Integration of OCCT 6.5.0 from SVN

src/Expr/Expr_ArcTangent.cxx

@@ -0,0 +1,88 @@
+//static const char* sccsid = "@(#)Expr_ArcTangent.cxx	3.2 95/01/10"; // Do not delete this line. Used by sccs.
+// Copyright: 	Matra-Datavision 1991
+// File:	Expr_ArcTangent.cxx
+// Created:	Mon May 27 11:44:23 1991
+// Author:	Arnaud BOUZY
+//		<adn>
+
+
+#include <Expr_ArcTangent.ixx>
+#include <Expr_NumericValue.hxx>
+#include <Expr_Tangent.hxx>
+#include <Expr_Division.hxx>
+#include <Expr_Square.hxx>
+#include <Expr_Sum.hxx>
+#include <Expr_Operators.hxx>
+#include <Expr.hxx>
+
+Expr_ArcTangent::Expr_ArcTangent (const Handle(Expr_GeneralExpression)& exp)
+{
+  CreateOperand(exp);
+}
+
+Handle(Expr_GeneralExpression) Expr_ArcTangent::ShallowSimplified () const
+{
+  Handle(Expr_GeneralExpression) op = Operand();
+  if (op->IsKind(STANDARD_TYPE(Expr_NumericValue))) {
+    Handle(Expr_NumericValue) valop = Handle(Expr_NumericValue)::DownCast(op);
+    return new Expr_NumericValue(ATan(valop->GetValue()));
+  }
+  if (op->IsKind(STANDARD_TYPE(Expr_Tangent))) {
+    return op->SubExpression(1);
+  }
+  Handle(Expr_ArcTangent) me = this;
+  return me;
+}
+
+Handle(Expr_GeneralExpression) Expr_ArcTangent::Copy () const 
+{
+  return  new Expr_ArcTangent(Expr::CopyShare(Operand()));
+}
+
+Standard_Boolean Expr_ArcTangent::IsIdentical (const Handle(Expr_GeneralExpression)& Other) const
+{
+  if (!Other->IsKind(STANDARD_TYPE(Expr_ArcTangent))) {
+    return Standard_False;
+  }
+  Handle(Expr_GeneralExpression) op = Operand();
+  return op->IsIdentical(Other->SubExpression(1));
+}
+
+Standard_Boolean Expr_ArcTangent::IsLinear () const
+{
+  if (ContainsUnknowns()) {
+    return Standard_False;
+  }
+  return Standard_True;
+}
+
+Handle(Expr_GeneralExpression) Expr_ArcTangent::Derivative (const Handle(Expr_NamedUnknown)& X) const
+{
+  if (!Contains(X)) {
+    return new Expr_NumericValue(0.0);
+  }
+  Handle(Expr_GeneralExpression) op = Operand();
+  Handle(Expr_GeneralExpression) derop = op->Derivative(X);
+
+  Handle(Expr_Square) sq = new Expr_Square(Expr::CopyShare(op));
+  // 1 + X2
+  Handle(Expr_Sum) thesum = 1.0 + sq->ShallowSimplified();
+
+  // ArcTangent'(F(X)) = F'(X)/(1+F(X)2) 
+  Handle(Expr_Division) thediv = derop / thesum->ShallowSimplified(); 
+
+  return thediv->ShallowSimplified();
+}
+
+Standard_Real Expr_ArcTangent::Evaluate(const Expr_Array1OfNamedUnknown& vars, const TColStd_Array1OfReal& vals) const
+{
+  return ::ATan(Operand()->Evaluate(vars,vals));
+}
+
+TCollection_AsciiString Expr_ArcTangent::String() const
+{
+  TCollection_AsciiString str("ATan(");
+  str += Operand()->String();
+  str += ")";
+  return str;
+}