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The methods HasAncestorFaceOn1() and HasAncestorFaceOn1() return true only in the case when their first argument is the new edge built from intersection curve and not an existing common edge. PCurveOn1() and PCurveOn2() have been removed. Methods PCurveOn1() and PCurveOn2() removed from BRepAlgo_Section class. Added test case bugs/modalg_5/bug23881
355 lines
16 KiB
Plaintext
Executable File
355 lines
16 KiB
Plaintext
Executable File
-- Created on: 1994-02-18
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-- Created by: Remi LEQUETTE
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-- Copyright (c) 1994-1999 Matra Datavision
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-- Copyright (c) 1999-2012 OPEN CASCADE SAS
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--
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-- The content of this file is subject to the Open CASCADE Technology Public
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-- License Version 6.5 (the "License"). You may not use the content of this file
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-- except in compliance with the License. Please obtain a copy of the License
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-- at http://www.opencascade.org and read it completely before using this file.
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--
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-- The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
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-- main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
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--
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-- The Original Code and all software distributed under the License is
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-- distributed on an "AS IS" basis, without warranty of any kind, and the
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-- Initial Developer hereby disclaims all such warranties, including without
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-- limitation, any warranties of merchantability, fitness for a particular
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-- purpose or non-infringement. Please see the License for the specific terms
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-- and conditions governing the rights and limitations under the License.
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class Section from BRepAlgo inherits BooleanOperation from BRepAlgo
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---Purpose: Construction of the section lines between two shapes.
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-- For this Boolean operation, each face of the first
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-- shape is intersected by each face of the second
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-- shape. The resulting intersection edges are brought
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-- together into a compound object, but not chained or
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-- grouped into wires.
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-- Computation of the intersection of two Shapes or Surfaces
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-- The two parts involved in this Boolean operation may
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-- be defined from geometric surfaces: the most common
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-- use is the computation of the planar section of a shape.
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-- A Section object provides the framework for:
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-- - defining the shapes to be intersected, and the
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-- computation options,
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-- - implementing the construction algorithm, and
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-- - consulting the result.
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-- Example : giving two shapes S1,S2 accessing faces,
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-- let compute the section edges R on S1,S2,
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-- performing approximation on new curves,
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-- performing PCurve on part 1 but not on part 2 :
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-- Standard_Boolean PerformNow = Standard_False;
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-- BRepBoolAPI_Section S(S1,S2,PerformNow);
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-- S.ComputePCurveOn1(Standard_True);
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-- S.Approximation(Standard_True);
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-- S.Build();
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-- TopoDS_Shape R = S.Shape();
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-- On Null Shapes of geometries, NotDone() is called.
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uses
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Shape from TopoDS,
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Surface from Geom,
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Pln from gp,
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Curve from Geom2d
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is
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Create(Sh1,Sh2 : Shape from TopoDS;
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PerformNow : Boolean = Standard_True)
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returns Section from BRepAlgo;
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Create(Sh : Shape from TopoDS; Pl : Pln from gp;
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PerformNow : Boolean = Standard_True)
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returns Section from BRepAlgo;
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Create(Sh : Shape from TopoDS; Sf : Surface from Geom;
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PerformNow : Boolean = Standard_True)
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returns Section from BRepAlgo;
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Create(Sf : Surface from Geom; Sh : Shape from TopoDS;
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PerformNow : Boolean = Standard_True)
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returns Section from BRepAlgo;
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Create(Sf1 : Surface from Geom; Sf2 : Surface from Geom;
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PerformNow : Boolean = Standard_True)
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---Purpose: This and the above algorithms construct a framework for computing the section lines of
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-- - the two shapes Sh1 and Sh2, or
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-- - the shape Sh and the plane Pl, or
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-- - the shape Sh and the surface Sf, or
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-- - the surface Sf and the shape Sh, or
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-- - the two surfaces Sf1 and Sf2,
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-- and builds the result if PerformNow equals true, its
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-- default value. If PerformNow equals false, the
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-- intersection will be computed later by the function Build.
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-- The constructed shape will be returned by the
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-- function Shape. This is a compound object
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-- composed of edges. These intersection edges may be built:
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-- - on new intersection lines, or
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-- - on coincident portions of edges in the two intersected shapes.
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-- These intersection edges are independent: they
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-- are not chained or grouped in wires.
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-- If no intersection edge exists, the result is an empty compound object.
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-- Note that other objects than TopoDS_Shape
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-- shapes involved in these syntaxes are converted
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-- into faces or shells before performing the
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-- computation of the intersection. A shape resulting
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-- from this conversion can be retrieved with the
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-- function Shape1 or Shape2.
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-- Parametric 2D curves on intersection edges
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-- No parametric 2D curve (pcurve) is defined for
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-- each elementary edge of the result. To attach such
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-- parametric curves to the constructed edges you
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-- may use a constructor with the PerformNow flag
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-- equal to false; then you use:
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-- - the function ComputePCurveOn1 to ask for the
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-- additional computation of a pcurve in the
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-- parametric space of the first shape,
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-- - the function ComputePCurveOn2 to ask for the
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-- additional computation of a pcurve in the
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-- parametric space of the second shape,
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-- - in the end, the function Build to construct the result.
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-- Note that as a result, pcurves will only be added on
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-- edges built on new intersection lines.
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-- Approximation of intersection edges
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-- The underlying 3D geometry attached to each
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-- elementary edge of the result is:
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-- - analytic where possible, provided the
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-- corresponding geometry corresponds to a type
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-- of analytic curve defined in the Geom package;
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-- for example, the intersection of a cylindrical
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-- shape with a plane gives an ellipse or a circle;
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-- - or elsewhere, given as a succession of points
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-- grouped together in a BSpline curve of degree 1.
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-- If you prefer to have an attached 3D geometry
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-- which is a BSpline approximation of the computed
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-- set of points on computed elementary intersection
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-- edges whose underlying geometry is not analytic,
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-- you may use a constructor with the PerformNow
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-- flag equal to false. Then you use:
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-- - the function Approximation to ask for this
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-- computation option, and
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-- - the function Build to construct the result.
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-- Note that as a result, approximations will only be
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-- computed on edges built on new intersection lines.
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-- Example
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-- You may also combine these computation options.
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-- In the following example:
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-- - each elementary edge of the computed
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-- intersection, built on a new intersection line,
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-- which does not correspond to an analytic Geom
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-- curve, will be approximated by a BSpline curve
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-- whose degree is not greater than 8.
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-- - each elementary edge built on a new intersection line, will have:
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-- - a pcurve in the parametric space of the shape S1,
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-- - no pcurve in the parametric space of the shape S2.
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-- // TopoDS_Shape S1 = ... , S2 = ... ;
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-- Standard_Boolean PerformNow = Standard_False;
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-- BRepAlgo_Section S ( S1, S2, PerformNow );
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-- S.ComputePCurveOn1 (Standard_True);
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-- S.Approximation (Standard_True);
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-- S.Build();
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-- TopoDS_Shape R = S.Shape();
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returns Section from BRepAlgo;
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Init1(me : out;S1 : Shape from TopoDS);
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---Purpose: Initializes the first part
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Init1(me : out;Pl : Pln from gp);
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---Purpose: Initializes the first part
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Init1(me : out;Sf : Surface from Geom);
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---Purpose: Initializes the first part
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Init2(me : out;S2 : Shape from TopoDS);
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---Purpose: initialize second part
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Init2(me : out;Pl : Pln from gp);
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---Purpose: Initializes the second part
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Init2(me : out;Sf : Surface from Geom);
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---Purpose: This and the above algorithms
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-- reinitialize the first and the second parts on which
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-- this algorithm is going to perform the intersection
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-- computation. This is done with either: the surface
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-- Sf, the plane Pl or the shape Sh.
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-- You use the function Build to construct the result.
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Approximation(me : out;B : Boolean);
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---Purpose: Defines an option for computation of further
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--- intersections. This computation will be performed by
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-- the function Build in this framework.
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-- By default, the underlying 3D geometry attached to
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-- each elementary edge of the result of a computed intersection is:
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-- - analytic where possible, provided the
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-- corresponding geometry corresponds to a type of
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-- analytic curve defined in the Geom package; for
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-- example the intersection of a cylindrical shape with
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-- a plane gives an ellipse or a circle;
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-- - or elsewhere, given as a succession of points
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-- grouped together in a BSpline curve of degree 1. If
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-- Approx equals true, when further computations are
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-- performed in this framework with the function
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-- Build, these edges will have an attached 3D
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-- geometry which is a BSpline approximation of the
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-- computed set of points.
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-- Note that as a result, approximations will be computed
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-- on edges built only on new intersection lines.
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ComputePCurveOn1(me : out;B : Boolean);
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---Level: Public
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---Purpose: Indicates if the Pcurve must be (or not) performed on first part.
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ComputePCurveOn2(me : out;B : Boolean);
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---Level: Public
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---Purpose: Define options for the computation of further
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-- intersections which will be performed by the function
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-- Build in this framework.
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-- By default, no parametric 2D curve (pcurve) is defined
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-- for the elementary edges of the result.
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-- If ComputePCurve1 equals true, further computations
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-- performed in this framework with the function Build
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-- will attach an additional pcurve in the parametric
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-- space of the first shape to the constructed edges.
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-- If ComputePCurve2 equals true, the additional pcurve
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-- will be attached to the constructed edges in the
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-- parametric space of the second shape.
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-- These two functions may be used together.
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-- Note that as a result, pcurves will only be added onto
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-- edges built on new intersection lines.
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Build(me : in out)
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---Purpose: Performs the computation of the section lines
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-- between the two parts defined at the time of
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-- construction of this framework or reinitialized with the
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-- Init1 and Init2 functions.
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-- The constructed shape will be returned by the function
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-- Shape. This is a compound object composed of
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-- edges. These intersection edges may be built:
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-- - on new intersection lines, or
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-- - on coincident portions of edges in the two intersected shapes.
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-- These intersection edges are independent: they are
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-- not chained or grouped into wires.
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-- If no intersection edge exists, the result is an empty compound object.
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-- The shapes involved in the construction of the section
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-- lines can be retrieved with the function Shape1 or
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-- Shape2. Note that other objects than
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-- TopoDS_Shape shapes given as arguments at the
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-- construction time of this framework, or to the Init1 or
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-- Init2 function, are converted into faces or shells
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-- before performing the computation of the intersection.
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-- Parametric 2D curves on intersection edges
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-- No parametric 2D curve (pcurve) is defined for the
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-- elementary edges of the result. To attach parametric
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-- curves like this to the constructed edges you have to use:
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-- - the function ComputePCurveOn1 to ask for the
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-- additional computation of a pcurve in the
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-- parametric space of the first shape,
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-- - the function ComputePCurveOn2 to ask for the
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-- additional computation of a pcurve in the
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-- parametric space of the second shape.
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-- This must be done before calling this function.
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-- Note that as a result, pcurves are added on edges
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-- built on new intersection lines only.
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-- Approximation of intersection edges
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-- The underlying 3D geometry attached to each
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-- elementary edge of the result is:
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-- - analytic where possible provided the corresponding
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-- geometry corresponds to a type of analytic curve
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-- defined in the Geom package; for example, the
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-- intersection of a cylindrical shape with a plane
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-- gives an ellipse or a circle; or
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-- - elsewhere, given as a succession of points grouped
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-- together in a BSpline curve of degree 1.
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-- If, on computed elementary intersection edges whose
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-- underlying geometry is not analytic, you prefer to
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-- have an attached 3D geometry which is a BSpline
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-- approximation of the computed set of points, you have
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-- to use the function Approximation to ask for this
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-- computation option before calling this function.
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-- You may also have combined these computation
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-- options: look at the example given above to illustrate
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-- the use of the constructors.
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is redefined static;
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HasAncestorFaceOn1(me; E : Shape from TopoDS;
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F : out Shape from TopoDS)
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returns Boolean;
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---Purpose:Identifies the ancestor faces of the new
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-- intersection edge E resulting from the last
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-- computation performed in this framework, that is,
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-- the faces of the two original shapes on which the edge E lies:
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-- - HasAncestorFaceOn1 gives the ancestor face
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-- in the first shape, and
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-- These functions return:
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-- - true if an ancestor face F is found, or
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-- - false if not.
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-- An ancestor face is identifiable for the edge E if the
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-- three following conditions are satisfied:
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-- - the first part on which this algorithm performed
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-- its last computation is a shape, that is, it was not
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-- given as a surface or a plane at the time of
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-- construction of this algorithm or at a later time by
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-- the Init1 function,
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-- - E is one of the elementary edges built by the last
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-- computation of this section algorithm,
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-- - the edge E is built on an intersection curve. In
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-- other words, E is a new edge built on the
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-- intersection curve, not on edges belonging to the
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-- intersecting shapes.
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-- To use these functions properly, you have to test
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-- the returned Boolean value before using the
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-- ancestor face: F is significant only if the returned
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-- Boolean value equals true.
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HasAncestorFaceOn2(me; E : Shape from TopoDS;
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F : out Shape from TopoDS)
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returns Boolean;
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---Purpose: Identifies the ancestor faces of the new
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-- intersection edge E resulting from the last
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-- computation performed in this framework, that is,
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-- the faces of the two original shapes on which the edge E lies:
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-- - HasAncestorFaceOn2 gives the ancestor face in the second shape.
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-- These functions return:
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-- - true if an ancestor face F is found, or
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-- - false if not.
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-- An ancestor face is identifiable for the edge E if the
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-- three following conditions are satisfied:
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-- - the first part on which this algorithm performed
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-- its last computation is a shape, that is, it was not
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-- given as a surface or a plane at the time of
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-- construction of this algorithm or at a later time by
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-- the Init1 function,
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-- - E is one of the elementary edges built by the last
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-- computation of this section algorithm,
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-- - the edge E is built on an intersection curve. In
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-- other words, E is a new edge built on the
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-- intersection curve, not on edges belonging to the
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-- intersecting shapes.
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-- To use these functions properly, you have to test
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-- the returned Boolean value before using the
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-- ancestor face: F is significant only if the returned
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-- Boolean value equals true.
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InitParameters(me : out)
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---Level: Public
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---Level: Private
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is redefined private;
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fields
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myS1Changed : Boolean;
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myS2Changed : Boolean;
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myApproxChanged : Boolean;
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myPCurve1Changed : Boolean;
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myPCurve2Changed : Boolean;
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myshapeisnull : Boolean;
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end Section;
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