Objectarx之块切割

bool COperaBlockCutting::drawAPlineWithPropertiesFromBlockRef(AcGePoint2dArray pts, AcDbBlockReference* ref, double elevation, AcGeVector3d& normal)
{
AcDbPolyline *pl = new AcDbPolyline;

AcDbObjectId owner;

 

pl->setDatabaseDefaults();

pl->setClosed(Adesk::kTrue);

pl->setThickness(0.0);

 

if (ref != NULL) {

owner = ref->ownerId();

pl->setPropertiesFrom(ref);

}

 

pl->setNormal(normal);

 

for (int i = 0; i < pts.length(); i++)

{

pl->addVertexAt(i, pts[i]);

}

 

pl->setElevation(elevation);

pl->setColorIndex(1); // Red

 

AcDbBlockTableRecord *rec = NULL;

acdbOpenObject(rec, owner, AcDb::kForWrite);

if (rec != NULL)

{

AcDbObjectId id;

rec->appendAcDbEntity(id, pl);

pl->close();

rec->close();

}

else

{

delete pl;

return false;

}

return true;
}

bool COperaBlockCutting::GetBlockClippingPolyline(ads_name blk, AcGePoint2dArray& pts)
{
BOOL ret = FALSE;

AcDbBlockReference *ref = NULL;

AcDbObjectId insId = AcDbObjectId::kNull;

acdbGetObjectId(insId, blk);

if (acdbOpenObject(ref, insId, AcDb::kForRead) != Acad::eOk)

return ret;

 

// Find the clipping object (AcDbSpatialFilter) in the ExtDict of the BlockRef

AcDbObjectId extDicId = ref->extensionDictionary();

if (extDicId == AcDbObjectId::kNull)

return ret;

AcDbDictionary *extDict = NULL, *acadFilterDict = NULL;

if (acdbOpenObject(extDict, extDicId, AcDb::kForRead) != Acad::eOk)

return ret;

Acad::ErrorStatus err = extDict->getAt(_T("ACAD_FILTER"), (AcDbObject*&)acadFilterDict, AcDb::kForRead);

extDict->close();

if (err != Acad::eOk)

return ret;

AcDbSpatialFilter *filter = NULL;

err = acadFilterDict->getAt(_T("SPATIAL"), (AcDbObject*&)filter, AcDb::kForRead);

acadFilterDict->close();

if (err != Acad::eOk)

return ret;

 

// Get the transform matrix stored in the XClip boundary

AcGeMatrix3d xformInBoundary = filter->getClipSpaceToWCSMatrix(xformInBoundary);

// and the transform of the BlockRef at the time when the Filter was set

AcGeMatrix3d xformRefOrig = filter->getOriginalInverseBlockXform(xformRefOrig);

 

// Get the transform matrix that the current BlockRef has, so, we can find the difference

// with the xformRefOrig

AcGeMatrix3d refMatrix = ref->blockTransform();

refMatrix = refMatrix.postMultBy(xformRefOrig);

 

// Calculate the final transform matrix which applies to the points

// returned from filter->getDefinition().

AcGeMatrix3d finalMatrix = refMatrix.postMultBy(xformInBoundary);

 

//AcGePoint2dArray pts;

AcGePoint3dArray pts3d;

 

AcGeVector3d normal;

double elevation = 0, frontClip = 0, backClip = 0;

Adesk::Boolean enabled = false;

 

// Get all boundary points

if (filter->getDefinition(pts, normal, elevation, frontClip, backClip, enabled) == Acad::eOk)

{

// Rectanglar boundary

if (pts.length() == 2)

{

AcGePoint2d p1(pts[1].x, pts[0].y);

AcGePoint2d p3(pts[0].x, pts[1].y);

pts.insertAt(1, p1);

pts.insertAt(3, p3);

}

 

// Transform all points with the transform matrix we calculated

for (int i = 0; i < pts.length(); i++)

{

AcGePoint2d pt2d;

AcGePoint3d pt3d;

pt2d = pts[i];

pt3d[0] = pt2d[0]; pt3d[1] = pt2d[1]; pt3d[2] = 0;

pt3d.transformBy(finalMatrix);

pts3d.append(pt3d);

}

}

// Get the new normal and new ECS information for the polyline.

AcGeVector3d xfnorm = normal.transformBy(finalMatrix);

AcGeMatrix3d plineECS;

 

AcDbPolyline* pline = new AcDbPolyline();

pline->setNormal(xfnorm);

pline->getEcs(plineECS);

delete pline; pline = NULL;

AcGeMatrix3d plineECSInv = plineECS.inverse();

double xfelev = 0.0;

for (int i = 0; i < pts.length(); i++)

{

pts[i].x = pts3d[i].x;

pts[i].y = pts3d[i].y;

 

if (i == 0)

xfelev = pts3d[i].z;

// Should be identical to within roundoff

assert(fabs(xfelev - pts3d[i].z) < 1.0e-10);

}

// Show the boundary
//drawAPlineWithPropertiesFromBlockRef(pts, ref, xfelev, xfnorm);

filter->close();
ref->close();

return true;

}

 

test：

ads_point pt1;
ads_name ent;
if (acedEntSel(_T("请选择裁剪的块:"), ent, pt1) != RTNORM)
return;

AcGePoint2dArray pts;
if (!GetBlockClippingPolyline(ent, pts))
return;