src/battle/BattleState.cpp

   1 #include "BattleState.h"
   2
   3 #include "PartyLayout.h"
   4 #include "states/SelectMoveAction.h"
   5 #include "states/PerformAttacks.h"
   6 #include "../app/Application.h"
   7 #include "../app/Input.h"
   8 #include "../common/GameState.h"
   9 #include "../common/Ikari.h"
  10 #include "../common/Inventory.h"
  11 #include "../common/Item.h"
  12 #include "../common/Spell.h"
  13 #include "../graphics/Frame.h"
  14 #include "../graphics/Sprite.h"
  15
  16 #include <algorithm>
  17 #include <cassert>
  18 #include <cstdlib>
  19 #include <stdexcept>
  20
  21 using app::Application;
  22 using app::Input;
  23 using common::Inventory;
  24 using common::Item;
  25 using common::Spell;
  26 using common::Stats;
  27 using geometry::Vector;
  28 using graphics::Menu;
  29
  30 using std::rand;
  31 using std::vector;
  32
  33 namespace battle {
  34
  35 void BattleState::AddMonster(const Monster &m) {
  36         if (monsters.size() >= monstersLayout->NumPositions()) {
  37                 throw std::overflow_error("too many monsters for layout");
  38         }
  39         monsters.push_back(m);
  40 }
  41
  42 void BattleState::AddHero(const Hero &h) {
  43         if (numHeroes >= 4 || numHeroes >= (int)heroesLayout->NumPositions()) {
  44                 throw std::overflow_error("too many heroes for layout");
  45         }
  46         heroes[numHeroes] = h;
  47         ++numHeroes;
  48 }
  49
  50 void BattleState::NextHero() {
  51         ++activeHero;
  52         while (activeHero < numHeroes && heroes[activeHero].Health() == 0) {
  53                 ++activeHero;
  54         }
  55 }
  56
  57 void BattleState::PreviousHero() {
  58         --activeHero;
  59         while (activeHero >= 0 && heroes[activeHero].Health() == 0) {
  60                 --activeHero;
  61         }
  62 }
  63
  64 void BattleState::SwapHeroes(int lhs, int rhs) {
  65         if (lhs < 0 || lhs >= numHeroes || rhs < 0 || rhs >= numHeroes || lhs == rhs) return;
  66         std::swap(heroes[lhs], heroes[rhs]);
  67 }
  68
  69
  70 void BattleState::OnResize(int w, int h) {
  71
  72 }
  73
  74
  75 void BattleState::OnEnterState(SDL_Surface *screen) {
  76         for (int i(0); i < 4; ++i) {
  77                 heroes[i].Position() = heroesLayout->CalculatePosition(i, background->w, background->h);
  78                 heroes[i].SpellMenu() = *res->spellMenuProperties;
  79                 heroes[i].UpdateSpellMenu();
  80                 heroes[i].IkariMenu() = *res->ikariMenuProperties;
  81                 heroes[i].UpdateIkariMenu(res);
  82                 heroTags[i] = HeroTag(this, i);
  83                 smallHeroTags[i] = SmallHeroTag(this, i);
  84         }
  85
  86         for (int i(0); i < int(monsters.size()); ++i) {
  87                 monsters[i].Position() = monstersLayout->CalculatePosition(i, background->w, background->h);
  88         }
  89
  90         int tagHeight(attackTypeMenu.Height());
  91         int tagWidth(attackTypeMenu.Width() * 2 + attackTypeMenu.Width() / 2);
  92         int xOffset((Width() - 2 * tagWidth) / 2);
  93         heroTagPositions[0] = Vector<int>(xOffset, Height() - 2 * tagHeight);
  94         heroTagPositions[1] = Vector<int>(xOffset + tagWidth, Height() - 2 * tagHeight);
  95         heroTagPositions[2] = Vector<int>(xOffset, Height() - tagHeight);
  96         heroTagPositions[3] = Vector<int>(xOffset + tagWidth, Height() - tagHeight);
  97
  98         tagHeight = res->normalFont->CharHeight() * 4 + res->smallHeroTagFrame->BorderHeight() * 2;
  99         tagWidth = res->normalFont->CharWidth() * 6 + res->smallHeroTagFrame->BorderWidth() * 2;
 100         xOffset = (Width() - 4 * tagWidth) / 2;
 101         int yOffset(Height() - tagHeight);
 102         smallHeroTagPositions[0] = Vector<int>(xOffset, yOffset);
 103         smallHeroTagPositions[1] = Vector<int>(xOffset + 2 * tagWidth, yOffset);
 104         smallHeroTagPositions[2] = Vector<int>(xOffset + tagWidth, yOffset);
 105         smallHeroTagPositions[3] = Vector<int>(xOffset + 3 * tagWidth, yOffset);
 106
 107         itemMenu = *res->itemMenuProperties;
 108         LoadInventory();
 109         ClearAllAttacks();
 110 }
 111
 112 void BattleState::LoadInventory() {
 113         const Inventory &inv(game->state->inventory);
 114         itemMenu.Clear();
 115         itemMenu.Reserve(inv.MaxItems());
 116         for (int i(0); i < inv.MaxItems(); ++i) {
 117                 const Item *item(inv.ItemAt(i));
 118                 if (item) {
 119                         itemMenu.Add(item->Name(), item, item->CanUseInBattle(), item->MenuIcon(), inv.ItemCountAt(i));
 120                 } else {
 121                         itemMenu.AddEmptyEntry();
 122                 }
 123         }
 124 }
 125
 126 void BattleState::OnExitState(SDL_Surface *screen) {
 127
 128 }
 129
 130 void BattleState::OnResumeState(SDL_Surface *screen) {
 131         if (ranAway) {
 132                 Ctrl().PopState(); // quit the battle scene
 133                 return;
 134         }
 135         if (Victory()) {
 136                 Ctrl().PopState();
 137                 return;
 138         }
 139         if (Defeat()) {
 140                 Ctrl().PopState();
 141                 return;
 142         }
 143         // TODO: this should not push a state while quitting
 144         if (AttackSelectionDone()) {
 145                 Ctrl().PushState(new PerformAttacks(this));
 146         } else {
 147                 Ctrl().PushState(new SelectMoveAction(this));
 148         }
 149 }
 150
 151 bool BattleState::Victory() const {
 152         for (int i(0); i < MaxMonsters(); ++i) {
 153                 if (MonsterAt(i).Health() > 0) return false;
 154         }
 155         return true;
 156 }
 157
 158 bool BattleState::Defeat() const {
 159         for (int i(0); i < NumHeroes(); ++i) {
 160                 if (HeroAt(i).Health() > 0) return false;
 161         }
 162         return true;
 163 }
 164
 165 void BattleState::OnPauseState(SDL_Surface *screen) {
 166
 167 }
 168
 169
 170 class OrderCompare {
 171         public:
 172                 OrderCompare(BattleState *battle) : battle(battle) { }
 173                 bool operator ()(const BattleState::Order &lhs, const BattleState::Order &rhs) {
 174                         int lagl(lhs.isMonster ? battle->MonsterAt(lhs.index).GetStats().Agility() : battle->HeroAt(lhs.index).GetStats().Agility());
 175                         int ragl(rhs.isMonster ? battle->MonsterAt(rhs.index).GetStats().Agility() : battle->HeroAt(rhs.index).GetStats().Agility());
 176                         return lagl > ragl;
 177                 }
 178         private:
 179                 BattleState *battle;
 180 };
 181
 182 void BattleState::CalculateAttackOrder() {
 183         attackOrder.reserve(monsters.size() + NumHeroes());
 184         for (int i(0); i < NumHeroes(); ++i) {
 185                 attackOrder.push_back(Order(i, false));
 186         }
 187         for (vector<Monster>::size_type i(0), end(monsters.size()); i < end; ++i) {
 188                 attackOrder.push_back(Order(i, true));
 189                 MonsterAt(i).GetAttackChoice() = AttackChoice(this);
 190         }
 191         std::sort(attackOrder.begin(), attackOrder.end(), OrderCompare(this));
 192 }
 193
 194 void BattleState::NextAttack() {
 195         if (Victory() || Defeat()) {
 196                 attackCursor = attackOrder.size();
 197                 return;
 198         }
 199         ++attackCursor;
 200         while (attackCursor < int(attackOrder.size())) {
 201                 if (attackOrder[attackCursor].isMonster) {
 202                         if (MonsterAt(attackOrder[attackCursor].index).Health() > 0) break;
 203                 } else {
 204                         if (HeroAt(attackOrder[attackCursor].index).Health() > 0) break;
 205                 }
 206                 ++attackCursor;
 207         }
 208 }
 209
 210 bool BattleState::AttacksFinished() const {
 211         return attackCursor >= int(attackOrder.size())
 212                         || Victory() || Defeat();
 213 }
 214
 215 void BattleState::CalculateDamage() {
 216         if (CurrentAttack().isMonster) {
 217                 DecideMonsterAttack(MonsterAt(CurrentAttack().index));
 218         }
 219         AttackChoice &ac(CurrentAttack().isMonster ? MonsterAt(CurrentAttack().index).GetAttackChoice() : HeroAt(CurrentAttack().index).GetAttackChoice());
 220         if (ac.GetType() == AttackChoice::DEFEND) return;
 221         TargetSelection &ts(ac.Selection());
 222
 223         if (CurrentAttack().isMonster) {
 224                 const Stats &attackerStats(MonsterAt(CurrentAttack().index).GetStats());
 225                 CalculateDamage(attackerStats, ts);
 226         } else {
 227                 const Stats &attackerStats(HeroAt(CurrentAttack().index).GetStats());
 228                 CalculateDamage(attackerStats, ts);
 229         }
 230 }
 231
 232 void BattleState::DecideMonsterAttack(Monster &m) const {
 233         AttackChoice &ac(m.GetAttackChoice());
 234         TargetSelection &ts(ac.Selection());
 235         ac.Reset();
 236         int target(rand() % NumHeroes());
 237         while (!HeroPositionOccupied(target)) {
 238                 target = rand() % NumHeroes();
 239         }
 240         ac.SetType(AttackChoice::SWORD);
 241         ts.SelectHeroes();
 242         ts.SetSingle();
 243         ts.Select(target);
 244 }
 245
 246 void BattleState::CalculateDamage(const Stats &attackerStats, TargetSelection &ts) const {
 247         bool hitSome(false);
 248         if (ts.TargetsMonsters()) {
 249                 for (int i(0); i < MaxMonsters(); ++i) {
 250                         if (ts.IsSelected(i)) {
 251                                 if (MonsterAt(i).Health() > 0) {
 252                                         const Stats &defenderStats(MonsterAt(i).GetStats());
 253                                         Uint16 damage(CalculateDamage(attackerStats, defenderStats));
 254                                         ts.SetBad(i, damage);
 255                                         hitSome = true;
 256                                 } else {
 257                                         ts.Unselect(i);
 258                                 }
 259                         }
 260                 }
 261                 if (hitSome) return;
 262                 for (int i(0); i < MaxMonsters(); ++i) {
 263                         if (MonsterAt(i).Health() > 0) {
 264                                 const Stats &defenderStats(MonsterAt(i).GetStats());
 265                                 Uint16 damage(CalculateDamage(attackerStats, defenderStats));
 266                                 ts.SetBad(i, damage);
 267                                 break;
 268                         }
 269                 }
 270         } else {
 271                 for (int i(0); i < NumHeroes(); ++i) {
 272                         if (ts.IsSelected(i)) {
 273                                 if (HeroAt(i).Health() > 0) {
 274                                         const Stats &defenderStats(HeroAt(i).GetStats());
 275                                         Uint16 damage(CalculateDamage(attackerStats, defenderStats));
 276                                         ts.SetBad(i, damage);
 277                                         hitSome = true;
 278                                 } else {
 279                                         ts.Unselect(i);
 280                                 }
 281                         }
 282                 }
 283                 if (hitSome) return;
 284                 for (int i(0); i < NumHeroes(); ++i) {
 285                         if (HeroAt(i).Health() > 0) {
 286                                 const Stats &defenderStats(HeroAt(i).GetStats());
 287                                 Uint16 damage(CalculateDamage(attackerStats, defenderStats));
 288                                 ts.SetBad(i, damage);
 289                                 break;
 290                         }
 291                 }
 292         }
 293 }
 294
 295 Uint16 BattleState::CalculateDamage(const Stats &attacker, const Stats &defender) const {
 296         return attacker.Attack() / 2 - defender.Defense() / 4;
 297 }
 298
 299 void BattleState::ApplyDamage() {
 300         if (attackCursor < 0) return;
 301         AttackChoice &ac(CurrentAttack().isMonster ? MonsterAt(CurrentAttack().index).GetAttackChoice() : HeroAt(CurrentAttack().index).GetAttackChoice());
 302         TargetSelection &ts(ac.Selection());
 303         if (ts.TargetsMonsters()) {
 304                 for (int i(0); i < MaxMonsters(); ++i) {
 305                         Monster &monster(MonsterAt(i));
 306                         if (ts.IsBad(i)) {
 307                                 monster.SubtractHealth(ts.GetAmount(i));
 308                                 if (monster.Health() == 0) {
 309                                         expReward += monster.ExpReward();
 310                                         goldReward += monster.GoldReward();
 311                                 }
 312                         }
 313                 }
 314         } else {
 315                 for (int i(0); i < NumHeroes(); ++i) {
 316                         Hero &hero(HeroAt(i));
 317                         if (ts.IsBad(i)) {
 318                                 hero.SubtractHealth(ts.GetAmount(i));
 319                         }
 320                 }
 321         }
 322 }
 323
 324 AttackChoice &BattleState::CurrentAttackAttackChoice() {
 325         if (CurrentAttack().isMonster) {
 326                 return MonsterAt(CurrentAttack().index).GetAttackChoice();
 327         } else {
 328                 return HeroAt(CurrentAttack().index).GetAttackChoice();
 329         }
 330 }
 331
 332 void BattleState::ClearAllAttacks() {
 333         attackCursor = -1;
 334         activeHero = -1;
 335         for (int i(0); i < NumHeroes(); ++i) {
 336                 HeroAt(i).GetAttackChoice() = AttackChoice(this);
 337         }
 338         for (int i(0); i < MaxMonsters(); ++i) {
 339                 MonsterAt(i).GetAttackChoice() = AttackChoice(this);
 340         }
 341         attackOrder.clear();
 342 }
 343
 344
 345 void BattleState::HandleEvents(const Input &input) {
 346
 347 }
 348
 349 void BattleState::UpdateWorld(float deltaT) {
 350
 351 }
 352
 353 void BattleState::Render(SDL_Surface *screen) {
 354         assert(screen);
 355         Vector<int> offset(CalculateScreenOffset(screen));
 356         RenderBackground(screen, offset);
 357         RenderMonsters(screen, offset);
 358 }
 359
 360 void BattleState::RenderBackground(SDL_Surface *screen, const Vector<int> &offset) {
 361         assert(screen);
 362         // black for now
 363         SDL_FillRect(screen, 0, SDL_MapRGB(screen->format, 0, 0, 0));
 364         SDL_Rect destRect;
 365         destRect.x = offset.X();
 366         destRect.y = offset.Y();
 367         destRect.w = background->w;
 368         destRect.h = background->h;
 369         SDL_BlitSurface(background, 0, screen, &destRect);
 370 }
 371
 372 void BattleState::RenderMonsters(SDL_Surface *screen, const Vector<int> &offset) {
 373         assert(screen);
 374         for (vector<Monster>::size_type i(0), end(monsters.size()); i < end; ++i) {
 375                 if (MonsterPositionOccupied(i)) {
 376                         if (monsters[i].GetAnimation().Running()) {
 377                                 monsters[i].GetAnimation().DrawCenter(screen, monsters[i].Position() + offset);
 378                         } else {
 379                                 monsters[i].Sprite()->DrawCenter(screen, monsters[i].Position() + offset);
 380                         }
 381                 }
 382         }
 383 }
 384
 385 void BattleState::RenderHeroes(SDL_Surface *screen, const Vector<int> &offset) {
 386         assert(screen);
 387         for (int i(0); i < numHeroes; ++i) {
 388                 if (heroes[i].GetAnimation().Running()) {
 389                         heroes[i].GetAnimation().DrawCenter(screen, heroes[i].Position() + offset);
 390                 } else {
 391                         int row(heroes[i].Health() > 0 ? 0 : 2);
 392                         heroes[i].Sprite()->DrawCenter(screen, heroes[i].Position() + offset, 1, row);
 393                 }
 394         }
 395 }
 396
 397 void BattleState::RenderHeroTags(SDL_Surface *screen, const Vector<int> &offset) {
 398         assert(screen);
 399         int tagHeight(attackTypeMenu.Height());
 400         int tagWidth(attackTypeMenu.Width() * 2 + attackTypeMenu.Width() / 2);
 401
 402         for (int i(0); i < numHeroes; ++i) {
 403                 heroTags[i].Render(screen, tagWidth, tagHeight, heroTagPositions[i] + offset, (int)i == activeHero);
 404         }
 405 }
 406
 407 void BattleState::RenderSmallHeroTags(SDL_Surface *screen, const Vector<int> &offset) {
 408         assert(screen);
 409         int tagHeight(res->normalFont->CharHeight() * 4 + res->smallHeroTagFrame->BorderHeight() * 2);
 410         int tagWidth(res->normalFont->CharWidth() * 6 + res->smallHeroTagFrame->BorderWidth() * 2);
 411
 412         SDL_Rect rect;
 413         rect.x = offset.X();
 414         rect.y = offset.Y() + Height() - tagHeight;
 415         rect.w = Width();
 416         rect.h = tagHeight;
 417         SDL_FillRect(screen, &rect, SDL_MapRGB(screen->format, 0, 0, 0));
 418         rect.y += res->normalFont->CharHeight() / 8;
 419         rect.h -= res->normalFont->CharHeight() / 4;
 420         SDL_FillRect(screen, &rect, res->heroesBgColor.MapRGB(screen->format));
 421
 422         for (int i(0); i < numHeroes; ++i) {
 423                 smallHeroTags[i].Render(screen, tagWidth, tagHeight, smallHeroTagPositions[i] + offset);
 424         }
 425 }
 426
 427 }