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_ArcSine.hxx>
20 #include <Expr_GeneralExpression.hxx>
21 #include <Expr_NamedUnknown.hxx>
22 #include <Expr_Operators.hxx>
23 #include <Expr_Sine.hxx>
24 #include <Expr_Square.hxx>
25 #include <Expr_SquareRoot.hxx>
26 #include <Standard_Type.hxx>
27 #include <TCollection_AsciiString.hxx>
29 IMPLEMENT_STANDARD_RTTIEXT(Expr_ArcSine,Expr_UnaryExpression)
31 Expr_ArcSine::Expr_ArcSine (const Handle(Expr_GeneralExpression)& exp)
36 Handle(Expr_GeneralExpression) Expr_ArcSine::ShallowSimplified () const
38 Handle(Expr_GeneralExpression) op = Operand();
39 if (op->IsKind(STANDARD_TYPE(Expr_NumericValue))) {
40 Handle(Expr_NumericValue) valop = Handle(Expr_NumericValue)::DownCast(op);
41 return new Expr_NumericValue(ASin(valop->GetValue()));
43 if (op->IsKind(STANDARD_TYPE(Expr_Sine))) {
44 return op->SubExpression(1);
46 Handle(Expr_ArcSine) me = this;
50 Handle(Expr_GeneralExpression) Expr_ArcSine::Copy () const
52 return new Expr_ArcSine(Expr::CopyShare(Operand()));
55 Standard_Boolean Expr_ArcSine::IsIdentical (const Handle(Expr_GeneralExpression)& Other) const
57 if (!Other->IsKind(STANDARD_TYPE(Expr_ArcSine))) {
58 return Standard_False;
60 Handle(Expr_GeneralExpression) op = Operand();
61 return op->IsIdentical(Other->SubExpression(1));
64 Standard_Boolean Expr_ArcSine::IsLinear () const
66 if (ContainsUnknowns()) {
67 return Standard_False;
72 Handle(Expr_GeneralExpression) Expr_ArcSine::Derivative (const Handle(Expr_NamedUnknown)& X) const
75 return new Expr_NumericValue(0.0);
77 Handle(Expr_GeneralExpression) op = Operand();
78 Handle(Expr_GeneralExpression) derop = op->Derivative(X);
80 Handle(Expr_Square) sq = new Expr_Square(Expr::CopyShare(op));
82 Handle(Expr_Difference) thedif = 1.0 - sq->ShallowSimplified();
85 Handle(Expr_SquareRoot) theroot = new Expr_SquareRoot(thedif->ShallowSimplified());
87 // ArcSine'(F(X)) = F'(X)/sqrt(1-F(X)2)
88 Handle(Expr_Division) thediv = derop / theroot->ShallowSimplified();
90 return thediv->ShallowSimplified();
93 Standard_Real Expr_ArcSine::Evaluate(const Expr_Array1OfNamedUnknown& vars, const TColStd_Array1OfReal& vals) const
95 return ::ASin(Operand()->Evaluate(vars,vals));
98 TCollection_AsciiString Expr_ArcSine::String() const
100 TCollection_AsciiString str("ASin(");
101 str += Operand()->String();