29 The Power of Inheritance and Polymorphism

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Inheritance and Polymorphism 1062Movement in samedirectionMovement in similardirectionPick new direction atrandom}// Try to keep going in much the same direction as last timeif((fLastX != 0) || (fLastY != 0)) {int newx = x + fLastX;int newy = y + fLastY;if(fD->Accessible(Pt(newx,newy))) {Move(Pt(newx,newy));return;}elseif(fD->Accessible(Pt(newx,y))) {Move(Pt(newx,y)); fLastY = 0;return;}elseif(fD->Accessible(Pt(x,newy))) {Move(Pt(x,newy)); fLastX= 0;return; }}int dir = rand();dir = dir % 9;dir++;Pt p = Step(dir);x += p.X();y += p.Y();if(fD->Accessible(Pt(x,y))) {fLastX = p.X();fLastY = p.Y();Move(Pt(x,y));}PatrolThe patrol route has to be read, consequently the inherited Read() function mustbe extended. There are several possible errors in route definitions, so Patrol::Read() involves many checks:void Patrol::Read(ifstream& in){Monster::Read(in);fRoute[0] = fPos;fNdx = 0;fDelta = 1;in >> fRouteLen;for(int i=1; i> x >> y;Pt p(x, y);if(!fD->ValidPoint(p)) {cout
Implementation: DungeonItems 1063}if(!p.Adjacent(fRoute[i-1])) {cout
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Page 50: EXERCISES1 Complete and run the dun

29 The Power of Inheritance and Polymorphism

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