectPointer<AcDbRotatedDimension> dim;

 		dim.create();

 		dim->setXLine1Point(pt1);

 		dim->setXLine2Point(pt2);

 		dim->setDimLinePoint(AcGePoint3d(2,2,0));

 		ps->appendAcDbEntity(dimId, dim);

 	<span>}</span>

 	AcDbObjectPointer<AcDbDimAssoc> assoc;

 	assoc.create();

 	AcDbObjectIdArray arr(2);

 	arr.append(vpId);

 	arr.append(lineId);

 	AcDbFullSubentPath path1(

 		arr,

 		AcDbSubentId(AcDb::kVertexSubentType, 0));

 	AcDbFullSubentPath path2(

 		arr,

 		AcDbSubentId(AcDb::kVertexSubentType, 1));

 	AcGePoint3d refPt1(pt1);

 	AcDbOsnapPointRef *ref1 = <span>new</span><span>  AcDbOsnapPointRef(</span>

 		AcDbPointRef::kOsnapNear, &path1, &path1, &refPt1);

 	AcGePoint3d refPt2(pt2);

 	AcDbOsnapPointRef *ref2 = <span>new</span><span>  AcDbOsnapPointRef(</span>

 		AcDbPointRef::kOsnapNear, &path2, &path2, &refPt2);

 	assoc->setDimObjId(dimId);

 	assoc->setTransSpatial(<span>true</span><span> );</span>

 	assoc->setPointRef(AcDbDimAssoc::kXline1Point, ref1);

 	assoc->setPointRef(AcDbDimAssoc::kXline2Point, ref2);

 	assoc->setAssocFlag(<span>static_cast</span><span> <<span>int</span><span> >(</span></span>

 		AcDbDimAssoc::kFirstPointRef

 		|AcDbDimAssoc::kSecondPointRef));

 	assoc->updateDimension();

 	AcDbObjectId dimAssocId;

 	Acad::ErrorStatus es = acdbPostDimAssoc(

 		dimId, assoc, dimAssocId);

 	acutPrintf(_T(<span>"\npost dim: %s\n"</span><span> ), </span>

 		acadErrorStatusText(es));

 	<span>if</span><span>  (assoc.open(dimAssocId, AcDb::kForWrite)</span>

 		==Acad::eOk)

 	<span>{</span>

 		assoc->startCmdWatcher();

 		assoc->addToPointRefReactor();

 		assoc->addToDimensionReactor();

 	<span>}</span>

 <span>}</span>

 <span>static</span><span>  <span>void</span><span>  paperOrdinateDimAssoc(<span>void</span><span> )</span></span></span>

 <span>{</span>

 	AcDbDatabase* pDb

 		= acdbHostApplicationServices()->workingDatabase();

 	AcDbBlockTableRecordPointer ms(

 		ACDB_MODEL_SPACE, pDb, AcDb::kForWrite);

 	AcDbBlockTableRecordPointer ps(

 		ACDB_PAPER_SPACE, pDb, AcDb::kForWrite);

 	AcDbObjectId lineId, vpId, dimId;

 	AcGePoint3d pt1(AcGePoint3d::kOrigin);

 	AcGePoint3d	pt2(5,0,0);

 	<span>{</span><span>//creates a line</span><span> </span>

 		AcDbObjectPointer<AcDbLine> line;

 		line.create();

 		line->setStartPoint(pt1);

 		line->setEndPoint(pt2);

 		ms->appendAcDbEntity(lineId, line);

 	<span>}</span>

 	<span>{</span><span>//creates a viewport</span><span> </span>

 		AcDbObjectPointer<AcDbViewport> vp;

 		vp.create();

 		ps->appendAcDbEntity(vpId, vp);

 		vp->setWidth(10);

 		vp->setHeight(10);

 		vp->setCenterPoint(AcGePoint3d(5,5,0));

 		vp->setViewDirection(AcDb::kTopView);

 		vp->setViewTarget(AcGePoint3d(2.5,0,0));

 		vp->setViewCenter(AcGePoint2d(2.5,0));

 		vp->setUnlocked();

 		vp->setOn();

 		AcGeMatrix3d ms2ps(

 			AcDbPointRef::mswcsToPswcs(vp));

 		pt1 = pt1.transformBy(ms2ps);

 		pt2 = pt2.transformBy(ms2ps);

 	<span>}</span>

 	<span>{</span><span>//creates the dimension object</span><span> </span>

 		AcDbObjectPointer<AcDbOrdinateDimension> dim;

 		dim.create();

 		dim->setUsingXAxis(<span>true</span><span> );</span>

 		dim->setOrigin(pt1);

 		dim->setDefiningPoint(pt2);

 		dim->setLeaderEndPoint(pt2

 			+ AcGeVector3d(1.0, 0.0, 0.0));

 		ps->appendAcDbEntity(dimId, dim);

 	<span>}</span>

 	AcDbObjectPointer<AcDbDimAssoc> assoc;

 	assoc.create();

 	AcDbObjectIdArray arr(2);

 	arr.append(vpId);

 	arr.append(lineId);

 	AcDbFullSubentPath path1(

 		arr,

 		AcDbSubentId(AcDb::kVertexSubentType, 0));

 	AcDbFullSubentPath path2(

 		arr,

 		AcDbSubentId(AcDb::kVertexSubentType, 1));

 	AcGePoint3d refPt1(pt1);

 	AcDbOsnapPointRef *ref1 = <span>new</span><span>  AcDbOsnapPointRef(</span>

 		AcDbPointRef::kOsnapNear, &path1, &path1, &refPt1);

 	AcGePoint3d refPt2(pt2);

 	AcDbOsnapPointRef *ref2 = <span>new</span><span>  AcDbOsnapPointRef(</span>

 		AcDbPointRef::kOsnapNear, &path2, &path2, &refPt2);

 	assoc->setDimObjId(dimId);

 	assoc->setTransSpatial(<span>true</span><span> );</span>

 	assoc->setPointRef(AcDbDimAssoc::kOriginPoint, ref1);

 	assoc->setPointRef(AcDbDimAssoc::kDefiningPoint, ref2);

 	assoc->setAssocFlag(<span>static_cast</span><span> <<span>int</span><span> >(</span></span>

 		AcDbDimAssoc::kFirstPointRef|

 		AcDbDimAssoc::kSecondPointRef));

 	assoc->updateDimension();

 	AcDbObjectId dimAssocId;

 	Acad::ErrorStatus es =

 		acdbPostDimAssoc

 		(dimId, assoc, dimAssocId);

 	acutPrintf(_T(<span>"\npost dim: %s\n"</span><span> ), </span>

 		acadErrorStatusText(es));

 	<span>if</span><span>  (assoc.open(dimAssocId, AcDb::kForWrite)==Acad::eOk)</span>

 	<span>{</span>

 		assoc->startCmdWatcher();

 		assoc->addToPointRefReactor();

 		assoc->addToDimensionReactor();

 	<span>}</span>

 <span>}</span>

Comments

6 responses to “Creating associative dimension in paperspace associated to a modelspace entity”

Loic

March 27, 2015

Hi Balaji,
What about the new assoc dimensions based on AcDbAssocPersSubentId (http://adndevblog.typepad.com/autocad/2015/02/making-a-custom-entity-associative-dimension-enabled.html) ?
I have some issues to make my custom compound entities compatible with this new behavior and I think having a sample similar to yours but using the new behaviour would help me to understand how it works.
Thanks!
Loic

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Balaji

March 29, 2015

Hi Loic,
Sorry for the delay in replying to you. I had taken a day off last Friday.
I will look into the sample that you shared and see how we can get it to work with the AcdbAssocPersSubentId.
I will get back to you on this.
Regards,
Balaji

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Loic

March 30, 2015

Thanks a lot!
(No worry for the delay, there’s no rush here, I hope you enjoyed your Friday!)

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Abhay Joshi

January 25, 2016

do we need to delete AcDbOsnapPointRef instance?

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Abhay Joshi

September 23, 2016

Hello Balaji,
I am trying to create the associative dimension in paper space same as example. As per your sample code, it works well for top viewport with scale 1:1. But creates issues for dimensions in isometric views with scale other than 1:1. Before creating AcDbDimAssoc object. I override DIMLFAC for dimension by using setDimlfac(). Which include scale (1.22 * 10). It dimension showed correct value after creating it. But after I changed view scale manually, the value is no longer correct.
After checking difference between manual and programmatic dimension in ArxDbg, I found XDATA for ACAD_DIMASSOC_CALC_DIMLFAC, ACAD_DIMASSOC_DIMLFAC and ACAD_DIMASSOC_OVERRIDDEN_DIMLFAC in manual dimensions.
After googling I found link https://forums.autodesk.com/t5/autocad-2000-2000i-2002-archive/paperspace-dimensions-giving-incorrect-values/m-p/141420 for DIMLFAC XDATA. I mentioned to set XDATA for these applications.
In code after creating AcDbDimAssoc I set XDATA to dimension for ACAD_DIMASSOC_OVERRIDDEN_DIMLFAC with lfac*viewscale and ACAD_DIMASSOC_CALC_DIMLFAC with viewscale.
Then dimension worked fine for all manual operations (changing viewscale, modification in line).
Is it safe to set XDATA for DIMLFAC?

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Ari Bejarano

August 18, 2017

Hi Balaji,
This piece of code does not work for me and I do not know what I’m doing wrong, just draw the line and the text appears:
\npost dim: eOk\n
I am using autocad 2018 and ObjectARX 2018, my goal is to do it from .net but I see that it is not yet possible. Could you pass me the complete code, please?

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