Bugfix in MoverRelative.

Old code was "undoing" offsets other than their own, so stacking
multiple movers was broken.

src/mover.hpp

@@ -14,7 +14,7 @@ namespace cloonel {
 		Mover ( void ) = default;
 		virtual ~Mover ( void ) noexcept = default;
 
-		void Update ( float parDelta );
+		virtual void Update ( float parDelta );
 		PlaceableTicketType RegisterPlaceable ( Placeable* parPlaceable ) { return m_placeables.Add(parPlaceable); }
 		void UnregisterPlaceable ( PlaceableTicketType parID ) noexcept { m_placeables.Remove(parID); }
 

src/moverrelative.cpp

@@ -2,10 +2,24 @@
 #include "placeable.hpp"
 
 namespace cloonel {
+	///--------------------------------------------------------------------------
+	///--------------------------------------------------------------------------
+	MoverRelative::MoverRelative() :
+		m_prevOffset(0.0f)
+	{
+	}
+
 	///--------------------------------------------------------------------------
 	///--------------------------------------------------------------------------
 	void MoverRelative::UpdateSingle (Placeable* parPlaceable) {
-		const float2 newPos(GetOffset() - parPlaceable->GetPos());
-		parPlaceable->AddOffset(newPos);
+		const float2 offs(GetOffset() - m_prevOffset);
+		parPlaceable->AddOffset(offs);
+	}
+
+	///--------------------------------------------------------------------------
+	///--------------------------------------------------------------------------
+	void MoverRelative::Update (float parDelta) {
+		m_prevOffset = GetOffset();
+		Mover::Update(parDelta);
 	}
 } //namespace cloonel

src/moverrelative.hpp

@@ -6,12 +6,17 @@
 namespace cloonel {
 	class MoverRelative : public Mover {
 	public:
-		MoverRelative ( void ) = default;
+		MoverRelative ( void );
 		virtual ~MoverRelative ( void ) noexcept = default;
 
+		virtual void Update ( float parDelta );
+
 	protected:
 		virtual void UpdateSingle ( Placeable* parPlaceable );
 		virtual float2 GetOffset ( void ) const = 0;
+
+	private:
+		float2 m_prevOffset;
 	};
 } //namespace cloonel