From 27c2dc216b7b607be32cd6f057173083d6487f88 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Fri, 11 Feb 2022 17:25:28 +0100
Subject: [PATCH] Part: handle to load old project files with Part::Ellipse

---
 src/Mod/Part/App/PrimitiveFeature.cpp | 25 +++++++++++++++++++++++++
 src/Mod/Part/App/PrimitiveFeature.h   |  4 ++++
 2 files changed, 29 insertions(+)

diff --git a/src/Mod/Part/App/PrimitiveFeature.cpp b/src/Mod/Part/App/PrimitiveFeature.cpp
index a9b9a98a51..572d893a69 100644
--- a/src/Mod/Part/App/PrimitiveFeature.cpp
+++ b/src/Mod/Part/App/PrimitiveFeature.cpp
@@ -1062,3 +1062,28 @@ void Ellipse::onChanged(const App::Property* prop)
     }
     Part::Primitive::onChanged(prop);
 }
+
+void Ellipse::Restore(Base::XMLReader &reader)
+{
+    Base::ObjectStatusLocker<App::Property::Status, App::Property> lock(App::Property::User1, &Angle2, false);
+    Primitive::Restore(reader);
+
+    if (Angle2.testStatus(App::Property::User1)) {
+        double tmp = Angle1.getValue();
+        Angle1.setValue(Angle2.getValue());
+        Angle2.setValue(tmp);
+    }
+}
+
+void Ellipse::handleChangedPropertyName(Base::XMLReader &reader, const char * TypeName, const char *PropName)
+{
+    Base::Type type = Base::Type::fromName(TypeName);
+    if (Angle2.getTypeId() == type && strcmp(PropName, "Angle0") == 0) {
+        Angle2.Restore(reader);
+        // set the flag to swap Angle1/Angle2 afterwards
+        Angle2.setStatus(App::Property::User1, true);
+    }
+    else {
+        Primitive::handleChangedPropertyName(reader, TypeName, PropName);
+    }
+}
diff --git a/src/Mod/Part/App/PrimitiveFeature.h b/src/Mod/Part/App/PrimitiveFeature.h
index cde36e4975..585efd19ef 100644
--- a/src/Mod/Part/App/PrimitiveFeature.h
+++ b/src/Mod/Part/App/PrimitiveFeature.h
@@ -421,6 +421,10 @@ public:
     }
     //@}
 
+protected:
+    void Restore(Base::XMLReader &reader);
+    void handleChangedPropertyName(Base::XMLReader &reader, const char * TypeName, const char *PropName);
+
 private:
     static App::PropertyQuantityConstraint::Constraints angleRange;
 };