int main(int argc, char *argv[])
{
if(argc < 2)
{
std::cout << "Usage: " << std::endl;
std::cout << "extractStlPoints [InputSTLFile]" << std::endl;
return 1;
}
char* inputFileName = argv[1];
TopoDS_Shape stlShape;
std::cout << "Reading STL file " << inputFileName << " ..." << std::flush;
StlAPI::Read(stlShape,inputFileName);
std::cout << "done.";
Handle_TColgp_HArray1OfPnt extractedPoints = StlPointsExtractor::extractVerticesFromTopoDSShape(stlShape);
WriteCoordinatesToFile::writeCoordinatesToFile("stlOutput.txt",extractedPoints->Array1());
return 0;
}
int main(int argc, char *argv[])
{
//Create a circle like before
gp_Pnt centerPoint(2.5,2.5,0);
gp_Dir normalDirection(0.0,0.0,1.0);
gp_Dir xDirection(1.0,0.0,0.0);
gp_Ax2 axis(centerPoint,normalDirection,xDirection);
//Creating the circle
gp_Circ circle(axis,2.5);
Standard_Integer resolution = 20;
//Here, an array of gp_Pnt is allocated, with 500 elements
//Note that the indexing runs from 1 to 500, instead of the
//standard convention of 0-499
TColgp_Array1OfPnt pointsOnCircle(1,resolution);
//Distribute the points and write them out to a file
PointOnCurveDistribution::distributePointsOnCurve(circle,pointsOnCircle,0.0,2.0*PI,resolution);
WriteCoordinatesToFile::writeCoordinatesToFile("chapter3points.txt",pointsOnCircle);
//Sum the area of the small triangles, to get an approximate area
//The for loop builds triangles with two corners on the circumference
//and the center of the circle as third point
double totalArea = 0.0;
for(Standard_Integer i=1;i<=resolution;i++)
{
gp_Pnt firstPntOfTriangle = pointsOnCircle.Value(i);
gp_Pnt secondPntOfTriangle;
if(i != resolution)
{
secondPntOfTriangle = pointsOnCircle.Value(i+1);
}
else
{
//If we are at the end of the array, take the first point
//because of periodicity
secondPntOfTriangle = pointsOnCircle.Value(1);
}
gp_Pnt thirdPntOfTriangle = centerPoint;
//A Handle (like a smart pointer) is built to an array of points
Handle_TColgp_HArray1OfPnt trianglePointsArray = new TColgp_HArray1OfPnt(1,3);
trianglePointsArray->ChangeValue(1) = firstPntOfTriangle;
trianglePointsArray->ChangeValue(2) = secondPntOfTriangle;
trianglePointsArray->ChangeValue(3) = thirdPntOfTriangle;
totalArea += AreaCalculations::calculateTriangleArea(trianglePointsArray);
}
std::cout << "Polygonized area: " << totalArea << std::endl;
std::cout << "Reference area: " << circle.Area() << std::endl;
std::cout << "Error " << fabs(totalArea-circle.Area())/circle.Area() << std::endl;
return 0;
}
Standard_Boolean CircleFitCostFunction::Value(const math_Vector& X, Standard_Real& F)
{
double sum = 0.0;
for(Standard_Integer i = myPointsToFitOnto->Lower();i<=myPointsToFitOnto->Upper();i++)
{
double pxMinusCx = myPointsToFitOnto->Value(i).X()-X(1);
double pyMinusCy = myPointsToFitOnto->Value(i).Y()-X(2);
sum += (pxMinusCx*pxMinusCx+pyMinusCy*pyMinusCy-X(3)*X(3))*(pxMinusCx*pxMinusCx+pyMinusCy*pyMinusCy-X(3)*X(3));
}
F = sum;
return Standard_True;
}
LeastSquaresFitting::InitialGuessForLeastSquaresFitting LeastSquaresFitting::findInitialGuess(const Handle_TColgp_HArray1OfPnt& points)
{
//Compute center of gravity for point set
double cx=0.0;
double cy=0.0;
for(Standard_Integer i=points->Lower();i<=points->Upper();i++)
{
cx += points->Value(i).X();
cy += points->Value(i).Y();
}
cx /= points->Length();
cy /= points->Length();
gp_Pnt centerPoint(cx,cy,0.0);
//Compute average radius
double averageRadius = 0.0;
for(Standard_Integer i=points->Lower();i<=points->Upper();i++)
{
averageRadius += centerPoint.Distance(points->Value(i));
}
averageRadius /= points->Length();
return InitialGuessForLeastSquaresFitting(centerPoint,averageRadius);
}
PyObject* BSplineCurvePy::interpolate(PyObject *args)
{
PyObject* obj;
double tol3d = Precision::Approximation();
PyObject* periodic = Py_False;
PyObject* t1=0; PyObject* t2=0;
if (!PyArg_ParseTuple(args, "O|O!dO!O!",&obj, &PyBool_Type, &periodic, &tol3d,
&Base::VectorPy::Type, &t1, &Base::VectorPy::Type, &t2))
return 0;
try {
Py::Sequence list(obj);
Handle_TColgp_HArray1OfPnt interpolationPoints = new TColgp_HArray1OfPnt(1, list.size());
Standard_Integer index = 1;
for (Py::Sequence::iterator it = list.begin(); it != list.end(); ++it) {
Py::Vector v(*it);
Base::Vector3d pnt = v.toVector();
interpolationPoints->SetValue(index++, gp_Pnt(pnt.x,pnt.y,pnt.z));
}
if (interpolationPoints->Length() < 2) {
Standard_Failure::Raise("not enough points given");
}
GeomAPI_Interpolate aBSplineInterpolation(interpolationPoints,
PyObject_IsTrue(periodic) ? Standard_True : Standard_False, tol3d);
if (t1 && t2) {
Base::Vector3d v1 = Py::Vector(t1,false).toVector();
Base::Vector3d v2 = Py::Vector(t2,false).toVector();
gp_Vec initTangent(v1.x,v1.y,v1.z), finalTangent(v2.x,v2.y,v2.z);
aBSplineInterpolation.Load(initTangent, finalTangent);
}
aBSplineInterpolation.Perform();
if (aBSplineInterpolation.IsDone()) {
Handle_Geom_BSplineCurve aBSplineCurve(aBSplineInterpolation.Curve());
this->getGeomBSplineCurvePtr()->setHandle(aBSplineCurve);
Py_Return;
}
else {
Standard_Failure::Raise("failed to interpolate points");
return 0; // goes to the catch block
}
}
catch (Standard_Failure) {
Handle_Standard_Failure e = Standard_Failure::Caught();
std::string err = e->GetMessageString();
if (err.empty()) err = e->DynamicType()->Name();
PyErr_SetString(PartExceptionOCCError, err.c_str());
return 0;
}
}
double calculateTriangleArea(const Handle_TColgp_HArray1OfPnt triangleCorners)
{
//We compute the area of the triangle using the determinant approach
//First, allocate a 3 by 3 matrix for the calculation
math_Matrix matrixForAreaCalculation(0,2,0,2);
//Then fill it with the coordinates of the triangle corners
matrixForAreaCalculation(0,0) = triangleCorners->Value(1).X();
matrixForAreaCalculation(0,1) = triangleCorners->Value(1).Y();
matrixForAreaCalculation(0,2) = 1.0;
matrixForAreaCalculation(1,0) = triangleCorners->Value(2).X();
matrixForAreaCalculation(1,1) = triangleCorners->Value(2).Y();
matrixForAreaCalculation(1,2) = 1.0;
matrixForAreaCalculation(2,0) = triangleCorners->Value(3).X();
matrixForAreaCalculation(2,1) = triangleCorners->Value(3).Y();
matrixForAreaCalculation(2,2) = 1.0;
double area = 0.5 * matrixForAreaCalculation.Determinant();
return area;
}
Standard_Boolean CircleFitCostFunction::Gradient(const math_Vector& X, math_Vector& G)
{
double g0 = 0.0;
double g1 = 0.0;
double g2 = 0.0;
for(Standard_Integer i = myPointsToFitOnto->Lower();i<=myPointsToFitOnto->Upper();i++)
{
double pxMinusCx = myPointsToFitOnto->Value(i).X()-X(1);
double pyMinusCy = myPointsToFitOnto->Value(i).Y()-X(2);
double distance = pxMinusCx*pxMinusCx+pyMinusCy*pyMinusCy-X(3)*X(3);
g0 += pxMinusCx*distance;
g1 += pyMinusCy*distance;
g2 += distance;
}
G(1) = -4.0*g0;
G(2) = -4.0*g1;
G(3) = -4.0*X(3)*g2;
return Standard_True;
}
PyObject* BSplineCurvePy::interpolate(PyObject *args, PyObject *kwds)
{
PyObject* obj;
PyObject* par = 0;
double tol3d = Precision::Approximation();
PyObject* periodic = Py_False;
PyObject* t1 = 0; PyObject* t2 = 0;
PyObject* ts = 0; PyObject* fl = 0;
PyObject* scale = Py_True;
static char* kwds_interp[] = {"Points", "PeriodicFlag", "Tolerance", "InitialTangent", "FinalTangent",
"Tangents", "TangentFlags", "Parameters", "Scale", NULL};
if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|O!dO!O!OOOO!",kwds_interp,
&obj, &PyBool_Type, &periodic, &tol3d,
&Base::VectorPy::Type, &t1,
&Base::VectorPy::Type, &t2,
&ts, &fl, &par, &PyBool_Type, &scale))
return 0;
try {
Py::Sequence list(obj);
Handle_TColgp_HArray1OfPnt interpolationPoints = new TColgp_HArray1OfPnt(1, list.size());
Standard_Integer index = 1;
for (Py::Sequence::iterator it = list.begin(); it != list.end(); ++it) {
Py::Vector v(*it);
Base::Vector3d pnt = v.toVector();
interpolationPoints->SetValue(index++, gp_Pnt(pnt.x,pnt.y,pnt.z));
}
if (interpolationPoints->Length() < 2) {
Standard_Failure::Raise("not enough points given");
}
Handle_TColStd_HArray1OfReal parameters;
if (par) {
Py::Sequence plist(par);
parameters = new TColStd_HArray1OfReal(1, plist.size());
Standard_Integer pindex = 1;
for (Py::Sequence::iterator it = plist.begin(); it != plist.end(); ++it) {
Py::Float f(*it);
parameters->SetValue(pindex++, static_cast<double>(f));
}
}
std::unique_ptr<GeomAPI_Interpolate> aBSplineInterpolation;
if (parameters.IsNull()) {
aBSplineInterpolation.reset(new GeomAPI_Interpolate(interpolationPoints,
PyObject_IsTrue(periodic) ? Standard_True : Standard_False, tol3d));
}
else {
aBSplineInterpolation.reset(new GeomAPI_Interpolate(interpolationPoints, parameters,
PyObject_IsTrue(periodic) ? Standard_True : Standard_False, tol3d));
}
if (t1 && t2) {
Base::Vector3d v1 = Py::Vector(t1,false).toVector();
Base::Vector3d v2 = Py::Vector(t2,false).toVector();
gp_Vec initTangent(v1.x,v1.y,v1.z), finalTangent(v2.x,v2.y,v2.z);
aBSplineInterpolation->Load(initTangent, finalTangent, PyObject_IsTrue(scale)
? Standard_True : Standard_False);
}
else if (ts && fl) {
Py::Sequence tlist(ts);
TColgp_Array1OfVec tangents(1, tlist.size());
Standard_Integer index = 1;
for (Py::Sequence::iterator it = tlist.begin(); it != tlist.end(); ++it) {
Py::Vector v(*it);
Base::Vector3d vec = v.toVector();
tangents.SetValue(index++, gp_Vec(vec.x,vec.y,vec.z));
}
Py::Sequence flist(fl);
Handle_TColStd_HArray1OfBoolean tangentFlags = new TColStd_HArray1OfBoolean(1, flist.size());
Standard_Integer findex = 1;
for (Py::Sequence::iterator it = flist.begin(); it != flist.end(); ++it) {
Py::Boolean flag(*it);
tangentFlags->SetValue(findex++, static_cast<bool>(flag) ? Standard_True : Standard_False);
}
aBSplineInterpolation->Load(tangents, tangentFlags, PyObject_IsTrue(scale)
? Standard_True : Standard_False);
}
aBSplineInterpolation->Perform();
if (aBSplineInterpolation->IsDone()) {
Handle_Geom_BSplineCurve aBSplineCurve(aBSplineInterpolation->Curve());
this->getGeomBSplineCurvePtr()->setHandle(aBSplineCurve);
Py_Return;
}
else {
Standard_Failure::Raise("failed to interpolate points");
return 0; // goes to the catch block
}
}
catch (Standard_Failure) {
Handle_Standard_Failure e = Standard_Failure::Caught();
std::string err = e->GetMessageString();
if (err.empty()) err = e->DynamicType()->Name();
PyErr_SetString(PartExceptionOCCError, err.c_str());
return 0;
}
}
