added the success formula, and spell deleting (shift+click)

apps/openmw/mwgui/spellwindow.cpp

@@ -2,6 +2,7 @@
 
 #include <boost/algorithm/string.hpp>
 #include <boost/lexical_cast.hpp>
+#include <boost/format.hpp>
 
 #include "../mwworld/world.hpp"
 #include "../mwworld/player.hpp"
@@ -9,10 +10,12 @@
 #include "../mwbase/environment.hpp"
 #include "../mwmechanics/spells.hpp"
 #include "../mwmechanics/creaturestats.hpp"
+#include "../mwmechanics/spellsuccess.hpp"
 #include "../mwsound/soundmanager.hpp"
 
 #include "window_manager.hpp"
 #include "inventorywindow.hpp"
+#include "confirmationdialog.hpp"
 
 namespace
 {
@@ -175,6 +178,7 @@ namespace MWGui
             t->setTextAlign(MyGUI::Align::Left);
             t->setUserString("ToolTipType", "Spell");
             t->setUserString("Spell", *it);
+            t->eventMouseWheel += MyGUI::newDelegate(this, &SpellWindow::onMouseWheel);
             t->eventMouseButtonClick += MyGUI::newDelegate(this, &SpellWindow::onSpellSelected);
 
             if (*it == selectedSpell)
@@ -194,18 +198,19 @@ namespace MWGui
             t->setTextAlign(MyGUI::Align::Left);
             t->setUserString("ToolTipType", "Spell");
             t->setUserString("Spell", *it);
+            t->eventMouseWheel += MyGUI::newDelegate(this, &SpellWindow::onMouseWheel);
             t->eventMouseButtonClick += MyGUI::newDelegate(this, &SpellWindow::onSpellSelected);
-
-            if (*it == selectedSpell)
-                t->setStateSelected(true);
+            t->setStateSelected(*it == selectedSpell);
 
             // cost / success chance
-            MyGUI::TextBox* costChance = mSpellView->createWidget<MyGUI::TextBox>("SpellText",
+            MyGUI::Button* costChance = mSpellView->createWidget<MyGUI::Button>("SpellText",
                 MyGUI::IntCoord(4, mHeight, mWidth-8, spellHeight), MyGUI::Align::Left | MyGUI::Align::Top);
             std::string cost = boost::lexical_cast<std::string>(spell->data.cost);
-            costChance->setCaption(cost + "/" + "100"); /// \todo
+            std::string chance = boost::lexical_cast<std::string>(int(MWMechanics::getSpellSuccessChance(*it, player)));
+            costChance->setCaption(cost + "/" + chance);
             costChance->setTextAlign(MyGUI::Align::Right);
             costChance->setNeedMouseFocus(false);
+            costChance->setStateSelected(*it == selectedSpell);
 
 
             mHeight += spellHeight;
@@ -219,6 +224,8 @@ namespace MWGui
         {
             MWWorld::Ptr item = *it;
 
+            const ESM::Enchantment* enchant = MWBase::Environment::get().getWorld()->getStore().enchants.find(MWWorld::Class::get(item).getEnchantment(item));
+
             // check if the item is currently equipped (will display in a different color)
             bool equipped = false;
             for (int i=0; i < MWWorld::InventoryStore::Slots; ++i)
@@ -238,18 +245,26 @@ namespace MWGui
             t->setUserString("ToolTipType", "ItemPtr");
             t->setUserString("Equipped", equipped ? "true" : "false");
             t->eventMouseButtonClick += MyGUI::newDelegate(this, &SpellWindow::onEnchantedItemSelected);
+            t->eventMouseWheel += MyGUI::newDelegate(this, &SpellWindow::onMouseWheel);
             t->setStateSelected(item == selectedItem);
 
             // cost / charge
-            MyGUI::TextBox* costCharge = mSpellView->createWidget<MyGUI::TextBox>(equipped ? "SpellText" : "SpellTextUnequipped",
+            MyGUI::Button* costCharge = mSpellView->createWidget<MyGUI::Button>(equipped ? "SpellText" : "SpellTextUnequipped",
                 MyGUI::IntCoord(4, mHeight, mWidth-8, spellHeight), MyGUI::Align::Left | MyGUI::Align::Top);
 
-            const ESM::Enchantment* enchant = MWBase::Environment::get().getWorld()->getStore().enchants.find(MWWorld::Class::get(item).getEnchantment(item));
             std::string cost = boost::lexical_cast<std::string>(enchant->data.cost);
             std::string charge = boost::lexical_cast<std::string>(enchant->data.charge); /// \todo track current charge
+            if (enchant->data.type != ESM::Enchantment::CastOnce)
+            {
+                // this is Morrowind behaviour
+                cost = "100";
+                charge = "100";
+            }
+
             costCharge->setCaption(cost + "/" + charge);
             costCharge->setTextAlign(MyGUI::Align::Right);
             costCharge->setNeedMouseFocus(false);
+            costCharge->setStateSelected(item == selectedItem);
 
             mHeight += spellHeight;
         }
@@ -312,8 +327,9 @@ namespace MWGui
         }
         assert(it != store.end());
 
-        // equip, if it is not already equipped
-        if (_sender->getUserString("Equipped") == "false")
+        // equip, if it can be equipped and is not already equipped
+        if (_sender->getUserString("Equipped") == "false"
+            && !MWWorld::Class::get(item).getEquipmentSlots(item).first.empty())
         {
             // sound
             MWBase::Environment::get().getSoundManager()->playSound(MWWorld::Class::get(item).getUpSoundId(item), 1.0, 1.0);
@@ -324,7 +340,6 @@ namespace MWGui
             // slots that this item can be equipped in
             std::pair<std::vector<int>, bool> slots = MWWorld::Class::get(item).getEquipmentSlots(item);
 
-
             // equip the item in the first free slot
             for (std::vector<int>::const_iterator slot=slots.first.begin();
                 slot!=slots.first.end(); ++slot)
@@ -362,8 +377,33 @@ namespace MWGui
         MWWorld::InventoryStore& store = MWWorld::Class::get(player).getInventoryStore(player);
         MWMechanics::Spells& spells = stats.mSpells;
 
-        spells.setSelectedSpell(_sender->getUserString("Spell"));
-        store.setSelectedEnchantItem(store.end());
+        if (MyGUI::InputManager::getInstance().isShiftPressed())
+        {
+            // delete spell, if allowed
+            const ESM::Spell* spell = MWBase::Environment::get().getWorld()->getStore().spells.find(_sender->getUserString("Spell"));
+            if (spell->data.flags & ESM::Spell::F_Always
+                || spell->data.type == ESM::Spell::ST_Power)
+            {
+                mWindowManager.messageBox("#{sDeleteSpellError}", std::vector<std::string>());
+            }
+            else
+            {
+                // ask for confirmation
+                mSpellToDelete = _sender->getUserString("Spell");
+                ConfirmationDialog* dialog = mWindowManager.getConfirmationDialog();
+                std::string question = mWindowManager.getGameSettingString("sQuestionDeleteSpell", "Delete %s?");
+                question = boost::str(boost::format(question) % spell->name);
+                dialog->open(question);
+                dialog->eventOkClicked.clear();
+                dialog->eventOkClicked += MyGUI::newDelegate(this, &SpellWindow::onDeleteSpellAccept);
+                dialog->eventCancelClicked.clear();
+            }
+        }
+        else
+        {
+            spells.setSelectedSpell(_sender->getUserString("Spell"));
+            store.setSelectedEnchantItem(store.end());
+        }
 
         updateSpells();
     }
@@ -375,4 +415,23 @@ namespace MWGui
         height += numSpells * 18;
         return height;
     }
+
+    void SpellWindow::onMouseWheel(MyGUI::Widget* _sender, int _rel)
+    {
+        if (mSpellView->getViewOffset().top + _rel*0.3 > 0)
+            mSpellView->setViewOffset(MyGUI::IntPoint(0, 0));
+        else
+            mSpellView->setViewOffset(MyGUI::IntPoint(0, mSpellView->getViewOffset().top + _rel*0.3));
+    }
+
+    void SpellWindow::onDeleteSpellAccept()
+    {
+        MWWorld::Ptr player = MWBase::Environment::get().getWorld()->getPlayer().getPlayer();
+        MWMechanics::CreatureStats& stats = MWWorld::Class::get(player).getCreatureStats(player);
+        MWMechanics::Spells& spells = stats.mSpells;
+
+        spells.remove(mSpellToDelete);
+
+        updateSpells();
+    }
 }

apps/openmw/mwgui/spellwindow.hpp

@@ -19,14 +19,19 @@ namespace MWGui
         int mHeight;
         int mWidth;
 
+        std::string mSpellToDelete;
+
         void addGroup(const std::string& label, const std::string& label2);
 
         int estimateHeight(int numSpells) const;
 
-        virtual void onPinToggled();
         void onWindowResize(MyGUI::Window* _sender);
         void onEnchantedItemSelected(MyGUI::Widget* _sender);
         void onSpellSelected(MyGUI::Widget* _sender);
+        void onMouseWheel(MyGUI::Widget* _sender, int _rel);
+        void onDeleteSpellAccept();
+
+        virtual void onPinToggled();
         virtual void open();
     };
 }

apps/openmw/mwmechanics/spellsuccess.hpp

@@ -0,0 +1,83 @@
+#ifndef MWMECHANICS_SPELLSUCCESS_H
+#define MWMECHANICS_SPELLSUCCESS_H
+
+#include "../mwworld/ptr.hpp"
+#include "../mwworld/world.hpp"
+#include "../mwbase/environment.hpp"
+
+#include "npcstats.hpp"
+
+namespace MWMechanics
+{
+    // UESP wiki / Morrowind/Spells:
+    // Chance of success is (Spell's skill * 2 + Willpower / 5 + Luck / 10 - Spell cost - Sound magnitude) * (Current fatigue + Maximum Fatigue * 1.5) / Maximum fatigue * 2
+
+    /**
+     * @param spellId ID of spell
+     * @param actor calculate spell success chance for this actor (depends on actor's skills)
+     * @attention actor has to be an NPC and not a creature!
+     * @return success chance from 0 to 100 (in percent)
+     */
+    float getSpellSuccessChance (const std::string& spellId, const MWWorld::Ptr& actor)
+    {
+        const ESM::Spell* spell = MWBase::Environment::get().getWorld()->getStore().spells.find(spellId);
+
+        if (spell->data.flags & ESM::Spell::F_Always) // spells with this flag always succeed (usually birthsign spells)
+            return 100.0;
+
+        NpcStats& stats = MWWorld::Class::get(actor).getNpcStats(actor);
+        CreatureStats& creatureStats = MWWorld::Class::get(actor).getCreatureStats(actor);
+
+        std::map<int, int> schoolSkillMap; // maps spell school to skill id
+        schoolSkillMap[0] = 11; // alteration
+        schoolSkillMap[1] = 13; // conjuration
+        schoolSkillMap[3] = 12; // illusion
+        schoolSkillMap[2] = 10; // destruction
+        schoolSkillMap[4] = 14; // mysticism
+        schoolSkillMap[5] = 15; // restoration
+
+        // determine the spell's school
+        // this is always the school where the player's respective skill is the least advanced
+        // out of all the magic effects' schools
+        const std::vector<ESM::ENAMstruct>& effects = spell->effects.list;
+        int skill = -1;
+        int skillLevel = -1;
+        for (std::vector<ESM::ENAMstruct>::const_iterator it = effects.begin();
+            it != effects.end(); ++it)
+        {
+            const ESM::MagicEffect* effect = MWBase::Environment::get().getWorld()->getStore().magicEffects.find(it->effectID);
+            int school = effect->data.school;
+            assert(schoolSkillMap.find(school) != schoolSkillMap.end());
+            int _skillLevel = stats.mSkill[schoolSkillMap[school]].getModified();
+
+            if (skill == -1)
+            {
+                skill = schoolSkillMap[school];
+                skillLevel = _skillLevel;
+            }
+            else if (_skillLevel < skillLevel)
+            {
+                skill = schoolSkillMap[school];
+                skillLevel = _skillLevel;
+            }
+        }
+
+        // Sound magic effect (reduces spell casting chance)
+        int soundMagnitude = creatureStats.mMagicEffects.get (MWMechanics::EffectKey (48)).mMagnitude;
+
+        int willpower = creatureStats.mAttributes[ESM::Attribute::Willpower].getModified();
+        int luck = creatureStats.mAttributes[ESM::Attribute::Luck].getModified();
+        int currentFatigue = creatureStats.mDynamic[2].getCurrent();
+        int maxFatigue = creatureStats.mDynamic[2].getModified();
+        int spellCost = spell->data.cost;
+
+        // There we go, all needed variables are there, lets go
+        float chance = (float(skillLevel * 2) + float(willpower)/5.0 + float(luck)/ 10.0 - spellCost - soundMagnitude) * (float(currentFatigue + maxFatigue * 1.5)) / float(maxFatigue * 2.0);
+
+        chance = std::max(0.0f, std::min(100.0f, chance)); // clamp to 0 .. 100
+
+        return chance;
+    }
+}
+
+#endif