feat: implement freeze effect

include/game/Mobs.h

@@ -34,6 +34,7 @@ typedef std::uint32_t MobID;
 typedef std::uint8_t MobLevel;
 typedef std::vector<TowerType> TowerImmunities;
 typedef std::vector<EffectType> EffectImmunities;
+typedef std::pair<EffectType, float> EffectDuration;
 
 class MobStats {
 private:
@@ -71,6 +72,7 @@ private:
     PlayerID m_Sender;
     MobLevel m_Level;
     Direction m_Direction;
+    std::vector<EffectDuration> m_Effects;
 
     float m_X = 0, m_Y = 0;
 public:
@@ -80,7 +82,7 @@ public:
 
     virtual MobType getType() const = 0;
 
-    virtual void tick(std::uint64_t delta) {}
+    virtual void tick(std::uint64_t delta);
 
     const TowerImmunities& getTowerImmunities() const { return getMobTowerImmunities(getType(), m_Level); }
     const EffectImmunities& getEffectImmunities() const { return getMobEffectImmunities(getType(), m_Level); }
@@ -99,10 +101,19 @@ public:
     float getY() const { return m_Y; }
     void setY(float y) { m_Y = y; }
 
+    bool isImmuneTo(TowerType type);
+
+    bool isImmuneTo(EffectType type);
+    void addEffect(EffectType type, float durationSec);
+    bool hasEffect(EffectType type);
+
+
     Direction getDirection() const { return m_Direction; }
     void setDirection(Direction dir) { m_Direction = dir; }
 protected:
     void initHealth() { m_Health = (float)getStats()->getMaxLife(); }
+private:
+    void updateEffects(std::uint64_t delta);
 };
 
 typedef std::shared_ptr<Mob> MobPtr;

include/game/World.h

@@ -187,6 +187,7 @@ public:
     virtual void OnArrowShot(MobPtr target, Tower* shooter);
 private:
     void moveMobs(std::uint64_t delta);
+    void tickMobs(std::uint64_t delta);
     void cleanDeadMobs();
 };
 

src/game/Mobs.cpp

@@ -1,9 +1,53 @@
 #include "game/Mobs.h"
+
 #include <map>
+#include <algorithm>
 
 namespace td {
 namespace game {
 
+bool Mob::isImmuneTo(TowerType type) {
+    return std::find(getTowerImmunities().begin(), getTowerImmunities().end(), type) != getTowerImmunities().end();
+}
+
+bool Mob::isImmuneTo(EffectType type) {
+    return std::find(getEffectImmunities().begin(), getEffectImmunities().end(), type) != getEffectImmunities().end();
+}
+
+void Mob::addEffect(EffectType effectType, float durationSec) {
+    if (isImmuneTo(effectType))
+        return;
+    if (hasEffect(effectType)) {
+        auto it = std::find_if(m_Effects.begin(), m_Effects.end(), [&effectType](EffectDuration effect){ return effect.first == effectType;});
+        EffectDuration& effect = *it;
+        if(effect.second < durationSec)
+            effect.second = durationSec;    // setting new duration if it's greater then the actual
+    } else {
+        m_Effects.push_back({ effectType, durationSec });
+    }
+}
+
+void Mob::tick(std::uint64_t delta) {
+    updateEffects(delta);
+}
+
+void Mob::updateEffects(std::uint64_t delta) {
+    float deltaSec = (float)delta / 1000.0f;
+    for (auto it = m_Effects.begin(); it != m_Effects.end(); it++) {
+        EffectDuration& effect = *it;
+        effect.second -= deltaSec;
+        if (effect.second < 0)   // effect has gone
+            m_Effects.erase(it);
+    }
+}
+
+bool Mob::hasEffect(EffectType type) {
+    return std::find_if(m_Effects.begin(), m_Effects.end(), [&type](EffectDuration effect){ return effect.first == type;}) != m_Effects.end();
+}
+
+
+
+
 typedef std::pair<MobType, std::uint8_t> MobKey;
 
 const std::map<MobKey, MobStats> MobConstants = {

src/game/Towers.cpp

@@ -28,7 +28,7 @@ const std::map<std::pair<TowerType, TowerLevel>, TowerStats> TowerConstants = {
     {{TowerType::Ice, {1, TowerPath::Top}}, {1, 0, 10}},
     {{TowerType::Ice, {2, TowerPath::Top}}, {1, 0, 12}},
     {{TowerType::Ice, {3, TowerPath::Top}}, {1, 0, 13}},
-    {{TowerType::Ice, {4, TowerPath::Top}}, {1, 0, 15}},
+    {{TowerType::Ice, {4, TowerPath::Top}}, {1, 4, 15}},
 
     //-----------------------------------------------------------------
 
@@ -183,7 +183,15 @@ void ArcherTower::tick(std::uint64_t delta, World* world) {
 }
 
 void IceTower::tick(std::uint64_t delta, World* world) {
-
+    if (m_Timer.update(delta)) {
+        float damage = getStats()->getDamage();
+        for (MobPtr mob : world->getMobList()) {
+            if (isMobInRange(mob)) {
+                mob->addEffect(EffectType::Slowness, 1);    // slowness for 1s every second
+                mob->damage(damage);
+            }
+        }
+    }
 }
 
 void MageTower::tick(std::uint64_t delta, World* world) {

src/game/World.cpp

@@ -321,6 +321,7 @@ 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);
     }
@@ -341,6 +342,12 @@ 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);
+    }
+}
+
 void World::moveMobs(std::uint64_t delta) {
     for (MobPtr mob : m_Mobs) {
         TilePtr tile = getTile(mob->getX(), mob->getY());
@@ -354,6 +361,9 @@ void World::moveMobs(std::uint64_t delta) {
 
         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);