1 // Created on: 1994-09-01
2 // Created by: Frederic MAUPAS
3 // Copyright (c) 1994-1999 Matra Datavision
4 // Copyright (c) 1999-2012 OPEN CASCADE SAS
6 // The content of this file is subject to the Open CASCADE Technology Public
7 // License Version 6.5 (the "License"). You may not use the content of this file
8 // except in compliance with the License. Please obtain a copy of the License
9 // at http://www.opencascade.org and read it completely before using this file.
11 // The Initial Developer of the Original Code is Open CASCADE S.A.S., having its
12 // main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France.
14 // The Original Code and all software distributed under the License is
15 // distributed on an "AS IS" basis, without warranty of any kind, and the
16 // Initial Developer hereby disclaims all such warranties, including without
17 // limitation, any warranties of merchantability, fitness for a particular
18 // purpose or non-infringement. Please see the License for the specific terms
19 // and conditions governing the rights and limitations under the License.
21 //:o9 abv 19.02.99: bm4_id_punch_b.stp #678: treatment of ellipse with minR > maxR
22 // NOTE: parametrisation of resulting ellipse shifted on pi/2
24 #include <StepToGeom_MakeEllipse.ixx>
25 #include <StepGeom_Ellipse.hxx>
26 #include <StepGeom_Axis2Placement3d.hxx>
27 #include <Geom_Axis2Placement.hxx>
28 #include <StepToGeom_MakeAxis2Placement.hxx>
30 #include <UnitsMethods.hxx>
32 //=============================================================================
33 // Creation d' un Ellipse de Geom a partir d' un Ellipse de Step
34 //=============================================================================
36 Standard_Boolean StepToGeom_MakeEllipse::Convert
37 (const Handle(StepGeom_Ellipse)& SC,
38 Handle(Geom_Ellipse)& CC)
40 const StepGeom_Axis2Placement AxisSelect = SC->Position();
41 if (AxisSelect.CaseNum(AxisSelect.Value()) == 2) {
42 Handle(Geom_Axis2Placement) A1;
43 if (StepToGeom_MakeAxis2Placement::Convert
44 (Handle(StepGeom_Axis2Placement3d)::DownCast(AxisSelect.Value()),A1))
46 gp_Ax2 A( A1->Ax2() );
47 const Standard_Real LF = UnitsMethods::LengthFactor();
48 const Standard_Real majorR = SC->SemiAxis1() * LF;
49 const Standard_Real minorR = SC->SemiAxis2() * LF;
50 if ( majorR - minorR >= 0. ) { //:o9 abv 19 Feb 99
51 CC = new Geom_Ellipse(A, majorR, minorR);
55 A.SetXDirection ( A.XDirection() ^ A.Direction() );
56 CC = new Geom_Ellipse(A, minorR, majorR);
61 return Standard_False;