#include <BRepAlgoAPI_Section.hxx>
Inheritance diagram for BRepAlgoAPI_Section:
Public Member Functions | |
void * | operator new (size_t, void *anAddress) |
void * | operator new (size_t size) |
void | operator delete (void *anAddress) |
Standard_EXPORT | BRepAlgoAPI_Section (const TopoDS_Shape &S1, const TopoDS_Shape &S2, const BOPTools_DSFiller &aDSF, const Standard_Boolean PerformNow=Standard_True) |
Standard_EXPORT | BRepAlgoAPI_Section (const TopoDS_Shape &Sh1, const TopoDS_Shape &Sh2, const Standard_Boolean PerformNow=Standard_True) |
see upper | |
Standard_EXPORT | BRepAlgoAPI_Section (const TopoDS_Shape &Sh, const gp_Pln &Pl, const Standard_Boolean PerformNow=Standard_True) |
see upper | |
Standard_EXPORT | BRepAlgoAPI_Section (const TopoDS_Shape &Sh, const Handle(Geom_Surface)&Sf, const Standard_Boolean PerformNow=Standard_True) |
see upper | |
Standard_EXPORT | BRepAlgoAPI_Section (const Handle(Geom_Surface)&Sf, const TopoDS_Shape &Sh, const Standard_Boolean PerformNow=Standard_True) |
see upper | |
Standard_EXPORT | BRepAlgoAPI_Section (const Handle(Geom_Surface)&Sf1, const Handle(Geom_Surface)&Sf2, const Standard_Boolean PerformNow=Standard_True) |
This and the above classes construct a framework for computing the section lines of: - two shapes Sh1 and Sh2, or - shape Sh and plane Pl, or - shape Sh and surface Sf, or - surface Sf and shape Sh, or - two surfaces Sf1 and Sf2, and builds a result if PerformNow equals true, its default value. If PerformNow equals false, the intersection will be computed later by the function Build. The constructed shape will be returned by the function Shape. This is a compound object composed of edges. These intersection edges may be built: - on new intersection lines, or - on coincident portions of edges in the two intersected shapes. These intersection edges are independent: they are not chained or grouped in wires. If no intersection edge exists, the result is an empty compound object. Note that other objects than TopoDS_Shape shapes involved in these syntaxes are converted into faces or shells before performing the computation of the intersection. A shape resulting from this conversion can be retrieved with the function Shape1 or Shape2. Parametric 2D curves on intersection edges No parametric 2D curve (pcurve) is defined for each elementary edge of the result. To attach such parametric curves to the constructed edges you may use a constructor with the PerformNow flag equal to false; then you use: - the function ComputePCurveOn1 to ask for the additional computation of a pcurve in the parametric space of the first shape, - the function ComputePCurveOn2 to ask for the additional computation of a pcurve in the parametric space of the second shape, in the end, - the function Build to construct the result. Approximation of intersection edges The underlying 3D geometry attached to each elementary edge of the result is: - analytic where possible, provided the corresponding geometry corresponds to a type of analytic curve defined in the Geom package; for example, the intersection of a cylindrical shape with a plane gives an ellipse or a circle; - or elsewhere, given as a succession of points grouped together in a BSpline curve of degree 1. If you prefer to have an attached 3D geometry which is a BSpline approximation of the computed set of points on computed elementary intersection edges whose underlying geometry is not analytic, you may use a constructor with the PerformNow flag equal to false. Then you use: - the function Approximation to ask for this computation option, and - the function Build to construct the result. - Note that as a result, approximations will only be computed on edges built on new intersection lines. - Example You may also combine these computation options. In the following example: - each elementary edge of the computed intersection, built on a new intersection line, which does not correspond to an analytic Geom curve, will be approximated by a BSpline curve whose degree is not greater than 8. - each elementary edge built on a new intersection line, will have: - a pcurve in the parametric space of the intersected face of shape S1, - no pcurve in the parametric space of the intersected face of shape S2. // TopoDS_Shape S1 = ... , S2 = ... ; Standard_Boolean PerformNow = Standard_False; BRepAlgoAPI_Section S ( S1, S2, PerformNow ); S.ComputePCurveOn1 (Standard_True); S.Approximation (Standard_True); S.Build(); TopoDS_Shape R = S.Shape(); . | |
Standard_EXPORT void | Init1 (const TopoDS_Shape &S1) |
initialize first part | |
Standard_EXPORT void | Init1 (const gp_Pln &Pl) |
initialize first part | |
Standard_EXPORT void | Init1 (const Handle(Geom_Surface)&Sf) |
initialize first part | |
Standard_EXPORT void | Init2 (const TopoDS_Shape &S2) |
initialize second part | |
Standard_EXPORT void | Init2 (const gp_Pln &Pl) |
initialize second part | |
Standard_EXPORT void | Init2 (const Handle(Geom_Surface)&Sf) |
Reinitializes the first and the second parts on which this algorithm is going to perform the intersection computation. This is done with either: the surface Sf, the plane Pl or the shape Sh. You use the function Build to construct the result. . | |
Standard_EXPORT void | Approximation (const Standard_Boolean B) |
Defines an option for computation of further intersections. This computation will be performed by the function Build in this framework. By default, the underlying 3D geometry attached to each elementary edge of the result of a computed intersection is: - analytic where possible, provided the corresponding geometry corresponds to a type of analytic curve defined in the Geom package; for example the intersection of a cylindrical shape with a plane gives an ellipse or a circle; - or elsewhere, given as a succession of points grouped together in a BSpline curve of degree 1. If Approx equals true, when further computations are performed in this framework with the function Build, these edges will have an attached 3D geometry which is a BSpline approximation of the computed set of points. Note that as a result, approximations will be computed on edges built only on new intersection lines. . | |
Standard_EXPORT void | ComputePCurveOn1 (const Standard_Boolean B) |
Indicates if the Pcurve must be (or not) performed on first part. . | |
Standard_EXPORT void | ComputePCurveOn2 (const Standard_Boolean B) |
Define options for the computation of further intersections, which will be performed by the function Build in this framework. By default, no parametric 2D curve (pcurve) is defined for the elementary edges of the result. If ComputePCurve1 equals true, further computations performed in this framework with the function Build will attach an additional pcurve in the parametric space of the first shape to the constructed edges. If ComputePCurve2 equals true, the additional pcurve will be attached to the constructed edges in the parametric space of the second shape. These two functions may be used together. . | |
Standard_EXPORT void | Build () |
Performs the computation of section lines between two parts defined at the time of construction of this framework or reinitialized with the Init1 and Init2 functions. The constructed shape will be returned by the function Shape. This is a compound object composed of edges. These intersection edges may be built: - on new intersection lines, or - on coincident portions of edges in the two intersected shapes. These intersection edges are independent: they are not chained or grouped into wires. If no intersection edge exists, the result is an empty compound object. The shapes involved in the construction of section lines can be retrieved with the function Shape1 or Shape2. Note that other objects than TopoDS_Shape shapes given as arguments at the construction time of this framework, or to the Init1 or Init2 function, are converted into faces or shells before performing the computation of the intersection. Parametric 2D curves on intersection edges No parametric 2D curve (pcurve) is defined for the elementary edges of the result. To attach parametric curves like this to the constructed edges you have to use: - the function ComputePCurveOn1 to ask for the additional computation of a pcurve in the parametric space of the first shape, - the function ComputePCurveOn2 to ask for the additional computation of a pcurve in the parametric space of the second shape. This must be done before calling this function. Approximation of intersection edges The underlying 3D geometry attached to each elementary edge of the result is: - analytic (where possible) provided the corresponding geometry corresponds to a type of analytic curve defined in the Geom package; for example, the intersection of a cylindrical shape with a plane gives an ellipse or a circle; or - elsewhere, given as a succession of points grouped together in a BSpline curve of degree 1. If, on computed elementary intersection edges whose underlying geometry is not analytic, you prefer to have an attached 3D geometry which is a Bspline approximation of the computed set of points, you have to use the function Approximation to ask for this computation option before calling this function. You may also have combined these computation options: look at the example given above to illustrate the use of the constructors. . | |
Standard_EXPORT Standard_Boolean | HasAncestorFaceOn1 (const TopoDS_Shape &E, TopoDS_Shape &F) const |
get the face of the first part giving section edge <e>. Returns True on the 3 following conditions : 1/ <e> is an edge returned by the Shape() method. 2/ First part of section performed is a shape. 3/ <e> is built on a intersection curve (i.e <e> is not the result of common edges) When False, F remains untouched. | |
Standard_EXPORT Standard_Boolean | HasAncestorFaceOn2 (const TopoDS_Shape &E, TopoDS_Shape &F) const |
Identifies the ancestor faces of the intersection edge E resulting from the last computation performed in this framework, that is, the faces of the two original shapes on which the edge E lies: - HasAncestorFaceOn1 gives the ancestor face in the first shape, and - HasAncestorFaceOn2 gives the ancestor face in the second shape. These functions return true if an ancestor face F is found, or false if not. An ancestor face is identifiable for the edge E if the following conditions are satisfied: - the first part on which this algorithm performed its last computation is a shape, that is, it was not given as a surface or a plane at the time of construction of this algorithm or at a later time by the Init1 function, - E is one of the elementary edges built by the last computation of this section algorithm. To use these functions properly, you have to test the returned Boolean value before using the ancestor face: F is significant only if the returned Boolean value equals true. . | |
Standard_EXPORT Handle_Geom2d_Curve | PCurveOn1 (const TopoDS_Shape &E) const |
returns the PCurve connected to section edge <e> and lying on first part of Section. N.B : PCurve on first part is computed only if Section is performed after setting ComputePCurveOn1(Standard_True). | |
Standard_EXPORT Handle_Geom2d_Curve | PCurveOn2 (const TopoDS_Shape &E) const |
returns the PCurve connected to section edge <e> and lying on second part of Section. N.B : PCurve on second part is computed only if Section is performed after setting ComputePCurveOn2(Standard_True). Warning No pcurve is attached to an elementary edge of the resulting section, and the function returns a null handle, unless the function ComputePCurveOn1 or ComputePCurveOn2 was previously used to define this sort of option of computation. - A null handle is also returned if the edge E does not belong to the last computed intersection, that is, if it is not one of the elementary edges of the compound object returned by the function Shape. | |
Private Member Functions | |
Standard_EXPORT void | InitParameters () |
Private Attributes | |
Standard_Boolean | myshapeisnull |
Standard_Boolean | myparameterschanged |
Standard_Boolean | myApprox |
Standard_Boolean | myComputePCurve1 |
Standard_Boolean | myComputePCurve2 |
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Reimplemented from BRepAlgoAPI_BooleanOperation. |
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Reimplemented from BRepAlgoAPI_BooleanOperation. |
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Reimplemented from BRepAlgoAPI_BooleanOperation. |
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Reimplemented from BRepAlgoAPI_BooleanOperation. |
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