如何从AcDb2dPolyline对象中获取AcGeCurve3d对象？
如何获取与AcDb2dPolyline对象关联的AcGeCurve3d对象？例如，是否有一个名为“AcDb2dPolylineToAcGeCurve3d（AcDb2dPolyline*， AcGeCurve3d * & )"?
顺便说一下，我可以从其他类型的曲线（折线、圆、样条...）中获取AcGeCurve3d，但为此，我找不到方法。
**** Hidden Message ***** 如果可以从多段线获取AcGeCurve3d，并且AcDb2dPolyline很简单，则可以在AcDbPolyline：：convertFrom的帮助下将其转换为AcDbPolyline。如果AcDb2dPolyline不简单，可以尝试使用AcDbCurve:：getSpline方法将其转换为样条线。 没有了。
不知道。
怎么知道？你能提供一个代码样本吗？您总是可以使用AcDbPolyline::convertFrom函数将AcDb2dPolyline转换为AcDbPolyline，并从那里通过任何方式获得AcGeCurve3d对象。 好的，这是我的代码。
#definePI 3.14159265358979323846264338327950288
//转换AcDbCurve到AcGeCurve3d
//Function : Get AcGeCurve3d object associated with AcDbCurve (include : line,arc,circle,ellipse,spline,polyline...)
//Arguments: from : AcDbCurve , the AcDbCurbe object,to : AcGeCurve3d object
//return:Acad::ErrorStatus
Acad::ErrorStatus convertDbCurveToGeCurve(AcDbCurve *pDbCurve,AcGeCurve3d *&pGeCurve)
{
pGeCurve=NULL;
// for Line: is very simple;
if (pDbCurve->isKindOf(AcDbLine::desc()))
{
AcDbLine *pL=(AcDbLine *)pDbCurve;
AcGeLineSeg3d *pGL=new AcGeLineSeg3d;
pGL->set(pL->startPoint(),pL->endPoint());
pGeCurve=(AcGeCurve3d *)pGL;
}
// for Arc;
else if (pDbCurve->isKindOf(AcDbArc::desc()))
{
AcDbArc *pArc=(AcDbArc *)pDbCurve;
double ans,ane;
ans=pArc->startAngle();
ane=pArc->endAngle();
AcGeCircArc3d *pGArc=new AcGeCircArc3d;
pGArc->setCenter(pArc->center());
pGArc->setRadius(pArc->radius());
pGArc->setAngles(ans,ane);
pGeCurve=(AcGeCurve3d *)pGArc;
}
// for Circle;
else if (pDbCurve->isKindOf(AcDbCircle::desc()))
{
AcDbCircle *pCir=(AcDbCircle *)pDbCurve;
AcGeCircArc3d * pGCir=new AcGeCircArc3d;
pGCir->setCenter(pCir->center());
pGCir->setRadius(pCir->radius());
pGeCurve=(AcGeCurve3d *)pGCir;
}
//for Ellipse
else if (pDbCurve->isKindOf(AcDbEllipse::desc()))
{
AcDbEllipse *pEli=(AcDbEllipse *)pDbCurve;
AcGePoint3d center=pEli->center();
AcGeVector3d pv1 = pEli->majorAxis();
double majorRadius = sqrt(pv1.x*pv1.x+pv1.y*pv1.y+pv1.z*pv1.z);
double param1,param2;
pEli->getStartParam(param1);
pEli->getEndParam(param2);
AcGeEllipArc3d *pGEli=new AcGeEllipArc3d;
pGEli->setCenter(center);
pGEli->setAxes(pv1,pEli->minorAxis());
pGEli->setMajorRadius(majorRadius);
pGEli->setMinorRadius(majorRadius*(pEli->radiusRatio()));
pGEli->setAngles(param1,param2);
pGeCurve=(AcGeCurve3d *)pGEli;
}
//for Spline
else if (pDbCurve->isKindOf(AcDbSpline::desc()))
{
AcDbSpline *pSL=(AcDbSpline *)pDbCurve;
if (!pSL)
{
return Acad::eNotImplemented;
}
if (pSL->isNull()==Adesk::kTrue)
{
return Acad::eNotImplemented;
}
int degree;
Adesk::Boolean rational;
Adesk::Boolean closed;
Adesk::Boolean periodic;
AcGePoint3dArray controlPoints;
AcGeDoubleArray knots;
AcGeDoubleArray weights;
double controlPtTol;
double knotTol;
AcGeTol tol;
Acad::ErrorStatus es;
es=pSL->getNurbsData(degree,rational,closed,periodic,controlPoints,knots,weights,controlPtTol,knotTol);
if (es!=Acad::eOk)
{
return Acad::eNotImplemented;
}
if (rational==Adesk::kTrue)
{
AcGeNurbCurve3d *pNurb=new AcGeNurbCurve3d(degree,knots,controlPoints,weights,periodic);
pGeCurve=(AcGeCurve3d *)pNurb;
}
else
{
AcGeNurbCurve3d *pNurb=new AcGeNurbCurve3d(degree,knots,controlPoints,periodic);
pGeCurve=(AcGeCurve3d *)pNurb;
}
}
// for Polyline
else if (pDbCurve->isKindOf(AcDbPolyline::desc()))
{
AcDbPolyline *pPoly = (AcDbPolyline *)pDbCurve;
int nSegs;
AcGeLineSeg3d *pLine;
AcGeLineSeg3d line;
AcGeCircArc3d *pArc;
AcGeCircArc3d arc;
AcGeVoidPointerArray geCurves;
if (pPoly->isClosed())
{
nSegs = pPoly->numVerts();
}
else
{
nSegs = pPoly->numVerts() - 1;
}
for( int i = 0; i segType(i) == AcDbPolyline::kLine )
{
pPoly->getLineSegAt( i, line );
pLine = new AcGeLineSeg3d( line );
geCurves.append( pLine );
}
else if( pPoly->segType( i ) == AcDbPolyline::kArc )
{
pPoly->getArcSegAt( i, arc );
pArc = new AcGeCircArc3d( arc );
geCurves.append( pArc );
}
}
if( geCurves.length() == 1 )
{
pGeCurve = ( AcGeCurve3d* )( geCurves );
}
else
{
pGeCurve = new AcGeCompositeCurve3d( geCurves );
}
}
//else if (pDbCurve->isKindOf(AcDb2dPolyline::desc()))
//{
//}
return (pGeCurve)?Acad::eOk:Acad::eNotImplemented;
}
我没有完成关于AcDb2dPolyline的部分代码，我希望AcGeCurve3d对象完全来自AcDbCurve对象，而不是合适的对象。 是的，好的。继续处理转换过程。将AcDbPolyline:：convertFrom与AcDb2dPolyline一起使用，并称之为良好。 AcDbSpline的代码不是通用的（恕我直言）。查看： http://www.caduser.ru/forum/index.php?PAGE_NAME=message&FID=24&TID=22185&MID=125061#message125061 我有一个方法，如果AcDb2dPolyline不简单：
AcDbObjectIterator *pVertIter = NULL;
pVertIter=p2dPoly->vertexIterator();
AcDb2dVertex *pVertex = NULL;
AcDbObjectId vertId;
AcGePoint3d pt;
AcGePoint3dArray ptArray;
for(pVertIter->start();!pVertIter->done();pVertIter->step())
{
vertId = pVertIter->objectId();
acdbOpenObject(pVertex,vertId,AcDb::kForRead);
pt=pVertex->position();
ptArray.append(pt);
pVertex->close();
}
这样，我得到了点，所以我可以构造段，然后我可以构造AcGeCurve3d 它仅适用于不带凸出的＜strong＞简单＜AcDb2dPolyline。阅读有关AcDb2dPolyline:：polyType方法的信息。
我还是有点困惑，谢谢你，还有佩克胡特isKindOf(AcDbLine::desc())) ...
else if (pDbCurve->isKindOf(AcDbArc::desc())) ...
else if (pDbCurve->isKindOf(AcDbCircle::desc())) ...
else if (pGrass->isGreener(AcDbThatField::desc()))...
这种类型的代码不是必需的。 当你发现自己在做一堆 isKindOf 函数时，问问自己是否有更好的方法来编写代码。在你的情况下有。将它们中的每一个分解成自己的小函数，让C++函数重载来完成所有工作。代码将更易于维护且速度更快。
仅供参考，在AcDbPolyline的测试中，您为局部变量分配了一个返回的引用
AcGeVoidPointerArray geCurves; ... pGeCurve = ( AcGeCurve3d* )( geCurves );
当convertDbCurveToGeCurve超出范围时，geCurves也是如此。这些类型的错误可能很难追踪。
下面是使用函数重载对代码进行重构，它可能无法编译或工作，因为我刚刚重新组织了一下。
AcGeLineSeg3d * convertDbCurveToGeCurve3d(const AcDbLine * pLine)
{
AcGeLineSeg3d * pGL = new AcGeLineSeg3d;
pGL->set(pLine->startPoint(), pLine->endPoint());
return pGL;
}
AcGeCircArc3d * convertDbCurveToGeCurve3d(const AcDbArc * pArc)
{
// AcDbArc *pArc=(AcDbArc *)pDbCurve;
double ans,ane;
ans=pArc->startAngle();
ane=pArc->endAngle();
AcGeCircArc3d *pGArc=new AcGeCircArc3d;
pGArc->setCenter(pArc->center());
pGArc->setRadius(pArc->radius());
pGArc->setAngles(ans,ane);
return pGArc;
}
AcGeCurve3d * Acad::ErrorStatus convertDbCurveToGeCurve3d(const AcDbCircle * pCircle)
{
AcGeCircArc3d * pGCir=new AcGeCircArc3d;
pGCir->setCenter(pCir->center());
pGCir->setRadius(pCir->radius());
return pGCir;
}
AcGeEllipArc3d * Acad::ErrorStatus convertDbCurveToGeCurve3d(const AcDbEllipArc3d * pEli)
{
AcGePoint3d center=pEli->center();
AcGeVector3d pv1 = pEli->majorAxis();
double majorRadius = sqrt(pv1.x*pv1.x+pv1.y*pv1.y+pv1.z*pv1.z);
double param1,param2;
pEli->getStartParam(param1);
pEli->getEndParam(param2);
AcGeEllipArc3d *pGEli=new AcGeEllipArc3d;
pGEli->setCenter(center);
pGEli->setAxes(pv1,pEli->minorAxis());
pGEli->setMajorRadius(majorRadius);
pGEli->setMinorRadius(majorRadius*(pEli->radiusRatio()));
pGEli->setAngles(param1,param2);
return pGEli;
}
AcGeNurbCurve3d * Acad::ErrorStatus convertDbCurveToGeCurve3d(const AcDbSpline * pSL)
{
int degree;
Adesk::Boolean rational;
Adesk::Boolean closed;
Adesk::Boolean periodic;
AcGePoint3dArray controlPoints;
AcGeDoubleArray knots;
AcGeDoubleArray weights;
double controlPtTol;
double knotTol;
AcGeTol tol;
Acad::ErrorStatus es;
es=pSL->getNurbsData(degree,rational,closed,periodic,controlPoints,knots,weights,controlPtTol,knotTol);
if (es!=Acad::eOk)
{
return NULL;
}
AcGeNurbeCurve3d * pNurb = NULL;
if (rational==Adesk::kTrue)
{
pNurb=new AcGeNurbCurve3d(degree,knots,controlPoints,weights,periodic);
}
else
{
pNurb=new AcGeNurbCurve3d(degree,knots,controlPoints,periodic);
}
return pNurb;
}
AcGeCompositeCurve3d * Acad::ErrorStatus convertDbCurveToGeCurve3d(const AcDbPolyline * pPoly)
{
int nSegs;
AcGeLineSeg3d *pLine;
AcGeLineSeg3d line;
AcGeCircArc3d *pArc;
AcGeCircArc3d arc;
AcGeVoidPointerArray * geCurves = new AcGeVoidPointerArray;
if (pPoly->isClosed())
{
nSegs = pPoly->numVerts();
}
else
{
nSegs = pPoly->numVerts() - 1;
}
for( int i = 0; i segType(i) == AcDbPolyline::kLine )
{
pPoly->getLineSegAt( i, line );
pLine = new AcGeLineSeg3d( line );
geCurves->append( pLine );
}
else if( pPoly->segType( i ) == AcDbPolyline::kArc )
{
pPoly->getArcSegAt( i, arc );
pArc = new AcGeCircArc3d( arc );
geCurves->append( pArc );
}
}
if(geCurves.IsEmpty()) {
delete pGeCurves;
return NULL;
}
return new AcGeCompositeCurve3d( geCurves );
}
AcGeEntity3d * convertDbCurveToGeCurve3d(const AcDbCurve *pDbCurve)
{
// catch all for all other entity types.
return NULL;
}
非常感谢，pkohut，太棒了！重载！万分感谢。
当2dPolyline是“k2dQuadSplinePoly”或“k2dCubicSplinePoly”时，我认为我的方法是正确的。我正在验证它。
页:
[1]
2