feat: add better mob pathing

include/game/World.h

@@ -195,6 +195,7 @@ private:
     void moveMobs(std::uint64_t delta);
     void moveMob(MobPtr mob, std::uint64_t delta);
     void moveBackMob(MobPtr mob, const TeamCastle& castle);
+    void changeMobDirection(MobPtr mob, WalkableTilePtr tile);
     bool isMobTouchingCastle(MobPtr mob, const TeamCastle& castle) const;
     void tickMobs(std::uint64_t delta);
     void cleanDeadMobs();

src/game/World.cpp

@@ -128,13 +128,84 @@ void World::tickMobs(std::uint64_t delta) {
     }
 }
 
+void World::changeMobDirection(MobPtr mob, WalkableTilePtr tile) {
+    if (mob->getDirection() == tile->direction) return;
+
+    float tileX = static_cast<float>(static_cast<std::int32_t>(mob->getCenterX()));
+    float tileY = static_cast<float>(static_cast<std::int32_t>(mob->getCenterY()));
+
+    switch (mob->getDirection()) {
+
+    case Direction::PositiveY: {
+        if (tile->direction == Direction::NegativeX) {
+            if (mob->getTileY() > mob->getTileX()) {
+                mob->setCenterY(tileY + mob->getTileX());
+                mob->setDirection(tile->direction);
+            }
+        } else { // tile->direction = Direction::PositiveX
+            if (mob->getTileY() > 1 - mob->getTileX()) {
+                mob->setCenterY(tileY + (1 - mob->getTileX()));
+                mob->setDirection(tile->direction);
+            }
+        }
+        return;
+    }
+
+    case Direction::NegativeY: {
+        if (tile->direction == Direction::PositiveX) {
+            if (mob->getTileY() < mob->getTileX()) {
+                mob->setCenterY(tileY + mob->getTileX());
+                mob->setDirection(tile->direction);
+            }
+        } else { // tile->direction = Direction::NegativeX
+            if (mob->getTileY() < 1 - mob->getTileX()) {
+                mob->setCenterY(tileY + (1 - mob->getTileX()));
+                mob->setDirection(tile->direction);
+            }
+        }
+        return;
+    }
+
+    case Direction::PositiveX: {
+        if (tile->direction == Direction::NegativeY) {
+            if (mob->getTileX() > mob->getTileY()) {
+                mob->setCenterX(tileX + mob->getTileY());
+                mob->setDirection(tile->direction);
+            }
+        } else { // tile->direction = Direction::PositiveY
+            if (mob->getTileX() > 1 - mob->getTileY()) {
+                mob->setCenterX(tileX + (1 - mob->getTileY()));
+                mob->setDirection(tile->direction);
+            }
+        }
+        return;
+    }
+
+    case Direction::NegativeX: {
+        if (tile->direction == Direction::PositiveY) {
+            if (mob->getTileX() < mob->getTileY()) {
+                mob->setCenterX(tileX + mob->getTileY());
+                mob->setDirection(tile->direction);
+            }
+        } else { // tile->direction = Direction::NegativeY
+            if (mob->getTileX() < 1 - mob->getTileY()) {
+                mob->setCenterX(tileX + (1 - mob->getTileY()));
+                mob->setDirection(tile->direction);
+            }
+        }
+        return;
+    }
+
+    }
+}
+
 void World::moveMobs(std::uint64_t delta) {
     for (MobPtr mob : m_Mobs) {
         TilePtr tile = getTile(mob->getCenter().getX(), mob->getCenter().getY());
 
         if (tile != nullptr && tile->getType() == TileType::Walk) {
-            WalkableTile* walkTile = dynamic_cast<WalkableTile*>(tile.get());
+            WalkableTilePtr walkTile = std::static_pointer_cast<WalkableTile>(tile);
-            mob->setDirection(walkTile->direction);
+            changeMobDirection(mob, walkTile);
         }
 
         if (mob->hasReachedEnemyCastle()) continue;