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FreeCAD/src/Mod/PartDesign/App/FeatureSketchBased.cpp

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/***************************************************************************
* Copyright (c) 2010 Juergen Riegel <FreeCAD@juergen-riegel.net> *
* *
* This file is part of the FreeCAD CAx development system. *
* *
* This library is free software; you can redistribute it and/or *
* modify it under the terms of the GNU Library General Public *
* License as published by the Free Software Foundation; either *
* version 2 of the License, or (at your option) any later version. *
* *
* This library is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU Library General Public License for more details. *
* *
* You should have received a copy of the GNU Library General Public *
* License along with this library; see the file COPYING.LIB. If not, *
* write to the Free Software Foundation, Inc., 59 Temple Place, *
* Suite 330, Boston, MA 02111-1307, USA *
* *
***************************************************************************/
#include "PreCompiled.h"
#ifndef _PreComp_
# include <Bnd_Box.hxx>
# include <BRep_Builder.hxx>
# include <BRepBndLib.hxx>
# include <BRepBuilderAPI_Copy.hxx>
# include <BRepBuilderAPI_MakeFace.hxx>
# include <BRepAdaptor_Surface.hxx>
# include <BRepCheck_Analyzer.hxx>
# include <BRep_Tool.hxx>
# include <BRepExtrema_DistShapeShape.hxx>
# include <BRepPrimAPI_MakePrism.hxx>
# include <BRepProj_Projection.hxx>
# include <Geom_Plane.hxx>
# include <TopoDS.hxx>
# include <TopoDS_Compound.hxx>
# include <TopoDS_Face.hxx>
# include <TopoDS_Wire.hxx>
# include <TopoDS_Vertex.hxx>
# include <TopExp_Explorer.hxx>
# include <gp_Ax1.hxx>
# include <gp_Pln.hxx>
# include <ShapeFix_Face.hxx>
# include <ShapeFix_Wire.hxx>
# include <ShapeAnalysis.hxx>
# include <TopTools_IndexedMapOfShape.hxx>
# include <TopExp.hxx>
# include <IntTools_FClass2d.hxx>
# include <ShapeAnalysis_Surface.hxx>
# include <ShapeFix_Shape.hxx>
#endif
#include "FeatureSketchBased.h"
#include <Mod/Part/App/Part2DObject.h>
using namespace PartDesign;
namespace PartDesign {
// sort bounding boxes according to diagonal length
struct Wire_Compare {
bool operator() (const TopoDS_Wire& w1, const TopoDS_Wire& w2)
{
Bnd_Box box1, box2;
BRepBndLib::Add(w1, box1);
box1.SetGap(0.0);
BRepBndLib::Add(w2, box2);
box2.SetGap(0.0);
return box1.SquareExtent() < box2.SquareExtent();
}
};
PROPERTY_SOURCE(PartDesign::SketchBased, PartDesign::Feature)
SketchBased::SketchBased()
{
ADD_PROPERTY(Sketch,(0));
ADD_PROPERTY_TYPE(Midplane,(0),"SketchBased", App::Prop_None, "Extrude symmetric to sketch face");
ADD_PROPERTY_TYPE(Reversed, (0),"SketchBased", App::Prop_None, "Reverse extrusion direction");
}
short SketchBased::mustExecute() const
{
if (Sketch.isTouched() ||
Midplane.isTouched() ||
Reversed.isTouched())
return 1;
return 0; // PartDesign::Feature::mustExecute();
}
void SketchBased::positionBySketch(void)
{
Part::Part2DObject *sketch = static_cast<Part::Part2DObject*>(Sketch.getValue());
if (sketch && sketch->getTypeId().isDerivedFrom(Part::Part2DObject::getClassTypeId())) {
Part::Feature *part = static_cast<Part::Feature*>(sketch->Support.getValue());
if (part && part->getTypeId().isDerivedFrom(Part::Feature::getClassTypeId()))
this->Placement.setValue(part->Placement.getValue());
else
this->Placement.setValue(sketch->Placement.getValue());
}
}
Part::Part2DObject* SketchBased::getVerifiedSketch() const {
App::DocumentObject* result = Sketch.getValue();
if (!result)
throw Base::Exception("No sketch linked");
if (!result->getTypeId().isDerivedFrom(Part::Part2DObject::getClassTypeId()))
throw Base::Exception("Linked object is not a Sketch or Part2DObject");
return static_cast<Part::Part2DObject*>(result);
}
std::vector<TopoDS_Wire> SketchBased::getSketchWires() const {
std::vector<TopoDS_Wire> result;
TopoDS_Shape shape = getVerifiedSketch()->Shape.getShape()._Shape;
if (shape.IsNull())
throw Base::Exception("Linked shape object is empty");
// this is a workaround for an obscure OCC bug which leads to empty tessellations
// for some faces. Making an explicit copy of the linked shape seems to fix it.
// The error almost happens when re-computing the shape but sometimes also for the
// first time
BRepBuilderAPI_Copy copy(shape);
shape = copy.Shape();
if (shape.IsNull())
throw Base::Exception("Linked shape object is empty");
TopExp_Explorer ex;
for (ex.Init(shape, TopAbs_WIRE); ex.More(); ex.Next()) {
result.push_back(TopoDS::Wire(ex.Current()));
}
if (result.empty()) // there can be several wires
throw Base::Exception("Linked shape object is not a wire");
return result;
}
// TODO: This code is taken from and duplicates code in Part2DObject::positionBySupport()
// Note: We cannot return a reference, because it will become Null.
// Not clear where, because we check for IsNull() here, but as soon as it is passed out of
// this method, it becomes null!
const TopoDS_Face SketchBased::getSupportFace() const {
const App::PropertyLinkSub& Support = static_cast<Part::Part2DObject*>(Sketch.getValue())->Support;
Part::Feature *part = static_cast<Part::Feature*>(Support.getValue());
if (!part || !part->getTypeId().isDerivedFrom(Part::Feature::getClassTypeId()))
throw Base::Exception("Sketch has no support shape");
const std::vector<std::string> &sub = Support.getSubValues();
assert(sub.size()==1);
// get the selected sub shape (a Face)
const Part::TopoShape &shape = part->Shape.getShape();
if (shape._Shape.IsNull())
throw Base::Exception("Sketch support shape is empty!");
TopoDS_Shape sh = shape.getSubShape(sub[0].c_str());
if (sh.IsNull())
throw Base::Exception("Null shape in SketchBased::getSupportFace()!");
const TopoDS_Face face = TopoDS::Face(sh);
if (face.IsNull())
throw Base::Exception("Null face in SketchBased::getSupportFace()!");
BRepAdaptor_Surface adapt(face);
if (adapt.GetType() != GeomAbs_Plane)
throw Base::Exception("No planar face in SketchBased::getSupportFace()!");
return face;
}
Part::Feature* SketchBased::getSupport() const {
// get the support of the Sketch if any
App::DocumentObject* SupportLink = static_cast<Part::Part2DObject*>(Sketch.getValue())->Support.getValue();
Part::Feature* SupportObject = NULL;
if (SupportLink && SupportLink->getTypeId().isDerivedFrom(Part::Feature::getClassTypeId()))
SupportObject = static_cast<Part::Feature*>(SupportLink);
return SupportObject;
}
const TopoDS_Shape& SketchBased::getSupportShape() const {
Part::Feature* SupportObject = getSupport();
if (SupportObject == NULL)
throw Base::Exception("No support in Sketch!");
const TopoDS_Shape& result = SupportObject->Shape.getValue();
if (result.IsNull())
throw Base::Exception("Support shape is invalid");
TopExp_Explorer xp (result, TopAbs_SOLID);
if (!xp.More())
throw Base::Exception("Support shape is not a solid");
return result;
}
int SketchBased::getSketchAxisCount(void) const
{
Part::Part2DObject *sketch = static_cast<Part::Part2DObject*>(Sketch.getValue());
return sketch->getAxisCount();
}
void SketchBased::onChanged(const App::Property* prop)
{
if (prop == &Sketch) {
// if attached to a sketch then mark it as read-only
this->Placement.StatusBits.set(2, Sketch.getValue() != 0);
}
Feature::onChanged(prop);
}
bool SketchBased::isInside(const TopoDS_Wire& wire1, const TopoDS_Wire& wire2) const
{
Bnd_Box box1;
BRepBndLib::Add(wire1, box1);
box1.SetGap(0.0);
Bnd_Box box2;
BRepBndLib::Add(wire2, box2);
box2.SetGap(0.0);
if (box1.IsOut(box2))
return false;
double prec = Precision::Confusion();
BRepBuilderAPI_MakeFace mkFace(wire1);
TopoDS_Face face = validateFace(mkFace.Face());
BRepAdaptor_Surface adapt(face);
IntTools_FClass2d class2d(face, prec);
Handle_Geom_Surface surf = new Geom_Plane(adapt.Plane());
ShapeAnalysis_Surface as(surf);
TopExp_Explorer xp(wire2,TopAbs_VERTEX);
while (xp.More()) {
TopoDS_Vertex v = TopoDS::Vertex(xp.Current());
gp_Pnt p = BRep_Tool::Pnt(v);
gp_Pnt2d uv = as.ValueOfUV(p, prec);
if (class2d.Perform(uv) == TopAbs_IN)
return true;
// TODO: We can make a check to see if all points are inside or all outside
// because otherwise we have some intersections which is not allowed
else
return false;
xp.Next();
}
return false;
}
TopoDS_Face SketchBased::validateFace(const TopoDS_Face& face) const
{
BRepCheck_Analyzer aChecker(face);
if (!aChecker.IsValid()) {
TopoDS_Wire outerwire = ShapeAnalysis::OuterWire(face);
TopTools_IndexedMapOfShape myMap;
myMap.Add(outerwire);
TopExp_Explorer xp(face,TopAbs_WIRE);
ShapeFix_Wire fix;
fix.SetFace(face);
fix.Load(outerwire);
fix.Perform();
BRepBuilderAPI_MakeFace mkFace(fix.WireAPIMake());
while (xp.More()) {
if (!myMap.Contains(xp.Current())) {
fix.Load(TopoDS::Wire(xp.Current()));
fix.Perform();
mkFace.Add(fix.WireAPIMake());
}
xp.Next();
}
aChecker.Init(mkFace.Face());
if (!aChecker.IsValid()) {
ShapeFix_Shape fix(mkFace.Face());
fix.SetPrecision(Precision::Confusion());
fix.SetMaxTolerance(Precision::Confusion());
fix.SetMaxTolerance(Precision::Confusion());
fix.Perform();
fix.FixWireTool()->Perform();
fix.FixFaceTool()->Perform();
return TopoDS::Face(fix.Shape());
}
return mkFace.Face();
}
return face;
}
TopoDS_Shape SketchBased::makeFace(std::list<TopoDS_Wire>& wires) const
{
BRepBuilderAPI_MakeFace mkFace(wires.front());
const TopoDS_Face& face = mkFace.Face();
if (face.IsNull())
return face;
gp_Dir axis(0,0,1);
BRepAdaptor_Surface adapt(face);
if (adapt.GetType() == GeomAbs_Plane) {
axis = adapt.Plane().Axis().Direction();
}
wires.pop_front();
for (std::list<TopoDS_Wire>::iterator it = wires.begin(); it != wires.end(); ++it) {
BRepBuilderAPI_MakeFace mkInnerFace(*it);
const TopoDS_Face& inner_face = mkInnerFace.Face();
if (inner_face.IsNull())
return inner_face; // failure
gp_Dir inner_axis(0,0,1);
BRepAdaptor_Surface adapt(inner_face);
if (adapt.GetType() == GeomAbs_Plane) {
inner_axis = adapt.Plane().Axis().Direction();
}
// It seems that orientation is always 'Forward' and we only have to reverse
// if the underlying plane have opposite normals.
if (axis.Dot(inner_axis) < 0)
it->Reverse();
mkFace.Add(*it);
}
return validateFace(mkFace.Face());
}
TopoDS_Shape SketchBased::makeFace(const std::vector<TopoDS_Wire>& w) const
{
if (w.empty())
return TopoDS_Shape();
//FIXME: Need a safe method to sort wire that the outermost one comes last
// Currently it's done with the diagonal lengths of the bounding boxes
std::vector<TopoDS_Wire> wires = w;
std::sort(wires.begin(), wires.end(), Wire_Compare());
std::list<TopoDS_Wire> wire_list;
wire_list.insert(wire_list.begin(), wires.rbegin(), wires.rend());
// separate the wires into several independent faces
std::list< std::list<TopoDS_Wire> > sep_wire_list;
while (!wire_list.empty()) {
std::list<TopoDS_Wire> sep_list;
TopoDS_Wire wire = wire_list.front();
wire_list.pop_front();
sep_list.push_back(wire);
std::list<TopoDS_Wire>::iterator it = wire_list.begin();
while (it != wire_list.end()) {
if (isInside(wire, *it)) {
sep_list.push_back(*it);
it = wire_list.erase(it);
}
else {
++it;
}
}
sep_wire_list.push_back(sep_list);
}
if (sep_wire_list.size() == 1) {
std::list<TopoDS_Wire>& wires = sep_wire_list.front();
return makeFace(wires);
}
else if (sep_wire_list.size() > 1) {
TopoDS_Compound comp;
BRep_Builder builder;
builder.MakeCompound(comp);
for (std::list< std::list<TopoDS_Wire> >::iterator it = sep_wire_list.begin(); it != sep_wire_list.end(); ++it) {
TopoDS_Shape aFace = makeFace(*it);
if (!aFace.IsNull())
builder.Add(comp, aFace);
}
return comp;
}
else {
return TopoDS_Shape(); // error
}
}
void SketchBased::getUpToFaceFromLinkSub(TopoDS_Face& upToFace,
const App::PropertyLinkSub& refFace)
{
App::DocumentObject* ref = refFace.getValue();
std::vector<std::string> subStrings = refFace.getSubValues();
if (ref == NULL)
throw Base::Exception("SketchBased: Up to face: No face selected");
if (!ref->getTypeId().isDerivedFrom(Part::Feature::getClassTypeId()))
throw Base::Exception("SketchBased: Up to face: Must be face of a feature");
Part::TopoShape baseShape = static_cast<Part::Feature*>(ref)->Shape.getShape();
if (subStrings.empty() || subStrings[0].empty())
throw Base::Exception("SketchBased: Up to face: No face selected");
// TODO: Check for multiple UpToFaces?
upToFace = TopoDS::Face(baseShape.getSubShape(subStrings[0].c_str()));
if (upToFace.IsNull())
throw Base::Exception("SketchBased: Up to face: Failed to extract face");
}
void SketchBased::getUpToFace(TopoDS_Face& upToFace,
const TopoDS_Shape& support,
const TopoDS_Face& supportface,
const TopoDS_Shape& sketchshape,
const std::string& method,
const gp_Dir& dir)
{
if ((method == "UpToLast") || (method == "UpToFirst")) {
// Check for valid support object
if (support.IsNull())
throw Base::Exception("SketchBased: Up to face: No support in Sketch!");
std::vector<Part::cutFaces> cfaces = Part::findAllFacesCutBy(support, sketchshape, dir);
if (cfaces.empty())
throw Base::Exception("SketchBased: Up to face: No faces found in this direction");
// Find nearest/furthest face
std::vector<Part::cutFaces>::const_iterator it, it_near, it_far;
it_near = it_far = cfaces.begin();
for (it = cfaces.begin(); it != cfaces.end(); it++)
if (it->distsq > it_far->distsq)
it_far = it;
else if (it->distsq < it_near->distsq)
it_near = it;
upToFace = (method == "UpToLast" ? it_far->face : it_near->face);
}
// Remove the limits of the upToFace so that the extrusion works even if sketchshape is larger
// than the upToFace
bool remove_limits = false;
TopExp_Explorer Ex;
for (Ex.Init(sketchshape,TopAbs_FACE); Ex.More(); Ex.Next()) {
// Get outermost wire of sketch face
TopoDS_Face sketchface = TopoDS::Face(Ex.Current());
TopoDS_Wire outerWire = ShapeAnalysis::OuterWire(sketchface);
if (!checkWireInsideFace(outerWire, upToFace, dir)) {
remove_limits = true;
break;
}
}
if (remove_limits) {
// Note: Using an unlimited face every time gives unnecessary failures for concave faces
BRepAdaptor_Surface adapt(upToFace, Standard_False);
BRepBuilderAPI_MakeFace mkFace(adapt.Surface().Surface());
if (!mkFace.IsDone())
throw Base::Exception("SketchBased: Up To Face: Failed to create unlimited face");
upToFace = TopoDS::Face(mkFace.Shape());
}
// Check that the upToFace does not intersect the sketch face and
// is not parallel to the extrusion direction (for simplicity, supportface is used instead of sketchshape)
BRepAdaptor_Surface adapt1(TopoDS::Face(supportface));
BRepAdaptor_Surface adapt2(TopoDS::Face(upToFace));
if (adapt2.GetType() == GeomAbs_Plane) {
if (adapt1.Plane().Axis().IsNormal(adapt2.Plane().Axis(), Precision::Confusion()))
throw Base::Exception("SketchBased: Up to face: Must not be parallel to extrusion direction!");
}
// We must measure from sketchshape, not supportface, here
// TODO: distSS() sometimes gives false positives for unlimited upToFaces!
BRepExtrema_DistShapeShape distSS(sketchshape, upToFace);
if (distSS.Value() < Precision::Confusion())
throw Base::Exception("SketchBased: Up to face: Must not intersect sketch!");
}
void SketchBased::generatePrism(TopoDS_Shape& prism,
const TopoDS_Shape& sketchshape,
const std::string& method,
const gp_Dir& dir,
const double L,
const double L2,
const bool midplane,
const bool reversed)
{
if (method == "Length" || method == "TwoLengths" || method == "ThroughAll") {
double Ltotal = L;
double Loffset = 0.;
if (method == "ThroughAll")
// "ThroughAll" is modelled as a very long, but finite prism to avoid problems with pockets
// Note: 1E6 created problems once...
Ltotal = 1E4;
if (method == "TwoLengths") {
// midplane makes no sense here
Loffset = -L2;
Ltotal += L2;
} else if (midplane)
Loffset = -Ltotal/2;
TopoDS_Shape from = sketchshape;
if (method == "TwoLengths" || midplane) {
gp_Trsf mov;
mov.SetTranslation(Loffset * gp_Vec(dir));
TopLoc_Location loc(mov);
from = sketchshape.Moved(loc);
} else if (reversed)
Ltotal *= -1.0;
// Its better not to use BRepFeat_MakePrism here even if we have a support because the
// resulting shape creates problems with Pocket
BRepPrimAPI_MakePrism PrismMaker(from, Ltotal*gp_Vec(dir), 0,1); // finite prism
if (!PrismMaker.IsDone())
throw Base::Exception("SketchBased: Length: Could not extrude the sketch!");
prism = PrismMaker.Shape();
} else {
throw Base::Exception("SketchBased: Internal error: Unknown method for generatePrism()");
}
}
const bool SketchBased::checkWireInsideFace(const TopoDS_Wire& wire, const TopoDS_Face& face,
const gp_Dir& dir) {
// Project wire onto the face (face, not surface! So limits of face apply)
// FIXME: For a user-selected upToFace, sometimes this returns a non-closed wire for no apparent reason
// Check again after introduction of "robust" reference for upToFace
BRepProj_Projection proj(wire, face, dir);
return (proj.More() && proj.Current().Closed());
}
void SketchBased::remapSupportShape(const TopoDS_Shape& newShape)
{
std::vector<App::DocumentObject*> refs = this->getInList();
for (std::vector<App::DocumentObject*>::iterator it = refs.begin(); it != refs.end(); ++it) {
if ((*it)->isDerivedFrom(Part::Part2DObject::getClassTypeId())) {
Part::Part2DObject* part = static_cast<Part::Part2DObject*>(*it);
Part::TopoShape shape = this->Shape.getValue();
// here we must reset the placement otherwise the geometric matching doesn't work
shape._Shape.Location(TopLoc_Location());
std::vector<std::string> subValues = part->Support.getSubValues();
std::vector<std::string> newSubValues;
TopTools_IndexedMapOfShape faceMap;
TopExp::MapShapes(newShape, TopAbs_FACE, faceMap);
for (std::vector<std::string>::iterator it = subValues.begin(); it != subValues.end(); ++it) {
std::string shapetype;
if (it->size() > 4 && it->substr(0,4) == "Face") {
shapetype = "Face";
}
else if (it->size() > 4 && it->substr(0,4) == "Edge") {
shapetype = "Edge";
}
else if (it->size() > 6 && it->substr(0,6) == "Vertex") {
shapetype = "Vertex";
}
else {
continue;
}
TopoDS_Shape element = shape.getSubShape(it->c_str());
bool success = false;
// first try an exact matching
for (int i=1; i<faceMap.Extent(); i++) {
if (isQuasiEqual(element, faceMap.FindKey(i))) {
std::stringstream str;
str << shapetype << i;
newSubValues.push_back(str.str());
success = true;
break;
}
}
// if an exact matching fails then try to compare only the geometries
if (!success) {
for (int i=1; i<faceMap.Extent(); i++) {
if (isEqualGeometry(element, faceMap.FindKey(i))) {
std::stringstream str;
str << shapetype << i;
newSubValues.push_back(str.str());
success = true;
break;
}
}
}
// the new shape couldn't be found so keep the old sub-name
if (!success)
newSubValues.push_back(*it);
}
part->Support.setValue(this, newSubValues);
}
}
}
struct gp_Pnt_Less : public std::binary_function<const gp_Pnt&,
const gp_Pnt&, bool>
{
bool operator()(const gp_Pnt& p1,
const gp_Pnt& p2) const
{
if (fabs(p1.X() - p2.X()) > Precision::Confusion())
return p1.X() < p2.X();
if (fabs(p1.Y() - p2.Y()) > Precision::Confusion())
return p1.Y() < p2.Y();
if (fabs(p1.Z() - p2.Z()) > Precision::Confusion())
return p1.Z() < p2.Z();
return false; // points are considered to be equal
}
};
bool SketchBased::isQuasiEqual(const TopoDS_Shape& s1, const TopoDS_Shape& s2) const
{
if (s1.ShapeType() != s2.ShapeType())
return false;
TopTools_IndexedMapOfShape map1, map2;
TopExp::MapShapes(s1, TopAbs_VERTEX, map1);
TopExp::MapShapes(s2, TopAbs_VERTEX, map2);
if (map1.Extent() != map2.Extent())
return false;
std::vector<gp_Pnt> p1;
for (int i=1; i<=map1.Extent(); i++) {
const TopoDS_Vertex& v = TopoDS::Vertex(map1.FindKey(i));
p1.push_back(BRep_Tool::Pnt(v));
}
std::vector<gp_Pnt> p2;
for (int i=1; i<=map2.Extent(); i++) {
const TopoDS_Vertex& v = TopoDS::Vertex(map2.FindKey(i));
p2.push_back(BRep_Tool::Pnt(v));
}
std::sort(p1.begin(), p1.end(), gp_Pnt_Less());
std::sort(p2.begin(), p2.end(), gp_Pnt_Less());
if (p1.size() != p2.size())
return false;
std::vector<gp_Pnt>::iterator it = p1.begin(), jt = p2.begin();
for (; it != p1.end(); ++it, ++jt) {
if (!(*it).IsEqual(*jt, Precision::Confusion()))
return false;
}
return true;
}
bool SketchBased::isEqualGeometry(const TopoDS_Shape& s1, const TopoDS_Shape& s2)
{
if (s1.ShapeType() == TopAbs_FACE && s2.ShapeType() == TopAbs_FACE) {
BRepAdaptor_Surface a1(TopoDS::Face(s1));
BRepAdaptor_Surface a2(TopoDS::Face(s2));
if (a1.GetType() == GeomAbs_Plane && a2.GetType() == GeomAbs_Plane) {
gp_Pln p1 = a1.Plane();
gp_Pln p2 = a2.Plane();
if (p1.Distance(p2.Location()) < Precision::Confusion()) {
const gp_Dir& d1 = p1.Axis().Direction();
const gp_Dir& d2 = p2.Axis().Direction();
if (d1.IsParallel(d2, Precision::Confusion()))
return true;
}
}
}
else if (s1.ShapeType() == TopAbs_EDGE && s2.ShapeType() == TopAbs_EDGE) {
}
else if (s1.ShapeType() == TopAbs_VERTEX && s2.ShapeType() == TopAbs_VERTEX) {
gp_Pnt p1 = BRep_Tool::Pnt(TopoDS::Vertex(s1));
gp_Pnt p2 = BRep_Tool::Pnt(TopoDS::Vertex(s2));
return p1.Distance(p2) < Precision::Confusion();
}
return false;
}
}
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