29 The Power of Inheritance and Polymorphism

Finalising the clases 1033intprivate:intintintintvoidvoidvoidClearLineOfSight(Pt p1, Pt p2, int max,Pt path[]);ClearRow(Pt p1, Pt p2, int max, Pt path[]);ClearColumn(Pt p1, Pt p2, int max, Pt path[]);ClearSemiVertical(Pt p1, Pt p2, int max,Pt path[]);ClearSemiHorizontal(Pt p1, Pt p2, int max,Pt path[]);LoadMap(ifstream& in);PopulateDungeon(ifstream& in);CreateWindow();};DynamicArrayDynamicArrayPlayercharWindowintintfProps;fInhabitants;*fPlayer;fDRep[MAXHEIGHT][MAXWIDTH];*fDWindow;fHeight;fWidth;The Dungeon object owns the map of the maze (represented by its data elementsfDRep[][], fHeight, and fWidth). It also owns the main map window(fDWindow), the Player object (fPlayer) and the collections of Monsters andCollectables. Data members that are instances of class DynamicArray are usedfor the collections (fInhabitants for the Monsters, fProps for theCollectables).The Load() and Run() functions are used by the main program. FunctionLoad() makes uses of the auxiliary private member functions LoadMap() andPopulateDungeon(); these read the various data and create Monster,Collectable, and Player object(s) as specified by the input. The auxiliary privatemember function CreateWindow() is called from Run(); it creates the mainwindow used for the map and sets its background from information in the map.Access functions like Display() and Human() allow other objects to getpointers to the main window and the Player object. The ActiveItem objects thatmove are going to need access to the main Window so as to tell it to clear and setthe character that is to appear at a particular point.The ValidPoint() function checks whether a given Pt is within the bounds ofthe maze and is not a "wall".The functions M_at_Pt() and PI_at_Pt() involve searches through thecollections of Monsters and Collectables respectively. These function return thefirst member of the collection present at a Pt (or NULL if there are no objects at thatPt). The Remove… function eliminate members of the collections.Class Dungeon has been given responsibility for checking whether a "clear lineof sight" exists between two Pts (this function is called in both Wanderer::CanDetect() and Patrol::CanDetect()). The function takes as arguments thetwo points, a maximum range and a Pt array in which to return the Pts along theWhat does aDungeon own?What does aDungeon do?