Base: Add surface charge density unit

src/App/Application.cpp

@@ -2060,6 +2060,7 @@ void Application::initTypes()
     App::PropertyElectricalInductance       ::init();
     App::PropertyElectricalResistance       ::init();
     App::PropertyElectricCharge             ::init();
+    App::PropertySurfaceChargeDensity       ::init();
     App::PropertyElectricCurrent            ::init();
     App::PropertyElectricPotential          ::init();
     App::PropertyElectromagneticPotential   ::init();

src/App/PropertyUnits.cpp

@@ -392,6 +392,17 @@ PropertyElectricCharge::PropertyElectricCharge()
     setUnit(Base::Unit::ElectricCharge);
 }
 
+//**************************************************************************
+// PropertySurfaceChargeDensity
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+TYPESYSTEM_SOURCE(App::PropertySurfaceChargeDensity, App::PropertyQuantity)
+
+PropertySurfaceChargeDensity::PropertySurfaceChargeDensity()
+{
+    setUnit(Base::Unit::SurfaceChargeDensity);
+}
+
 //**************************************************************************
 // PropertyElectricCurrent
 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

src/App/PropertyUnits.h

@@ -361,6 +361,19 @@ public:
     ~PropertyElectricCharge() override = default;
 };
 
+/** SurfaceChargeDensity property
+ * This is a property for representing surface charge density. It is basically a float
+ * property. On the Gui it has a quantity like C/m^2.
+ */
+class AppExport PropertySurfaceChargeDensity: public PropertyQuantity
+{
+    TYPESYSTEM_HEADER_WITH_OVERRIDE();
+
+public:
+    PropertySurfaceChargeDensity();
+    ~PropertySurfaceChargeDensity() override = default;
+};
+
 /** ElectricCurrent property
  * This is a property for representing electric currents. It is basically a
  * float property. On the Gui it has a quantity like A.