Intersection of 2 Hatch

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The only way I have found is obtainig the loops and intersecting them (Thanks Ing. B.C.). This is my code snippet. It only works when the number of Loops are equal and loops are built from lines. This is enough for me. I dont know if there is a simply way to do the same. Any suggestions? bool IntersectionOf2Hatch(AcDbHatch *pHatch1, AcDbHatch *pHatch2) { /* Return: true: Found an intersection false: no intersections */ int loops1 = pHatch1->numLoops(); int loops2 = pHatch2->numLoops(); AcDbObjectIdArray loopIds1; AcDbObjectIdArray loopIds2; for (int i = 0; i < loops1; ++i) { long loopType1; AcGeVoidPointerArray edgePtrs1; AcGeIntArray edgeTypes1; long loopType2; AcGeVoidPointerArray edgePtrs2; AcGeIntArray edgeTypes2; AcDb3dPolyline *pPol1 = NULL; AcDb3dPolyline *pPol2 = NULL; if (pHatch1->getLoopAt(i, loopType1, edgePtrs1, edgeTypes1) == Acad::eOk) { for (int j = 0; j < edgePtrs1.length(); j++) { AcGePoint3d point1; switch (edgeTypes1){ case AcDbHatch::kLine: { AcGeLineSeg3d *pGeLine3d = (AcGeLineSeg3d*)edgePtrs1; point1 = pGeLine3d->startPoint(); AcDb3dPolylineVertex *pVertex = new AcDb3dPolylineVertex(point1); if (pPol1 == NULL) pPol1 = new AcDb3dPolyline(); pPol1->appendVertex(pVertex); } break; case AcDbHatch::kCirArc: case AcDbHatch::kEllArc: case AcDbHatch::kSpline: default: break; } } if (pPol1 != NULL) pPol1->makeClosed(); } if (pHatch2->getLoopAt(i, loopType2, edgePtrs2, edgeTypes2) == Acad::eOk) { for (int k = 0; k < edgePtrs2.length(); k++) { AcGePoint3d point2; switch (edgeTypes2){ case AcDbHatch::kLine: { AcGeLineSeg3d *pGeLine3d = (AcGeLineSeg3d*)edgePtrs2; point2 = pGeLine3d->startPoint(); AcDb3dPolylineVertex *pVertex = new AcDb3dPolylineVertex(point2); if (pPol2 == NULL) pPol2 = new AcDb3dPolyline(); pPol2->appendVertex(pVertex); } break; case AcDbHatch::kCirArc: case AcDbHatch::kEllArc: case AcDbHatch::kSpline: default: break; } } if (pPol2 != NULL) pPol2->makeClosed(); } if (pPol1 != NULL && pPol2 != NULL) { AcGePoint3dArray points; if (pPol1->intersectWith(pPol2, AcDb::kOnBothOperands, points) == Acad::eOk) { if (points.length() > 0) { delete pPol1; delete pPol2; return true; } } } if (pPol1 != NULL) delete pPol1; if (pPol2 != NULL) delete pPol2; } return false; } "developer" escribió en el mensaje news:41ff7ef0$1_1@newsprd01... > Hello, > Is there a way to know if one hatch intersects with another hatch? > Thanks in advance, > Helio. > >

admin

mjsduct::intersectWith(const AcDbEntity* pEnt,
> AcDb::Intersect intType,
> AcGePoint3dArray& points,
> int thisGsMarker = 0,
> int otherGsMarker = 0) const
> {
> Acad::ErrorStatus es;
> AcDbVoidPtrArray ents;
> try
> {
> es = explode(ents); // just in case explode() failed but
> if( es != Acad::eOk ) // left entities in the array.
> throw es;
> for(int i = 0; i < ents.length(); i++)
> {
> AcDbEntity* pE = static_cast (ents);
> ASSERT(pE);
> es = pE->intersectWith(pEnt, intType, points,
> thisGsMarker, otherGsMarker);
> if( es != Acad::eOk && es != Acad::eNotImplemented )
> throw es; // anything else is regarded as an error
> }
> throw Acad::eOk;
> }
> catch(const Acad::ErrorStatus e)
> {
> for(int i = 0; i < ents.length(); i++)
> delete static_cast (ents);
> return e;
> }
> return Acad::eOk;
> }
>
>
>
> "Martin Schmid" wrote in message
> news:E3CD0B97ADBC18B2ECA34A0F78B1E22F@in.WebX.maYIadrTaRb...
> > Here is my explode function... I convert the Entity into a
> > AcDb3dPolyline(AcDb::k3dSimplePoly) (see below)
> >
> > Can you provide a simple example on how I would create the
insersectWith?
> I
> > am only concerned about my class (mjsduct) being able to insersect with
> > itself for now.
> >
> > In the documentation, it says:
> > "If the intersectWith() function of your custom entity is called with
> > another entity that is not a native entity, you need to explode your
> custom
> > entity (for example, by using the explode() function) to a set of
> > recognizable native entities, then turn around and call intersectWith()
on
> > the entity that came in as an argument to your intersectWith() function.
> > Because everyone is expected to be able to intersect with native
entities,
> > the entity in the argument would be able to intersect with your exploded
> > version."
> >
> > In my intersectWith(), how do I call explode() to get back
> > AcDb3dPolyline(AcDb::k3dSimplePoly), and how do I then "turn around and
> call
> > intersectWith()....."?
> >
> > Thanks,
> > MS
> >
> >
> > Acad::ErrorStatus mjsduct::explode(AcDbVoidPtrArray& entitySet) const
> > {
> > assertReadEnabled();
> >
> > AcGePoint3dArray PtArray;
> > AcGePoint3d sp;
> > AcGePoint3d ep;
> > AcGePoint3d p1, p2, p3, p4;
> > AcGeVector3d vec, axis;
> > double wd;
> > AcGePoint3d PlinePts[5];
> >
> > sp=getDuctStartPoint();
> > ep=getDuctEndPoint();
> > wd=getDuctWidth();
> >
> > vec.set(ep[0]-sp[0],ep[1]-sp[1],ep[2]-sp[2]);
> > axis=vec.perpVector();
> > axis.set(0.0,0.0,1.0);
> >
> > vec=vec.rotateBy(-pi/2.0,axis);
> > vec=vec.normalize();
> > p1=sp+vec*wd/2;
> > p2=ep+vec*wd/2;
> >
> > vec.rotateBy(pi,axis);
> > p3=ep+vec*wd/2;
> > p4=sp+vec*wd/2;
> >
> > PtArray.append(p1);
> > PtArray.append(p2);
> > PtArray.append(p3);
> > PtArray.append(p4);
> >
> > AcDb3dPolyline *pPoly=new
> > AcDb3dPolyline(AcDb::k3dSimplePoly,PtArray,Adesk::kTrue);
> > entitySet.append(pPoly);
> > return Acad::eOk;
> > }