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0030354: BOP Cut doesn't modify the attached face

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The reason of this problem is in wrong work of classifier algorithm (see the message ~0080992 to the issue #30354). Therefore, the algorithm of IntTools_FClass2d class has been improved. Namely, now orientation of the polygon is computed from area-criterion instead of angle. As result, some simplification of the method IntTools_FClass2d::Init(...) has been made.

<!break>

1. New constructor has been added to the class CSLib_Class2d. It allows applying TColgp_SequenceOfPnt2d.

2. DRAW-commands "addpolygonnode" and "polygonprops" have been created. They are covered by the test case "tests/geometry/2dpolygon/A1".

3. New method Poly::PolygonProperties(...) has been created. See help for detailed information.

4. New testgrid "lowalgos classifier" has been created.
This commit is contained in:
nbv
2018-11-09 10:22:55 +03:00
committed by apn
parent dc57476a0e
commit 5fe14d0fac
27 changed files with 478 additions and 234 deletions
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45
src/Poly/Poly.hxx
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@@ -20,12 +20,13 @@
#include <Standard.hxx>
#include <Standard_DefineAlloc.hxx>
#include <Standard_Handle.hxx>
#include <Poly_ListOfTriangulation.hxx>
#include <Standard_OStream.hxx>
#include <Standard_Boolean.hxx>
#include <Standard_IStream.hxx>
#include <Standard_Real.hxx>
#include <TColgp_SequenceOfPnt2d.hxx>
class Poly_Triangulation;
class Poly_Polygon3D;
class Poly_Polygon2D;
@@ -125,6 +126,48 @@ public:
Standard_EXPORT static Standard_Real PointOnTriangle (const gp_XY& P1, const gp_XY& P2, const gp_XY& P3, const gp_XY& P, gp_XY& UV);
//! Returns area and perimeter of 2D-polygon given by its vertices.
//! theArea will be negative if the polygon is bypassed clockwise
//! and will be positive, otherwise. thePerimeter will always be positive.
//!
//! ATTENTION!!!
//! The container theSeqPnts of 2D-points gp_Pnt2d must have definition
//! for following methods: Length(), Lower(), Upper() and Value(Standard_Integer)
//! (e.g. it can be either NCollection_Sequence<gp_Pnt2d> or
//! NCollection_Array1<gp_Pnt2d>).
template <class TypeSequencePnts>
Standard_EXPORT static
Standard_Boolean PolygonProperties(const TypeSequencePnts& theSeqPnts,
Standard_Real& theArea,
Standard_Real& thePerimeter)
{
if (theSeqPnts.Length() < 2)
{
theArea = thePerimeter = 0.0;
return Standard_True;
}
Standard_Integer aStartIndex = theSeqPnts.Lower();
const gp_XY &aRefPnt = theSeqPnts.Value(aStartIndex++).XY();
gp_XY aPrevPt = theSeqPnts.Value(aStartIndex++).XY() - aRefPnt, aCurrPt;
theArea = 0.0;
thePerimeter = aPrevPt.Modulus();
for (Standard_Integer i = aStartIndex; i <= theSeqPnts.Upper(); i++)
{
aCurrPt = theSeqPnts.Value(i).XY() - aRefPnt;
const Standard_Real aDelta = aPrevPt.Crossed(aCurrPt);
theArea += aDelta;
thePerimeter += (aPrevPt - aCurrPt).Modulus();
aPrevPt = aCurrPt;
}
thePerimeter += aPrevPt.Modulus();
theArea *= 0.5;
return Standard_True;
}
protected: