1 // Created on: 1991-05-27
2 // Created by: Arnaud BOUZY
3 // Copyright (c) 1991-1999 Matra Datavision
4 // Copyright (c) 1999-2014 OPEN CASCADE SAS
6 // This file is part of Open CASCADE Technology software library.
8 // This library is free software; you can redistribute it and/or modify it under
9 // the terms of the GNU Lesser General Public License version 2.1 as published
10 // by the Free Software Foundation, with special exception defined in the file
11 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
12 // distribution for complete text of the license and disclaimer of any warranty.
14 // Alternatively, this file may be used under the terms of Open CASCADE
15 // commercial license or contractual agreement.
19 #include <Expr_Absolute.hxx>
20 #include <Expr_GeneralExpression.hxx>
21 #include <Expr_NamedUnknown.hxx>
22 #include <Expr_NotEvaluable.hxx>
23 #include <Expr_NumericValue.hxx>
24 #include <Expr_Operators.hxx>
25 #include <Expr_Product.hxx>
26 #include <Expr_Sign.hxx>
27 #include <Expr_UnaryMinus.hxx>
28 #include <Standard_NumericError.hxx>
29 #include <Standard_Type.hxx>
30 #include <TCollection_AsciiString.hxx>
32 IMPLEMENT_STANDARD_RTTIEXT(Expr_Absolute,Expr_UnaryExpression)
34 Expr_Absolute::Expr_Absolute (const Handle(Expr_GeneralExpression)& exp)
39 Handle(Expr_GeneralExpression) Expr_Absolute::ShallowSimplified () const
41 Handle(Expr_GeneralExpression) op = Operand();
42 if (op->IsKind(STANDARD_TYPE(Expr_NumericValue))) {
43 Handle(Expr_NumericValue) valop = Handle(Expr_NumericValue)::DownCast(op);
44 return new Expr_NumericValue(Abs(valop->GetValue()));
46 if (op->IsKind(STANDARD_TYPE(Expr_UnaryMinus))) {
47 return new Expr_Absolute(op->SubExpression(1));
49 Handle(Expr_Absolute) me = this;
53 Handle(Expr_GeneralExpression) Expr_Absolute::Copy () const
55 return new Expr_Absolute(Expr::CopyShare(Operand()));
58 Standard_Boolean Expr_Absolute::IsIdentical (const Handle(Expr_GeneralExpression)& Other) const
60 if (!Other->IsKind(STANDARD_TYPE(Expr_Absolute))) {
61 return Standard_False;
63 Handle(Expr_GeneralExpression) op = Operand();
64 return op->IsIdentical(Other->SubExpression(1));
67 Standard_Boolean Expr_Absolute::IsLinear () const
69 return !ContainsUnknowns();
72 Handle(Expr_GeneralExpression) Expr_Absolute::Derivative (const Handle(Expr_NamedUnknown)& X) const
74 Handle(Expr_GeneralExpression) op = Operand();
75 Handle(Expr_GeneralExpression) derop = op->Derivative(X);
76 Handle(Expr_Sign) myder = new Expr_Sign(Expr::CopyShare(op));
77 Handle(Expr_Product) resul = myder->ShallowSimplified() * derop;
78 return resul->ShallowSimplified();
82 Standard_Real Expr_Absolute::Evaluate(const Expr_Array1OfNamedUnknown& vars, const TColStd_Array1OfReal& vals) const
84 return ::Abs(Operand()->Evaluate(vars,vals));
87 TCollection_AsciiString Expr_Absolute::String() const
89 TCollection_AsciiString str("Abs(");
90 str += Operand()->String();