Preparazione controllo visibilità collezioni

src/collections/headers/collection_interface.hpp

@@ -11,10 +11,17 @@ struct collection{
 
 
 class CollectionInterface{
+    protected:
+        float transparency = 1.0;
+        bool isVisible = true;
     public:
         virtual collection create(ReferencePlane plane) = 0;
         virtual void update(sf::Clock cl, float multiplier) = 0;
         virtual bool setTransparency(float alpha) = 0; 
+        float getTransparency() {
+            return transparency;
+        }
+        virtual bool setVisibility(bool c);
         virtual ~CollectionInterface(){};
 };