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//static const char* sccsid = "@(#)Expr_Tangent.cxx 3.2 95/01/10"; // Do not delete this line. Used by sccs.
// Copyright: Matra-Datavision 1991
// File: Expr_Tangent.cxx
// Created: Tue May 28 14:30:09 1991
// Author: Arnaud BOUZY
// <adn>
#include <Expr_Tangent.ixx>
#include <Expr_NumericValue.hxx>
#include <Expr_ArcTangent.hxx>
#include <Expr_Cosine.hxx>
#include <Expr_Square.hxx>
#include <Expr_Division.hxx>
#include <Expr_Operators.hxx>
#include <Expr.hxx>
Expr_Tangent::Expr_Tangent(const Handle(Expr_GeneralExpression)& exp)
{
CreateOperand(exp);
}
Handle(Expr_GeneralExpression) Expr_Tangent::ShallowSimplified () const
{
Handle(Expr_GeneralExpression) myexp = Operand();
if (myexp->IsKind(STANDARD_TYPE(Expr_NumericValue))) {
Handle(Expr_NumericValue) myNVexp = Handle(Expr_NumericValue)::DownCast(myexp);
return new Expr_NumericValue(Tan(myNVexp->GetValue()));
}
if (myexp->IsKind(STANDARD_TYPE(Expr_ArcTangent))) {
return myexp->SubExpression(1);
}
Handle(Expr_Tangent) me = this;
return me;
}
Handle(Expr_GeneralExpression) Expr_Tangent::Copy () const
{
return new Expr_Tangent(Expr::CopyShare(Operand()));
}
Standard_Boolean Expr_Tangent::IsIdentical (const Handle(Expr_GeneralExpression)& Other) const
{
if (Other->IsKind(STANDARD_TYPE(Expr_Tangent))) {
Handle(Expr_GeneralExpression) myexp = Operand();
return myexp->IsIdentical(Other->SubExpression(1));
}
return Standard_False;
}
Standard_Boolean Expr_Tangent::IsLinear () const
{
return !ContainsUnknowns();
}
Handle(Expr_GeneralExpression) Expr_Tangent::Derivative (const Handle(Expr_NamedUnknown)& X) const
{
if (!Contains(X)) {
return new Expr_NumericValue(0.0);
}
Handle(Expr_GeneralExpression) myexp = Operand();
Handle(Expr_GeneralExpression) myder = myexp->Derivative(X);
Handle(Expr_Cosine) firstder = new Expr_Cosine(Expr::CopyShare(myexp));
Handle(Expr_Square) sq = new Expr_Square(firstder->ShallowSimplified());
Handle(Expr_Division) resu = myder / sq->ShallowSimplified();
return resu->ShallowSimplified();
}
Standard_Real Expr_Tangent::Evaluate(const Expr_Array1OfNamedUnknown& vars, const TColStd_Array1OfReal& vals) const
{
return ::Tan(Operand()->Evaluate(vars,vals));
}
TCollection_AsciiString Expr_Tangent::String() const
{
TCollection_AsciiString str("Tan(");
str += Operand()->String();
str +=")";
return str;
}
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