Changeset 2194 in orxonox.OLD for orxonox/branches/chris

Timestamp:

Jul 18, 2004, 12:03:57 PM (20 years ago)

Author:

chris

Message:

orxonox/branches/chris: Implemented is_a() query for WorldEntities

Location:

orxonox/branches/chris/src

Files:

• player.cc (modified) (3 diffs)
• player.h (modified) (3 diffs)
• world_entity.cc (modified) (2 diffs)
• world_entity.h (modified) (2 diffs)

orxonox/branches/chris/src/player.cc

@@ -22 +22 @@
 using namespace std;
 
+// initialize the pointers used for is_a identification
+bool (*Player::basefunc)(char*) = WorldEntity::is_a;
+char *Player::is = "Player";
 
 Player::Player(bool isFree) : WorldEntity(isFree)
@@ -88 +91 @@
         glEnd();
         
+        printf("Player is a Player: %d\n", is_a("Player"));
+        printf("Player is a WorldEntity: %d\n", is_a("WorldEntity"));
+        printf("Player is a Banana: %d\n", is_a("Banana"));
         printf("Player@%f/%f/%f\n", get_placement()->r.x, get_placement()->r.y, get_placement()->r.z);
 }
@@ -128 +134 @@
 }
 
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
+bool Player::is_a(char* name)
+{
+        if( !strcmp( name, is)) return true;
+        else return basefunc (name);
+}

orxonox/branches/chris/src/player.h

@@ -18 +18 @@
   ~Player ();
 
+        static bool is_a(char* name);
+
         virtual void post_spawn ();
   virtual void tick (float time);
@@ -24 +26 @@
   virtual void collide (WorldEntity* other,  Uint32 ownhitflags, Uint32 otherhitflags);
         virtual void command (Command* cmd);
-  
+   
   virtual void draw ();
   virtual void get_lookat (Location* locbuf);
@@ -31 +33 @@
 
  private:
+        static bool (*basefunc)(char*);
+  static char *is;
+
         bool bUp, bDown, bLeft, bRight, bAscend, bDescend;
         bool bFire;

orxonox/branches/chris/src/world_entity.cc

@@ -23 +23 @@
 
 using namespace std;
+
+// initialize the pointers used for is_a identification
+bool (*WorldEntity::basefunc)(char*) = WorldEntity::is_none;
+char *WorldEntity::is = "WorldEntity";
 
 /**
@@ -183 +187 @@
 */
 void WorldEntity::left_world () {}
+
+/**
+        \brief this method can be used to determine what type of WorldEntity a particular pointer represents at runtime
+        \param name: a string specifying the type (use the name of the class)
+        \return true if the entity is in fact of that type or a derivation thereof false if the entity is not related to the specifiead type
+
+        Since this funtion is declared static, it has to be redeclaed and reimplemented in every derivation of WorldEntity, but since it is written
+        very generally you just have to copy paste this function and initialize the two static is_a variables (basefunc and is) correctly.
+        Note that these have to be redeclared as well or you will get a compiler error.
+*/
+bool WorldEntity::is_a (char* name)
+{
+        if( !strcmp( name, is)) return true;
+        else return basefunc (name);
+}
+
+/**
+        \brief basefunc of WorldEntity
+        \param name: not relevant
+        \return false
+        
+        dummy is_a() implementation that returns false only
+*/
+bool WorldEntity::is_none (char* name)
+{
+        return false;
+}

orxonox/branches/chris/src/world_entity.h

@@ -25 +25 @@
 
         bool isFree ();
+
+        static bool is_a(char* name);
         
   //void addAbility(Ability* ability);
@@ -35 +37 @@
   virtual void collide (WorldEntity* other,  Uint32 ownhitflags, Uint32 otherhitflags);
         virtual void command (Command* cmd);
-  
+    
   virtual void draw ();
   virtual void get_lookat (Location* locbuf);
 
         virtual void left_world ();
-
+        
  private:
+        static bool is_none (char* name);       
+        static bool (*basefunc)(char*);
+        static char *is;
+ 
   const bool bFree;     
   bool bCollide;