From ab803c7b40ab0bf2a70bad946bdf702ac17a56e5 Mon Sep 17 00:00:00 2001
From: Yorik van Havre <yorik@uncreated.net>
Date: Mon, 29 Aug 2016 19:26:11 -0300
Subject: [PATCH] Added App::PropertyArea (same as PropertyLength but uses Area
 units)

---
 src/App/Application.cpp   |  1 +
 src/App/PropertyUnits.cpp | 13 +++++++++++++
 src/App/PropertyUnits.h   | 12 ++++++++++++
 3 files changed, 26 insertions(+)

diff --git a/src/App/Application.cpp b/src/App/Application.cpp
index 297d9c4c0..372f18902 100644
--- a/src/App/Application.cpp
+++ b/src/App/Application.cpp
@@ -1096,6 +1096,7 @@ void Application::initTypes(void)
     App ::PropertyAngle             ::init();
     App ::PropertyDistance          ::init();
     App ::PropertyLength            ::init();
+    App ::PropertyArea              ::init();
     App ::PropertySpeed             ::init();
     App ::PropertyAcceleration      ::init();
     App ::PropertyForce             ::init();
diff --git a/src/App/PropertyUnits.cpp b/src/App/PropertyUnits.cpp
index 72c9626ab..cb6eeb12f 100644
--- a/src/App/PropertyUnits.cpp
+++ b/src/App/PropertyUnits.cpp
@@ -232,6 +232,19 @@ PropertyLength::PropertyLength()
     setConstraints(&LengthStandard);
 }
 
+//**************************************************************************
+//**************************************************************************
+// PropertyArea
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+TYPESYSTEM_SOURCE(App::PropertyArea, App::PropertyQuantityConstraint);
+
+PropertyArea::PropertyArea()
+{
+    setUnit(Base::Unit::Area);
+    setConstraints(&LengthStandard);
+}
+
 //**************************************************************************
 //**************************************************************************
 // PropertyAngle
diff --git a/src/App/PropertyUnits.h b/src/App/PropertyUnits.h
index 771cc175d..a739f9f48 100644
--- a/src/App/PropertyUnits.h
+++ b/src/App/PropertyUnits.h
@@ -138,6 +138,18 @@ public:
     virtual ~PropertyLength(){}
 };
 
+/** Area property
+ * This is a property for representing areas. It is basically a float
+ * property which must not be negative. On the Gui it has a quantity like m^2 or mm^2.
+ */
+class AppExport PropertyArea : public PropertyQuantityConstraint
+{
+    TYPESYSTEM_HEADER();
+public:
+    PropertyArea(void);
+    virtual ~PropertyArea(){}
+};
+
 /** Angle property
  * This is a property for representing angles. It basicly a float
  * property. On the Gui it has a quantity like RAD.