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// File: DsgPrs_ShapeDirPresentation.cxx
// Created: Fri Oct 6 12:33:19 1995
// Author: Jing Cheng MEI
// <mei@junon>
#include <DsgPrs_ShapeDirPresentation.ixx>
#include <gp.hxx>
#include <gp_Dir.hxx>
#include <Bnd_Box.hxx>
#include <Geom2d_Line.hxx>
#include <Geom_Curve.hxx>
#include <Geom_Surface.hxx>
#include <GeomLProp_CLProps.hxx>
#include <GeomLProp_SLProps.hxx>
#include <TopoDS_Shape.hxx>
#include <TopoDS.hxx>
#include <TopoDS_Face.hxx>
#include <TopLoc_Location.hxx>
#include <TopAbs_ShapeEnum.hxx>
#include <TopAbs_Orientation.hxx>
#include <TopExp_Explorer.hxx>
#include <TopTools_ListOfShape.hxx>
#include <BRep_Tool.hxx>
#include <BRepTools_WireExplorer.hxx>
//#include <BRepAdaptor_Curve2d.hxx>
#include <BRepClass_FaceClassifier.hxx>
#include <BRepClass_Edge.hxx>
#include <BRepBndLib.hxx>
#include <Graphic3d_Group.hxx>
#include <Graphic3d_Vertex.hxx>
#include <Graphic3d_Array1OfVertex.hxx>
#include <Prs3d_Arrow.hxx>
#include <Prs3d_LineAspect.hxx>
#include <Quantity_Length.hxx>
#include <TColgp_Array1OfPnt2d.hxx>
//=======================================================================
//function : FindPointOnFace
//purpose : internal use
//=======================================================================
static Standard_Boolean FindPointOnFace(const TopoDS_Face& face, gp_Pnt2d& pt2d)
{
// discredisation of the external contour and computing the center of gravity
TopExp_Explorer wireExp;
wireExp.Init(face, TopAbs_WIRE);
if (!wireExp.More()) {
return Standard_False;
}
Standard_Integer npoints, nptt = 21;
TColgp_Array1OfPnt2d points(1, nptt);
Standard_Real area=0., xcent=0., ycent=0.;
TopExp_Explorer edgeExp;
for (edgeExp.Init(wireExp.Current(), TopAbs_EDGE); edgeExp.More(); edgeExp.Next()) {
// discretize the 2d curve
Standard_Real first, last;
Handle(Geom2d_Curve) c2d = BRep_Tool::CurveOnSurface(TopoDS::Edge(edgeExp.Current()), face, first, last);
if (TopoDS::Edge(edgeExp.Current()).Orientation() == TopAbs_REVERSED) {
Standard_Real change = first;
first = last;
last = change;
}
if (c2d->DynamicType() == STANDARD_TYPE(Geom2d_Line)) {
npoints = 2;
c2d->D0(first, points(1));
c2d->D0(last, points(2));
}
else {
Standard_Real deltaT, t;
npoints = nptt;
deltaT = (last - first) / (nptt-1);
for (Standard_Integer i=1; i<=nptt; i++) {
if (i == 1) {
t = first;
}
else if (i == nptt) {
t = last;
}
else {
t = first + (i-1) * deltaT;
}
c2d->D0(t, points(i));
}
}
// compute the contribution to the center of gravity
Standard_Real h, c, d;
for (Standard_Integer i=1; i<=npoints-1; i++) {
h = 0.5*(points(i).Y() + points(i+1).Y());
c = points(i+1).X() - points(i).X();
d = points(i+1).X() + points(i).X();
area += h*c;
xcent += 0.5*h*c*d;
ycent += 0.5*h*h*c;
}
}
if (Abs(area) < gp::Resolution()) {
pt2d.SetCoord(points(1).X(), points(1).Y());
return Standard_False;
}
pt2d.SetCoord(xcent / area, ycent / area);
// verify that (upar vpar) is a point on the face
BRepClass_FaceClassifier fClass(face, pt2d, gp::Resolution());
if ((fClass.State() == TopAbs_OUT) || (fClass.State() == TopAbs_UNKNOWN)) {
// try to find a point on face
pt2d=points(1);
}
return Standard_True;
}
//=======================================================================
//function : ComputeDir
//purpose : internal use
//=======================================================================
static Standard_Boolean ComputeDir(const TopoDS_Shape& shape, gp_Pnt& pt, gp_Dir& dir, const Standard_Integer mode)
{
TopLoc_Location loc;
if (shape.ShapeType() == TopAbs_EDGE) {
Standard_Real first, last;
Handle(Geom_Curve) curv0 = BRep_Tool::Curve(TopoDS::Edge(shape), loc, first, last);
Handle(Geom_Curve) curve = Handle(Geom_Curve)::DownCast(curv0->Copy());
curve->Transform(loc.Transformation());
GeomLProp_CLProps lProps(curve, 1, gp::Resolution());
if (mode == 0) {
lProps.SetParameter(last);
}
else if (mode == 1) {
lProps.SetParameter(first);
}
if (!lProps.IsTangentDefined()) {
return Standard_False;
}
pt = lProps.Value();
lProps.Tangent(dir);
}
else if (shape.ShapeType() == TopAbs_FACE) {
gp_Pnt2d pt2d;
Handle(Geom_Surface) surface = BRep_Tool::Surface(TopoDS::Face(shape));
if (BRep_Tool::NaturalRestriction(TopoDS::Face(shape))) {
Standard_Real u1, u2, v1, v2;
surface->Bounds(u1, u2, v1, v2);
pt2d.SetCoord((u1+u2)*0.5, (v1+v2)*0.5);
}
else {
Standard_Boolean found = FindPointOnFace(TopoDS::Face(shape), pt2d);
if (!found) {
return Standard_False;
}
}
GeomLProp_SLProps lProps(surface, pt2d.X(), pt2d.Y(), 1, gp::Resolution());
if (!lProps.IsNormalDefined()) {
return Standard_False;
}
pt = lProps.Value();
dir = lProps.Normal();
}
if ((shape.Orientation() == TopAbs_FORWARD && mode == 1) ||
(shape.Orientation() == TopAbs_REVERSED && mode == 0)) {
dir.Reverse();
}
return Standard_True;
}
//=======================================================================
//function : Add
//purpose :
//=======================================================================
void DsgPrs_ShapeDirPresentation::Add(const Handle(Prs3d_Presentation)& prs,
const Handle(Prs3d_Drawer)& drawer,
const TopoDS_Shape& shape,
const Standard_Integer mode)
{
if ((mode != 0) && (mode != 1)) {
return;
}
gp_Dir dir;
gp_Pnt pt;
Bnd_Box box;
if (shape.ShapeType() == TopAbs_EDGE) {
ComputeDir(shape, pt, dir, mode);
BRepBndLib::Add(shape, box);
}
else if (shape.ShapeType() == TopAbs_FACE) {
ComputeDir(shape, pt, dir, mode);
BRepBndLib::Add(shape, box);
}
else if (shape.ShapeType() == TopAbs_WIRE) {
TopTools_ListOfShape aList;
Standard_Integer nb = 0;
BRepTools_WireExplorer anExp;
for (anExp.Init(TopoDS::Wire(shape)); anExp.More(); anExp.Next()) {
const TopoDS_Edge& edge = anExp.Current();
nb++;
if (nb <=3) {
BRepBndLib::Add(edge, box);
}
aList.Append(edge);
}
if (mode == 0) {
const TopoDS_Edge& edge = TopoDS::Edge(aList.Last());
ComputeDir(edge, pt, dir, mode);
}
else {
const TopoDS_Edge& edge = TopoDS::Edge(aList.First());
ComputeDir(edge, pt, dir, mode);
}
}
else {
TopExp_Explorer faceExp;
TopTools_ListOfShape aList;
Standard_Integer nb = 0;
for (faceExp.Init(shape, TopAbs_FACE); faceExp.More(); faceExp.Next()) {
nb++;
const TopoDS_Face& face = TopoDS::Face(faceExp.Current());
aList.Append(face);
BRepBndLib::Add(face, box);
if (nb > 3) break;
}
const TopoDS_Face& face = TopoDS::Face(aList.Last());
ComputeDir(face, pt, dir, mode);
}
Standard_Real c[6];
box.Get(c[0],c[1],c[2],c[3],c[4],c[5]);
gp_Pnt ptmin(c[0], c[1], c[2]), ptmax(c[3], c[4], c[5]);
Quantity_Length leng = ptmin.Distance(ptmax)/3.;
// mei 19/09/96 extrusion infinie -> taille fixe
if (leng >= 20000.) leng = 50;
gp_Pnt pt2(pt.X()+leng*dir.X(), pt.Y()+leng*dir.Y(), pt.Z()+leng*dir.Z());
Graphic3d_Array1OfVertex line(1,2);
line(1).SetCoord(pt.X(), pt.Y(), pt.Z());
line(2).SetCoord(pt2.X(), pt2.Y(), pt2.Z());
Prs3d_Root::CurrentGroup(prs)->SetPrimitivesAspect(drawer->LineAspect()->Aspect());
Prs3d_Root::CurrentGroup(prs)->Polyline(line);
Prs3d_Arrow::Draw(prs, pt2, dir, PI/180.*10., leng*0.3);
}
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