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91 lines
2.9 KiB
C++
91 lines
2.9 KiB
C++
// Created on: 1991-05-27
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// Created by: Arnaud BOUZY
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// Copyright (c) 1991-1999 Matra Datavision
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// Copyright (c) 1999-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#include <Expr.hxx>
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#include <Expr_Division.hxx>
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#include <Expr_GeneralExpression.hxx>
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#include <Expr_LogOf10.hxx>
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#include <Expr_NamedUnknown.hxx>
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#include <Expr_Operators.hxx>
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#include <Expr_Product.hxx>
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#include <Standard_Type.hxx>
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#include <TCollection_AsciiString.hxx>
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IMPLEMENT_STANDARD_RTTIEXT(Expr_LogOf10,Expr_UnaryExpression)
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Expr_LogOf10::Expr_LogOf10(const Handle(Expr_GeneralExpression)& exp)
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{
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CreateOperand(exp);
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}
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Handle(Expr_GeneralExpression) Expr_LogOf10::ShallowSimplified () const
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{
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Handle(Expr_GeneralExpression) myexp = Operand();
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if (myexp->IsKind(STANDARD_TYPE(Expr_NumericValue))) {
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Handle(Expr_NumericValue) myNVexp = Handle(Expr_NumericValue)::DownCast(myexp);
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return new Expr_NumericValue(Log10(myNVexp->GetValue()));
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}
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Handle(Expr_LogOf10) me = this;
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return me;
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}
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Handle(Expr_GeneralExpression) Expr_LogOf10::Copy () const
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{
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return new Expr_LogOf10(Expr::CopyShare(Operand()));
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}
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Standard_Boolean Expr_LogOf10::IsIdentical (const Handle(Expr_GeneralExpression)& Other) const
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{
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if (Other->IsKind(STANDARD_TYPE(Expr_LogOf10))) {
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Handle(Expr_GeneralExpression) myexp = Operand();
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return myexp->IsIdentical(Other->SubExpression(1));
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}
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return Standard_False;
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}
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Standard_Boolean Expr_LogOf10::IsLinear () const
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{
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return !ContainsUnknowns();
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}
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Handle(Expr_GeneralExpression) Expr_LogOf10::Derivative (const Handle(Expr_NamedUnknown)& X) const
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{
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if (!Contains(X)) {
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return new Expr_NumericValue(0.0);
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}
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Handle(Expr_GeneralExpression) myexp = Operand();
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Handle(Expr_GeneralExpression) myder = myexp->Derivative(X);
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Standard_Real vlog = Log(10.0);
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Handle(Expr_NumericValue) vallog = new Expr_NumericValue(vlog);
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Handle(Expr_Product) theprod = Expr::CopyShare(myexp) * vallog;
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Handle(Expr_Division) thediv = myder / theprod->ShallowSimplified();
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return thediv->ShallowSimplified();
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}
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Standard_Real Expr_LogOf10::Evaluate(const Expr_Array1OfNamedUnknown& vars, const TColStd_Array1OfReal& vals) const
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{
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return ::Log10(Operand()->Evaluate(vars,vals));
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}
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TCollection_AsciiString Expr_LogOf10::String() const
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{
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TCollection_AsciiString str("log(");
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str += Operand()->String();
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str += ")";
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return str;
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}
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