fixes 0003020: 2D offset of circle are not in the right place

2019-01-26 22:51:29 +01:00
parent b5d576f465
commit cc1bb80f24
4 changed files with 289 additions and 8 deletions
--- a/src/Mod/Part/App/BRepOffsetAPI_MakeOffsetFix.h
+++ b/src/Mod/Part/App/BRepOffsetAPI_MakeOffsetFix.h
@@ -0,0 +1,85 @@
+/***************************************************************************
+ *   Copyright (c) 2019 Werner Mayer <wmayer[at]users.sourceforge.net>     *
+ *                                                                         *
+ *   This file is part of the FreeCAD CAx development system.              *
+ *                                                                         *
+ *   This library is free software; you can redistribute it and/or         *
+ *   modify it under the terms of the GNU Library General Public           *
+ *   License as published by the Free Software Foundation; either          *
+ *   version 2 of the License, or (at your option) any later version.      *
+ *                                                                         *
+ *   This library  is distributed in the hope that it will be useful,      *
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
+ *   GNU Library General Public License for more details.                  *
+ *                                                                         *
+ *   You should have received a copy of the GNU Library General Public     *
+ *   License along with this library; see the file COPYING.LIB. If not,    *
+ *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
+ *   Suite 330, Boston, MA  02111-1307, USA                                *
+ *                                                                         *
+ ***************************************************************************/
+
+
+#ifndef PART_BREPOFFSETAPI_MAKEOFFSETFIX_H
+#define PART_BREPOFFSETAPI_MAKEOFFSETFIX_H
+
+#include <BRepOffsetAPI_MakeOffset.hxx>
+#include <list>
+#include <map>
+
+namespace Part {
+/*!
+ * \brief The BRepOffsetAPI_MakeOffsetFix class
+ * This class works around a limitation of the BRepOffsetAPI_MakeOffset which
+ * returns unexpected results when an input wire has set a placement and consists
+ * of a single edge only.
+ */
+class PartExport BRepOffsetAPI_MakeOffsetFix : public BRepBuilderAPI_MakeShape
+{
+public:
+    BRepOffsetAPI_MakeOffsetFix();
+    BRepOffsetAPI_MakeOffsetFix(const GeomAbs_JoinType Join, const Standard_Boolean IsOpenResult);
+    virtual ~BRepOffsetAPI_MakeOffsetFix();
+
+    //! Initializes the algorithm to construct parallels to the wire Spine.
+    void AddWire (const TopoDS_Wire& Spine);
+
+    //! Computes a parallel to the spine at distance Offset and
+    //! at an altitude Alt from the plane of the spine in relation
+    //! to the normal to the spine.
+    //! Exceptions: StdFail_NotDone if the offset is not built.
+    void Perform (const Standard_Real Offset, const Standard_Real Alt = 0.0);
+
+    //! Builds the resulting shape (redefined from MakeShape).
+    void Build();
+
+    virtual Standard_Boolean IsDone() const;
+
+    //! Returns a shape built by the shape construction algorithm.
+    //! Raises exception StdFail_NotDone if the shape was not built.
+    virtual const TopoDS_Shape& Shape();
+
+    //! returns a list of the created shapes
+    //! from the shape <S>.
+    virtual const TopTools_ListOfShape& Generated (const TopoDS_Shape& S) Standard_OVERRIDE;
+
+    //! Returns the list  of shapes modified from the shape
+    //! <S>.
+    virtual const TopTools_ListOfShape& Modified (const TopoDS_Shape& S);
+
+    //! Returns true if the shape S has been deleted.
+    virtual Standard_Boolean IsDeleted (const TopoDS_Shape& S);
+
+private:
+    void MakeWire(TopoDS_Shape&);
+
+private:
+    BRepOffsetAPI_MakeOffset mkOffset;
+    std::list<std::pair<TopoDS_Shape, TopLoc_Location> > myLocations;
+    TopoDS_Shape myResult;
+};
+
+}
+
+#endif // PART_BREPOFFSETAPI_MAKEOFFSETFIX_H