feat: implement freeze effect

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

@@ -7,7 +7,7 @@ namespace td {
 namespace game {
 
 bool Tower::isMobInRange(MobPtr mob) {
-    if(!mob->isAlive())
+    if (!mob->isAlive())
         return false;
     return (m_X - mob->getX()) * (m_X - mob->getX()) + (m_Y - mob->getY()) * (m_Y - mob->getY()) < (getStats()->getRange() * getStats()->getRange());
 }
@@ -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}},
 
     //-----------------------------------------------------------------
 
@@ -175,7 +175,7 @@ void ArcherTower::tick(std::uint64_t delta, World* world) {
             if (isMobInRange(mob)) {
                 world->OnArrowShot(mob, this);
                 arrowsShot++;
-                if(arrowsShot >= arrows)
+                if (arrowsShot >= arrows)
                     break;
             }
         }
@@ -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);