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// File: BRepBuilderAPI_FindPlane.cxx
// Created: Thu Nov 2 11:47:55 1995
// Author: Jing Cheng MEI
// <mei@junon>
#include <BRepBuilderAPI_FindPlane.ixx>
#include <Precision.hxx>
#include <gp_Dir.hxx>
#include <gp_Vec.hxx>
#include <gp_Pln.hxx>
#include <TColgp_SequenceOfPnt.hxx>
#include <TopoDS.hxx>
#include <TopLoc_Location.hxx>
#include <TopExp_Explorer.hxx>
#include <BRep_Tool.hxx>
#include <Geom_Line.hxx>
#include <Geom_Conic.hxx>
#include <Geom_Circle.hxx>
#include <Geom_Ellipse.hxx>
#include <Geom_Parabola.hxx>
#include <Geom_Hyperbola.hxx>
#include <Geom_BezierCurve.hxx>
#include <Geom_BSplineCurve.hxx>
//=======================================================================
//function : BRepBuilderAPI_FindPlane
//purpose :
//=======================================================================
BRepBuilderAPI_FindPlane::BRepBuilderAPI_FindPlane()
{
}
//=======================================================================
//function : BRepBuilderAPI_FindPlane
//purpose :
//=======================================================================
BRepBuilderAPI_FindPlane::BRepBuilderAPI_FindPlane(const TopoDS_Shape& S,
const Standard_Real Tol)
{
Init(S,Tol);
}
//=======================================================================
//function : Init
//purpose :
//=======================================================================
void BRepBuilderAPI_FindPlane::Init(const TopoDS_Shape& S,
const Standard_Real Tol)
{
Standard_Real tolerance = Tol;
myPlane.Nullify();
// compute the tolerance
TopExp_Explorer ex;
for (ex.Init(S,TopAbs_EDGE); ex.More(); ex.Next()) {
Standard_Real t = BRep_Tool::Tolerance(TopoDS::Edge(ex.Current()));
if (t > tolerance) tolerance = t;
}
Standard_Real tol2 = tolerance*tolerance;
// try to find an analytical curve and calculate points
TopLoc_Location loc;
Standard_Real first, last;
Standard_Boolean found = Standard_False;
Handle(Geom_Plane) P;
TColgp_SequenceOfPnt points;
Standard_Integer nbPnts;
for (ex.Init(S,TopAbs_EDGE); ex.More(); ex.Next()) {
Handle(Geom_Curve) c3d =
BRep_Tool::Curve(TopoDS::Edge(ex.Current()), loc, first, last);
if (!c3d.IsNull()) {
Handle(Geom_Curve) c3dptr =
Handle(Geom_Curve)::DownCast(c3d->Transformed(loc.Transformation()));
Handle(Standard_Type) cType = c3dptr->DynamicType();
if (cType == STANDARD_TYPE(Geom_Line)) {
nbPnts = 3;
}
else if ((cType == STANDARD_TYPE(Geom_Circle)) ||
(cType == STANDARD_TYPE(Geom_Ellipse)) ||
(cType == STANDARD_TYPE(Geom_Parabola)) ||
(cType == STANDARD_TYPE(Geom_Hyperbola))) {
nbPnts = 4;
if (!found) {
found = Standard_True;
Handle(Geom_Conic) Co = Handle(Geom_Conic)::DownCast(c3dptr);
P = new Geom_Plane(gp_Ax3(Co->Position()));
}
}
else if (cType == STANDARD_TYPE(Geom_BezierCurve)) {
Handle(Geom_BezierCurve) Co =
Handle(Geom_BezierCurve)::DownCast(c3dptr);
nbPnts = Co->NbPoles();
}
else if (cType == STANDARD_TYPE(Geom_BSplineCurve)) {
Handle(Geom_BSplineCurve) Co =
Handle(Geom_BSplineCurve)::DownCast(c3dptr);
nbPnts = Co->NbPoles();
}
else {
nbPnts = 10;
}
gp_Pnt p0;
for (Standard_Integer i=1; i<=nbPnts; i++) {
if (i == 1) {
c3dptr->D0(first, p0);
}
else if (i == nbPnts) {
c3dptr->D0(last, p0);
}
else {
c3dptr->D0(first+(last-first)/(nbPnts-1)*(i-1), p0);
}
points.Append(p0);
}
}
}
if (!found) {
// try to find a plane with the points
if (points.Length() > 2) {
Standard_Real disMax = 0.0;
gp_Pnt p0 = points(1);
gp_Pnt p1;
for (Standard_Integer i=2; i<=points.Length(); i++) {
Standard_Real dist = p0.SquareDistance(points(i));
if (dist > disMax) {
disMax = dist;
p1 = points(i); // ca va plus vite de stocker le point, sinon il faut chercher une valeur dans une sequence
}
}
if (disMax > tol2) {
gp_Vec V1(p0, p1), V3;
Standard_Real proMax = 0.0;
gp_Pnt p2 = p0 ;
for (Standard_Integer j=2; j<=points.Length(); j++) {
V3 = V1^gp_Vec(p0, points(j));
Standard_Real pro = V3.SquareMagnitude();
if (pro > proMax) {
proMax = pro;
p2 = points(j);
}
}
if (p0.SquareDistance(p2) > tol2) {
gp_Dir D1(V1), D2(gp_Vec(p0, p2));
if (!D1.IsParallel(D2, Precision::Angular())) {
P = new Geom_Plane(gp_Ax3(p0, D1.Crossed(D2), D1));
found = Standard_True;
}
}
}
}
}
if (found) {
// test if all points are on the plane
const gp_Pln& pln = P->Pln();
for (Standard_Integer i=1; i<=points.Length(); i++) {
if (pln.SquareDistance(points(i)) > tol2) {
found = Standard_False;
break;
}
}
}
if (found) {
myPlane = P;
}
}
//=======================================================================
//function : Found
//purpose :
//=======================================================================
Standard_Boolean BRepBuilderAPI_FindPlane::Found() const
{
return !myPlane.IsNull();
}
//=======================================================================
//function : Plane
//purpose :
//=======================================================================
Handle(Geom_Plane) BRepBuilderAPI_FindPlane::Plane() const
{
return myPlane;
}
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