Working on viewing distance for enemies

src/CharacterState.h

@@ -10,6 +10,8 @@
 
 namespace ZL {
 
+    constexpr float VISIBLE_RANGE = 6.f;
+
 enum class AnimationState {
     STAND = 0,
     WALK = 1,
@@ -70,6 +72,8 @@ public:
     float hp        = 200.f;
     float initialHp = 200.f;
 
+    float visibleRange = VISIBLE_RANGE;
+
     // --- Combat flags ---
     int            battle_state    = 0;
     bool           resetAnim       = false;