Part: add Offset2D feature

derived from Part::Offset, to re-use task dialog easily

src/Mod/Part/App/AppPart.cpp

@@ -301,6 +301,7 @@ PyMODINIT_FUNC initPart()
     Part::Loft                  ::init();
     Part::Sweep                 ::init();
     Part::Offset                ::init();
+    Part::Offset2D              ::init();
     Part::Thickness             ::init();
 
     // Geometry types

src/Mod/Part/App/FeatureOffset.cpp

@@ -93,3 +93,52 @@ App::DocumentObjectExecReturn *Offset::execute(void)
 }
 
 
+//-------------------------------------------------------------------------------------------------------
+
+
+PROPERTY_SOURCE(Part::Offset2D, Part::Offset)
+
+Offset2D::Offset2D()
+{
+    this->SelfIntersection.setStatus(App::Property::Status::Hidden, true);
+    this->Mode.setValue(1); //switch to Pipe mode by default, because skin mode does not function properly on closed profiles.
+}
+
+Offset2D::~Offset2D()
+{
+
+}
+
+short Offset2D::mustExecute() const
+{
+    if (Source.isTouched())
+        return 1;
+    if (Value.isTouched())
+        return 1;
+    if (Mode.isTouched())
+        return 1;
+    if (Join.isTouched())
+        return 1;
+    if (Fill.isTouched())
+        return 1;
+    if (Intersection.isTouched())
+        return 1;
+    return 0;
+}
+
+App::DocumentObjectExecReturn *Offset2D::execute(void)
+{
+    App::DocumentObject* source = Source.getValue();
+    if (!(source && source->getTypeId().isDerivedFrom(Part::Feature::getClassTypeId())))
+        return new App::DocumentObjectExecReturn("No source shape linked.");
+    double offset = Value.getValue();
+    short mode = (short)Mode.getValue();
+    short join = (short)Join.getValue();
+    bool fill = Fill.getValue();
+    bool inter = Intersection.getValue();
+    if (mode == 2)
+        return new App::DocumentObjectExecReturn("Mode 'Recto-Verso' is not supported for 2D offset.");
+    const TopoShape& shape = static_cast<Part::Feature*>(source)->Shape.getShape();
+    this->Shape.setValue(shape.makeOffset2D(offset, join, fill, mode == 0, inter));
+    return App::DocumentObject::StdReturn;
+}

src/Mod/Part/App/FeatureOffset.h

@@ -61,5 +61,23 @@ private:
     static const char* JoinEnums[];
 };
 
+class PartExport Offset2D : public Offset
+{
+    PROPERTY_HEADER(Part::Offset2D);
+public:
+    Offset2D();
+    ~Offset2D();
+
+    /** @name methods override feature */
+    //@{
+    /// recalculate the feature
+    virtual App::DocumentObjectExecReturn *execute(void) override;
+    virtual short mustExecute() const override;
+    virtual const char* getViewProviderName(void) const override {
+        return "PartGui::ViewProviderOffset2D";
+    }
+    //@}
+};
+
 }
 #endif // PART_FEATUREOFFSET_H

src/Mod/Part/Gui/AppPartGui.cpp

@@ -150,6 +150,7 @@ PyMODINIT_FUNC initPartGui()
     PartGui::ViewProviderLoft               ::init();
     PartGui::ViewProviderSweep              ::init();
     PartGui::ViewProviderOffset             ::init();
+    PartGui::ViewProviderOffset2D           ::init();
     PartGui::ViewProviderThickness          ::init();
     PartGui::ViewProviderCustom             ::init();
     PartGui::ViewProviderCustomPython       ::init();

src/Mod/Part/Gui/ViewProviderMirror.cpp

@@ -581,6 +581,11 @@ bool ViewProviderOffset::onDelete(const std::vector<std::string> &)
     return true;
 }
 
+// ---------------------------------------
+
+PROPERTY_SOURCE(PartGui::ViewProviderOffset2D, PartGui::ViewProviderOffset)
+
+
 // ---------------------------------------
 
 PROPERTY_SOURCE(PartGui::ViewProviderThickness, PartGui::ViewProviderPart)

src/Mod/Part/Gui/ViewProviderMirror.h

@@ -163,6 +163,16 @@ protected:
     virtual void unsetEdit(int ModNum);
 };
 
+class ViewProviderOffset2D : public ViewProviderOffset
+{
+    PROPERTY_HEADER(PartGui::ViewProviderOffset2D);
+
+public:
+    ViewProviderOffset2D(){
+        sPixmap = "Part_Offset2D";
+    }
+};
+
 class ViewProviderThickness : public ViewProviderPart
 {
     PROPERTY_HEADER(PartGui::ViewProviderThickness);