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space_game/SpaceGame/src/objects/object.h

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+#ifndef OBJECT_H
+#define OBJECT_H
+
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+
+#include "../util/rectangle/rectangle.h"
+
+#include "types/asteroid/asteroid.h"
+#include "types/astronaut/astronaut.h"
+#include "types/background/background.h"
+#include "types/spaceship/spaceship.h"
+#include "types/bullet/bullet.h"
+#include "types/heart/heart.h"
+
+#include "prototype.h"
+
+
+// Objects (they could have been called GameObjects) have a simple 
+// hierarchy. A prototype/flyweight motivated system is used.
+// Each type has some common data and methods which are stored
+// in their respective prototype. 
+// This module provides us with the methods to easily and mostly
+// transparently access an object's prototype.
+
+
+typedef union {
+	struct _background_t background;
+	struct _spaceship_t spaceship;
+	struct _astronaut_t astronaut;
+	struct _asteroid_t asteroid;
+	struct _bullet_t bullet;
+	struct _heart_t heart;
+} object_specific_data_t;
+
+struct _object_t {
+	Prototype const* prototype;
+	Vec2 position;
+	object_specific_data_t as;
+};
+
+// Set the prototype of the holder and initialize all the holder's
+// vale to zero. Return the freshly updated holder
+Object* createObject(Prototype const* prototype, Object* holder);
+
+// Call the tick function referenced in the object's prototype
+// on the object itself
+// Object might react to the elapsed time.
+// Does nothing when called with NULL.
+void tickObject(Object* object, uint8_t previousFrameTime);
+
+// Call the draw function referenced in the object's prototype
+// on the object itself.
+// Does nothing when called with NULL.
+void drawObject(Object* object, Rectangle compositingWindow);
+
+// Find out the prototype of the object and return the size of that
+Vec2 getSize(Object const* object);
+Vec2 getSizeFromPrototype(Prototype const* prototype);
+
+// Move the position of the object by a vector
+void move(Object* object, Vec2 value);
+
+// Get a new rectangle from the objects position and its 
+// prototype's size
+Rectangle getBoundingBox(Object const* object);
+
+#endif