Add christmas edition

christmas/AdAstra/src/objects/object_container/object_container.h

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+#ifndef OBJECT_HANDLER_H
+#define OBJECT_HANDLER_H
+
+#include <stdbool.h>
+#include <avr/io.h>
+
+#include "null.h"
+
+#include "../object.h"
+#include "../../util/rectangle/rectangle.h"
+#include "../../util/vec2/vec2.h"
+
+
+// Contain up to OBJECT_COUNT objects.
+// Provide the basic functionality to access, search and modify
+// these objects.
+// For ease of use, there are some convenience global variables for accessing
+// objects that are very commonly accessed.
+
+#define OBJECT_COUNT 10
+#define BACKGROUND_INDEX 0
+#define SPACESHIP_INDEX 1
+#define CHARACTER_INDEX 2
+
+#define spaceshipObject (objects + SPACESHIP_INDEX)
+#define character (objects + CHARACTER_INDEX)
+
+// The actual container
+Object objects[OBJECT_COUNT];
+
+// may return NULL
+Object* getFirstOfType(Prototype const* type);
+// may return NULL
+#define getEmptyObjectSpace() getFirstOfType(NULL)
+
+// Return the number of objects with a prototype being type
+uint8_t getCountOf(Prototype const* type);
+
+// Return a reference to a random object intersecting boundingBox and having 
+// a prototype of type
+Object* getIntersectingObjectOfType(Rectangle boundingBox, Prototype const* type);
+
+// Call the tick method of every object
+// objects might respond to the elapsed time
+void tickObjects(uint8_t previousFrameTime);
+
+// Call the draw method of every object
+void drawObjects(Rectangle window);
+
+// Delete the object given by its address from objects
+// It achieves this by setting the object's prototype to NULL.
+void clearObject(Object* object);
+
+// Delete every object inside of objects 
+// and create (or load) the starting objects
+void initializeObjectContainer();
+
+#endif