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78 lines
2.2 KiB
C++
Executable File
78 lines
2.2 KiB
C++
Executable File
// Copyright: Matra-Datavision 1991
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// File: Expr_Root.cxx
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// Created: Tue May 28 12:39:37 1991
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// Author: Arnaud BOUZY
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// <adn>
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#include <Expr_SquareRoot.ixx>
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#include <Expr_NumericValue.hxx>
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#include <Expr_Square.hxx>
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#include <Expr_Product.hxx>
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#include <Expr_Division.hxx>
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#include <Expr_Operators.hxx>
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#include <Expr.hxx>
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Expr_SquareRoot::Expr_SquareRoot (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_SquareRoot::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(Sqrt(myNVexp->GetValue()));
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}
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if (myexp->IsKind(STANDARD_TYPE(Expr_Square))) {
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return myexp->SubExpression(1);
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}
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Handle(Expr_SquareRoot) me = this;
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return me;
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}
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Handle(Expr_GeneralExpression) Expr_SquareRoot::Copy () const
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{
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return new Expr_SquareRoot(Expr::CopyShare(Operand()));
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}
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Standard_Boolean Expr_SquareRoot::IsIdentical (const Handle(Expr_GeneralExpression)& Other) const
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{
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if (Other->IsKind(STANDARD_TYPE(Expr_SquareRoot))) {
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return Operand()->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_SquareRoot::IsLinear () const
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{
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return !ContainsUnknowns();
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}
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Handle(Expr_GeneralExpression) Expr_SquareRoot::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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Handle(Expr_SquareRoot) sq = new Expr_SquareRoot(Expr::CopyShare(myexp));
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Handle(Expr_Product) theprod = 2.0 * sq;
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Handle(Expr_Division) resu = myder / theprod->ShallowSimplified();
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return resu->ShallowSimplified();
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}
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Standard_Real Expr_SquareRoot::Evaluate(const Expr_Array1OfNamedUnknown& vars, const TColStd_Array1OfReal& vals) const
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{
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return ::Sqrt(Operand()->Evaluate(vars,vals));
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}
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TCollection_AsciiString Expr_SquareRoot::String() const
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{
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TCollection_AsciiString str("Sqrt(");
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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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