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89 lines
2.4 KiB
C++
Executable File
89 lines
2.4 KiB
C++
Executable File
//static const char* sccsid = "@(#)Expr_ArcTangent.cxx 3.2 95/01/10"; // Do not delete this line. Used by sccs.
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// Copyright: Matra-Datavision 1991
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// File: Expr_ArcTangent.cxx
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// Created: Mon May 27 11:44:23 1991
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// Author: Arnaud BOUZY
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// <adn>
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#include <Expr_ArcTangent.ixx>
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#include <Expr_NumericValue.hxx>
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#include <Expr_Tangent.hxx>
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#include <Expr_Division.hxx>
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#include <Expr_Square.hxx>
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#include <Expr_Sum.hxx>
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#include <Expr_Operators.hxx>
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#include <Expr.hxx>
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Expr_ArcTangent::Expr_ArcTangent (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_ArcTangent::ShallowSimplified () const
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{
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Handle(Expr_GeneralExpression) op = Operand();
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if (op->IsKind(STANDARD_TYPE(Expr_NumericValue))) {
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Handle(Expr_NumericValue) valop = Handle(Expr_NumericValue)::DownCast(op);
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return new Expr_NumericValue(ATan(valop->GetValue()));
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}
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if (op->IsKind(STANDARD_TYPE(Expr_Tangent))) {
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return op->SubExpression(1);
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}
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Handle(Expr_ArcTangent) me = this;
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return me;
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}
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Handle(Expr_GeneralExpression) Expr_ArcTangent::Copy () const
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{
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return new Expr_ArcTangent(Expr::CopyShare(Operand()));
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}
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Standard_Boolean Expr_ArcTangent::IsIdentical (const Handle(Expr_GeneralExpression)& Other) const
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{
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if (!Other->IsKind(STANDARD_TYPE(Expr_ArcTangent))) {
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return Standard_False;
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}
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Handle(Expr_GeneralExpression) op = Operand();
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return op->IsIdentical(Other->SubExpression(1));
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}
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Standard_Boolean Expr_ArcTangent::IsLinear () const
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{
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if (ContainsUnknowns()) {
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return Standard_False;
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}
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return Standard_True;
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}
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Handle(Expr_GeneralExpression) Expr_ArcTangent::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) op = Operand();
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Handle(Expr_GeneralExpression) derop = op->Derivative(X);
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Handle(Expr_Square) sq = new Expr_Square(Expr::CopyShare(op));
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// 1 + X2
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Handle(Expr_Sum) thesum = 1.0 + sq->ShallowSimplified();
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// ArcTangent'(F(X)) = F'(X)/(1+F(X)2)
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Handle(Expr_Division) thediv = derop / thesum->ShallowSimplified();
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return thediv->ShallowSimplified();
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}
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Standard_Real Expr_ArcTangent::Evaluate(const Expr_Array1OfNamedUnknown& vars, const TColStd_Array1OfReal& vals) const
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{
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return ::ATan(Operand()->Evaluate(vars,vals));
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}
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TCollection_AsciiString Expr_ArcTangent::String() const
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{
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TCollection_AsciiString str("ATan(");
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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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