AcDbSpatialFilter的使用，由于使用较少，arx中找不到资料，记录，备用

static void Test_Clip ()

{

ads_point pt1, pt2;

ads_name ent;

if (acedEntSel(_T(“Select xref:”), ent, pt1) != RTNORM)

return;

AcDbObjectId idXref;

if (acdbGetObjectId(idXref,ent) != Acad::eOk)

return;

AcDbObjectPointer<<span style=”color: rgb(43, 145, 175);”>AcDbBlockReference> pRef(idXref, AcDb::kForRead);

if (pRef.openStatus() != Acad::eOk) {

acutPrintf(_T(“Not an xref!\n”));

return;

}

AcGePoint2dArray pts;

if (acedGetPoint(NULL,_T(“First point:”), pt1) != RTNORM) {

pRef->close();

return;

}

//the ECS of the vertices must be defined in the

//coordinate system of the _block_ so let’s calculate

//transform all points to that coordinate system

AcGeMatrix3d mat(pRef->blockTransform());

mat.invert();

AcGePoint3d pt3d(asPnt3d(pt1));

pt3d.transformBy(mat);

pts.append(AcGePoint2d(pt3d.x, pt3d.y));

while (acedGetPoint(pt1,_T(“Next point:”), pt2) == RTNORM) {

acedGrDraw(pt1, pt2, 1, 1);

pt3d = asPnt3d(pt2);

pt3d.transformBy(mat);

pts.append(AcGePoint2d(pt3d.x, pt3d.y));

memcpy(pt1, pt2, sizeof(ads_point));

}

acedRedraw(NULL,0);

AcDbDatabase* pDb = acdbHostApplicationServices()->workingDatabase();

AcGeVector3d normal;

double elev;

if (pDb->tilemode()) {

normal = pDb->ucsxdir().crossProduct(pDb->ucsydir());

elev = pDb->elevation();

} else {

normal = pDb->pucsxdir().crossProduct(pDb->pucsydir());

elev = pDb->pelevation();

}

normal.normalize();

Acad::ErrorStatus es = pRef.object()->upgradeOpen();

if (es != Acad::eOk) {

pRef->close();

return;

}

//create the filter

AcDbSpatialFilter* pFilter = new AcDbSpatialFilter;

//add it to the extension dictionary of the block reference

//the AcDbIndexFilterManger class provides convenient utility functions

if (AcDbIndexFilterManager::addFilter(pRef.object(), pFilter) !=Acad::eOk)

delete pFilter;

else {

acutPrintf(_T(“Filter has been succesfully added!\n”));

pRef.object()->downgradeOpen();

}

if (pFilter->setDefinition(pts,normal,elev,

ACDB_INFINITE_XCLIP_DEPTH,-ACDB_INFINITE_XCLIP_DEPTH, true) !=Acad::eOk)

{

acutPrintf(L”Filter setDefinition failed.”);

//remove the filter if setDefinition fails.

pFilter->erase();

 

}

es = pFilter->erase();

pFilter->close();

pRef->close();

 

}