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// File: IntCurveSurface_CurveTool.gxx
// Created: Mon Jul 17 17:39:39 1995
// Author: Modelistation
// <model@mastox>
#include CurveGen_hxx
#include <GeomAbs_CurveType.hxx>
#include <GeomAbs_Shape.hxx>
#include <Handle_Geom_BezierCurve.hxx>
#include <Handle_Geom_BSplineCurve.hxx>
#include <TColStd_Array1OfReal.hxx>
#include <TColStd_Array1OfBoolean.hxx>
#include <gce_MakeLin.hxx>
#include <gp_Pnt.hxx>
#include <gp_Lin.hxx>
#define myMinPnts 5
//============================================================
Standard_Integer IntCurveSurface_HCurveTool::NbSamples (const CurveGen& C,
const Standard_Real U0,
const Standard_Real U1) {
GeomAbs_CurveType typC = C->GetType();
static Standard_Real nbsOther = 10.0;
Standard_Real nbs = nbsOther;
if(typC == GeomAbs_Line)
nbs = 2;
else if(typC == GeomAbs_BezierCurve)
nbs = 3 + C->NbPoles();
else if(typC == GeomAbs_BSplineCurve) {
nbs = C->NbKnots();
nbs*= C->Degree();
nbs*= C->LastParameter()- C->FirstParameter();
nbs/= U1-U0;
if(nbs < 2.0) nbs=2;
}
if(nbs>50)
nbs = 50;
return((Standard_Integer)nbs);
}
//============================================================
void IntCurveSurface_HCurveTool::SamplePars (const CurveGen& C,
const Standard_Real U0,
const Standard_Real U1,
const Standard_Real Defl,
const Standard_Integer NbMin,
Handle(TColStd_HArray1OfReal)& Pars) {
GeomAbs_CurveType typC = C->GetType();
static Standard_Real nbsOther = 10.0;
Standard_Real nbs = nbsOther;
if(typC == GeomAbs_Line)
nbs = 2;
else if(typC == GeomAbs_BezierCurve) {
nbs = 3 + C->NbPoles();
}
if(typC != GeomAbs_BSplineCurve) {
if(nbs>50)
nbs = 50;
Standard_Integer nnbs = (Standard_Integer)nbs;
Pars = new TColStd_HArray1OfReal(1, nnbs);
Standard_Real du = (U1-U0)/(nnbs - 1);
Pars->SetValue(1, U0);
Pars->SetValue(nnbs, U1);
Standard_Integer i;
Standard_Real u;
for(i = 2, u = U0+du; i < nnbs; ++i, u += du) {
Pars->SetValue(i, u);
}
return;
}
const Handle(Geom_BSplineCurve)& aBC = C->BSpline();
Standard_Integer i, j, k, nbi;
Standard_Real t1, t2, dt;
Standard_Integer ui1 = aBC->FirstUKnotIndex();
Standard_Integer ui2 = aBC->LastUKnotIndex();
for(i = ui1; i < ui2; ++i) {
if(U0 >= aBC->Knot(i) && U0 < aBC->Knot(i+1)) {
ui1 = i;
break;
}
}
for(i = ui2; i > ui1; --i) {
if(U1 <= aBC->Knot(i) && U1 > aBC->Knot(i-1)) {
ui2 = i;
break;
}
}
Standard_Integer nbsu = ui2-ui1+1; nbsu += (nbsu - 1) * (aBC->Degree()-1);
Standard_Boolean bUniform = Standard_False;
if(nbsu < NbMin) {
nbsu = NbMin;
bUniform = Standard_True;
}
TColStd_Array1OfReal aPars(1, nbsu);
TColStd_Array1OfBoolean aFlg(1, nbsu);
//Filling of sample parameters
if(bUniform) {
t1 = U0;
t2 = U1;
dt = (t2 - t1)/(nbsu - 1);
aPars(1) = t1;
aFlg(1) = Standard_False;
aPars(nbsu) = t2;
aFlg(nbsu) = Standard_False;
for(i = 2, t1 += dt; i < nbsu; ++i, t1 += dt) {
aPars(i) = t1;
aFlg(i) = Standard_False;
}
}
else {
nbi = aBC->Degree();
k = 0;
t1 = U0;
for(i = ui1+1; i <= ui2; ++i) {
if(i == ui2) t2 = U1;
else t2 = aBC->Knot(i);
dt = (t2 - t1)/nbi;
j = 1;
do {
++k;
aPars(k) = t1;
aFlg(k) = Standard_False;
t1 += dt;
}
while (++j <= nbi);
t1 = t2;
}
++k;
aPars(k) = t1;
}
//Analysis of deflection
Standard_Real aDefl2 = Max(Defl*Defl, 1.e-9);
Standard_Real tol = Max(0.01*aDefl2, 1.e-9);
Standard_Integer l;
Standard_Integer NbSamples = 2;
aFlg(1) = Standard_True;
aFlg(nbsu) = Standard_True;
j = 1;
Standard_Boolean bCont = Standard_True;
while (j < nbsu-1 && bCont) {
if(aFlg(j+1)) {
++j;
continue;
}
t2 = aPars(j);
gp_Pnt p1 = aBC->Value(t2);
for(k = j+2; k <= nbsu; ++k) {
t2 = aPars(k);
gp_Pnt p2 = aBC->Value(t2);
if(p1.SquareDistance(p2) <= tol) continue;
gce_MakeLin MkLin(p1, p2);
const gp_Lin& lin = MkLin.Value();
Standard_Boolean ok = Standard_True;
for(l = j+1; l < k; ++l) {
if(aFlg(l)) {
ok = Standard_False;
break;
}
gp_Pnt pp = aBC->Value(aPars(l));
Standard_Real d = lin.SquareDistance(pp);
if(d <= aDefl2) continue;
ok = Standard_False;
break;
}
if(!ok) {
j = k - 1;
aFlg(j) = Standard_True;
++NbSamples;
break;
}
if(aFlg(k)) {
j = k;
break;
}
}
if(k >= nbsu) bCont = Standard_False;
}
if(NbSamples < myMinPnts) {
//uniform distribution
NbSamples = myMinPnts;
Pars = new TColStd_HArray1OfReal(1, NbSamples);
t1 = U0;
t2 = U1;
dt = (t2 - t1)/(NbSamples - 1);
Pars->SetValue(1, t1);
Pars->SetValue(NbSamples, t2);
for(i = 2, t1 += dt; i < NbSamples; ++i, t1 += dt) {
Pars->SetValue(i, t1);
}
return;
}
Pars = new TColStd_HArray1OfReal(1, NbSamples);
j = 0;
for(i = 1; i <= nbsu; ++i) {
if(aFlg(i)) {
++j;
Pars->SetValue(j,aPars(i));
}
}
}
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