//=======================================================================
gp_Pnt CurveCreator_Utils::ConvertClickToPoint( int x, int y, Handle(V3d_View) aView )
{
- return GEOMUtils::ConvertClickToPoint( x, y, aView );
+ // the 3D point, that is a projection of the pixels to the XYZ view plane
+ //return GEOMUtils::ConvertClickToPoint( x, y, aView );
+
+ // we need the projection to the XOY plane
+ // 1. find a point in the plane of the eye and the normal to the plane
+ Standard_Real X, Y, Z;
+ Quantity_Parameter Vx, Vy, Vz;
+ aView->ConvertWithProj( x, y, X, Y, Z, Vx, Vy, Vz );
+
+ // 2. build a ray from the point by the normal to the XOY plane and intersect it
+ // The ray equation is the following : p(x,y,z) = p0(x,y,z) + t*V(x,y,z)
+ // X,Y,Z - defines p0(x,y,z), Vx,Vy,Vz - defines V(x,y,z)
+ // p(x,y,z) - is a searched point, t - should to be calculated by the condition of XOY plane
+ // The system of equations is the following:
+ // p(x) = p0(x)+t*V(x)
+ // p(y) = p0(y)+t*V(y)
+ // p(z) = p0(z)+t*V(z)
+ // p(z) = 0
+
+ Standard_Real aXp, aYp, aZp;
+ //It is not possible to use Precision::Confusion(), because it is e-0.8, but V is sometimes e-6
+ Standard_Real aPrec = LOCAL_SELECTION_TOLERANCE;
+ if ( fabs( Vz ) > aPrec ) {
+ Standard_Real aT = -Z/Vz;
+ aXp = X + aT*Vx;
+ aYp = Y + aT*Vy;
+ aZp = Z + aT*Vz;
+ }
+ else { // Vz = 0 - the eyed plane is orthogonal to Z plane - XOZ, or YOZ
+ aXp = aYp = aZp = 0;
+ if ( fabs( Vy ) < aPrec ) // Vy = 0 - the YOZ plane
+ aYp = Y;
+ else if ( fabs( Vx ) < aPrec ) // Vx = 0 - the XOZ plane
+ aXp = X;
+ }
+ /*std::cout << "ConvertClickToPoint: " << std::endl
+ << "XYZ1 = (" << X << ", " << Y << ", " << Z << "); " << std::endl
+ << "Vxyz = (" << Vx << ", " << Vy << ", " << Vz << "); " << std::endl
+ << "Resp = (" << aXp << ", " << aYp << ", " << aZp << "); " << std::endl;*/
+
+ gp_Pnt ResultPoint( aXp, aYp, aZp );
+ return ResultPoint;
}
void CurveCreator_Utils::constructShape( const CurveCreator_ICurve* theCurve,
// compute BSpline
Handle(Geom_BSplineCurve) aBSplineCurve;
GeomAPI_Interpolate aGBC(aHCurvePoints, aSectIsClosed, gp::Resolution());
- aGBC.Load(aTangents, aTangentFlags);
+ // correct the spline degree to be as 3 for non-periodic spline if number of points
+ // less than 3. It is need to have a knot in each spline point. This knots are used
+ // to found a neighbour points when a new point is inserted between two existing.
+ if (!aSectIsClosed ) {
+ if (aHCurvePoints->Length() == 3)
+ aGBC.Load(aTangents, aTangentFlags);
+ }
aGBC.Perform();
if ( aGBC.IsDone() )
