Merge pull request #1647 from Capostrophic/fatigue

Improve the logic of trading formulae (bug #2222)

CHANGELOG.md

@@ -2,6 +2,7 @@
 ------
 
     Bug #1990: Sunrise/sunset not set correct
+    Bug #2222: Fatigue's effect on selling price is backwards
     Bug #2326: After a bound item expires the last equipped item of that type is not automatically re-equipped
     Bug #2835: Player able to slowly move when overencumbered
     Bug #3374: Touch spells not hitting kwama foragers

apps/openmw/mwmechanics/mechanicsmanagerimp.cpp

@@ -630,22 +630,12 @@ namespace MWMechanics
         float d = static_cast<float>(std::min(sellerStats.getSkill(ESM::Skill::Mercantile).getModified(), 100));
         float e = std::min(0.1f * sellerStats.getAttribute(ESM::Attribute::Luck).getModified(), 10.f);
         float f = std::min(0.2f * sellerStats.getAttribute(ESM::Attribute::Personality).getModified(), 10.f);
-
         float pcTerm = (clampedDisposition - 50 + a + b + c) * playerStats.getFatigueTerm();
         float npcTerm = (d + e + f) * sellerStats.getFatigueTerm();
-        float buyTerm = 0.01f * (100 - 0.5f * (pcTerm - npcTerm));
-        float sellTerm = 0.01f * (50 - 0.5f * (npcTerm - pcTerm));
-
-        float x;
-        if(buying) x = buyTerm;
-        else x = std::min(buyTerm, sellTerm);
-        int offerPrice;
-        if (x < 1)
-            offerPrice = int(x * basePrice);
-        else
-            offerPrice = basePrice + int((x - 1) * basePrice);
-        offerPrice = std::max(1, offerPrice);
-        return offerPrice;
+        float buyTerm = 0.01f * std::max(75.f, (100 - 0.5f * (pcTerm - npcTerm)));
+        float sellTerm = 0.01f * std::min(75.f, (50 - 0.5f * (npcTerm - pcTerm)));
+        int offerPrice = int(basePrice * (buying ? buyTerm : sellTerm));
+        return std::max(1, offerPrice);
     }
 
     int MechanicsManager::countDeaths (const std::string& id) const

apps/openmw/mwmechanics/trading.cpp

@@ -32,7 +32,6 @@ namespace MWMechanics
 
         // Is the player buying?
         bool buying = (merchantOffer < 0);
-
         int a = std::abs(merchantOffer);
         int b = std::abs(playerOffer);
         int d = (buying)
@@ -56,7 +55,7 @@ namespace MWMechanics
         float npcTerm = (d1 + e1 + f1) * merchantStats.getFatigueTerm();
         float x = gmst.find("fBargainOfferMulti")->getFloat() * d
             + gmst.find("fBargainOfferBase")->getFloat()
-            + std::abs(int(pcTerm - npcTerm));
+            + int(pcTerm - npcTerm);
 
         int roll = Misc::Rng::rollDice(100) + 1;