Sketcher: Shape to NURBS conversion

src/Mod/Sketcher/App/SketchObject.cpp

@@ -3766,6 +3766,43 @@ int SketchObject::DeleteUnusedInternalGeometry(int GeoId, bool delgeoid)
     }
 }
 
+bool SketchObject::ConvertToNURBS(int GeoId)
+{
+    if (GeoId < 0 || GeoId > getHighestCurveIndex())
+        return -1;
+
+    const Part::Geometry *geo = getGeometry(GeoId);
+
+    if(geo->getTypeId() == Part::GeomPoint::getClassTypeId())
+        return -1;
+
+    const Part::GeomCurve *geo1 = static_cast<const Part::GeomCurve *>(geo);
+
+    Part::GeomBSplineCurve* bspline;
+    
+    try {
+         bspline = geo1->toNurbs(geo1->getFirstParameter(), geo1->getLastParameter());
+    }
+    catch (const Base::Exception& e) {
+        Base::Console().Error("%s\n", e.what());
+        // revert to original values
+        return false;
+    }
+
+    const std::vector< Part::Geometry * > &vals = getInternalGeometry();
+
+    std::vector< Part::Geometry * > newVals(vals);
+
+    newVals[GeoId] = bspline;
+
+    Geometry.setValues(newVals);
+    Constraints.acceptGeometry(getCompleteGeometry());
+    rebuildVertexIndex();
+    
+    return true;
+
+}
+
 int SketchObject::addExternal(App::DocumentObject *Obj, const char* SubName)
 {
     // so far only externals to the support of the sketch and datum features

src/Mod/Sketcher/App/SketchObject.h

@@ -196,6 +196,8 @@ public:
      \retval int - returns -1 on error, otherwise the number of deleted elements
      */
     int DeleteUnusedInternalGeometry(int GeoId, bool delgeoid=false);
+    
+    bool ConvertToNURBS(int GeoId);
 
     /// retrieves for a Vertex number the corresponding GeoId and PosId
     void getGeoVertexIndex(int VertexId, int &GeoId, PointPos &PosId) const;

src/Mod/Sketcher/Gui/CommandSketcherBSpline.cpp

@@ -296,7 +296,63 @@ bool CmdSketcherCompBSplineShowHideGeometryInformation::isActive(void)
     return isSketcherBSplineActive( getActiveGuiDocument(), false );
 }
 
+// Convert to NURB
+DEF_STD_CMD_A(CmdSketcherConvertToNURB);
 
+CmdSketcherConvertToNURB::CmdSketcherConvertToNURB()
+:Command("Sketcher_BSplineConvertToNURB")
+{
+    sAppModule      = "Sketcher";
+    sGroup          = QT_TR_NOOP("Sketcher");
+    sMenuText       = QT_TR_NOOP("Convert Geometry to B-Spline");
+    sToolTipText    = QT_TR_NOOP("Converts the given Geometry to a B-Spline");
+    sWhatsThis      = "Sketcher_ConvertToNURB";
+    sStatusTip      = sToolTipText;
+    sPixmap         = "Sketcher_ConvertToNURB";
+    sAccel          = "";
+    eType           = ForEdit;
+}
+
+void CmdSketcherConvertToNURB::activated(int iMsg)
+{
+    Q_UNUSED(iMsg);
+    
+    // get the selection
+    std::vector<Gui::SelectionObject> selection = getSelection().getSelectionEx();
+    
+    // only one sketch with its subelements are allowed to be selected
+    if (selection.size() != 1) {
+        return;
+    }
+    
+    // get the needed lists and objects
+    const std::vector<std::string> &SubNames = selection[0].getSubNames();
+    Sketcher::SketchObject* Obj = static_cast<Sketcher::SketchObject*>(selection[0].getObject());
+    
+    for (unsigned int i=0; i<SubNames.size(); i++ ) {
+        // only handle edges
+        if (SubNames[i].size() > 4 && SubNames[i].substr(0,4) == "Edge") {
+            
+            int GeoId = std::atoi(SubNames[i].substr(4,4000).c_str()) - 1;
+    
+            Obj->ConvertToNURBS(GeoId);
+        }
+    }
+    
+    ParameterGrp::handle hGrp = App::GetApplication().GetParameterGroupByPath("User parameter:BaseApp/Preferences/Mod/Sketcher");
+    bool autoRecompute = hGrp->GetBool("AutoRecompute",false);
+    
+    if (autoRecompute)
+        Gui::Command::updateActive();
+    else
+        Obj->solve();
+    
+}
+
+bool CmdSketcherConvertToNURB::isActive(void)
+{
+    return isSketcherBSplineActive( getActiveGuiDocument(), false );
+}
 
 
 void CreateSketcherCommandsBSpline(void)
@@ -307,4 +363,5 @@ void CreateSketcherCommandsBSpline(void)
     rcCmdMgr.addCommand(new CmdSketcherBSplinePolygon());
     rcCmdMgr.addCommand(new CmdSketcherBSplineComb());
     rcCmdMgr.addCommand(new CmdSketcherCompBSplineShowHideGeometryInformation());
+    rcCmdMgr.addCommand(new CmdSketcherConvertToNURB());
 }

src/Mod/Sketcher/Gui/Workbench.cpp

@@ -285,12 +285,14 @@ template <>
 inline void SketcherAddWorkbenchBSplines<Gui::MenuItem>(Gui::MenuItem& bspline){
     bspline << "Sketcher_BSplineDegree"
         << "Sketcher_BSplinePolygon"
-        << "Sketcher_BSplineComb";
+        << "Sketcher_BSplineComb"
+        << "Sketcher_BSplineConvertToNURB";
 }
 
 template <>
 inline void SketcherAddWorkbenchBSplines<Gui::ToolBarItem>(Gui::ToolBarItem& bspline){
-    bspline << "Sketcher_CompBSplineShowHideGeometryInformation";
+    bspline << "Sketcher_CompBSplineShowHideGeometryInformation"
+    << "Sketcher_BSplineConvertToNURB";
 }
 
 template <typename T>