From cb3c463261b2037387a62aec0dc855cab1541330 Mon Sep 17 00:00:00 2001
From: Tamir Atias <engine.games@gmail.com>
Date: Sat, 14 Jan 2012 06:44:23 +0200
Subject: [PATCH] [Add] Player can now attack NPCs.

---
 src/Unuk/Game.cpp                   | 12 +++++--
 src/Unuk/Player.cpp                 |  2 ++
 src/libUnuk/Engine/Character.h      | 12 ++++---
 src/libUnuk/Engine/WorldManager.cpp | 50 +++++++++++++++++++++++++++++
 src/libUnuk/Engine/WorldManager.h   |  5 +++
 5 files changed, 75 insertions(+), 6 deletions(-)

diff --git a/src/Unuk/Game.cpp b/src/Unuk/Game.cpp
index a77a186..546bd7d 100644
--- a/src/Unuk/Game.cpp
+++ b/src/Unuk/Game.cpp
@@ -50,7 +50,7 @@ gameNavVal_t Game::Run(const string savegameIDArg) {
 
   stringstream npcHealth;
   _npcHealth.SetXY(10, 100);
-  _npcHealth.SetTextBlended("NPC Health - XX", vsmall, COLOUR_BLACK);
+  _npcHealth.SetTextBlended("NPC 0 Health - XX", vsmall, COLOUR_BLACK);
 
   _gameRunning = true;
   while(_gameRunning) {
@@ -103,8 +103,16 @@ gameNavVal_t Game::Run(const string savegameIDArg) {
         playerHealth << "Player Health: " << _player->GetHealth();
         _playerHealth.SetTextBlended(playerHealth.str(), vsmall, COLOUR_BLACK);
 
+        int npc0Health = 0;
+        if(_map.GetWorld().GetNPCCount() == 0) {
+          npc0Health = 0;
+        }
+        else {
+          npc0Health = _map.GetWorld().GetNPC(0)->GetHealth();
+        }
+
         npcHealth.str("");
-        npcHealth << "NPC Health: " << _map.GetWorld().GetNPC(0)->GetHealth();
+        npcHealth << "NPC 0 Health: " << npc0Health;
         _npcHealth.SetTextBlended(npcHealth.str(), vsmall, COLOUR_BLACK);
       }
     }
diff --git a/src/Unuk/Player.cpp b/src/Unuk/Player.cpp
index f4b5be2..2f9a99b 100644
--- a/src/Unuk/Player.cpp
+++ b/src/Unuk/Player.cpp
@@ -41,6 +41,7 @@ void Player::HandleInput(void) {
     case SDLK_SPACE:
       attacking = true;
       attackTimer.Start();
+      map->GetWorld().OnPlayerAttack(this);
       break;
     default:
       break;
@@ -59,6 +60,7 @@ void Player::HandleInput(void) {
     if(event.button.button == SDL_BUTTON_LEFT) {
       attacking = true;
       attackTimer.Start();
+      map->GetWorld().OnPlayerAttack(this);
     }
   }
 }
diff --git a/src/libUnuk/Engine/Character.h b/src/libUnuk/Engine/Character.h
index 10c5e70..acedfbe 100644
--- a/src/libUnuk/Engine/Character.h
+++ b/src/libUnuk/Engine/Character.h
@@ -36,6 +36,9 @@ public:
   void SetHealth(int health)          { _health = health; }
   int GetHealth(void)                 { return _health; }
   
+  int  GetDirectionFacing(void)        { return directionFacing; }
+  void SetDirectionFacing(int dir)     { directionFacing = dir;  }
+
   void AddSpeachBubble(string text);
 
   void Render(void);
@@ -56,6 +59,11 @@ public:
   inline void operator delete [](void* object) {
     gMemManager.Free(object);
   }
+
+  static const int FACING_UP     = 0;
+  static const int FACING_RIGHT  = 1;
+  static const int FACING_DOWN   = 2;
+  static const int FACING_LEFT   = 3;
   
 protected:
   void Move(void);
@@ -85,10 +93,6 @@ protected:
   static const float CHARACTER_SPEED;
   
   int directionFacing;
-  static const int FACING_UP     = 0;
-  static const int FACING_RIGHT  = 1;
-  static const int FACING_DOWN   = 2;
-  static const int FACING_LEFT   = 3;
   
   static const int ANIM_LEFT_FOOT    = 0;
   static const int ANIM_NO_FOOT      = 1;
diff --git a/src/libUnuk/Engine/WorldManager.cpp b/src/libUnuk/Engine/WorldManager.cpp
index af23a6b..a39b965 100644
--- a/src/libUnuk/Engine/WorldManager.cpp
+++ b/src/libUnuk/Engine/WorldManager.cpp
@@ -52,3 +52,53 @@ NPC* WorldManager::GetNPC(int index) {
   }
   return NULL;
 }
+
+void WorldManager::OnPlayerAttack(Character* player) {
+  int playerX = (int)(player->GetX() / 32.0f);
+  int playerY = (int)(player->GetY() / 32.0f);
+  int playerDir = player->GetDirectionFacing();
+
+  std::list<NPC*>::iterator i = _npcs.begin();
+
+  while(i != _npcs.end()) {
+    NPC* npc = (*i);
+
+    int npcX = (int)(npc->GetX() / 32.0f);
+    int npcY = (int)(npc->GetY() / 32.0f);
+
+    int diffX = npcX - playerX;
+    int diffY = npcY - playerY;
+
+    // Not in player's line of sight.
+    if(diffX != 0 && diffY != 0) {
+      ++i;
+      continue;
+    }
+
+    // Distance is greater than 2.
+    if(diffX > 2 || diffY > 2) {
+      ++i;
+      continue;
+    }
+
+    // Player not facing the npc.
+    if((diffX < 0 && playerDir != Character::FACING_LEFT)   || 
+       (diffX > 0 && playerDir != Character::FACING_RIGHT)  ||
+       (diffY < 0 && playerDir != Character::FACING_UP)     ||
+       (diffY > 0 && playerDir != Character::FACING_DOWN))
+    {
+      ++i;
+      continue;
+    }
+
+    npc->SetHealth(npc->GetHealth() - 5);
+
+    if(npc->GetHealth() <= 0) {
+      i = _npcs.erase(i);
+      delete npc;
+    }
+    else {
+      ++i;
+    }
+  }
+}
diff --git a/src/libUnuk/Engine/WorldManager.h b/src/libUnuk/Engine/WorldManager.h
index 466571c..001b0f9 100644
--- a/src/libUnuk/Engine/WorldManager.h
+++ b/src/libUnuk/Engine/WorldManager.h
@@ -2,6 +2,7 @@
 #include <list>
 
 class NPC;
+class Character;
 
 class WorldManager {
 public:
@@ -15,6 +16,10 @@ public:
   void RemoveNPC(int index);
   NPC* GetNPC(int index);
 
+  int  GetNPCCount() { return _npcs.size(); }
+
+  void OnPlayerAttack(Character* player);
+
 private:
   std::list<NPC*> _npcs;
 };