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1 | // Copyright: Matra-Datavision 1991 |
| 2 | // File: Expr_Root.cxx |
| 3 | // Created: Tue May 28 12:39:37 1991 |
| 4 | // Author: Arnaud BOUZY |
| 5 | // <adn> |
| 6 | |
| 7 | #include <Expr_SquareRoot.ixx> |
| 8 | #include <Expr_NumericValue.hxx> |
| 9 | #include <Expr_Square.hxx> |
| 10 | #include <Expr_Product.hxx> |
| 11 | #include <Expr_Division.hxx> |
| 12 | #include <Expr_Operators.hxx> |
| 13 | #include <Expr.hxx> |
| 14 | |
| 15 | Expr_SquareRoot::Expr_SquareRoot (const Handle(Expr_GeneralExpression)& exp) |
| 16 | { |
| 17 | CreateOperand(exp); |
| 18 | } |
| 19 | |
| 20 | Handle(Expr_GeneralExpression) Expr_SquareRoot::ShallowSimplified () const |
| 21 | { |
| 22 | Handle(Expr_GeneralExpression) myexp = Operand(); |
| 23 | if (myexp->IsKind(STANDARD_TYPE(Expr_NumericValue))) { |
| 24 | Handle(Expr_NumericValue) myNVexp = Handle(Expr_NumericValue)::DownCast(myexp); |
| 25 | return new Expr_NumericValue(Sqrt(myNVexp->GetValue())); |
| 26 | } |
| 27 | if (myexp->IsKind(STANDARD_TYPE(Expr_Square))) { |
| 28 | return myexp->SubExpression(1); |
| 29 | } |
| 30 | Handle(Expr_SquareRoot) me = this; |
| 31 | return me; |
| 32 | } |
| 33 | |
| 34 | Handle(Expr_GeneralExpression) Expr_SquareRoot::Copy () const |
| 35 | { |
| 36 | return new Expr_SquareRoot(Expr::CopyShare(Operand())); |
| 37 | } |
| 38 | |
| 39 | Standard_Boolean Expr_SquareRoot::IsIdentical (const Handle(Expr_GeneralExpression)& Other) const |
| 40 | { |
| 41 | if (Other->IsKind(STANDARD_TYPE(Expr_SquareRoot))) { |
| 42 | return Operand()->IsIdentical(Other->SubExpression(1)); |
| 43 | } |
| 44 | return Standard_False; |
| 45 | } |
| 46 | |
| 47 | Standard_Boolean Expr_SquareRoot::IsLinear () const |
| 48 | { |
| 49 | return !ContainsUnknowns(); |
| 50 | } |
| 51 | |
| 52 | Handle(Expr_GeneralExpression) Expr_SquareRoot::Derivative (const Handle(Expr_NamedUnknown)& X) const |
| 53 | { |
| 54 | if (!Contains(X)) { |
| 55 | return new Expr_NumericValue(0.0); |
| 56 | } |
| 57 | Handle(Expr_GeneralExpression) myexp = Operand(); |
| 58 | Handle(Expr_GeneralExpression) myder = myexp->Derivative(X); |
| 59 | Handle(Expr_SquareRoot) sq = new Expr_SquareRoot(Expr::CopyShare(myexp)); |
| 60 | Handle(Expr_Product) theprod = 2.0 * sq; |
| 61 | Handle(Expr_Division) resu = myder / theprod->ShallowSimplified(); |
| 62 | return resu->ShallowSimplified(); |
| 63 | } |
| 64 | |
| 65 | |
| 66 | Standard_Real Expr_SquareRoot::Evaluate(const Expr_Array1OfNamedUnknown& vars, const TColStd_Array1OfReal& vals) const |
| 67 | { |
| 68 | return ::Sqrt(Operand()->Evaluate(vars,vals)); |
| 69 | } |
| 70 | |
| 71 | TCollection_AsciiString Expr_SquareRoot::String() const |
| 72 | { |
| 73 | TCollection_AsciiString str("Sqrt("); |
| 74 | str += Operand()->String(); |
| 75 | str += ")"; |
| 76 | return str; |
| 77 | } |
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