1 //static const char* sccsid = "@(#)Expr_Cosine.cxx 3.2 95/01/10"; // Do not delete this line. Used by sccs.
2 // Copyright: Matra-Datavision 1991
3 // File: Expr_Cosine.cxx
4 // Created: Mon May 27 17:24:38 1991
5 // Author: Arnaud BOUZY
8 #include <Expr_Cosine.ixx>
9 #include <Expr_NumericValue.hxx>
10 #include <Expr_ArcCosine.hxx>
11 #include <Expr_Sine.hxx>
12 #include <Expr_UnaryMinus.hxx>
13 #include <Expr_Product.hxx>
14 #include <Expr_Operators.hxx>
17 Expr_Cosine::Expr_Cosine(const Handle(Expr_GeneralExpression)& exp)
22 Handle(Expr_GeneralExpression) Expr_Cosine::ShallowSimplified () const
24 Handle(Expr_GeneralExpression) myexp = Operand();
25 if (myexp->IsKind(STANDARD_TYPE(Expr_NumericValue))) {
26 Handle(Expr_NumericValue) myNVexp = Handle(Expr_NumericValue)::DownCast(myexp);
27 return new Expr_NumericValue(Cos(myNVexp->GetValue()));
29 if (myexp->IsKind(STANDARD_TYPE(Expr_ArcCosine))) {
30 return myexp->SubExpression(1);
32 Handle(Expr_Cosine) me = this;
36 Handle(Expr_GeneralExpression) Expr_Cosine::Copy () const
38 return new Expr_Cosine(Expr::CopyShare(Operand()));
41 Standard_Boolean Expr_Cosine::IsIdentical (const Handle(Expr_GeneralExpression)& Other) const
43 if (Other->IsKind(STANDARD_TYPE(Expr_Cosine))) {
44 Handle(Expr_GeneralExpression) myexp = Operand();
45 return myexp->IsIdentical(Other->SubExpression(1));
47 return Standard_False;
50 Standard_Boolean Expr_Cosine::IsLinear () const
52 return !ContainsUnknowns();
55 Handle(Expr_GeneralExpression) Expr_Cosine::Derivative (const Handle(Expr_NamedUnknown)& X) const
58 return new Expr_NumericValue(0.0);
60 Handle(Expr_GeneralExpression) myexp = Operand();
61 Handle(Expr_GeneralExpression) myder = myexp->Derivative(X);
62 Handle(Expr_Sine) firstder = new Expr_Sine(Expr::CopyShare(myexp));
63 Handle(Expr_UnaryMinus) fder = - (firstder->ShallowSimplified());
64 Handle(Expr_Product) resu = fder->ShallowSimplified() * myder;
65 return resu->ShallowSimplified();
68 Standard_Real Expr_Cosine::Evaluate(const Expr_Array1OfNamedUnknown& vars, const TColStd_Array1OfReal& vals) const
70 return ::Cos(Operand()->Evaluate(vars,vals));
73 TCollection_AsciiString Expr_Cosine::String() const
75 TCollection_AsciiString str("Cos(");
76 str += Operand()->String();