-// Copyright (C) 2007-2012 CEA/DEN, EDF R&D, OPEN CASCADE
+// Copyright (C) 2007-2013 CEA/DEN, EDF R&D, OPEN CASCADE
//
// Copyright (C) 2003-2007 OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
// CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
const double a14divPI = 14. / M_PI;
+
inline double segLength(double S0, double edgeLen, double minLen )
{
// PAL10237
// S = S0 * f(L/Lmin) where f(x) = 1 + (2/Pi * 7 * atan(x/5) )
+
// =>
// S = S0 * ( 1 + 14/PI * atan( L / ( 5 * Lmin )))
return S0 * ( 1. + a14divPI * atan( edgeLen / ( 5 * minLen )));
}
+#if 0
+ //const double a14divPI = 14. / M_PI;
+ const double a2div7divPI = 2. / 7. / M_PI;
+ inline double segLength(double S0, double edgeLen, double minLen )
+ {
+ // PAL10237
+ // S = S0 * f(L/Lmin) where
+ // f(x) = 1 + (7 * 2/Pi * atan(x/5))
+ // =>
+ // S = S0 * ( 1 + 14/PI * atan( L / ( 5 * Lmin )))
+ //
+ // return S0 * ( 1. + a14divPI * atan( edgeLen / ( 5 * minLen )));
+
+ // The above formular gives too short segments when Lmax/Lmin is too high
+ // because by this formular the largest segment is only 8 times longer than the
+ // shortest one ( 2/Pi * atan(x/5) varies within [0,1] ). So a new formular is:
+ //
+ // f(x) = 1 + (x/7 * 2/Pi * atan(x/5))
+ // =>
+ // S = S0 * ( 1 + 2/7/PI * L/Lmin * atan( 5 * L/Lmin ))
+ //
+ const double Lratio = edgeLen / minLen;
+ return S0 * ( 1. + a2div7divPI * Lratio * atan( 5 * Lratio ));
+ }
+#endif
//================================================================================
/*!
* \brief Compute segment length for all edges
theTShapeToLengthMap.insert( make_pair( getTShape( edge ), L ));
}
- // Compute S0
-
- // image attached to PAL10237
-
- // NbSeg
- // ^
- // |
- // 10|\
- // | \
- // | \
- // | \
- // 5| --------
- // |
- // +------------>
- // 1 10 Lmax/Lmin
-
+ // Compute S0 - minimal segement length, is computed by the shortest EDGE
+
+ /* image attached to PAL10237
+
+ NbSeg (on the shortest EDGE)
+ ^
+ |
+ 10|\
+ | \
+ | \
+ | \
+ 5| --------
+ |
+ +------------>
+ 1 10 Lmax/Lmin
+ */
const int NbSegMin = 5, NbSegMax = 10; // on axis NbSeg
const double Lrat1 = 1., Lrat2 = 10.; // on axis Lmax/Lmin
MESSAGE( "S0 = " << S0 << ", Lmin = " << Lmin << ", Nbseg = " << (int) NbSeg);
// Compute segments length for all edges
+
map<const TopoDS_TShape*, double>::iterator tshape_length = theTShapeToLengthMap.begin();
for ( ; tshape_length != theTShapeToLengthMap.end(); ++tshape_length )
{