日志
关于arx提取填充边界的问题
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提取填充图案边界线，从arx2008到2012都存在一个有趣的问题。
代码逻辑上暂时没发现有问题，但当填充图案是使用框选边界生成，含有两个以上的圆弧，形状如下图时，提取将会失败。
原因是代码中“AcDbArc *pArc = new AcDbArc(geCenter, dRadius, dStartAng, dEndAng)”的部分，当碰到这种情况，有可能有圆弧不能正确生成。
换成“AcDbArc *pArc = new AcDbArc(pGeArc ->center(), pGeArc->radius(), pGeArc->startAng(), pGeArc->endAng())”时也是不行。
只能变通点，按以下方式提取，在重塑边界时排除其中的悬挂线才能解决。
pArc = new AcDbArc(pGeArc->center(),pGeArc->normal(),pGeArc->radius(),pGeArc->startAng(),pGeArc->endAng());
pArc = new AcDbArc(pGeArc->center(),-pGeArc->normal(),pGeArc->radius(),-pGeArc->endAng(),-pGeArc->startAng());
圆弧构造函数也就那几个，按定义应该正确生成的，挺怪的。（补充：正确的实现见令一贴子）
原始代码粘贴如下：
//
// ObjectARX defined commands, created by Bill Zhang [2003-2-20], DevTech, Autodesk
#include "StdAfx.h"
#include "StdArx.h"
/////////////////////////////////////////////////////////////////////////////////////////
// A utility for regenerating the boundaries of a hatch entity if they are lost.
/////////////////////////////////////////////////////////////////////////////////////////
// append an entity to the current space of AutoCAD database
void addAEntToTheCurrentSpaceAndClose(AcDbEntity* pEnt)
{
AcDbBlockTableRecord *pBlkRec;
AcDbObjectId objID;
acdbOpenObject(pBlkRec, acdbCurDwg()->currentSpaceId(), AcDb::kForWrite);
pBlkRec->appendAcDbEntity (objID, pEnt) ;
pEnt->close();
pBlkRec->close();
}
//-----------------------------------------------------------------------------
// This is command 'RESTOREHATCHBOUNDARY, by Bill Zhang [2003-2-20], DevTech, Autodesk
void BzhRestoreHatchBoundary()
{
#ifdef OARXWIZDEBUG
acutPrintf ("\nOARXWIZDEBUG - BzhRestoreHatchBoundary() called.");
#endif // OARXWIZDEBUG
// TODO: Implement the command
// create a resbuf which is filled with filter conditions.
struct resbuf *filter = acutBuildList(RTDXF0, "HATCH", RTNONE);
ads_name ss;
// ask users to select hatch entities.
int res = acedSSGet(NULL, NULL, NULL, filter, ss);
// release filter resbuf.
acutRelRb (filter);
if( res != RTNORM )
{
acutPrintf("\nNo hatch entities selected!");
return;
}
long length=0l;
acedSSLength (ss, &length);
for(long indexSS=0l; indexSS<length; indexSS++)
{
ads_name eName;
res = acedSSName(ss, indexSS, eName);
if( res != RTNORM )
continue;
AcDbObjectId id;
acdbGetObjectId(id, eName );
AcDbHatch*pHatch=NULL;
acdbOpenObject(pHatch, id, AcDb::kForRead );
if( pHatch == NULL )
continue;
// For each loop, draw the boundary.
int nLoops = pHatch->numLoops();
for( int i=0;i<nLoops; i++ )
{
long loopType;
if( pHatch->loopTypeAt( i ) & AcDbHatch::kPolyline )
{
AcGePoint2dArray vertices;
AcGeDoubleArray bulges;
pHatch->getLoopAt( i, loopType, vertices, bulges );
int nVertices = vertices.length();
AcDbPolyline *pPoly = new AcDbPolyline(nVertices);
for( int vx=0;vx<nVertices;vx++ )
{
double bulge = bulges.length() < nVertices ? 0.0: bulges[vx];
pPoly->addVertexAt( vx, vertices[vx], bulge );
}
// append it to the current space of AutoCAD database
pPoly->setColorIndex(1);
addAEntToTheCurrentSpaceAndClose(pPoly);
}
else
{
AcGePoint2dArray vertices;
AcGeDoubleArray bulges;
AcGeVoidPointerArray edgePtrs;
AcGeIntArray edgeTypes;
pHatch->getLoopAt(i, loopType,edgePtrs, edgeTypes );
for(int j=0; j<edgePtrs.length(); j++)
{
switch (edgeTypes[j]){
case AcDbHatch::kLine:
{
AcGeLineSeg3d *pGeLine3d = (AcGeLineSeg3d*)edgePtrs[j];
AcGePoint3d geP1, geP2;
geP1 = pGeLine3d->startPoint();
geP2 = pGeLine3d->endPoint();
AcDbLine *pLine = new AcDbLine(geP1, geP2);
pLine->setColorIndex(1);
addAEntToTheCurrentSpaceAndClose(pLine);
}
break;
case AcDbHatch::kCirArc:
{
AcGePoint3d geCenter;
double dRadius, dStartAng, dEndAng;
AcGeCircArc3d *pGeArc = (AcGeCircArc3d*)edgePtrs[j];
geCenter = pGeArc->center();
dRadius = pGeArc->radius();
dStartAng = pGeArc->startAng();
dEndAng = pGeArc->endAng();
double dAngDiff;
dAngDiff = fabs( dEndAng - dStartAng - atan(1)*8 );
if( dAngDiff > 1e-5 ) // It's an ARC.
{
AcDbArc *pArc = new AcDbArc(geCenter, dRadius, dStartAng, dEndAng);
pArc->setColorIndex(1);
addAEntToTheCurrentSpaceAndClose(pArc);
}
else // It's a circle.
{
AcGeVector3d geNorm = pGeArc->normal();
AcDbCircle *pCir = new AcDbCircle(geCenter, geNorm, dRadius);
pCir->setColorIndex(1);
addAEntToTheCurrentSpaceAndClose(pCir);
}
}
break;
case AcDbHatch::kEllArc:
{
AcGePoint3d geCenter;
AcGeVector3d geNorm,dMajorAxis, dMinorAxis;
double dMajorRadius, dMinorRadius;
double dStartAng, dEndAng;
AcGeEllipArc3d *pGeEllip = (AcGeEllipArc3d*)edgePtrs[j];
geCenter = pGeEllip->center();
dStartAng = pGeEllip->startAng();
dEndAng = pGeEllip->endAng();
geNorm = pGeEllip->normal();
dMajorAxis = pGeEllip->majorAxis();
dMinorAxis = pGeEllip->minorAxis();
dMajorRadius = pGeEllip->majorRadius();
dMinorRadius = pGeEllip->minorRadius();
AcDbEllipse *pEllip = new AcDbEllipse();
// Note: radiusRatio = dMinorRadius/dMajorRadius (must be within [0, 1])
pEllip->set(geCenter,geNorm,dMajorAxis*dMajorRadius,dMinorRadius/dMajorRadius);
pEllip->setStartParam(dStartAng);
pEllip->setEndParam(dEndAng);
if( pEllip->isNull() == Adesk::kTrue)
{
acutPrintf("\nFailed to create an ellipse.");
break;
}
else
{
pEllip->setColorIndex(1);
addAEntToTheCurrentSpaceAndClose(pEllip);
}
}
break;
case AcDbHatch::kSpline:
{
Adesk::Boolean bIsFixSpline;
AcGePoint3dArray fitPoints;
AcGeTol fitTol;
Adesk::Boolean bTangentsExist;
AcGeVector3d startTangent, endTangent;
int deg;
AcGeNurbCurve3d *pGeSpline=(AcGeNurbCurve3d *)edgePtrs[j];
assert(pGeSpline);
deg = pGeSpline->degree();
bIsFixSpline = pGeSpline->getFitData(fitPoints,
fitTol,
bTangentsExist,
startTangent,
endTangent);
if( bIsFixSpline == Adesk::kTrue )
{
AcDbSpline *pSpline=new AcDbSpline();
pSpline->setFitData(fitPoints,
deg,
fitTol.equalVector(),
startTangent,
endTangent);
if( pSpline->isNull() == Adesk::kTrue)
{
acutPrintf("\nFailed to create a spline.");
break;
}
else
{
pSpline->setColorIndex(1);
addAEntToTheCurrentSpaceAndClose(pSpline);
}
}
else
{
Adesk::Boolean rational,closed,periodic;
AcGePoint3dArray gePoints;
AcGeDoubleArray geWeights;
AcGePoint3d gePoint;
AcGeKnotVector geKnots;
AcGeDoubleArray dKnots;
rational = pGeSpline->isRational();
closed = pGeSpline->isClosed();
periodic = Adesk::kFalse;
for(int k=0; k<pGeSpline->numControlPoints(); k++)
{
gePoints.append(pGeSpline->controlPointAt(k));
}
for(k=0; k<pGeSpline->numWeights(); k++)
{
geWeights.append(pGeSpline->weightAt(k));
}
geKnots = pGeSpline->knots();
for(k=0; k<geKnots.length(); k++)
{
dKnots.append(geKnots[k]);
}
AcDbSpline *pSpline=new AcDbSpline(deg,
rational,
closed,
periodic,
gePoints,
dKnots,
geWeights);
if( pSpline->isNull() == Adesk::kTrue)
{
acutPrintf("\nFailed to create a spline.");
break;
}
else
{
pSpline->setColorIndex(1);
addAEntToTheCurrentSpaceAndClose(pSpline);
}
}
}
break;
default:
break;
}
}
}
}
pHatch->close();
}
// free up the selection set
acedSSFree (ss);
}
