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//static const char* sccsid = "@(#)Expr_Square.cxx 3.2 95/01/10"; // Do not delete this line. Used by sccs.
// Copyright: Matra-Datavision 1991
// File: Expr_Square.cxx
// Created: Fri Apr 19 10:05:26 1991
// Author: Arnaud BOUZY
// <adn>
#include <Expr_Square.ixx>
#include <Expr_NumericValue.hxx>
#include <Expr_SquareRoot.hxx>
#include <Expr_SequenceOfGeneralExpression.hxx>
#include <Expr_Product.hxx>
#include <Expr_Exponentiate.hxx>
#include <Expr_Operators.hxx>
#include <Expr.hxx>
Expr_Square::Expr_Square (const Handle(Expr_GeneralExpression)& exp)
{
CreateOperand(exp);
}
Handle(Expr_GeneralExpression) Expr_Square::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(Square(myNVexp->GetValue()));
}
if (myexp->IsKind(STANDARD_TYPE(Expr_SquareRoot))) {
return myexp->SubExpression(1);
}
if (myexp->IsKind(STANDARD_TYPE(Expr_Square))) {
Handle(Expr_GeneralExpression) op = myexp->SubExpression(1);
Handle(Expr_NumericValue) val4 = new Expr_NumericValue(4.0);
return new Expr_Exponentiate(op,val4);
}
if (myexp->IsKind(STANDARD_TYPE(Expr_Exponentiate))) {
Handle(Expr_GeneralExpression) op = myexp->SubExpression(1);
Handle(Expr_GeneralExpression) puis = myexp->SubExpression(2);
Handle(Expr_Product) newpuis = 2.0 * puis;
Handle(Expr_Exponentiate) res = new Expr_Exponentiate(op,newpuis->ShallowSimplified());
return res->ShallowSimplified();
}
Handle(Expr_Square) me = this;
return me;
}
Handle(Expr_GeneralExpression) Expr_Square::Copy () const
{
return new Expr_Square(Expr::CopyShare(Operand()));
}
Standard_Boolean Expr_Square::IsIdentical (const Handle(Expr_GeneralExpression)& Other) const
{
if (Other->IsKind(STANDARD_TYPE(Expr_Square))) {
return Operand()->IsIdentical(Other->SubExpression(1));
}
return Standard_False;
}
Standard_Boolean Expr_Square::IsLinear () const
{
return !ContainsUnknowns();
}
Handle(Expr_GeneralExpression) Expr_Square::Derivative (const Handle(Expr_NamedUnknown)& X) const
{
if (!Contains(X)) {
return new Expr_NumericValue(0.0);
}
Handle(Expr_GeneralExpression) myder = Operand();
myder = myder->Derivative(X);
Handle(Expr_NumericValue) coef = new Expr_NumericValue(2.0);
Expr_SequenceOfGeneralExpression ops;
ops.Append(coef);
ops.Append(myder);
Handle(Expr_GeneralExpression) usedop = Expr::CopyShare(Operand());
ops.Append(usedop);
Handle(Expr_Product) resu = new Expr_Product(ops);
return resu->ShallowSimplified();
}
Standard_Real Expr_Square::Evaluate(const Expr_Array1OfNamedUnknown& vars, const TColStd_Array1OfReal& vals) const
{
Standard_Real val = Operand()->Evaluate(vars,vals);
return val*val;
}
TCollection_AsciiString Expr_Square::String() const
{
TCollection_AsciiString str;
Handle(Expr_GeneralExpression) op = Operand();
if (op->NbSubExpressions() > 1) {
str = "(";
str += op->String();
str += ")^2";
}
else {
str = op->String();
str += "^2";
}
return str;
}
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