chore: bump verssion to alpha-0.1.0

include/game/BaseGame.h

@@ -19,7 +19,7 @@ typedef std::map<std::uint8_t, Player> PlayerList;
 class Game {
 protected:
     World* m_World;
-    std::array<Team, 2> m_Teams = { Team{TeamColor::Red}, Team{TeamColor::Blue} };
+    TeamList m_Teams = { Team{TeamColor::Red}, Team{TeamColor::Blue} };
     GameState m_GameState = GameState::Lobby;
     PlayerList m_Players;
 public:
@@ -46,8 +46,10 @@ public:
     const PlayerList& getPlayers() const { return m_Players; }
     PlayerList& getPlayers() { return m_Players; }
 
-    const Player& getPlayerById(PlayerID id) const { return m_Players.find(id)->second; }
-    Player& getPlayerById(PlayerID id) { return m_Players.find(id)->second; }
+    const Player* getPlayerById(PlayerID id) const;
+    Player* getPlayerById(PlayerID id);
+
+    const TeamList& getTeams() const { return m_Teams; }
 
 };
 

include/game/Mobs.h

@@ -2,13 +2,20 @@
 
 #include "Towers.h"
 #include "Types.h"
+#include "Team.h"
+
+#include "misc/ObjectNotifier.h"
 
 #include <vector>
 #include <memory>
 
+#include <glm/glm.hpp>
+
 namespace td {
 namespace game {
 
+struct WalkableTile;
+
 enum class EffectType : std::uint8_t {
     Slowness = 0,
     Stun,
@@ -41,37 +48,39 @@ class MobStats {
 private:
     float m_Damage;
     float m_Speed;
+    glm::vec2 m_Size;
     std::uint16_t m_MoneyCost;
     std::uint16_t m_ExpCost;
     std::uint16_t m_MaxLife;
     std::uint16_t m_ExpReward;
 public:
-    MobStats(float damage, float speed, std::uint16_t moneyCost,
+    MobStats(float damage, float speed, glm::vec2 size, std::uint16_t moneyCost,
         std::uint16_t expCost, std::uint16_t expReward,
         std::uint16_t maxLife) : m_Damage(damage), m_Speed(speed),
-        m_MoneyCost(moneyCost), m_ExpCost(expCost), m_MaxLife(maxLife),
-        m_ExpReward(expReward) {
+        m_Size(size), m_MoneyCost(moneyCost), m_ExpCost(expCost),
+        m_MaxLife(maxLife), m_ExpReward(expReward) {
     }
 
     float getDamage() const { return m_Damage; }
     float getMovementSpeed() const { return m_Speed; }
+    const glm::vec2& getSize() const { return m_Size; }
     std::uint16_t getMoneyCost() const { return m_MoneyCost; }
     std::uint16_t getExpCost() const { return m_ExpCost; }
     std::uint16_t getExpReward() const { return m_ExpReward; }
     std::uint16_t getMaxLife() const { return m_MaxLife; }
 };
 
-struct EffectDuration{
+struct EffectDuration {
     EffectType type;
     float duration; // in seconds
-    const Tower* tower; // the tower that gived the effect
+    Tower* tower; // the tower that gived the effect
 };
 
 const MobStats* getMobStats(MobType type, std::uint8_t level);
 const TowerImmunities& getMobTowerImmunities(MobType type, std::uint8_t level);
 const EffectImmunities& getMobEffectImmunities(MobType type, std::uint8_t level);
 
-class Mob {
+class Mob : public utils::shape::Rectangle {
 protected:
     float m_Health;
 private:
@@ -80,24 +89,27 @@ private:
     MobLevel m_Level;
     Direction m_Direction;
     std::vector<EffectDuration> m_Effects;
-    const Tower* m_LastDamage;   // the tower that damaged the mob
+    const Tower* m_LastDamage;   // the last tower that damaged the mob
 
     utils::Timer m_EffectFireTimer;
     utils::Timer m_EffectPoisonTimer;
     utils::Timer m_EffectHealTimer;
 
-    float m_X = 0, m_Y = 0;
+    TeamCastle* m_CastleTarget;
+    utils::CooldownTimer m_AttackTimer;
+
 public:
     Mob(MobID id, MobLevel level, PlayerID sender) : m_Sender(sender), m_Level(level),
-        m_EffectFireTimer(1000), m_EffectPoisonTimer(1000), m_EffectHealTimer(1000) {
+        m_EffectFireTimer(1000), m_EffectPoisonTimer(1000),
+        m_EffectHealTimer(1000), m_CastleTarget(nullptr), m_AttackTimer(1000) {
 
     }
 
     virtual MobType getType() const = 0;
 
-    virtual void tick(std::uint64_t delta);
+    virtual void tick(std::uint64_t delta, World* world);
 
-    virtual void OnDeath(World* world){}
+    virtual bool OnDeath(World* world) { return true; }
 
     const TowerImmunities& getTowerImmunities() const { return getMobTowerImmunities(getType(), m_Level); }
     const EffectImmunities& getEffectImmunities() const { return getMobEffectImmunities(getType(), m_Level); }
@@ -108,29 +120,36 @@ public:
     bool isDead() const { return m_Health <= 0; }
     bool isAlive() const { return m_Health > 0; }
     const Tower* getLastDamageTower() { return m_LastDamage; }
+    bool hasReachedEnemyCastle() { return m_CastleTarget != nullptr; }
 
     void damage(float dmg, const Tower* damager) { m_Health = std::max(0.0f, m_Health - dmg); m_LastDamage = damager; }
-    void heal(float heal) { m_Health = std::min((float)getStats()->getMaxLife(), m_Health + heal); }
-
-    float getX() const { return m_X; }
-    void setX(float x) { m_X = x; }
-
-    float getY() const { return m_Y; }
-    void setY(float y) { m_Y = y; }
+    void heal(float heal) { m_Health = std::min(static_cast<float>(getStats()->getMaxLife()), m_Health + heal); }
+    void setMobReachedCastle(TeamCastle* castle) { m_CastleTarget = castle; } // used when mob is in front of the castle
 
     bool isImmuneTo(TowerType type);
 
     bool isImmuneTo(EffectType type);
-    void addEffect(EffectType type, float durationSec, const Tower* tower);
+    void addEffect(EffectType type, float durationSec, Tower* tower);
     bool hasEffect(EffectType type);
 
+    float getTileX() { return getCenterX() - static_cast<float>(static_cast<std::int32_t>(getCenterX())); } // returns a float between 0 and 1 excluded
+    float getTileY() { return getCenterY() - static_cast<float>(static_cast<std::int32_t>(getCenterY())); } // returns a float between 0 and 1 excluded
 
     Direction getDirection() const { return m_Direction; }
     void setDirection(Direction dir) { m_Direction = dir; }
 protected:
-    void initHealth() { m_Health = (float)getStats()->getMaxLife(); }
+    void initMob() {
+        m_Health = static_cast<float>(getStats()->getMaxLife());
+        setSize(getStats()->getSize().x, getStats()->getSize().y);
+    }
 private:
-    void updateEffects(std::uint64_t delta);
+    void updateEffects(std::uint64_t delta, World* world);
+    void attackCastle(std::uint64_t delta, World* world);
+    void move(std::uint64_t delta, World* world);
+    void walk(std::uint64_t delta, World* world);
+    void moveBack(const TeamCastle& castle, World* world);
+    void changeDirection(const WalkableTile& tile, World* world);
+    bool isTouchingCastle(const TeamCastle& castle) const;
     EffectDuration& getEffect(EffectType type);
 };
 
@@ -138,70 +157,70 @@ typedef std::shared_ptr<Mob> MobPtr;
 
 class Zombie : public Mob {
 public:
-    Zombie(MobID id, std::uint8_t level, PlayerID sender) : Mob(id, level, sender) { initHealth(); }
+    Zombie(MobID id, std::uint8_t level, PlayerID sender) : Mob(id, level, sender) { initMob(); }
 
     virtual MobType getType() const { return MobType::Zombie; }
 };
 
 class Spider : public Mob {
 public:
-    Spider(MobID id, std::uint8_t level, PlayerID sender) : Mob(id, level, sender) { initHealth(); }
+    Spider(MobID id, std::uint8_t level, PlayerID sender) : Mob(id, level, sender) { initMob(); }
 
     virtual MobType getType() const { return MobType::Spider; }
 };
 
 class Skeleton : public Mob {
 public:
-    Skeleton(MobID id, std::uint8_t level, PlayerID sender) : Mob(id, level, sender) { initHealth(); }
+    Skeleton(MobID id, std::uint8_t level, PlayerID sender) : Mob(id, level, sender) { initMob(); }
 
     virtual MobType getType() const { return MobType::Skeleton; }
 };
 
 class PigMan : public Mob {
 public:
-    PigMan(MobID id, std::uint8_t level, PlayerID sender) : Mob(id, level, sender) { initHealth(); }
+    PigMan(MobID id, std::uint8_t level, PlayerID sender) : Mob(id, level, sender) { initMob(); }
 
     virtual MobType getType() const { return MobType::Pigman; }
 };
 
 class Creeper : public Mob {
 public:
-    Creeper(MobID id, std::uint8_t level, PlayerID sender) : Mob(id, level, sender) { initHealth(); }
+    Creeper(MobID id, std::uint8_t level, PlayerID sender) : Mob(id, level, sender) { initMob(); }
 
     virtual MobType getType() const { return MobType::Creeper; }
 };
 
 class Silverfish : public Mob {
 public:
-    Silverfish(MobID id, std::uint8_t level, PlayerID sender) : Mob(id, level, sender) { initHealth(); }
+    Silverfish(MobID id, std::uint8_t level, PlayerID sender) : Mob(id, level, sender) { initMob(); }
 
     virtual MobType getType() const { return MobType::Silverfish; }
 };
 
 class Blaze : public Mob {
 public:
-    Blaze(MobID id, std::uint8_t level, PlayerID sender) : Mob(id, level, sender) { initHealth(); }
+    Blaze(MobID id, std::uint8_t level, PlayerID sender) : Mob(id, level, sender) { initMob(); }
 
     virtual MobType getType() const { return MobType::Blaze; }
 };
 
 class Witch : public Mob {
 public:
-    Witch(MobID id, std::uint8_t level, PlayerID sender) : Mob(id, level, sender) { initHealth(); }
+    Witch(MobID id, std::uint8_t level, PlayerID sender) : Mob(id, level, sender) { initMob(); }
 
     virtual MobType getType() const { return MobType::Witch; }
 };
 
 class Slime : public Mob {
 public:
-    Slime(MobID id, std::uint8_t level, PlayerID sender) : Mob(id, level, sender) { initHealth(); }
+    Slime(MobID id, std::uint8_t level, PlayerID sender) : Mob(id, level, sender) { initMob(); }
 
     virtual MobType getType() const { return MobType::Slime; }
 };
 
 class Giant : public Mob {
 public:
-    Giant(MobID id, std::uint8_t level, PlayerID sender) : Mob(id, level, sender) { initHealth(); }
+    Giant(MobID id, std::uint8_t level, PlayerID sender) : Mob(id, level, sender) { initMob(); }
 
     virtual MobType getType() const { return MobType::Giant; }
 };
@@ -211,6 +230,18 @@ MobPtr createMob(MobID id, MobType type, std::uint8_t level, PlayerID sender);
 std::string getMobName(MobType type);
 }
 
+class MobListener {
+public:
+    virtual void OnMobSpawn(Mob* mob) {}
+    virtual void OnMobDie(Mob* mob) {}
+
+    virtual void OnMobDamage(Mob* target, float damage, Tower* damager) {}
+
+    virtual void OnMobTouchCastle(Mob* damager, TeamCastle* enemyCastle) {}
+    virtual void OnMobCastleDamage(Mob* damager, TeamCastle* enemyCastle, float damage) {}
+};
+
+typedef utils::ObjectNotifier<MobListener> MobNotifier;
 
 } // namespace game
 } // namespace td

include/game/Player.h

@@ -34,7 +34,7 @@ public:
     std::uint8_t getGoldPerSecond() const { return m_GoldPerSecond; }
     void setGoldPerSecond(std::uint8_t goldPerSecond) { m_GoldPerSecond = goldPerSecond; }
 
-    std::uint32_t getGold() const { return m_Gold;}
+    std::uint32_t getGold() const { return m_Gold; }
     void setGold(std::uint32_t gold) { m_GoldChanged = true; m_Gold = gold; }
     void addGold(std::uint32_t gold) { m_GoldChanged = true; m_Gold += gold; }
     void removeGold(std::uint32_t gold) { m_GoldChanged = true; m_Gold -= gold; }

include/game/Team.h

@@ -2,9 +2,11 @@
 
 #include "Types.h"
 
+#include "misc/Shapes.h"
+
 #include <vector>
 #include <memory>
-#include <algorithm>
+#include <cmath>
 
 namespace td {
 namespace game {
@@ -17,14 +19,48 @@ enum class TeamColor : std::int8_t {
     Blue
 };
 
-struct Spawn {
-    Direction direction;
-    std::int32_t x, y;
+class Spawn : public utils::shape::Rectangle {
+private:
+    Direction m_Direction;
+public:
+    Spawn() {
+        setWidth(5);
+        setHeight(5);
+    }
+
+    Direction getDirection() const { return m_Direction; }
+
+    void setDirection(Direction direction) { m_Direction = direction; }
 };
 
-struct TeamCastle {
-    std::int32_t x, y;
-    std::uint16_t life = 1000;
+class Team;
+
+class TeamCastle : public utils::shape::Rectangle {
+private:
+    const Team* m_Team;
+    float m_Life;
+public:
+    static constexpr int CastleMaxLife = 1000;
+
+    TeamCastle(const Team* team) : m_Team(team), m_Life(CastleMaxLife) {
+        setWidth(5);
+        setHeight(5);
+    }
+
+    TeamCastle() : TeamCastle(nullptr) {}
+
+    float getLife() const { return m_Life; }
+
+    const Team* getTeam() const { return m_Team; }
+    void setTeam(const Team* team) { m_Team = team; }
+
+    void setLife(float life) { m_Life = life; }
+    void damage(float damage) { m_Life = std::max(0.0f, m_Life - damage); }
+
+    void setShape(utils::shape::Rectangle rect) {
+        setCenter(rect.getCenter());
+        setSize(rect.getSize());
+    }
 };
 
 class Team {
@@ -50,5 +86,7 @@ public:
     std::uint8_t getPlayerCount() const;
 };
 
+typedef std::array<Team, 2> TeamList;
+
 } // namespace game
 } // namespace td

include/game/Towers.h

@@ -5,6 +5,8 @@
 #include <memory>
 
 #include "misc/Time.h"
+#include "misc/Shapes.h"
+
 #include "game/Types.h"
 
 namespace td {
@@ -85,19 +87,18 @@ const TowerStats* getTowerStats(TowerType type, TowerLevel level);
 
 typedef std::uint16_t TowerID;
 
-class Tower {
+class Tower : public utils::shape::Circle {
 private:
     TowerID m_ID;
     TowerType m_Type;
-    std::int32_t m_X, m_Y;
     TowerLevel m_Level{};
     PlayerID m_Builder;
 protected:
     utils::CooldownTimer m_Timer;
 public:
-    Tower(TowerID id, TowerType type, std::int32_t x, std::int32_t y, PlayerID builder) : m_ID(id), m_Type(type), m_X(x), m_Y(y), m_Builder(builder),
+    Tower(TowerID id, TowerType type, std::int32_t x, std::int32_t y, PlayerID builder) : utils::shape::Circle(x + 0.5f, y + 0.5f, 0), m_ID(id), m_Type(type), m_Builder(builder),
         m_Timer(getStats()->getDamageRate() * 1000) { // converting seconds to millis
-
+        setRadius(getStats()->getRange());
     }
 
     virtual TowerType getType() const = 0;
@@ -109,11 +110,10 @@ public:
         m_Level.setPath(path);
         m_Timer.setCooldown(getStats()->getDamageRate() * 1000); // converting seconds to millis
         m_Timer.reset();
+        setRadius(getStats()->getRange());
     }
 
     std::uint16_t getID() const { return m_ID; }
-    std::int32_t getX() const { return m_X; }
-    std::int32_t getY() const { return m_Y; }
     const TowerLevel& getLevel() const { return m_Level; }
     const TowerStats* getStats() const { return getTowerStats(m_Type, m_Level); }
     PlayerID getBuilder() const { return m_Builder; }
@@ -163,6 +163,9 @@ class ArcherTower : public LittleTower {
 public:
     ArcherTower(TowerID id, std::uint16_t x, std::uint16_t y, PlayerID builder) : LittleTower(id, getType(), x, y, builder) {}
 
+    constexpr static float ExplosionRadius = 1.5f;
+    constexpr static float FireDurationSec = 10.0f;
+
     virtual TowerType getType() const { return TowerType::Archer; }
     virtual void tick(std::uint64_t delta, World* world);
 };

include/game/World.h

@@ -114,7 +114,22 @@ typedef std::array<Color, 2> SpawnColorPalette;
 
 typedef std::vector<TowerPtr> TowerList;
 
-class World {
+class WorldListener {
+public:
+    WorldListener() {}
+
+    virtual void OnTowerAdd(TowerPtr tower) {}
+    virtual void OnTowerRemove(TowerPtr tower) {}
+
+    virtual void OnArcherTowerShot(MobPtr target, ArcherTower* shooter) {}
+
+    virtual void OnArrowShot(MobPtr target, bool fire, Tower* shooter) {}
+    virtual void OnExplosion(utils::shape::Circle explosion, float centerDamage, Tower* shooter) {}
+};
+
+typedef utils::ObjectNotifier<WorldListener> WorldNotifier;
+
+class World : public WorldListener, public MobListener {
 protected:
     TowerTileColorPalette m_TowerPlacePalette;
     Color m_WalkablePalette;
@@ -131,9 +146,14 @@ protected:
     TowerList m_Towers;
 
     Game* m_Game;
+
+    WorldNotifier m_WorldNotifier;
+    MobNotifier m_MobNotifier;
 public:
     World(Game* game);
 
+    static constexpr std::uint8_t CastleWidth = 5, CastleHeight = 5;
+
     bool loadMap(const protocol::WorldBeginDataPacket* worldHeader);
     bool loadMap(const protocol::WorldDataPacket* worldData);
 
@@ -145,6 +165,7 @@ public:
     void spawnMobAt(MobID id, MobType type, std::uint8_t level, PlayerID sender, float x, float y, Direction dir);
 
     TowerPtr placeTowerAt(TowerID id, TowerType type, std::int32_t x, std::int32_t y, PlayerID builder);
+    TowerPtr removeTower(TowerID id);
 
     TilePtr getTile(std::int32_t x, std::int32_t y) const;
 
@@ -184,13 +205,30 @@ public:
     Team& getTeam(TeamColor team);
     const Team& getTeam(TeamColor team) const;
 
+    const TeamList& getTeams() const;
+
     const TowerList& getTowers() const { return m_Towers; };
     TowerPtr getTowerById(TowerID tower);
 
-    // Archer Tower
-    virtual void OnArrowShot(MobPtr target, Tower* shooter);
+    const Player* getPlayerById(PlayerID id) const;
+
+    WorldNotifier& getWorldNotifier() { return m_WorldNotifier; }
+    MobNotifier& getMobNotifier() { return m_MobNotifier; }
+
+    // WorldListener
+
+    virtual void OnArcherTowerShot(MobPtr target, ArcherTower* shooter);
+
+    virtual void OnArrowShot(MobPtr target, bool fire, Tower* shooter);
+    virtual void OnExplosion(utils::shape::Circle explosion, float centerDamage, Tower* shooter);
+
+    // MobListener
+
+    virtual void OnMobDamage(Mob* target, float damage, Tower* source);
+    virtual void OnMobDie(Mob* mob);
+    virtual void OnMobCastleDamage(Mob* damager, TeamCastle* enemyCastle, float damage);
+
 private:
-    void moveMobs(std::uint64_t delta);
     void tickMobs(std::uint64_t delta);
     void cleanDeadMobs();
 };

include/game/client/Client.h

@@ -44,6 +44,7 @@ public:
     void sendMobs(const std::vector<protocol::MobSend>& mobSends);
     void placeTower(game::TowerType type, const glm::vec2& position);
     void upgradeTower(game::TowerID tower, game::TowerLevel level);
+    void removeTower(game::TowerID tower);
 };
 
 } // namespace client

include/game/client/ClientGame.h

@@ -37,6 +37,7 @@ public:
     Client* getClient() const { return m_Client; }
 
     render::Renderer* getRenderer() const { return m_Renderer; }
+    WorldClient& getWorld() { return m_WorldClient; }
 
     virtual void HandlePacket(const protocol::ConnexionInfoPacket* packet);
     virtual void HandlePacket(const protocol::PlayerJoinPacket* packet);
@@ -48,7 +49,7 @@ public:
     virtual void HandlePacket(const protocol::UpdateMoneyPacket* packet);
     virtual void HandlePacket(const protocol::DisconnectPacket* packet);
     virtual void HandlePacket(const protocol::WorldDataPacket* packet);
-    virtual void HandlePacket(const protocol::WorldAddTowerPacket* packet);
+
 };
 
 } // namespace client

include/game/client/WorldClient.h

@@ -14,12 +14,13 @@ private:
 public:
     WorldClient(ClientGame* game);
 
-    virtual void HandlePacket(const protocol::WorldBeginDataPacket* packet) override;
-    virtual void HandlePacket(const protocol::WorldDataPacket* packet) override;
-    virtual void HandlePacket(const protocol::SpawnMobPacket* packet) override;
-    virtual void HandlePacket(const protocol::UpgradeTowerPacket* packet) override;
+    virtual void HandlePacket(const protocol::WorldBeginDataPacket* packet);
+    virtual void HandlePacket(const protocol::WorldDataPacket* packet);
+    virtual void HandlePacket(const protocol::SpawnMobPacket* packet);
+    virtual void HandlePacket(const protocol::UpgradeTowerPacket* packet);
+    virtual void HandlePacket(const protocol::WorldAddTowerPacket* packet);
+    virtual void HandlePacket(const protocol::RemoveTowerPacket* packet);
 
-    virtual void OnArrowShot(game::MobPtr target, game::Tower* shooter) override;
 };
 
 } // namespace client   

include/game/server/ServerConnexion.h

@@ -40,6 +40,7 @@ public:
     virtual void HandlePacket(const protocol::PlaceTowerPacket* packet);
     virtual void HandlePacket(const protocol::SendMobsPacket* packet);
     virtual void HandlePacket(const protocol::UpgradeTowerPacket* packet);
+    virtual void HandlePacket(const protocol::RemoveTowerPacket* packet);
 
     std::uint8_t getID() const { return m_ID; }
     const game::Player* getPlayer() const { return m_Player; }

include/game/server/ServerWorld.h

@@ -14,12 +14,13 @@ private:
     game::TowerID m_CurrentTowerID;
     Server* m_Server;
 public:
+    static constexpr float MobSpawnBorder = 0.01f;
+
     ServerWorld(Server* server, ServerGame* game);
 
     void spawnMobs(game::MobType type, std::uint8_t level, game::PlayerID sender, std::uint8_t count);
     game::TowerPtr placeTowerAt(game::TowerType type, std::int32_t x, std::int32_t y, game::PlayerID builder);
 
-    virtual void OnArrowShot(game::MobPtr target, game::Tower* shooter) override;
 };
 
 } // namespace server  

include/misc/Compression.h

@@ -1,7 +1,7 @@
 #pragma once
 
 #include <cstdint>
-#include "misc/DataBuffer.h"
+#include "DataBuffer.h"
 
 namespace td {
 namespace utils {

include/misc/ObjectNotifier.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include <algorithm>
+#include <functional>
+#include <vector>
+
+namespace td {
+namespace utils {
+
+template <typename Listener>
+class ObjectNotifier {
+protected:
+    std::vector<Listener*> m_Listeners;
+
+public:
+    void bindListener(Listener* listener) {
+        m_Listeners.push_back(listener);
+    }
+
+    void unbindListener(Listener* listener) {
+        auto iter = std::find(m_Listeners.begin(), m_Listeners.end(), listener);
+
+        if(iter == m_Listeners.end()) return;
+
+        m_Listeners.erase(iter);
+    }
+
+    template <typename Func, typename... Args>
+    void notifyListeners(Func function, Args... args) {
+        for (Listener* listener : m_Listeners)
+            std::bind(function, listener, args...)();
+    }
+};
+
+} // namespace utils
+} // namespace td

include/misc/Platform.h

@@ -18,7 +18,7 @@ enum class Architecture {
     Unknown,
 };
 
-inline Os getSystemOs(){
+inline Os getSystemOs() {
 #if defined(_WIN32) || defined(_WIN64)
     return Os::Windows;
 #elif defined(__ANDROID__)
@@ -26,12 +26,12 @@ inline Os getSystemOs(){
 #elif defined(__unix__)
     return Os::Linux;
 #else
-    #pragma message ("Target OS unknown or unsupported !")
+#pragma message ("Target OS unknown or unsupported !")
     return Os::Unknown;
 #endif
 }
 
-inline Architecture getSystemArchitecture(){
+inline Architecture getSystemArchitecture() {
 #if defined(_WIN64)
     return Architecture::x86_64;
 #elif defined(_WIN32)
@@ -45,7 +45,7 @@ inline Architecture getSystemArchitecture(){
 #elif defined(__arm__) || defined(_M_ARM)
     return Architecture::Armhf;
 #else
-    #pragma message ("Target CPU architecture unknown or unsupported !")
+#pragma message ("Target CPU architecture unknown or unsupported !")
     return Architecture::Unknown;
 #endif
 }

include/misc/Random.h

@@ -6,7 +6,7 @@ namespace td {
 namespace utils {
 
 template<typename NumberType>
-NumberType getRandomInt(NumberType min, NumberType max){
+NumberType getRandomInt(NumberType min, NumberType max) {
     std::random_device randomDevice;
     std::mt19937 generator(randomDevice());
     std::uniform_int_distribution<NumberType> distrib(min, max);
@@ -14,7 +14,7 @@ NumberType getRandomInt(NumberType min, NumberType max){
 }
 
 template<typename NumberType>
-NumberType getRandomReal(NumberType min, NumberType max){
+NumberType getRandomReal(NumberType min, NumberType max) {
     std::random_device randomDevice;
     std::mt19937 generator(randomDevice());
     std::uniform_real_distribution<NumberType> distrib(min, max);

include/misc/Shapes.h

@@ -0,0 +1,96 @@
+#pragma once
+
+#include <cstdint>
+
+namespace td {
+namespace utils {
+namespace shape {
+
+class Point {
+private:
+    float m_X, m_Y;
+public:
+    Point() : m_X(0), m_Y(0) {}
+    Point(float x, float y) : m_X(x), m_Y(y) {}
+
+    float getX() const { return m_X; }
+    float getY() const { return m_Y; }
+
+    void setX(float x) { m_X = x; }
+    void setY(float y) { m_Y = y; }
+
+    float distance(const Point& point) const;
+    float distanceSquared(const Point& point) const;
+};
+
+class Circle;
+
+class Rectangle {
+private:
+    Point m_Center;
+    float m_Width, m_Height;
+public:
+    Rectangle() {}
+
+    const Point& getCenter() const { return m_Center; }
+    float getCenterX() const { return m_Center.getX(); }
+    float getCenterY() const { return m_Center.getY(); }
+
+    float getWidth() const { return m_Width; }
+    float getHeight() const { return m_Height; }
+
+    Point getTopLeft() const { return { m_Center.getX() - (m_Width / 2.0f), m_Center.getY() - (m_Height / 2.0f) }; }
+    Point getBottomRight() const { return { m_Center.getX() + (m_Width / 2.0f), m_Center.getY() + (m_Height / 2.0f) }; }
+
+    void setCenter(const Point& center) { m_Center = center; }
+    void setCenterX(float x) { m_Center.setX(x); }
+    void setCenterY(float y) { m_Center.setY(y); }
+
+    void setSize(float width, float height) { setWidth(width); setHeight(height); }
+    void setSize(Point size) { setSize(size.getX(), size.getY()); }
+    Point getSize() { return { m_Width, m_Height }; }
+
+    void setWidth(float width) { m_Width = width; }
+    void setHeight(float height) { m_Height = height; }
+
+    bool collidesWith(const Point& point) const;
+    bool collidesWith(const Rectangle& rect) const;
+    bool collidesWith(const Circle& circle) const;
+
+    // distance from the closest side of the rectangle
+    float distance(const Circle& circle) const;
+    float distanceSquared(const Circle& circle) const;
+};
+
+class Circle {
+private:
+    Point m_Center;
+    float m_Radius;
+public:
+    Circle(float x, float y, float radius) : m_Center(x, y), m_Radius(radius) {}
+    Circle() : m_Radius(0) {}
+
+    const Point& getCenter() const { return m_Center; }
+    float getCenterX() const { return m_Center.getX(); }
+    float getCenterY() const { return m_Center.getY(); }
+
+    float getRadius() const { return m_Radius; }
+
+    void setCenter(const Point& center) { m_Center = center; }
+    void setCenterX(float x) { m_Center.setX(x); }
+    void setCenterY(float y) { m_Center.setY(y); }
+
+    void setRadius(float radius) { m_Radius = radius; }
+
+    bool collidesWith(const Point& point) const;
+    bool collidesWith(const Rectangle& rect) const;
+    bool collidesWith(const Circle& circle) const;
+
+    // distance from the closest side of the rectangle
+    float distance(const Rectangle& rect) const;
+    float distanceSquared(const Rectangle& rect) const;
+};
+
+} // namespace shape
+} // namespace utils 
+} // namespace td

include/misc/Time.h

@@ -39,7 +39,7 @@ public:
 // utililty class to call function at regular period of time
 class Timer {
 private:
-    std::uint64_t m_Interval;
+    std::uint64_t m_Interval; // in millis
     std::uint64_t m_InternalTime = 0;
 public:
     Timer() : m_Interval(0) {}
@@ -53,10 +53,10 @@ public:
     std::uint64_t getInterval() const { return m_Interval; }
 };
 
-// utililty class to call function at regular period of time with a cooldown (used for towers)
+// utililty class to call function at regular period of time with a cooldown (used for towers and mobs )
 class CooldownTimer {
 private:
-    std::uint64_t m_Cooldown;
+    std::uint64_t m_Cooldown; // in millis
     std::uint64_t m_CooldownTime;
 public:
     CooldownTimer() : m_Cooldown(0), m_CooldownTime(0) {}

include/protocol/PacketHandler.h

@@ -35,7 +35,7 @@ public:
     virtual void HandlePacket(const SpawnMobPacket* packet) {}
     virtual void HandlePacket(const PlaceTowerPacket* packet) {}
     virtual void HandlePacket(const WorldAddTowerPacket* packet) {}
-    virtual void HandlePacket(const WorldRemoveTowerPacket* packet) {}
+    virtual void HandlePacket(const RemoveTowerPacket* packet) {}
     virtual void HandlePacket(const SendMobsPacket* packet) {}
     virtual void HandlePacket(const UpgradeTowerPacket* packet) {}
 };

include/protocol/Protocol.h

@@ -33,12 +33,12 @@ enum class PacketType : std::uint8_t {
     UpdatePlayerTeam,
     ServerTps,
     WorldAddTower,
-    WorldRemoveTower,
 
     // client <--> server
     KeepAlive,
     Disconnect,
     UpgradeTower,
+    RemoveTower,
 };
 
 struct WorldHeader {
@@ -477,13 +477,13 @@ public:
     virtual PacketType getType() const { return PacketType::WorldAddTower; }
 };
 
-class WorldRemoveTowerPacket : public Packet {
+class RemoveTowerPacket : public Packet {
 private:
     game::TowerID m_TowerID;
 public:
-    WorldRemoveTowerPacket() {}
-    WorldRemoveTowerPacket(game::TowerID id) : m_TowerID(id) {}
-    virtual ~WorldRemoveTowerPacket() {}
+    RemoveTowerPacket() {}
+    RemoveTowerPacket(game::TowerID id) : m_TowerID(id) {}
+    virtual ~RemoveTowerPacket() {}
 
     virtual DataBuffer Serialize() const;
     virtual void Deserialize(DataBuffer& data);
@@ -491,7 +491,7 @@ public:
 
     game::TowerID getTowerID() const { return m_TowerID; }
 
-    virtual PacketType getType() const { return PacketType::WorldRemoveTower; }
+    virtual PacketType getType() const { return PacketType::RemoveTower; }
 };
 
 class UpgradeTowerPacket : public Packet {

include/render/VertexCache.h

@@ -12,15 +12,19 @@ namespace render {
 class VertexCache {
 
     typedef std::vector<float> Vector;
-    typedef std::pair<Vector::iterator, Vector::iterator> ElementsIndex;
-    typedef std::pair<ElementsIndex, ElementsIndex> DataIndex;
+
+    struct DataIndex {
+        Vector position;
+        Vector color;
+    };
 
 private:
-    Vector m_Positions;
-    Vector m_Colors;
+    std::size_t m_VertexCount;
     std::unordered_map<std::uint64_t, DataIndex> m_Indexes;
     std::unique_ptr<GL::VertexArray> m_VertexArray;
 public:
+    VertexCache() : m_VertexCount(0) {}
+
     void addData(std::uint64_t index, std::vector<float> positions, std::vector<float> colors);
     void removeData(std::uint64_t index);
     void clear();

include/render/WorldRenderer.h

@@ -7,6 +7,7 @@
 
 #include "render/gui/TowerPlacePopup.h"
 #include "render/gui/MobTooltip.h"
+#include "render/gui/CastleTooltip.h"
 
 #include "render/gui/imgui/imgui.h"
 
@@ -23,7 +24,7 @@ class ClientGame;
 
 namespace render {
 
-class WorldRenderer {
+class WorldRenderer : public game::WorldListener {
 private:
     client::ClientGame* m_Client;
     Renderer* m_Renderer;
@@ -40,15 +41,13 @@ private:
 
     std::unique_ptr<gui::TowerPlacePopup> m_TowerPlacePopup;
     std::unique_ptr<gui::MobTooltip> m_MobTooltip;
+    std::unique_ptr<gui::CastleTooltip> m_CastleTooltip;
 public:
     WorldRenderer(game::World* world, client::ClientGame* client);
     ~WorldRenderer();
 
     void loadModels();
 
-    void addTower(game::TowerPtr tower);
-    void removeTower(game::TowerPtr tower);
-
     static ImVec4 getImGuiTeamColor(game::TeamColor color);
 
     void update();
@@ -58,6 +57,11 @@ public:
 
     void moveCam(float relativeX, float relativeY, float aspectRatio);
     void changeZoom(float zoom);
+
+    // WorldListener
+
+    virtual void OnTowerAdd(game::TowerPtr tower);
+    virtual void OnTowerRemove(game::TowerPtr tower);
 private:
     void click();
     void renderWorld() const;
@@ -67,8 +71,12 @@ private:
     void renderPopups();
     void renderTowerUpgradePopup();
     void renderMobTooltip() const;
+    void renderCastleTooltip() const;
     void detectClick();
     void detectMobHovering() const;
+    void detectCastleHovering() const;
+    void renderTooltips() const;
+    void removeTower();
     glm::vec2 getCursorWorldPos() const;
     glm::vec2 getClickWorldPos() const;
 

include/render/gui/CastleTooltip.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include "GuiWidget.h"
+
+namespace td {
+
+namespace game {
+
+class TeamCastle;
+
+} // namespace game
+
+namespace gui {
+
+class CastleTooltip : public GuiWidget {
+private:
+    const game::TeamCastle* m_Castle;
+public:
+    CastleTooltip(client::Client* client);
+
+    virtual void render();
+
+    void setCastle(const game::TeamCastle* castle) { m_Castle = castle; }
+};
+
+} // namespace gui
+} // namespace td

include/render/gui/GuiManager.h

@@ -12,13 +12,13 @@ class GuiManager {
 private:
     std::vector<std::shared_ptr<GuiWidget>> m_Widgets;
 public:
-    void renderWidgets(){
-        for(auto widget : m_Widgets){
+    void renderWidgets() {
+        for (auto widget : m_Widgets) {
             widget->render();
         }
     }
 
-    void addWidgets(const std::shared_ptr<GuiWidget>& widget){
+    void addWidgets(const std::shared_ptr<GuiWidget>& widget) {
         m_Widgets.push_back(std::move(widget));
     }
 };

include/render/gui/SummonMenu.h

@@ -8,7 +8,7 @@
 namespace td {
 namespace gui {
 
-class SummonMenu : public GuiWidget{
+class SummonMenu : public GuiWidget {
 private:
     bool m_MenuOpened;
     int m_ImageWidth = 100;

include/render/gui/TowerGui.h

@@ -10,7 +10,7 @@
 #include <memory>
 
 struct SDL_Window;
-typedef void *SDL_GLContext;
+typedef void* SDL_GLContext;
 
 namespace td {
 

include/render/gui/TowerPlacePopup.h

@@ -17,11 +17,11 @@ public:
 
     void setClickPos(const glm::vec2& worldPos);
 private:
-    static constexpr float m_TowerPopupTileWidth = 250.0f;
-    static constexpr float m_TowerPopupTileHeight = 250.0f;
+    static constexpr float m_TowerPopupTileWidth = 200.0f;
+    static constexpr float m_TowerPopupTileHeight = 200.0f;
 
-    static constexpr float m_PlaceTowerButtonWidth = 200.0f;
-    static constexpr float m_PlaceTowerButtonHeight = 45.0f;
+    static constexpr float m_PlaceTowerButtonWidth = 150.0f;
+    static constexpr float m_PlaceTowerButtonHeight = 35.0f;
 };
 
 } // namespace gui

include/render/gui/UpdateMenu.h

@@ -2,7 +2,7 @@
 
 #include "GuiWidget.h"
 
-#include "misc/Updater.h"
+#include "updater/Updater.h"
 
 #include <future>
 

include/updater/Updater.h

@@ -2,9 +2,7 @@
 
 #include "misc/DataBuffer.h"
 
-#include <ctime>
-
-#define TD_VERSION "alpha-0.0.1"
+#define TD_VERSION "alpha-0.1.0"
 
 namespace td {
 namespace utils {
@@ -34,7 +32,7 @@ public:
     static std::string getLocalFilePath();
     static void removeOldFile();
 
-    static std::string getCurrentVersion(){ return TD_VERSION; }
+    static std::string getCurrentVersion() { return TD_VERSION; }
     std::string getLastVersion() { return m_LastVersion; }
 
     bool canUpdate();

src/TowerDefense.cpp

@@ -6,14 +6,26 @@
 // Description : Hello World in C++, Ansi-style
 //============================================================================
 
+#if !defined(NDEBUG) && !defined(_WIN32)
+#define BACKWARD_HAS_UNWIND 1
+#define BACKWARD_HAS_DW 1
+#endif
+
 #include "window/Display.h"
-#include "misc/Updater.h"
+#include "updater/Updater.h"
+#include "misc/Backward.hpp"
 
 #ifdef __ANDROID__
 extern "C"
 #endif
 
 int main(int argc, const char* args[]) {
+    #if !defined(NDEBUG)
+    // setup signal handling
+    backward::SignalHandling sh;
+    #endif
+
+    // remove the outdated binary
     td::utils::Updater::removeOldFile();
 
     Display::create();

src/game/BaseGame.cpp

@@ -17,5 +17,21 @@ void Game::tick(std::uint64_t delta) {
     }
 }
 
+Player* Game::getPlayerById(PlayerID id) {
+    auto it = m_Players.find(id);
+
+    if (it == m_Players.end()) return nullptr;
+
+    return &it->second;
+}
+
+const Player* Game::getPlayerById(PlayerID id) const {
+    auto it = m_Players.find(id);
+
+    if (it == m_Players.end()) return nullptr;
+
+    return &it->second;
+}
+
 } // namespace game 
 } // namespace td

src/game/Mobs.cpp

@@ -1,4 +1,6 @@
 #include "game/Mobs.h"
+#include "game/Player.h"
+#include "game/World.h"
 
 #include <map>
 #include <algorithm>
@@ -14,11 +16,11 @@ bool Mob::isImmuneTo(EffectType type) {
     return std::find(getEffectImmunities().begin(), getEffectImmunities().end(), type) != getEffectImmunities().end();
 }
 
-EffectDuration& Mob::getEffect(EffectType effectType){
+EffectDuration& Mob::getEffect(EffectType effectType) {
     return *std::find_if(m_Effects.begin(), m_Effects.end(), [&effectType](EffectDuration effect) { return effect.type == effectType;});
 }
 
-void Mob::addEffect(EffectType effectType, float durationSec, const Tower* tower) {
+void Mob::addEffect(EffectType effectType, float durationSec, Tower* tower) {
     if (isImmuneTo(effectType))
         return;
     if (hasEffect(effectType)) {
@@ -30,29 +32,194 @@ void Mob::addEffect(EffectType effectType, float durationSec, const Tower* tower
     }
 }
 
-void Mob::tick(std::uint64_t delta) {
-    updateEffects(delta);
+void Mob::attackCastle(std::uint64_t delta, World* world) {
+    if(!hasReachedEnemyCastle()) return;
+    
+    if (m_AttackTimer.update(delta)) {
+        world->getMobNotifier().notifyListeners(&MobListener::OnMobCastleDamage, this, m_CastleTarget, getStats()->getDamage());
+        m_AttackTimer.applyCooldown();
+    }
 }
 
-void Mob::updateEffects(std::uint64_t delta) {
+void Mob::walk(std::uint64_t delta, World* world) {
+    float mobWalkSpeed = getStats()->getMovementSpeed();
+
+    float walkAmount = mobWalkSpeed * ((float)delta / 1000.0f);
+
+    if (hasEffect(EffectType::Slowness))
+        walkAmount *= 0.70; // walk 30% slower
+
+    switch (getDirection()) {
+    case Direction::NegativeX: {
+        setCenterX(getCenterX() - walkAmount);
+        break;
+    }
+    case Direction::PositiveX: {
+        setCenterX(getCenterX() + walkAmount);
+        break;
+    }
+    case Direction::NegativeY: {
+        setCenterY(getCenterY() - walkAmount);
+        break;
+    }
+    case Direction::PositiveY: {
+        setCenterY(getCenterY() + walkAmount);
+        break;
+    }
+    }
+}
+
+void Mob::move(std::uint64_t delta, World* world) {
+    TilePtr tile = world->getTile(getCenter().getX(), getCenter().getY());
+
+    if (tile != nullptr && tile->getType() == TileType::Walk) {
+        WalkableTilePtr walkTile = std::static_pointer_cast<WalkableTile>(tile);
+        changeDirection(*walkTile, world);
+    }
+
+    if (hasReachedEnemyCastle()) return;
+
+    walk(delta, world);
+
+    TeamColor mobTeam = world->getPlayerById(getSender())->getTeamColor();
+
+    TeamCastle* enemyCastle = nullptr;
+
+    if (mobTeam == TeamColor::Red) {
+        enemyCastle = &world->getBlueTeam().getCastle();
+    } else if (mobTeam == TeamColor::Blue) {
+        enemyCastle = &world->getRedTeam().getCastle();
+    }
+
+    if (isTouchingCastle(*enemyCastle)) {
+        moveBack(*enemyCastle, world);
+        setMobReachedCastle(enemyCastle);
+
+        world->getMobNotifier().notifyListeners(&MobListener::OnMobTouchCastle, this, enemyCastle);
+    }
+}
+
+void Mob::moveBack(const TeamCastle& enemyCastle, World* world) {
+    switch (getDirection()) {
+    case Direction::NegativeX: {
+        setCenterX(enemyCastle.getBottomRight().getX() + getWidth() / 2.0f);
+        break;
+    }
+    case Direction::PositiveX: {
+        setCenterX(enemyCastle.getTopLeft().getX() - getWidth() / 2.0f);
+        break;
+    }
+    case Direction::NegativeY: {
+        setCenterY(enemyCastle.getBottomRight().getY() + getHeight() / 2.0f);
+        break;
+    }
+    case Direction::PositiveY: {
+        setCenterY(enemyCastle.getTopLeft().getY() - getHeight() / 2.0f);
+        break;
+    }
+    }
+}
+
+void Mob::changeDirection(const WalkableTile& tile, World* world) {
+    if (getDirection() == tile.direction) return;
+
+    float tileX = static_cast<float>(static_cast<std::int32_t>(getCenterX()));
+    float tileY = static_cast<float>(static_cast<std::int32_t>(getCenterY()));
+
+    switch (getDirection()) {
+
+    case Direction::PositiveY: {
+        if (tile.direction == Direction::NegativeX) {
+            if (getTileY() > getTileX()) {
+                setCenterY(tileY + getTileX());
+                setDirection(tile.direction);
+            }
+        } else { // tile->direction = Direction::PositiveX
+            if (getTileY() > 1 - getTileX()) {
+                setCenterY(tileY + (1 - getTileX()));
+                setDirection(tile.direction);
+            }
+        }
+        return;
+    }
+
+    case Direction::NegativeY: {
+        if (tile.direction == Direction::PositiveX) {
+            if (getTileY() < getTileX()) {
+                setCenterY(tileY + getTileX());
+                setDirection(tile.direction);
+            }
+        } else { // tile.direction = Direction::NegativeX
+            if (getTileY() < 1 - getTileX()) {
+                setCenterY(tileY + (1 - getTileX()));
+                setDirection(tile.direction);
+            }
+        }
+        return;
+    }
+
+    case Direction::PositiveX: {
+        if (tile.direction == Direction::NegativeY) {
+            if (getTileX() > getTileY()) {
+                setCenterX(tileX + getTileY());
+                setDirection(tile.direction);
+            }
+        } else { // tile.direction = Direction::PositiveY
+            if (getTileX() > 1 - getTileY()) {
+                setCenterX(tileX + (1 - getTileY()));
+                setDirection(tile.direction);
+            }
+        }
+        return;
+    }
+
+    case Direction::NegativeX: {
+        if (tile.direction == Direction::PositiveY) {
+            if (getTileX() < getTileY()) {
+                setCenterX(tileX + getTileY());
+                setDirection(tile.direction);
+            }
+        } else { // tile.direction = Direction::NegativeY
+            if (getTileX() < 1 - getTileY()) {
+                setCenterX(tileX + (1 - getTileY()));
+                setDirection(tile.direction);
+            }
+        }
+        return;
+    }
+
+    }
+}
+
+bool Mob::isTouchingCastle(const TeamCastle& enemyCastle) const {
+    return enemyCastle.collidesWith(*this);
+}
+
+void Mob::tick(std::uint64_t delta, World* world) {
+    updateEffects(delta, world);
+    move(delta, world);
+    attackCastle(delta, world);
+}
+
+void Mob::updateEffects(std::uint64_t delta, World* world) {
     float deltaSec = (float)delta / 1000.0f;
     for (std::size_t i = 0; i < m_Effects.size(); i++) {
         EffectDuration& effect = m_Effects[i];
         effect.duration -= deltaSec;
-        if (effect.duration < 0){  // effect has gone
+        if (effect.duration < 0) {  // effect has gone
             m_Effects.erase(m_Effects.begin() + i);
-            switch(effect.type){
-                case EffectType::Fire:{
+            switch (effect.type) {
+            case EffectType::Fire: {
                 m_EffectFireTimer.reset();
                 break;
             }
 
-                case EffectType::Poison:{
+            case EffectType::Poison: {
                 m_EffectPoisonTimer.reset();
                 break;
             }
 
-                case EffectType::Heal:{
+            case EffectType::Heal: {
                 m_EffectHealTimer.reset();
             }
 
@@ -61,18 +228,18 @@ void Mob::updateEffects(std::uint64_t delta) {
             }
         }
     }
-    if(hasEffect(EffectType::Fire)){
-        if(m_EffectFireTimer.update(delta)){
-            damage(3, getEffect(EffectType::Fire).tower);
+    if (hasEffect(EffectType::Fire)) {
+        if (m_EffectFireTimer.update(delta)) {
+            world->getMobNotifier().notifyListeners(&MobListener::OnMobDamage, this, 3.0f, getEffect(EffectType::Fire).tower);
         }
     }
-    if(hasEffect(EffectType::Poison)){
-        if(m_EffectPoisonTimer.update(delta)){
-            damage(1, getEffect(EffectType::Poison).tower);
+    if (hasEffect(EffectType::Poison)) {
+        if (m_EffectPoisonTimer.update(delta)) {
+            world->getMobNotifier().notifyListeners(&MobListener::OnMobDamage, this, 1.0f, getEffect(EffectType::Poison).tower);
         }
     }
-    if(hasEffect(EffectType::Heal)){
-        if(m_EffectFireTimer.update(delta)){
+    if (hasEffect(EffectType::Heal)) {
+        if (m_EffectFireTimer.update(delta)) {
             heal(10);
         }
     }
@@ -88,66 +255,66 @@ bool Mob::hasEffect(EffectType type) {
 typedef std::pair<MobType, std::uint8_t> MobKey;
 
 const std::map<MobKey, MobStats> MobConstants = {
-    // damage  speed  money_cost  exp_cost  exp_reward  max_health
-    {{MobType::Zombie, 1},{MobStats{1, 1.6, 15, 0, 7, 40}}},
-    {{MobType::Zombie, 2},{MobStats{1, 1.6, 18, 88, 9, 56}}},
-    {{MobType::Zombie, 3},{MobStats{1, 1.6, 22, 153, 10, 78}}},
-    {{MobType::Zombie, 4},{MobStats{1.5, 1.6, 26, 268, 13, 110}}},
-    {{MobType::Zombie, 5},{MobStats{2, 1.6, 31, 469, 15, 154}}},
+    // damage  speed  size  money_cost  exp_cost  exp_reward  max_health
+    {{MobType::Zombie, 1},{MobStats{1, 1.6, {1, 1}, 15, 0, 7, 40}}},
+    {{MobType::Zombie, 2},{MobStats{1, 1.6, {1, 1}, 18, 88, 9, 56}}},
+    {{MobType::Zombie, 3},{MobStats{1, 1.6, {1, 1}, 22, 153, 10, 78}}},
+    {{MobType::Zombie, 4},{MobStats{1.5, 1.6, {1, 1}, 26, 268, 13, 110}}},
+    {{MobType::Zombie, 5},{MobStats{2, 1.6, {1, 1}, 31, 469, 15, 154}}},
 
-    {{MobType::Spider, 1},{MobStats{1, 1.6, 25, 100, 15, 80}}},
-    {{MobType::Spider, 2},{MobStats{1, 2, 30, 175, 16, 112}}},
-    {{MobType::Spider, 3},{MobStats{1.5, 2, 36, 306, 18, 157}}},
-    {{MobType::Spider, 4},{MobStats{2.5, 2, 43, 536, 19, 222}}},
-    {{MobType::Spider, 5},{MobStats{1.5, 2.5, 52, 938, 22, 307}}},
+    {{MobType::Spider, 1},{MobStats{1, 1.6, {1, 1}, 25, 100, 15, 80}}},
+    {{MobType::Spider, 2},{MobStats{1, 2, {1, 1}, 30, 175, 16, 112}}},
+    {{MobType::Spider, 3},{MobStats{1.5, 2, {1, 1}, 36, 306, 18, 157}}},
+    {{MobType::Spider, 4},{MobStats{2.5, 2, {1, 1}, 43, 536, 19, 222}}},
+    {{MobType::Spider, 5},{MobStats{1.5, 2.5, {1, 1}, 52, 938, 22, 307}}},
 
-    {{MobType::Skeleton, 1},{MobStats{1, 1.6, 120, 200, 30, 350}}},
-    {{MobType::Skeleton, 2},{MobStats{1, 1.6, 144, 350, 33, 490}}},
-    {{MobType::Skeleton, 3},{MobStats{1, 1.6, 173, 613, 36, 686}}},
-    {{MobType::Skeleton, 4},{MobStats{1.5, 1.6, 225, 1072, 40, 960}}},
-    {{MobType::Skeleton, 5},{MobStats{2, 1.6, 255, 1876, 43, 1345}}},
+    {{MobType::Skeleton, 1},{MobStats{1, 1.6, {1, 1}, 120, 200, 30, 350}}},
+    {{MobType::Skeleton, 2},{MobStats{1, 1.6, {1, 1}, 144, 350, 33, 490}}},
+    {{MobType::Skeleton, 3},{MobStats{1, 1.6, {1, 1}, 173, 613, 36, 686}}},
+    {{MobType::Skeleton, 4},{MobStats{1.5, 1.6, {1, 1}, 225, 1072, 40, 960}}},
+    {{MobType::Skeleton, 5},{MobStats{2, 1.6, {1, 1}, 255, 1876, 43, 1345}}},
 
-    {{MobType::Pigman, 1},{MobStats{1, 2, 100, 150, 22, 150}}},
-    {{MobType::Pigman, 2},{MobStats{1, 2, 120, 263, 24, 210}}},
-    {{MobType::Pigman, 3},{MobStats{1, 2, 144, 459, 25, 297}}},
-    {{MobType::Pigman, 4},{MobStats{1, 2, 173, 804, 25, 412}}},
-    {{MobType::Pigman, 5},{MobStats{1.5, 2, 207, 1407, 27, 576}}},
+    {{MobType::Pigman, 1},{MobStats{1, 2, {1, 1}, 100, 150, 22, 150}}},
+    {{MobType::Pigman, 2},{MobStats{1, 2, {1, 1}, 120, 263, 24, 210}}},
+    {{MobType::Pigman, 3},{MobStats{1, 2, {1, 1}, 144, 459, 25, 297}}},
+    {{MobType::Pigman, 4},{MobStats{1, 2, {1, 1}, 173, 804, 25, 412}}},
+    {{MobType::Pigman, 5},{MobStats{1.5, 2, {1, 1}, 207, 1407, 27, 576}}},
 
-    {{MobType::Creeper, 1},{MobStats{1, 2, 250, 325, 46, 350}}},
-    {{MobType::Creeper, 2},{MobStats{1, 2, 290, 550, 49, 460}}},
-    {{MobType::Creeper, 3},{MobStats{2, 2, 350, 800, 55, 630}}},
-    {{MobType::Creeper, 4},{MobStats{3, 2, 420, 1300, 61, 900}}},
-    {{MobType::Creeper, 5},{MobStats{4, 2, 510, 1850, 67, 1250}}},
+    {{MobType::Creeper, 1},{MobStats{1, 2, {1, 1}, 250, 325, 46, 350}}},
+    {{MobType::Creeper, 2},{MobStats{1, 2, {1, 1}, 290, 550, 49, 460}}},
+    {{MobType::Creeper, 3},{MobStats{2, 2, {1, 1}, 350, 800, 55, 630}}},
+    {{MobType::Creeper, 4},{MobStats{3, 2, {1, 1}, 420, 1300, 61, 900}}},
+    {{MobType::Creeper, 5},{MobStats{4, 2, {1, 1}, 510, 1850, 67, 1250}}},
 
-    {{MobType::Silverfish, 1},{MobStats{1, 1.6, 38, 125, 18, 120}}},
-    {{MobType::Silverfish, 2},{MobStats{1, 1.6, 50, 230, 19, 170}}},
-    {{MobType::Silverfish, 3},{MobStats{1, 1.6, 75, 340, 25, 225}}},
-    {{MobType::Silverfish, 4},{MobStats{1.5, 1.6, 170, 700, 33, 310}}},
-    {{MobType::Silverfish, 5},{MobStats{1.5, 1.6, 200, 1800, 36, 390}}},
+    {{MobType::Silverfish, 1},{MobStats{1, 1.6, {1, 1}, 38, 125, 18, 120}}},
+    {{MobType::Silverfish, 2},{MobStats{1, 1.6, {1, 1}, 50, 230, 19, 170}}},
+    {{MobType::Silverfish, 3},{MobStats{1, 1.6, {1, 1}, 75, 340, 25, 225}}},
+    {{MobType::Silverfish, 4},{MobStats{1.5, 1.6, {1, 1}, 170, 700, 33, 310}}},
+    {{MobType::Silverfish, 5},{MobStats{1.5, 1.6, {1, 1}, 200, 1800, 36, 390}}},
 
-    {{MobType::Blaze, 1},{MobStats{1, 1.6, 500, 500, 105, 410}}},
-    {{MobType::Blaze, 2},{MobStats{1, 1.6, 600, 875, 111, 574}}},
-    {{MobType::Blaze, 3},{MobStats{1, 1.6, 720, 1531, 115, 804}}},
-    {{MobType::Blaze, 4},{MobStats{1.5, 1.6, 864, 2680, 121, 1125}}},
-    {{MobType::Blaze, 5},{MobStats{2, 1.6, 1037, 4689, 127, 1575}}},
+    {{MobType::Blaze, 1},{MobStats{1, 1.6, {1, 1}, 500, 500, 105, 410}}},
+    {{MobType::Blaze, 2},{MobStats{1, 1.6, {1, 1}, 600, 875, 111, 574}}},
+    {{MobType::Blaze, 3},{MobStats{1, 1.6, {1, 1}, 720, 1531, 115, 804}}},
+    {{MobType::Blaze, 4},{MobStats{1.5, 1.6, {1, 1}, 864, 2680, 121, 1125}}},
+    {{MobType::Blaze, 5},{MobStats{2, 1.6, {1, 1}, 1037, 4689, 127, 1575}}},
 
-    {{MobType::Witch, 1},{MobStats{1, 1.6, 150, 300, 37, 300}}},
-    {{MobType::Witch, 2},{MobStats{1, 1.6, 165, 525, 39, 405}}},
-    {{MobType::Witch, 3},{MobStats{1, 1.6, 182, 918, 42, 547}}},
-    {{MobType::Witch, 4},{MobStats{1.5, 1.6, 200, 1606, 43, 738}}},
-    {{MobType::Witch, 5},{MobStats{2, 1.6, 220, 2810, 45, 996}}},
+    {{MobType::Witch, 1},{MobStats{1, 1.6, {1, 1}, 150, 300, 37, 300}}},
+    {{MobType::Witch, 2},{MobStats{1, 1.6, {1, 1}, 165, 525, 39, 405}}},
+    {{MobType::Witch, 3},{MobStats{1, 1.6, {1, 1}, 182, 918, 42, 547}}},
+    {{MobType::Witch, 4},{MobStats{1.5, 1.6, {1, 1}, 200, 1606, 43, 738}}},
+    {{MobType::Witch, 5},{MobStats{2, 1.6, {1, 1}, 220, 2810, 45, 996}}},
 
-    {{MobType::Slime, 1},{MobStats{1, 0.8, 1500, 1000, 300, 800}}},
-    {{MobType::Slime, 2},{MobStats{1.5, 0.8, 1800, 1750, 314, 880}}},
-    {{MobType::Slime, 3},{MobStats{2, 0.8, 2160, 3063, 330, 968}}},
-    {{MobType::Slime, 4},{MobStats{2.5, 0.8, 2592, 5359, 348, 1065}}},
-    {{MobType::Slime, 5},{MobStats{3, 0.8, 3110, 9379, 366, 1171}}},
+    {{MobType::Slime, 1},{MobStats{1, 0.8, {1, 1}, 1500, 1000, 300, 800}}},
+    {{MobType::Slime, 2},{MobStats{1.5, 0.8, {1, 1}, 1800, 1750, 314, 880}}},
+    {{MobType::Slime, 3},{MobStats{2, 0.8, {1, 1}, 2160, 3063, 330, 968}}},
+    {{MobType::Slime, 4},{MobStats{2.5, 0.8, {1, 1}, 2592, 5359, 348, 1065}}},
+    {{MobType::Slime, 5},{MobStats{3, 0.8, {1, 1}, 3110, 9379, 366, 1171}}},
 
-    {{MobType::Giant, 1},{MobStats{10, 0.8, 4000, 2250, 600, 6250}}},
-    {{MobType::Giant, 2},{MobStats{20, 0.8, 4500, 4000, 612, 9375}}},
-    {{MobType::Giant, 3},{MobStats{30, 0.8, 5062, 7250, 624, 14062}}},
-    {{MobType::Giant, 4},{MobStats{40, 0.8, 5695, 12500, 636, 21093}}},
-    {{MobType::Giant, 5},{MobStats{50, 0.8, 6407, 22000, 648, 31640}}},
+    {{MobType::Giant, 1},{MobStats{10, 0.8, {1, 1}, 4000, 2250, 600, 6250}}},
+    {{MobType::Giant, 2},{MobStats{20, 0.8, {1, 1}, 4500, 4000, 612, 9375}}},
+    {{MobType::Giant, 3},{MobStats{30, 0.8, {1, 1}, 5062, 7250, 624, 14062}}},
+    {{MobType::Giant, 4},{MobStats{40, 0.8, {1, 1}, 5695, 12500, 636, 21093}}},
+    {{MobType::Giant, 5},{MobStats{50, 0.8, {1, 1}, 6407, 22000, 648, 31640}}},
 };
 
 const MobStats* getMobStats(MobType type, std::uint8_t level) {
@@ -235,7 +402,7 @@ const std::map<MobKey, EffectImmunities> MobsEffectImmunities = {
 
     {{MobType::Skeleton, 1},{}},
     {{MobType::Skeleton, 2},{}},
-    {{MobType::Skeleton, 3},{EffectType::Fire}},
+    {{MobType::Skeleton, 3},{}},
     {{MobType::Skeleton, 4},{EffectType::Fire}},
     {{MobType::Skeleton, 5},{EffectType::Fire}},
 
@@ -305,8 +472,8 @@ MobPtr MobFactory::createMob(MobID id, MobType type, std::uint8_t level, PlayerI
     return mobFactory[type](id, level, sender);
 }
 
-std::string MobFactory::getMobName(MobType type){
-    switch(type){
+std::string MobFactory::getMobName(MobType type) {
+    switch (type) {
     case MobType::Zombie:
         return "Zombie";
     case MobType::Spider:

src/game/Team.cpp

@@ -1,9 +1,11 @@
 #include "game/Player.h"
 
+#include <algorithm>
+
 namespace td {
 namespace game {
 
-Team::Team(TeamColor color) : m_Color(color) {}
+Team::Team(TeamColor color) : m_Color(color), m_TeamCastle(this) {}
 
 void Team::addPlayer(Player* newPlayer) {
     m_Players.push_back(newPlayer);

src/game/Towers.cpp

@@ -9,7 +9,7 @@ namespace game {
 bool Tower::isMobInRange(MobPtr mob) {
     if (mob->isDead())
         return false;
-    return (m_X - mob->getX()) * (m_X - mob->getX()) + (m_Y - mob->getY()) * (m_Y - mob->getY()) < (getStats()->getRange() * getStats()->getRange());
+    return mob->collidesWith(*this);
 }
 
 const std::map<std::pair<TowerType, TowerLevel>, TowerStats> TowerConstants = {
@@ -21,8 +21,8 @@ const std::map<std::pair<TowerType, TowerLevel>, TowerStats> TowerConstants = {
     {{TowerType::Archer, {4, TowerPath::Top}}, {0.8, 0, 15}},
 
     {{TowerType::Archer, {2, TowerPath::Bottom}}, {2, 10, 12}},
-    {{TowerType::Archer, {3, TowerPath::Bottom}}, {2, 0, 13}},
-    {{TowerType::Archer, {4, TowerPath::Bottom}}, {2, 0, 15}},
+    {{TowerType::Archer, {3, TowerPath::Bottom}}, {2, 10, 13}},
+    {{TowerType::Archer, {4, TowerPath::Bottom}}, {2, 10, 15}},
 
     //-----------------------------------------------------------------
 
@@ -116,8 +116,8 @@ const std::map<std::pair<TowerType, TowerLevel>, TowerStats> TowerConstants = {
 };
 
 const TowerStats* getTowerStats(TowerType type, TowerLevel level) {
-    auto it = TowerConstants.find({type, level});
-    if(it == TowerConstants.end()) return nullptr;
+    auto it = TowerConstants.find({ type, level });
+    if (it == TowerConstants.end()) return nullptr;
     return &it->second;
 }
 
@@ -213,11 +213,11 @@ void ArcherTower::tick(std::uint64_t delta, World* world) {
         std::uint8_t arrows = explosiveArrows ? 2 : getLevel().getLevel();
         for (MobPtr mob : world->getMobList()) {
             if (isMobInRange(mob)) {
-                world->OnArrowShot(mob, this);
+                world->getWorldNotifier().notifyListeners(&WorldListener::OnArcherTowerShot, mob, this);
+                m_Timer.applyCooldown();
                 arrowsShot++;
                 if (arrowsShot >= arrows)
                     break;
-                m_Timer.applyCooldown();
             }
         }
     }
@@ -229,7 +229,8 @@ void IceTower::tick(std::uint64_t delta, World* world) {
         for (MobPtr mob : world->getMobList()) {
             if (isMobInRange(mob)) {
                 mob->addEffect(EffectType::Slowness, 1, this);    // slowness for 1s every second
-                mob->damage(damage, this);
+                if (damage > 0)
+                    world->getMobNotifier().notifyListeners(&MobListener::OnMobDamage, mob.get(), damage, this);
                 m_Timer.applyCooldown();
             }
         }
@@ -251,11 +252,11 @@ void PoisonTower::tick(std::uint64_t delta, World* world) {
     if (m_Timer.update(delta)) {
         for (MobPtr mob : world->getMobList()) {
             if (isMobInRange(mob)) {
-                if(getLevel().getPath() == TowerPath::Bottom){
-                    mob->damage(getStats()->getDamage(), this);
-                }else{
+                if (getLevel().getPath() == TowerPath::Bottom) {
+                    world->getMobNotifier().notifyListeners(&MobListener::OnMobDamage, mob.get(), getStats()->getDamage(), this);
+                } else {
                     float durationSec;
-                    switch(getLevel().getLevel()){
+                    switch (getLevel().getLevel()) {
                     case 1:
                         durationSec = 5;
                         break;

src/game/World.cpp

@@ -13,15 +13,16 @@ namespace td {
 namespace game {
 
 World::World(Game* game) : m_Game(game) {
-
+    getWorldNotifier().bindListener(this);
+    getMobNotifier().bindListener(this);
 }
 
 TilePtr World::getTile(std::int32_t x, std::int32_t y) const {
     std::int16_t chunkX = x / Chunk::ChunkWidth;
     std::int16_t chunkY = y / Chunk::ChunkHeight;
 
-    std::uint16_t subChunkX = x % Chunk::ChunkWidth;
-    std::uint16_t subChunkY = y % Chunk::ChunkHeight;
+    std::uint16_t subChunkX = std::abs(x % Chunk::ChunkWidth);
+    std::uint16_t subChunkY = std::abs(y % Chunk::ChunkHeight);
 
     auto chunkIt = m_Chunks.find({ chunkX, chunkY });
     if (chunkIt == m_Chunks.end())
@@ -43,7 +44,10 @@ bool World::loadMap(const protocol::WorldBeginDataPacket* worldHeader) {
     m_SpawnColorPalette = worldHeader->getSpawnPalette();
 
     getRedTeam().getCastle() = worldHeader->getRedCastle();
+    getRedTeam().getCastle().setTeam(&getRedTeam());
+
     getBlueTeam().getCastle() = worldHeader->getBlueCastle();
+    getBlueTeam().getCastle().setTeam(&getBlueTeam());
 
     m_TilePalette = worldHeader->getTilePalette();
 
@@ -101,7 +105,6 @@ bool World::saveMap(const std::string& fileName) const {
 }
 
 void World::tick(std::uint64_t delta) {
-    moveMobs(delta);
     tickMobs(delta);
     for (TowerPtr tower : m_Towers) {
         tower->tick(delta, this);
@@ -111,10 +114,10 @@ void World::tick(std::uint64_t delta) {
 
 void World::spawnMobAt(MobID id, MobType type, std::uint8_t level, PlayerID sender, float x, float y, Direction dir) {
     MobPtr mob = MobFactory::createMob(id, type, level, sender);
-    mob->setX(x);
-    mob->setY(y);
+    mob->setCenter({ x, y });
     mob->setDirection(dir);
     m_Mobs.push_back(mob);
+    getMobNotifier().notifyListeners(&MobListener::OnMobSpawn, mob.get());
 }
 
 TowerPtr World::placeTowerAt(TowerID id, TowerType type, std::int32_t x, std::int32_t y, PlayerID builder) {
@@ -123,46 +126,20 @@ TowerPtr World::placeTowerAt(TowerID id, TowerType type, std::int32_t x, std::in
     return tower;
 }
 
-void World::tickMobs(std::uint64_t delta) {
-    for (MobPtr mob : m_Mobs) {
-        mob->tick(delta);
-    }
+TowerPtr World::removeTower(TowerID towerId) {
+    auto it = std::find_if(m_Towers.begin(), m_Towers.end(), [towerId](TowerPtr tower) { return tower->getID() == towerId;});
+    if (it == m_Towers.end()) return nullptr;
+
+    TowerPtr tower = *it;
+
+    m_Towers.erase(it);
+
+    return tower;
 }
 
-void World::moveMobs(std::uint64_t delta) {
+void World::tickMobs(std::uint64_t delta) {
     for (MobPtr mob : m_Mobs) {
-        TilePtr tile = getTile(mob->getX(), mob->getY());
-
-        if (tile != nullptr && tile->getType() == TileType::Walk) {
-            WalkableTile* walkTile = dynamic_cast<WalkableTile*>(tile.get());
-            mob->setDirection(walkTile->direction);
-        }
-
-        float mobWalkSpeed = mob->getStats()->getMovementSpeed();
-
-        float walkAmount = mobWalkSpeed * ((float)delta / 1000.0f);
-
-        if (mob->hasEffect(EffectType::Slowness))
-            walkAmount *= 0.70;
-
-        switch (mob->getDirection()) {
-        case Direction::NegativeX: {
-            mob->setX(mob->getX() - walkAmount);
-            break;
-        }
-        case Direction::PositiveX: {
-            mob->setX(mob->getX() + walkAmount);
-            break;
-        }
-        case Direction::NegativeY: {
-            mob->setY(mob->getY() - walkAmount);
-            break;
-        }
-        case Direction::PositiveY: {
-            mob->setY(mob->getY() + walkAmount);
-            break;
-        }
-        }
+        mob->tick(delta, this);
     }
 }
 
@@ -241,19 +218,22 @@ bool World::CanPlaceBigTower(const glm::vec2& worldPos, PlayerID playerID) const
     return false;
 }
 
+void World::OnMobDie(Mob* mob) {
+    if (mob->OnDeath(this)) { // check if the mob is actually dead (slimes ...)
+        //reward players
+        Player* sender = m_Game->getPlayerById(mob->getSender());
+        sender->addExp(mob->getStats()->getExpReward());
+
+        Player* killer = m_Game->getPlayerById(mob->getLastDamageTower()->getBuilder());
+        killer->addGold(mob->getStats()->getMoneyCost());
+    }
+}
+
 void World::cleanDeadMobs() {
+    // safely remove mobs when unused
     for (std::size_t i = 0; i < m_Mobs.size(); i++) {
         MobPtr mob = m_Mobs[i];
         if (mob->isDead()) {
-            mob->OnDeath(this);
-
-            //reward players
-            Player& sender = m_Game->getPlayerById(mob->getSender());
-            sender.addExp(mob->getStats()->getExpReward());
-
-            Player& killer = m_Game->getPlayerById(mob->getLastDamageTower()->getBuilder());
-            killer.addGold(mob->getStats()->getMoneyCost());
-
             m_Mobs.erase(m_Mobs.begin() + i);
         }
     }
@@ -262,13 +242,13 @@ void World::cleanDeadMobs() {
 TowerPtr World::getTower(const glm::vec2& position) const {
     for (TowerPtr tower : m_Towers) {
         if (tower->getSize() == TowerSize::Big) {
-            if (tower->getX() - 2 <= static_cast<std::int32_t>(position.x) && tower->getX() + 2 >= static_cast<std::int32_t>(position.x) &&
-                tower->getY() - 2 <= static_cast<std::int32_t>(position.y) && tower->getY() + 2 >= static_cast<std::int32_t>(position.y)) {
+            if (tower->getCenterX() - 2.5f < position.x && tower->getCenterX() + 2.5f > position.x &&
+                tower->getCenterY() - 2.5f < position.y && tower->getCenterY() + 2.5f > position.y) {
                 return tower;
             }
-        } else {
-            if (tower->getX() - 1 <= static_cast<std::int32_t>(position.x) && tower->getX() + 1 >= static_cast<std::int32_t>(position.x) &&
-                tower->getY() - 1 <= static_cast<std::int32_t>(position.y) && tower->getY() + 1 >= static_cast<std::int32_t>(position.y)) {
+        } else { // little tower
+            if (tower->getCenterX() - 1.5f < position.x && tower->getCenterX() + 1.5f > position.x &&
+                tower->getCenterY() - 1.5f < position.y && tower->getCenterY() + 1.5f > position.y) {
                 return tower;
             }
         }
@@ -278,16 +258,48 @@ TowerPtr World::getTower(const glm::vec2& position) const {
 
 TowerPtr World::getTowerById(TowerID towerID) {
     auto it = std::find_if(m_Towers.begin(), m_Towers.end(), [towerID](TowerPtr tower) { return tower->getID() == towerID;});
-    if(it == m_Towers.end()) return nullptr;
+    if (it == m_Towers.end()) return nullptr;
     return *it;
 }
 
-void World::OnArrowShot(MobPtr target, Tower* shooter) {
-    bool explosiveArrows = shooter->getLevel().getPath() == TowerPath::Bottom;
+void World::OnArcherTowerShot(MobPtr target, ArcherTower* shooter) {
+    bool fireArrows = shooter->getLevel().getPath() == TowerPath::Bottom;
+    bool explosiveArrows = shooter->getLevel().getLevel() == 4 && fireArrows;
+
+    getWorldNotifier().notifyListeners(&WorldListener::OnArrowShot, target, fireArrows, shooter);
     if (explosiveArrows) {
-        // aoe damage
-    } else {
-        target->damage(shooter->getStats()->getDamage(), shooter);
+        getWorldNotifier().notifyListeners(&WorldListener::OnExplosion, utils::shape::Circle{ target->getCenterX(), target->getCenterY(), ArcherTower::ExplosionRadius }, shooter->getStats()->getDamage(), shooter);
+    }
+}
+
+void World::OnArrowShot(MobPtr target, bool fireArrow, Tower* shooter) {
+    getMobNotifier().notifyListeners(&MobListener::OnMobDamage, target.get(), shooter->getStats()->getDamage(), shooter);
+    if (fireArrow) {
+        target->addEffect(EffectType::Fire, ArcherTower::FireDurationSec, shooter);
+    }
+}
+
+void World::OnExplosion(utils::shape::Circle explosion, float centerDamage, Tower* shooter) {
+    for (MobPtr mob : m_Mobs) {
+        if (mob->isAlive() && mob->collidesWith(explosion)) {
+            // linear distance damage reduction
+            float explosionDamage = mob->distance(explosion) / explosion.getRadius() * centerDamage;
+            getMobNotifier().notifyListeners(&MobListener::OnMobDamage, mob.get(), explosionDamage, shooter);
+        }
+    }
+}
+
+void World::OnMobCastleDamage(Mob* damager, TeamCastle* enemyCastle, float damage) {
+    enemyCastle->damage(damage);
+    if (enemyCastle->getLife() <= 0) {
+        // TODO: a team has won
+    }
+}
+
+void World::OnMobDamage(Mob* target, float damage, Tower* source) {
+    target->damage(damage, source);
+    if (target->isDead()) {
+        getMobNotifier().notifyListeners(&MobListener::OnMobDie, target);
     }
 }
 
@@ -315,5 +327,13 @@ const Team& World::getTeam(TeamColor team) const {
     return m_Game->getTeam(team);
 }
 
+const Player* World::getPlayerById(PlayerID id) const {
+    return m_Game->getPlayerById(id);
+}
+
+const TeamList& World::getTeams() const {
+    return m_Game->getTeams();
+}
+
 } // namespace game
 } // namespace td

src/game/client/Client.cpp

@@ -49,7 +49,7 @@ void Client::render() {
     m_Game.renderWorld();
 }
 
-void Client::sendMobs(const std::vector<protocol::MobSend>& mobSends){
+void Client::sendMobs(const std::vector<protocol::MobSend>& mobSends) {
     protocol::SendMobsPacket packet(mobSends);
     m_Connexion.sendPacket(&packet);
 }
@@ -59,10 +59,15 @@ void Client::placeTower(game::TowerType type, const glm::vec2& position) {
     m_Connexion.sendPacket(&packet);
 }
 
-void Client::upgradeTower(game::TowerID tower, game::TowerLevel level){
+void Client::upgradeTower(game::TowerID tower, game::TowerLevel level) {
     protocol::UpgradeTowerPacket packet(tower, level);
     m_Connexion.sendPacket(&packet);
 }
 
+void Client::removeTower(game::TowerID tower) {
+    protocol::RemoveTowerPacket packet(tower);
+    m_Connexion.sendPacket(&packet);
+}
+
 } // namespace client
 } // namespace td

src/game/client/ClientGame.cpp

@@ -1,10 +1,7 @@
 #include "game/client/ClientGame.h"
 #include "protocol/PacketDispatcher.h"
-//#include "game/Team.h"
 #include "game/client/Client.h"
 
-#include <iostream>
-
 namespace td {
 namespace client {
 
@@ -21,7 +18,6 @@ m_WorldRenderer(&m_WorldClient, this) {
     GetDispatcher()->RegisterHandler(protocol::PacketType::UpdateMoney, this);
     GetDispatcher()->RegisterHandler(protocol::PacketType::Disconnect, this);
     GetDispatcher()->RegisterHandler(protocol::PacketType::WorldData, this);
-    GetDispatcher()->RegisterHandler(protocol::PacketType::WorldAddTower, this);
 }
 
 ClientGame::~ClientGame() {
@@ -103,7 +99,7 @@ void ClientGame::HandlePacket(const protocol::WorldDataPacket* packet) {
     m_WorldRenderer.loadModels();
     // set cam pos to player spawn
     const game::Spawn& spawn = m_World->getTeam(m_Player->getTeamColor()).getSpawn();
-    m_WorldRenderer.setCamPos(spawn.x + 0.5, spawn.y + 0.5);
+    m_WorldRenderer.setCamPos(spawn.getCenterX(), spawn.getCenterY());
 }
 
 void ClientGame::renderWorld() {
@@ -112,9 +108,5 @@ void ClientGame::renderWorld() {
     }
 }
 
-void ClientGame::HandlePacket(const protocol::WorldAddTowerPacket* packet) {
-    m_WorldRenderer.addTower(m_WorldClient.placeTowerAt(packet->getTowerID(), packet->getTowerType(), packet->getTowerX(), packet->getTowerY(), packet->getBuilder()));
-}
-
 } // namespace client
 } // namespace td

src/game/client/WorldClient.cpp

@@ -7,10 +7,12 @@ namespace td {
 namespace client {
 
 WorldClient::WorldClient(ClientGame* game) : game::World(game), protocol::PacketHandler(game->GetDispatcher()), m_Game(game) {
+    GetDispatcher()->RegisterHandler(protocol::PacketType::WorldAddTower, this);
     GetDispatcher()->RegisterHandler(protocol::PacketType::WorldBeginData, this);
     GetDispatcher()->RegisterHandler(protocol::PacketType::WorldData, this);
     GetDispatcher()->RegisterHandler(protocol::PacketType::SpawnMob, this);
     GetDispatcher()->RegisterHandler(protocol::PacketType::UpgradeTower, this);
+    GetDispatcher()->RegisterHandler(protocol::PacketType::RemoveTower, this);
 }
 
 void WorldClient::HandlePacket(const protocol::WorldBeginDataPacket* packet) {
@@ -28,12 +30,22 @@ void WorldClient::HandlePacket(const protocol::SpawnMobPacket* packet) {
 
 void WorldClient::HandlePacket(const protocol::UpgradeTowerPacket* packet) {
     game::TowerPtr tower = getTowerById(packet->getTowerID());
-    if(tower == nullptr) return; // this should not happen but who knows ?
+    if (tower == nullptr) return; // this should not happen but who knows ?
     tower->upgrade(packet->getTowerLevel().getLevel(), packet->getTowerLevel().getPath());
 }
 
-void WorldClient::OnArrowShot(game::MobPtr target, game::Tower* tower) {
-    World::OnArrowShot(target, tower);
+void WorldClient::HandlePacket(const protocol::WorldAddTowerPacket* packet) {
+    game::TowerPtr newTower = placeTowerAt(packet->getTowerID(), packet->getTowerType(), packet->getTowerX(), packet->getTowerY(), packet->getBuilder());
+
+    getWorldNotifier().notifyListeners(&WorldListener::OnTowerAdd, newTower);
+}
+
+void WorldClient::HandlePacket(const protocol::RemoveTowerPacket* packet) {
+    game::TowerPtr tower = removeTower(packet->getTowerID());
+
+    if (tower != nullptr) {
+        getWorldNotifier().notifyListeners(&WorldListener::OnTowerRemove, tower);
+    }
 }
 
 } // namespace client

src/game/server/Server.cpp

@@ -32,9 +32,9 @@ void Server::startThread() {
         });
 }
 
-void Server::stopThread(){
+void Server::stopThread() {
     m_ServerRunning = false;
-    if(m_Thread.joinable())
+    if (m_Thread.joinable())
         m_Thread.join();
 }
 
@@ -55,7 +55,7 @@ bool Server::start(std::uint16_t port) {
 }
 
 void Server::stop() {
-    if(!m_ServerRunning)
+    if (!m_ServerRunning)
         return;
     stopThread();
 

src/game/server/ServerConnexion.cpp

@@ -41,6 +41,7 @@ void ServerConnexion::registerHandlers() {
     GetDispatcher()->RegisterHandler(protocol::PacketType::PlaceTower, this);
     GetDispatcher()->RegisterHandler(protocol::PacketType::SendMobs, this);
     GetDispatcher()->RegisterHandler(protocol::PacketType::UpgradeTower, this);
+    GetDispatcher()->RegisterHandler(protocol::PacketType::RemoveTower, this);
 }
 
 bool ServerConnexion::updateSocket() {
@@ -159,6 +160,8 @@ void ServerConnexion::HandlePacket(const protocol::PlaceTowerPacket* packet) {
 
     game::TowerPtr tower = world->placeTowerAt(towerType, packet->getTowerX(), packet->getTowerY(), m_ID);
 
+    world->getWorldNotifier().notifyListeners(&game::WorldListener::OnTowerAdd, tower);
+
     protocol::WorldAddTowerPacket addTowerPacket(tower->getID(), packet->getTowerX(), packet->getTowerY(), packet->getTowerType(), m_ID);
     m_Server->broadcastPacket(&addTowerPacket);
 }
@@ -168,12 +171,18 @@ void ServerConnexion::HandlePacket(const protocol::SendMobsPacket* packet) {
 
     //TODO: verify the packet
 
-    for(protocol::MobSend mobSend : mobSent){
+    for (protocol::MobSend mobSend : mobSent) {
         m_Server->getGame().getServerWorld()->spawnMobs(mobSend.mobType, mobSend.mobLevel, m_ID, mobSend.mobCount);
     }
 }
 
-void ServerConnexion::HandlePacket(const protocol::UpgradeTowerPacket* packet){
+void ServerConnexion::HandlePacket(const protocol::UpgradeTowerPacket* packet) {
+    //TODO: verify the packet
+
+    m_Server->broadcastPacket(packet);
+}
+
+void ServerConnexion::HandlePacket(const protocol::RemoveTowerPacket* packet) {
     //TODO: verify the packet
 
     m_Server->broadcastPacket(packet);

src/game/server/ServerGame.cpp

@@ -9,7 +9,7 @@ ServerGame::ServerGame(server::Server* server) : game::Game(&m_ServerWorld), m_S
 }
 
 void ServerGame::tick(std::uint64_t delta) {
-    if(m_GameState == game::GameState::Game){
+    if (m_GameState == game::GameState::Game) {
         Game::tick(delta);
         updatePlayerStats();
     }
@@ -27,16 +27,16 @@ void ServerGame::startGame() {
     m_GameState = game::GameState::Game;
 }
 
-void ServerGame::updatePlayerStats(){
+void ServerGame::updatePlayerStats() {
     m_GoldMineTimer.update();
     for (auto& pair : m_Server->getPlayers()) {
         game::Player& player = pair.second;
-        if(player.hasGoldChanged()){
+        if (player.hasGoldChanged()) {
             protocol::UpdateMoneyPacket packet(player.getGold());
             m_Server->getConnexions()[player.getID()].sendPacket(&packet);
             player.updateGold();
         }
-        if(player.hasExpChanged()){
+        if (player.hasExpChanged()) {
             protocol::UpdateExpPacket packet(player.getExp());
             m_Server->getConnexions()[player.getID()].sendPacket(&packet);
             player.updateExp();

src/game/server/ServerWorld.cpp

@@ -22,21 +22,27 @@ void ServerWorld::spawnMobs(game::MobType type, std::uint8_t level, game::Player
             enemyMobSpawn = &getTeam(game::TeamColor::Red).getSpawn();
         }
 
-        std::int32_t spawnCenterX = enemyMobSpawn->x;
-        std::int32_t spawnCenterY = enemyMobSpawn->y;
+        float spawnWidth = enemyMobSpawn->getWidth();
+        float spawnHeight = enemyMobSpawn->getHeight();
 
-        std::int32_t minSpawnY = spawnCenterY - 2;
-        std::int32_t maxSpawnY = spawnCenterY + 2;
+        float spawnCenterX = enemyMobSpawn->getCenterX();
+        float spawnCenterY = enemyMobSpawn->getCenterY();
 
-        std::int32_t minSpawnX = spawnCenterX - 2;
-        std::int32_t maxSpawnX = spawnCenterX + 2;
+        auto mobStats = getMobStats(type, level);
+        auto mobSize = mobStats->getSize();
 
-        float mobX = utils::getRandomReal<float>(minSpawnX, maxSpawnX);
-        float mobY = utils::getRandomReal<float>(minSpawnY, maxSpawnY);
+        float minSpawnX = spawnCenterX - spawnWidth / 2.0f + mobSize.x / 2.0f;
+        float maxSpawnX = spawnCenterX + spawnWidth / 2.0f - mobSize.x / 2.0f;
 
-        spawnMobAt(m_CurrentMobID, type, level, sender, mobX, mobY, enemyMobSpawn->direction);
+        float minSpawnY = spawnCenterY - spawnHeight / 2.0f + mobSize.y / 2.0f;
+        float maxSpawnY = spawnCenterY + spawnHeight / 2.0f - mobSize.y / 2.0f;
 
-        protocol::SpawnMobPacket packet(m_CurrentMobID, type, level, sender, mobX, mobY, enemyMobSpawn->direction);
+        float mobX = utils::getRandomReal<float>(minSpawnX + MobSpawnBorder, maxSpawnX - MobSpawnBorder);
+        float mobY = utils::getRandomReal<float>(minSpawnY + MobSpawnBorder, maxSpawnY - MobSpawnBorder);
+
+        spawnMobAt(m_CurrentMobID, type, level, sender, mobX, mobY, enemyMobSpawn->getDirection());
+
+        protocol::SpawnMobPacket packet(m_CurrentMobID, type, level, sender, mobX, mobY, enemyMobSpawn->getDirection());
         m_Server->broadcastPacket(&packet);
 
         m_CurrentMobID++;
@@ -49,9 +55,5 @@ game::TowerPtr ServerWorld::placeTowerAt(game::TowerType type, std::int32_t x, s
     return tower;
 }
 
-void ServerWorld::OnArrowShot(game::MobPtr target, game::Tower* shooter) {
-    World::OnArrowShot(target, shooter);
-}
-
 } // namespace server
 } // namespace td

src/misc/Shapes.cpp

@@ -0,0 +1,84 @@
+#include "misc/Shapes.h"
+
+#include <algorithm>
+#include <cmath>
+
+namespace td {
+namespace utils {
+namespace shape {
+
+float Point::distance(const Point& point) const {
+    return std::sqrt(distanceSquared(point));
+}
+
+float Point::distanceSquared(const Point& point) const {
+    return (m_X - point.getX()) * (m_X - point.getX()) + (m_Y - point.getY()) * (m_Y - point.getY());
+}
+
+
+bool Rectangle::collidesWith(const Point& point) const {
+    return point.getX() > getTopLeft().getX() && point.getX() < getBottomRight().getX() &&
+        point.getY() > getTopLeft().getY() && point.getY() < getBottomRight().getY();
+}
+
+bool Rectangle::collidesWith(const Rectangle& rect) const {
+    Point point1{ rect.getTopLeft().getX(), rect.getTopLeft().getY() };
+    Point point2{ rect.getTopLeft().getX(), rect.getBottomRight().getY() };
+    Point point3{ rect.getBottomRight().getX(), rect.getTopLeft().getY() };
+    Point point4{ rect.getBottomRight().getX(), rect.getBottomRight().getY() };
+
+    if (collidesWith(point1)) return true;
+    if (collidesWith(point2)) return true;
+    if (collidesWith(point3)) return true;
+    if (collidesWith(point4)) return true;
+
+    return false;
+}
+
+bool Rectangle::collidesWith(const Circle& circle) const {
+    return circle.collidesWith(*this);
+}
+
+float Rectangle::distance(const Circle& circle) const {
+    return circle.distance(*this);
+}
+
+float Rectangle::distanceSquared(const Circle& circle) const {
+    return circle.distanceSquared(*this);
+}
+
+
+
+
+
+bool Circle::collidesWith(const Point& point) const {
+    return m_Radius * m_Radius > m_Center.distanceSquared(point);
+}
+
+bool Circle::collidesWith(const Rectangle& rect) const {
+    float distanceSquared_ = distanceSquared(rect);
+
+    return distanceSquared_ < m_Radius* m_Radius;
+}
+
+bool Circle::collidesWith(const Circle& circle) const {
+    return m_Radius + circle.getRadius() > m_Center.distanceSquared(circle.getCenter());
+}
+
+float Circle::distance(const Rectangle& rect) const {
+    return std::sqrt(distanceSquared(rect));
+}
+
+float Circle::distanceSquared(const Rectangle& rect) const {
+    float closestX = std::clamp(m_Center.getX(), rect.getTopLeft().getX(), rect.getBottomRight().getX());
+    float closestY = std::clamp(m_Center.getY(), rect.getTopLeft().getY(), rect.getBottomRight().getY());
+
+    float distanceX = m_Center.getX() - closestX;
+    float distanceY = m_Center.getY() - closestY;
+
+    return (distanceX * distanceX) + (distanceY * distanceY);
+}
+
+} // namespace shape
+} // namespace utils
+} // namespace td

src/misc/Time.cpp

@@ -55,7 +55,7 @@ void CooldownTimer::reset() {
     m_Cooldown = 0; // let the timer active once at the beginning
 }
 
-void CooldownTimer::applyCooldown(){
+void CooldownTimer::applyCooldown() {
     m_Cooldown = m_CooldownTime;
 }
 

src/protocol/PacketFactory.cpp

@@ -6,7 +6,7 @@ namespace td {
 namespace protocol {
 namespace PacketFactory {
 
-using PacketCreator = std::function<PacketPtr ()>;
+using PacketCreator = std::function<PacketPtr()>;
 
 static std::map<PacketType, PacketCreator> packets = {
     {PacketType::PlayerLogin,       []() -> PacketPtr {return std::make_unique<PlayerLoginPacket>();} },
@@ -28,7 +28,7 @@ static std::map<PacketType, PacketCreator> packets = {
     {PacketType::SpawnMob,          []() -> PacketPtr {return std::make_unique<SpawnMobPacket>(); } },
     {PacketType::PlaceTower,        []() -> PacketPtr {return std::make_unique<PlaceTowerPacket>(); } },
     {PacketType::WorldAddTower,     []() -> PacketPtr {return std::make_unique<WorldAddTowerPacket>(); } },
-    {PacketType::WorldRemoveTower,  []() -> PacketPtr {return std::make_unique<WorldRemoveTowerPacket>(); } },
+    {PacketType::RemoveTower,       []() -> PacketPtr {return std::make_unique<RemoveTowerPacket>(); } },
     {PacketType::SendMobs,          []() -> PacketPtr {return std::make_unique<SendMobsPacket>(); } },
     {PacketType::UpgradeTower,      []() -> PacketPtr {return std::make_unique<UpgradeTowerPacket>(); } },
 };

src/protocol/Protocol.cpp

@@ -94,11 +94,11 @@ DataBuffer WorldBeginDataPacket::SerializeCustom() const {
     const game::Spawn& redSpawn = m_Header.m_RedSpawn, blueSpawn = m_Header.m_BlueSpawn;
     const game::TeamCastle& redCastle = m_Header.m_RedCastle, blueCastle = m_Header.m_BlueCastle;
 
-    data << redSpawn << redCastle;
-    data << blueSpawn << blueCastle;
+    data << redSpawn << static_cast<utils::shape::Rectangle>(redCastle);
+    data << blueSpawn << static_cast<utils::shape::Rectangle>(blueCastle);
 
     // tile palette
-    data << m_Header.m_TilePalette.size();
+    data << static_cast<std::uint64_t>(m_Header.m_TilePalette.size());
 
     for (game::TilePtr tile : m_Header.m_TilePalette) {
         data << tile;
@@ -126,11 +126,11 @@ DataBuffer WorldBeginDataPacket::Serialize() const {
     const game::Spawn& redSpawn = m_Header.m_World->getRedTeam().getSpawn(), blueSpawn = m_Header.m_World->getBlueTeam().getSpawn();
     const game::TeamCastle& redCastle = m_Header.m_World->getRedTeam().getCastle(), blueCastle = m_Header.m_World->getBlueTeam().getCastle();
 
-    data << redSpawn << redCastle;
-    data << blueSpawn << blueCastle;
+    data << redSpawn << static_cast<utils::shape::Rectangle>(redCastle);
+    data << blueSpawn << static_cast<utils::shape::Rectangle>(blueCastle);
 
     // tile palette
-    data << m_Header.m_World->getTilePalette().size();
+    data << static_cast<std::uint64_t>(m_Header.m_World->getTilePalette().size());
 
     for (game::TilePtr tile : m_Header.m_World->getTilePalette()) {
         data << tile;
@@ -155,8 +155,13 @@ void WorldBeginDataPacket::Deserialize(DataBuffer& data) {
 
     data.SetReadOffset(data.GetReadOffset() + decoPalletteSizeByte);
 
-    data >> m_Header.m_RedSpawn >> m_Header.m_RedCastle;
-    data >> m_Header.m_BlueSpawn >> m_Header.m_BlueCastle;
+    utils::shape::Rectangle redCastle, blueCastle;
+
+    data >> m_Header.m_RedSpawn >> redCastle;
+    data >> m_Header.m_BlueSpawn >> blueCastle;
+
+    m_Header.m_RedCastle.setShape(redCastle);
+    m_Header.m_BlueCastle.setShape(blueCastle);
 
     std::uint64_t tilePaletteSize;
     data >> tilePaletteSize;
@@ -485,20 +490,20 @@ void WorldAddTowerPacket::Deserialize(DataBuffer& data) {
     data >> m_TowerID >> m_TowerX >> m_TowerY >> m_TowerType >> m_Builder;
 }
 
-DataBuffer WorldRemoveTowerPacket::Serialize() const {
+DataBuffer RemoveTowerPacket::Serialize() const {
     DataBuffer data;
     data << getID() << m_TowerID;
     return data;
 }
 
-void WorldRemoveTowerPacket::Deserialize(DataBuffer& data) {
+void RemoveTowerPacket::Deserialize(DataBuffer& data) {
     data >> m_TowerID;
 }
 
 DataBuffer SendMobsPacket::Serialize() const {
     DataBuffer data;
     data << getID() << static_cast<std::uint8_t>(m_MobSends.size());
-    for(const MobSend& mobSend : m_MobSends){
+    for (const MobSend& mobSend : m_MobSends) {
         data << mobSend;
     }
     return data;
@@ -508,7 +513,7 @@ void SendMobsPacket::Deserialize(DataBuffer& data) {
     std::uint8_t mobSendCount;
     data >> mobSendCount;
     protocol::MobSend mobSend;
-    for(int i = 0; i < mobSendCount; i++){
+    for (int i = 0; i < mobSendCount; i++) {
         data >> mobSend;
         m_MobSends.push_back(mobSend);
     }
@@ -543,7 +548,7 @@ REGISTER_DISPATCH_CLASS(ServerTpsPacket);
 REGISTER_DISPATCH_CLASS(SpawnMobPacket);
 REGISTER_DISPATCH_CLASS(PlaceTowerPacket);
 REGISTER_DISPATCH_CLASS(WorldAddTowerPacket);
-REGISTER_DISPATCH_CLASS(WorldRemoveTowerPacket);
+REGISTER_DISPATCH_CLASS(RemoveTowerPacket);
 REGISTER_DISPATCH_CLASS(SendMobsPacket);
 REGISTER_DISPATCH_CLASS(UpgradeTowerPacket);
 

src/render/Renderer.cpp

@@ -43,9 +43,9 @@ void Renderer::initShader() {
 }
 
 bool Renderer::init() {
-    #ifndef ANDROID
+#ifndef ANDROID
     glbinding::Binding::initialize();
-    #endif
+#endif
     glEnable(GL_TEXTURE_2D);
     glEnable(GL_BLEND);
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

src/render/VertexCache.cpp

@@ -5,46 +5,43 @@ namespace td {
 namespace render {
 
 void VertexCache::addData(std::uint64_t index, std::vector<float> positions, std::vector<float> colors) {
-    ElementsIndex positionsIndexes;
-    positionsIndexes.first = m_Positions.end();
-    m_Positions.insert(m_Positions.end(), positions.begin(), positions.end());
-    positionsIndexes.second = m_Positions.end() - 1;
-
-    ElementsIndex colorsIndexes;
-    colorsIndexes.first = m_Colors.end();
-    m_Colors.insert(m_Colors.end(), colors.begin(), colors.end());
-    colorsIndexes.second = m_Colors.end() - 1;
-
-    m_Indexes.insert({ index, {positionsIndexes, colorsIndexes} });
+    m_Indexes.insert({ index, {positions, colors} });
+    m_VertexCount += colors.size(); // one color per vertex
 }
 
 void VertexCache::removeData(std::uint64_t index) {
     auto it = m_Indexes.find(index);
     if (it != m_Indexes.end()) {
-        DataIndex indexes = it->second;
-        ElementsIndex positionsIndexes = indexes.first;
-        ElementsIndex colorsIndexes = indexes.second;
-
-        m_Positions.erase(positionsIndexes.first, positionsIndexes.second);
-        m_Colors.erase(colorsIndexes.first, colorsIndexes.second);
-
         m_Indexes.erase(it);
+        m_VertexCount -= it->second.color.size(); // one color per vertex
     }
 }
 
 void VertexCache::clear() {
-    m_Positions.clear();
-    m_Colors.clear();
     m_Indexes.clear();
+    m_VertexCount = 0;
 }
 
 void VertexCache::updateVertexArray() {
-    m_VertexArray = std::make_unique<GL::VertexArray>(m_Colors.size()); // one color per vertex
+    m_VertexArray = std::make_unique<GL::VertexArray>(m_VertexCount); // one color per vertex
 
-    GL::VertexBuffer positionsBuffer(m_Positions, 2);
+    Vector positions;
+    positions.reserve(m_VertexCount * 2);
+
+    Vector colors;
+    colors.reserve(m_VertexCount);
+
+    for (auto it = m_Indexes.begin(); it != m_Indexes.end(); it++) {
+        const DataIndex& data = it->second;
+
+        positions.insert(positions.end(), data.position.begin(), data.position.end());
+        colors.insert(colors.end(), data.color.begin(), data.color.end());
+    }
+
+    GL::VertexBuffer positionsBuffer(positions, 2);
     positionsBuffer.addVertexAttribPointer(0, 2, 0);
 
-    GL::VertexBuffer colorsBuffer(m_Colors, 1);
+    GL::VertexBuffer colorsBuffer(colors, 1);
     colorsBuffer.addVertexAttribPointer(1, 1, 0);
 
     m_VertexArray->bind();

src/render/WorldRenderer.cpp

@@ -37,6 +37,8 @@ WorldRenderer::WorldRenderer(game::World* world, client::ClientGame* client) : m
     m_Renderer->setCamMovement({});
     m_TowerPlacePopup = std::make_unique<gui::TowerPlacePopup>(m_Client->getClient());
     m_MobTooltip = std::make_unique<gui::MobTooltip>(m_Client->getClient());
+    m_CastleTooltip = std::make_unique<gui::CastleTooltip>(m_Client->getClient());
+    m_Client->getWorld().getWorldNotifier().bindListener(this);
 }
 
 void WorldRenderer::updateCursorPos() {
@@ -64,6 +66,18 @@ void WorldRenderer::update() {
             m_PopupOpened = false;
         }
     }
+
+    if (ImGui::IsMouseDoubleClicked(1)) removeTower();
+}
+
+void WorldRenderer::removeTower() {
+    glm::vec2 cursorPos = getCursorWorldPos();
+
+    game::TowerPtr clickedTower = m_World->getTower(cursorPos);
+
+    if (clickedTower != nullptr) {
+        m_Client->getClient()->removeTower(clickedTower->getID());
+    }
 }
 
 void WorldRenderer::renderWorld() const {
@@ -74,7 +88,7 @@ void WorldRenderer::renderMobs() const {
     for (game::MobPtr mob : m_World->getMobList()) {
         Renderer::Model model;
         model.vao = m_MobVao.get();
-        model.positon = { mob->getX(), mob->getY() };
+        model.positon = { mob->getCenterX(), mob->getCenterY() };
         m_Renderer->renderModel(model);
     }
 }
@@ -85,7 +99,7 @@ void WorldRenderer::renderTowers() const {
 }
 
 void WorldRenderer::renderTileSelect() const {
-    if(ImGui::IsAnyItemHovered()) return;
+    if (ImGui::IsAnyItemHovered()) return;
 
     Renderer::Model tileSelectModel;
     tileSelectModel.vao = m_SelectTileVao.get();
@@ -106,7 +120,7 @@ void WorldRenderer::render() {
     renderMobs();
     renderTowers();
     renderTileSelect();
-    renderMobTooltip();
+    renderTooltips();
     renderPopups();
     detectClick();
 }
@@ -115,6 +129,11 @@ WorldRenderer::~WorldRenderer() {
 
 }
 
+void WorldRenderer::renderTooltips() const {
+    renderMobTooltip();
+    renderCastleTooltip();
+}
+
 void WorldRenderer::moveCam(float relativeX, float relativeY, float aspectRatio) {
     if (m_WorldVao == nullptr)
         return;
@@ -180,8 +199,8 @@ void WorldRenderer::renderTowerUpgradePopup() {
                 bool alreadyUpgraded = currentLevel <= towerLevel;
                 bool canUpgrade = (towerLevel + 1) == currentLevel;
 
-                if(canUpgrade && towerPath != game::TowerPath::Base){
-                    if(currentPath != towerPath){
+                if (canUpgrade && towerPath != game::TowerPath::Base) {
+                    if (currentPath != towerPath) {
                         canUpgrade = false;
                     }
                 }
@@ -199,7 +218,7 @@ void WorldRenderer::renderTowerUpgradePopup() {
                     ImGui::EndDisabled();
                 } else if (canUpgrade) {
                     if (ImGui::Button("Upgrade", ImVec2(100, 100))) {
-                        m_Client->getClient()->upgradeTower(tower->getID(), {currentLevel, currentPath});
+                        m_Client->getClient()->upgradeTower(tower->getID(), { currentLevel, currentPath });
                     }
                 } else {
                     ImGui::BeginDisabled();
@@ -226,20 +245,23 @@ void WorldRenderer::detectClick() {
 }
 
 void WorldRenderer::renderMobTooltip() const {
-    if(ImGui::IsAnyItemHovered()) return;
+    if (ImGui::IsAnyItemHovered()) return;
 
     detectMobHovering();
     m_MobTooltip->render();
 }
 
+void WorldRenderer::renderCastleTooltip() const {
+    if (ImGui::IsAnyItemHovered()) return;
+
+    detectCastleHovering();
+    m_CastleTooltip->render();
+}
+
 void WorldRenderer::detectMobHovering() const {
     glm::vec2 cursorWorldPos = getCursorWorldPos();
     for (game::MobPtr mob : m_World->getMobList()) {
-        // mob size is currently 1x1 for all mobs
-        float mobCenterX = mob->getX();
-        float mobCenterY = mob->getY();
-        if (cursorWorldPos.x > mobCenterX - 0.5f && cursorWorldPos.x < mobCenterX + 0.5f
-            && cursorWorldPos.y > mobCenterY - 0.5f && cursorWorldPos.y < mobCenterY + 0.5f) {
+        if (mob->collidesWith({ cursorWorldPos.x, cursorWorldPos.y })) {
             m_MobTooltip->setMob(mob.get());
             return;
         }
@@ -247,13 +269,24 @@ void WorldRenderer::detectMobHovering() const {
     m_MobTooltip->setMob(nullptr);
 }
 
-void WorldRenderer::addTower(game::TowerPtr tower) {
-    const WorldLoader::RenderData& renderData = WorldLoader::loadTowerModel(tower);
+void WorldRenderer::detectCastleHovering() const {
+    glm::vec2 cursorWorldPos = getCursorWorldPos();
+    for (const game::Team& team : m_World->getTeams()) {
+        if (team.getCastle().collidesWith({ cursorWorldPos.x, cursorWorldPos.y })) {
+            m_CastleTooltip->setCastle(&team.getCastle());
+            return;
+        }
+    }
+    m_CastleTooltip->setCastle(nullptr);
+}
+
+void WorldRenderer::OnTowerAdd(game::TowerPtr tower) {
+    WorldLoader::RenderData renderData = WorldLoader::loadTowerModel(tower);
     m_TowersCache.addData(tower->getID(), renderData.positions, renderData.colors);
     m_TowersCache.updateVertexArray();
 }
 
-void WorldRenderer::removeTower(game::TowerPtr tower) {
+void WorldRenderer::OnTowerRemove(game::TowerPtr tower) {
     m_TowersCache.removeData(tower->getID());
     m_TowersCache.updateVertexArray();
 }

src/render/gui/CastleTooltip.cpp

@@ -0,0 +1,27 @@
+#include "render/gui/CastleTooltip.h"
+#include "render/gui/imgui/imgui.h"
+
+#include "render/WorldRenderer.h"
+
+#include "game/client/Client.h"
+
+namespace td {
+namespace gui {
+
+CastleTooltip::CastleTooltip(client::Client* client) : GuiWidget(client) {
+
+}
+
+void CastleTooltip::render() {
+    if (m_Castle == nullptr) return;
+
+    ImGui::BeginTooltip();
+    ImGui::PushStyleColor(ImGuiCol_Text, render::WorldRenderer::getImGuiTeamColor(m_Castle->getTeam()->getColor()));
+    ImGui::Text("Castle : ");
+    ImGui::PopStyleColor();
+    ImGui::Text("\tCastle HP : %i/%i", static_cast<int>(m_Castle->getLife()), game::TeamCastle::CastleMaxLife);
+    ImGui::EndTooltip();
+}
+
+} // namespace gui
+} // namespace td

src/render/gui/FrameMenu.cpp

@@ -8,7 +8,7 @@
 namespace td {
 namespace gui {
 
-FrameMenu::FrameMenu(client::Client* client) : GuiWidget(client), m_VSync(true), m_IsometricView(true), m_ShowDemoWindow(false){
+FrameMenu::FrameMenu(client::Client* client) : GuiWidget(client), m_VSync(true), m_IsometricView(true), m_ShowDemoWindow(false) {
 
 }
 
@@ -24,7 +24,7 @@ void FrameMenu::render() {
     ImGui::Checkbox("Demo Window", &m_ShowDemoWindow);
     ImGui::End();
 
-    if(m_ShowDemoWindow)
+    if (m_ShowDemoWindow)
         ImGui::ShowDemoWindow(&m_ShowDemoWindow);
 }
 

src/render/gui/GameMenu.cpp

@@ -13,7 +13,7 @@ GameMenu::GameMenu(client::Client* client) : GuiWidget(client), m_SummonMenu(std
 
 }
 
-void GameMenu::render(){
+void GameMenu::render() {
     if (getClient()->getGame().getGameState() == td::game::GameState::Lobby) {
         ImGui::Begin("Lobby");
 

src/render/gui/MainMenu.cpp

@@ -12,8 +12,8 @@ MainMenu::MainMenu(client::Client* client) : GuiWidget(client), m_ConnectPort(25
     m_ConnectAddress.reserve(256);
 }
 
-MainMenu::~MainMenu(){
-    if(m_Server != nullptr)
+MainMenu::~MainMenu() {
+    if (m_Server != nullptr)
         m_Server->stop();
 }
 
@@ -71,7 +71,7 @@ void MainMenu::render() {
     ImGui::End();
 }
 
-bool MainMenu::startServer(){
+bool MainMenu::startServer() {
     if (m_WorldFilePath.empty())
         return false;
     m_Server = std::make_unique<td::server::Server>(m_WorldFilePath);

src/render/gui/MobTooltip.cpp

@@ -17,12 +17,14 @@ MobTooltip::MobTooltip(client::Client* client) : GuiWidget(client) {
 void MobTooltip::render() {
     if (m_Mob == nullptr) return;
 
-    const game::Player& sender = getClient()->getGame().getPlayerById(m_Mob->getSender());
+    // TODO: add sender null check
+
+    const game::Player* sender = getClient()->getGame().getPlayerById(m_Mob->getSender());
     ImGui::BeginTooltip();
     ImGui::Text("Sender :");
     ImGui::SameLine();
-        ImGui::PushStyleColor(ImGuiCol_Text, render::WorldRenderer::getImGuiTeamColor(sender.getTeamColor()));
-        ImGui::Text("%s", sender.getName().c_str());
+    ImGui::PushStyleColor(ImGuiCol_Text, render::WorldRenderer::getImGuiTeamColor(sender->getTeamColor()));
+    ImGui::Text("%s", sender->getName().c_str());
     ImGui::PopStyleColor();
     ImGui::Text("Mob HP : %.1f/%i", m_Mob->getHealth(), m_Mob->getStats()->getMaxLife());
     ImGui::Text("Mob Type : %s", game::MobFactory::getMobName(m_Mob->getType()).c_str());

src/render/gui/SummonMenu.cpp

@@ -5,11 +5,11 @@
 namespace td {
 namespace gui {
 
-SummonMenu::SummonMenu(client::Client* client) : GuiWidget(client), m_MenuOpened(true){
+SummonMenu::SummonMenu(client::Client* client) : GuiWidget(client), m_MenuOpened(true) {
     m_Values.fill(0);
 }
 
-void SummonMenu::render(){
+void SummonMenu::render() {
     if (m_MenuOpened) {
         ImGui::Begin("Summon", &m_MenuOpened);
         ImTextureID my_tex_id = ImGui::GetIO().Fonts->TexID;
@@ -51,8 +51,8 @@ void SummonMenu::render(){
         if (ImGui::Button("Send")) {
             std::vector<protocol::MobSend> mobSent;
             protocol::MobSend mobSend;
-            for(int i = 0; i < m_MobTypeCount; i++){
-                if(m_Values[i] != 0){
+            for (int i = 0; i < m_MobTypeCount; i++) {
+                if (m_Values[i] != 0) {
                     mobSend.mobCount = m_Values[i];
                     mobSend.mobLevel = 1;   // TODO: add mob levels
                     mobSend.mobType = td::game::MobType(i);
@@ -66,7 +66,7 @@ void SummonMenu::render(){
     }
 }
 
-void SummonMenu::setSummonMax(int valueIndex){
+void SummonMenu::setSummonMax(int valueIndex) {
     int& value = m_Values[valueIndex];
     value = std::max(0, value);
     value = std::min(12, value);

src/render/gui/TowerGui.cpp

@@ -29,7 +29,7 @@ void TowerGui::initWidgets() {
 }
 
 TowerGui::TowerGui(SDL_Window* sdl_window, SDL_GLContext glContext, td::render::Renderer* renderer) : m_Window(sdl_window),
-    m_GlContext(glContext), m_Renderer(renderer), m_Client(std::make_unique<client::Client>(m_Renderer)) {
+m_GlContext(glContext), m_Renderer(renderer), m_Client(std::make_unique<client::Client>(m_Renderer)) {
     IMGUI_CHECKVERSION();
     ImGui::CreateContext();
     ImGui::StyleColorsDark();

src/render/gui/TowerPlacePopup.cpp

@@ -44,7 +44,7 @@ void TowerPlacePopup::render() {
                 ImGui::SetCursorPosY(m_TowerPopupTileHeight - m_PlaceTowerButtonHeight - 10);
                 ImGui::SetCursorPosX(m_TowerPopupTileWidth / 2.0f - m_PlaceTowerButtonWidth / 2.0f);
 
-                if(ImGui::Button(buyText.c_str(), ImVec2(m_PlaceTowerButtonWidth, m_PlaceTowerButtonHeight))){
+                if (ImGui::Button(buyText.c_str(), ImVec2(m_PlaceTowerButtonWidth, m_PlaceTowerButtonHeight))) {
                     getClient()->placeTower(towerType, m_ClickWorldPos);
                     ImGui::CloseCurrentPopup();
                 }

src/render/gui/UpdateMenu.cpp

@@ -20,18 +20,18 @@ void UpdateMenu::render() {
             bool updateAvailable = m_UpdateAvailable.get();
             if (updateAvailable) {
 
-                if(m_Updater.isFileWrited()){
+                if (m_Updater.isFileWrited()) {
                     ImGui::Text("The update is now installed");
                     ImGui::Text("The game needs to be restarted");
-                }else if (m_Updater.isDownloadComplete()) {
+                } else if (m_Updater.isDownloadComplete()) {
                     ImGui::Text("Download done!");
-                    if(ImGui::Button("Install")){
-                        if(!m_Updater.writeFile()){
+                    if (ImGui::Button("Install")) {
+                        if (!m_Updater.writeFile()) {
                             m_Error = "Failed to write file !\n";
                             ImGui::OpenPopup("UpdateError");
                         }
                     }
-                    if(ImGui::Button("Cancel")){
+                    if (ImGui::Button("Cancel")) {
                         m_Updater.cancelDownload();
                         m_Updater.clearCache();
                     }
@@ -50,13 +50,13 @@ void UpdateMenu::render() {
 
                         bool canDownloadFile = m_Updater.canUpdate();
 
-                        if(!canDownloadFile) ImGui::BeginDisabled();
+                        if (!canDownloadFile) ImGui::BeginDisabled();
 
                         if (ImGui::Button("Download")) {
                             m_Updater.downloadUpdate();
                         }
 
-                        if(!canDownloadFile) ImGui::EndDisabled();
+                        if (!canDownloadFile) ImGui::EndDisabled();
 
                         ImGui::SameLine();
                         if (ImGui::Button("Cancel")) {
@@ -77,8 +77,8 @@ void UpdateMenu::render() {
     }
 }
 
-void UpdateMenu::renderErrorPopup(){
-    if(ImGui::BeginPopup("UpdateError")){
+void UpdateMenu::renderErrorPopup() {
+    if (ImGui::BeginPopup("UpdateError")) {
         ImGui::Text("Error : %s", m_Error.c_str());
         ImGui::EndPopup();
     }

src/render/loader/WorldLoader.cpp

@@ -97,8 +97,8 @@ GL::VertexArray loadWorldModel(const td::game::World* world) {
 
     for (int spawnColor = 0; spawnColor < 2; spawnColor++) {
         const game::Spawn& spawn = world->getTeam(game::TeamColor(spawnColor)).getSpawn();
-        float fromX = spawn.x - 2, toX = spawn.x + 3;
-        float fromY = spawn.y - 2, toY = spawn.y + 3;
+        float fromX = spawn.getTopLeft().getX() , toX = spawn.getBottomRight().getX();
+        float fromY = spawn.getTopLeft().getY() , toY = spawn.getBottomRight().getY();
 
         positions.insert(positions.end(), {
             fromX, fromY,
@@ -125,8 +125,8 @@ GL::VertexArray loadWorldModel(const td::game::World* world) {
 
     for (int castleColor = 0; castleColor < 2; castleColor++) {
         const game::TeamCastle& castle = world->getTeam(game::TeamColor(castleColor)).getCastle();
-        float fromX = castle.x - 2, toX = castle.x + 3;
-        float fromY = castle.y - 2, toY = castle.y + 3;
+        float fromX = castle.getTopLeft().getX(), toX = castle.getBottomRight().getX();
+        float fromY = castle.getTopLeft().getY(), toY = castle.getBottomRight().getY();
 
         positions.insert(positions.end(), {
             fromX, fromY,
@@ -203,17 +203,17 @@ RenderData loadTowerModel(game::TowerPtr tower) {
     float towerY, towerDY;
 
     if (tower->getSize() == game::TowerSize::Little) {
-        towerX = tower->getX() - 1;
-        towerDX = tower->getX() + 2;
+        towerX = tower->getCenterX() - 1.5f;
+        towerDX = tower->getCenterX() + 1.5f;
 
-        towerY = tower->getY() - 1;
-        towerDY = tower->getY() + 2;
+        towerY = tower->getCenterY() - 1.5f;
+        towerDY = tower->getCenterY() + 1.5f;
     } else {
-        towerX = tower->getX() - 2;
-        towerDX = tower->getX() + 3;
+        towerX = tower->getCenterX() - 2.5f;
+        towerDX = tower->getCenterX() + 2.5f;
 
-        towerY = tower->getY() - 2;
-        towerDY = tower->getY() + 3;
+        towerY = tower->getCenterY() - 2.5f;
+        towerDY = tower->getCenterY() + 2.5f;
     }
     std::vector<float> positions = {
         towerX, towerY,

src/render/shaders/ShaderProgram.cpp

@@ -116,9 +116,9 @@ int ShaderProgram::loadShader(const std::string& source, GLenum type) {
         char error[size];
         glGetShaderInfoLog(shaderID, size, &size, error);
         std::cout << error << std::endl;
-        #ifdef __ANDROID__
+#ifdef __ANDROID__
         __android_log_print(ANDROID_LOG_ERROR, "TRACKERS", "Could not compile shader !\n %s", error);
-        #endif
+#endif
     }
     return shaderID;
 }

src/updater/Updater.cpp

@@ -1,4 +1,5 @@
-#include "misc/Updater.h"
+#include "updater/Updater.h"
+
 #include "misc/Platform.h"
 #include "misc/DataBuffer.h"
 

xmake.lua

@@ -8,7 +8,7 @@ target("TowerDefense")
     add_files("src/*.cpp", "src/*/*.cpp", "src/*/*/*.cpp", "src/*/*/*/*.cpp")
     add_cxflags("-pthread")
 
-    set_languages("c++14")
+    set_languages("c++17")
 
     add_links("glbinding", "z", "SDL2")
 
@@ -35,6 +35,12 @@ target("TowerDefense")
         end
 
     else
+        if is_os("linux") then
+            add_links("dw")
+        end
+        if is_os("windows") then
+            add_links("dbghelp", "psapi", "kernel32", "msvcr90")
+        end
         add_cxflags("-pedantic -Wall -Wextra -Wcast-align -Wcast-qual -Wctor-dtor-privacy -Wdisabled-optimization -Wformat=2 -Winit-self -Wlogical-op -Wmissing-declarations -Wmissing-include-dirs -Wnoexcept -Wold-style-cast -Woverloaded-virtual -Wredundant-decls -Wshadow -Wsign-conversion -Wsign-promo -Wstrict-null-sentinel -Wstrict-overflow=5 -Wswitch-default -Wundef -Wno-unused")
     end