D:/Development/Projects/X-Clone/X-Clone/trunk/Terrain.h

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#ifndef XCLONE_TERRAIN_H
#define XCLONE_TERRAIN_H

#include "includes.h"

enum TerrainType { GRASS, WATER };

#define IMPASSABLE_TERRAIN_MULTIPLIER 1000.0

class Terrain
{
   public:
      Terrain(TerrainType type);
      ~Terrain();

      bool isPassable() const;
      TerrainType getType() const;
      double getMoveMultiplier() const;
      void draw(int x, int y) const;
 
   private:
      class TerrainBaseType;

      TerrainBaseType* _type;
      static map<TerrainType, TerrainBaseType*> _possibleTypes;
      static map<TerrainType, SDL_Surface*> _imageMap;
      static int _refCount;

      // inner classes for dealing with TerrainTypes
      class TerrainBaseType
      {
         public:
            virtual ~TerrainBaseType() {}
            virtual bool isPassable() = 0;
            virtual TerrainType getType() = 0;
            virtual double getMoveMultiplier() = 0;
      };

      class TerrainGrass : public TerrainBaseType
      {
         public: 
            virtual bool isPassable() { return true; }
            virtual TerrainType getType() { return GRASS; }
            virtual double getMoveMultiplier() { return 1; }
      };

      class TerrainWater : public TerrainBaseType
      {
         public:
            virtual bool isPassable() { return false; }
            virtual TerrainType getType() { return WATER; }
            virtual double getMoveMultiplier() { return IMPASSABLE_TERRAIN_MULTIPLIER; }
      };
};

#endif

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