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::SetCapsule(const Capsule &c) {
  51         capsule = c;
  52 }
  53
  54 void BattleState::NextHero() {
  55         ++activeHero;
  56         while (activeHero < numHeroes && heroes[activeHero].Health() == 0) {
  57                 ++activeHero;
  58         }
  59 }
  60
  61 void BattleState::PreviousHero() {
  62         --activeHero;
  63         while (activeHero >= 0 && heroes[activeHero].Health() == 0) {
  64                 --activeHero;
  65         }
  66 }
  67
  68 void BattleState::SwapHeroes(int lhs, int rhs) {
  69         if (lhs < 0 || lhs >= numHeroes || rhs < 0 || rhs >= numHeroes || lhs == rhs) return;
  70         std::swap(heroes[lhs], heroes[rhs]);
  71 }
  72
  73
  74 void BattleState::OnResize(int w, int h) {
  75
  76 }
  77
  78
  79 void BattleState::OnEnterState(SDL_Surface *screen) {
  80         for (int i(0); i < 4; ++i) {
  81                 heroes[i].Position() = heroesLayout->CalculatePosition(i, background->w, background->h);
  82                 heroes[i].SpellMenu() = *res->spellMenuProperties;
  83                 heroes[i].UpdateSpellMenu();
  84                 heroes[i].IkariMenu() = *res->ikariMenuProperties;
  85                 heroes[i].UpdateIkariMenu(res);
  86                 heroTags[i] = HeroTag(this, i);
  87                 smallHeroTags[i] = SmallHeroTag(this, i);
  88         }
  89
  90         capsule.Position() = heroesLayout->CalculatePosition(4, background->w, background->h);
  91
  92         for (int i(0); i < int(monsters.size()); ++i) {
  93                 monsters[i].Position() = monstersLayout->CalculatePosition(i, background->w, background->h);
  94         }
  95
  96         int tagHeight(attackTypeMenu.Height());
  97         int tagWidth(attackTypeMenu.Width() * 2 + attackTypeMenu.Width() / 2);
  98         int xOffset((Width() - 2 * tagWidth) / 2);
  99         heroTagPositions[0] = Vector<int>(xOffset, Height() - 2 * tagHeight);
 100         heroTagPositions[1] = Vector<int>(xOffset + tagWidth, Height() - 2 * tagHeight);
 101         heroTagPositions[2] = Vector<int>(xOffset, Height() - tagHeight);
 102         heroTagPositions[3] = Vector<int>(xOffset + tagWidth, Height() - tagHeight);
 103
 104         tagHeight = res->normalFont->CharHeight() * 4 + res->smallHeroTagFrame->BorderHeight() * 2;
 105         tagWidth = res->normalFont->CharWidth() * 6 + res->smallHeroTagFrame->BorderWidth() * 2;
 106         xOffset = (Width() - 4 * tagWidth) / 2;
 107         int yOffset(Height() - tagHeight);
 108         smallHeroTagPositions[0] = Vector<int>(xOffset, yOffset);
 109         smallHeroTagPositions[1] = Vector<int>(xOffset + 2 * tagWidth, yOffset);
 110         smallHeroTagPositions[2] = Vector<int>(xOffset + tagWidth, yOffset);
 111         smallHeroTagPositions[3] = Vector<int>(xOffset + 3 * tagWidth, yOffset);
 112
 113         itemMenu = *res->itemMenuProperties;
 114         LoadInventory();
 115         ClearAllAttacks();
 116 }
 117
 118 void BattleState::LoadInventory() {
 119         const Inventory &inv(game->state->inventory);
 120         itemMenu.Clear();
 121         itemMenu.Reserve(inv.MaxItems());
 122         for (int i(0); i < inv.MaxItems(); ++i) {
 123                 const Item *item(inv.ItemAt(i));
 124                 if (item) {
 125                         itemMenu.Add(item->Name(), item, item->CanUseInBattle(), item->MenuIcon(), inv.ItemCountAt(i));
 126                 } else {
 127                         itemMenu.AddEmptyEntry();
 128                 }
 129         }
 130 }
 131
 132 void BattleState::OnExitState(SDL_Surface *screen) {
 133
 134 }
 135
 136 void BattleState::OnResumeState(SDL_Surface *screen) {
 137         if (ranAway) {
 138                 Ctrl().PopState(); // quit the battle scene
 139                 return;
 140         }
 141         if (Victory()) {
 142                 Ctrl().PopState();
 143                 return;
 144         }
 145         if (Defeat()) {
 146                 Ctrl().PopState();
 147                 return;
 148         }
 149         // TODO: this should not push a state while quitting
 150         if (AttackSelectionDone()) {
 151                 Ctrl().PushState(new PerformAttacks(this));
 152         } else {
 153                 Ctrl().PushState(new SelectMoveAction(this));
 154         }
 155 }
 156
 157 bool BattleState::Victory() const {
 158         for (int i(0); i < MaxMonsters(); ++i) {
 159                 if (MonsterAt(i).Health() > 0) return false;
 160         }
 161         return true;
 162 }
 163
 164 bool BattleState::Defeat() const {
 165         for (int i(0); i < NumHeroes(); ++i) {
 166                 if (HeroAt(i).Health() > 0) return false;
 167         }
 168         return true;
 169 }
 170
 171 void BattleState::OnPauseState(SDL_Surface *screen) {
 172
 173 }
 174
 175
 176 class OrderCompare {
 177         public:
 178                 OrderCompare(BattleState *battle) : battle(battle) { }
 179                 bool operator ()(const BattleState::Order &lhs, const BattleState::Order &rhs) {
 180                         return lhs.GetStats(*battle).Agility() > rhs.GetStats(*battle).Agility();
 181                 }
 182         private:
 183                 BattleState *battle;
 184 };
 185
 186 void BattleState::CalculateAttackOrder() {
 187         attackOrder.reserve(monsters.size() + NumHeroes());
 188         for (int i(0); i < NumHeroes(); ++i) {
 189                 attackOrder.push_back(Order(Order::HERO, i));
 190         }
 191         for (vector<Monster>::size_type i(0), end(monsters.size()); i < end; ++i) {
 192                 attackOrder.push_back(Order(Order::MONSTER, i));
 193                 MonsterAt(i).GetAttackChoice() = AttackChoice(this);
 194         }
 195         if (capsule.Health() > 0) {
 196                 attackOrder.push_back(Order(Order::CAPSULE));
 197         }
 198         std::sort(attackOrder.begin(), attackOrder.end(), OrderCompare(this));
 199 }
 200
 201 void BattleState::NextAttack() {
 202         if (Victory() || Defeat()) {
 203                 attackCursor = attackOrder.size();
 204                 return;
 205         }
 206         ++attackCursor;
 207         while (attackCursor < int(attackOrder.size())) {
 208                 if (attackOrder[attackCursor].IsMonster()) {
 209                         if (MonsterAt(attackOrder[attackCursor].index).Health() > 0) break;
 210                 } else if (attackOrder[attackCursor].IsHero()) {
 211                         if (HeroAt(attackOrder[attackCursor].index).Health() > 0) break;
 212                 } else {
 213                         if (capsule.Health() > 0) break;
 214                 }
 215                 ++attackCursor;
 216         }
 217 }
 218
 219 bool BattleState::AttacksFinished() const {
 220         return attackCursor >= int(attackOrder.size())
 221                         || Victory() || Defeat();
 222 }
 223
 224 void BattleState::CalculateDamage() {
 225         if (CurrentAttack().IsMonster()) {
 226                 DecideMonsterAttack(MonsterAt(CurrentAttack().index));
 227         } else if (CurrentAttack().IsCapsule()) {
 228                 DecideCapsuleAttack();
 229         }
 230         AttackChoice &ac = CurrentAttack().GetAttackChoice(*this);
 231         if (ac.GetType() == AttackChoice::DEFEND) return;
 232         TargetSelection &ts(ac.Selection());
 233
 234         const Stats &attackerStats = CurrentAttack().GetStats(*this);
 235         CalculateDamage(attackerStats, ts);
 236 }
 237
 238 void BattleState::DecideMonsterAttack(Monster &m) {
 239         AttackChoice &ac(m.GetAttackChoice());
 240         TargetSelection &ts(ac.Selection());
 241         ac.Reset();
 242         int target(rand() % NumHeroes());
 243         while (!HeroPositionOccupied(target)) {
 244                 target = rand() % NumHeroes();
 245         }
 246         ac.SetType(AttackChoice::SWORD);
 247         ts.SelectHeroes();
 248         ts.SetSingle();
 249         ts.Select(target);
 250 }
 251
 252 void BattleState::DecideCapsuleAttack() {
 253         AttackChoice &ac(capsule.GetAttackChoice());
 254         TargetSelection &ts(ac.Selection());
 255         ac.Reset();
 256         int target(rand() % monsters.size());
 257         while (!MonsterPositionOccupied(target)) {
 258                 target = rand() % monsters.size();
 259         }
 260         ac.SetType(AttackChoice::SWORD);
 261         ts.SelectMonsters();
 262         ts.SetSingle();
 263         ts.Select(target);
 264 }
 265
 266 AttackChoice &BattleState::Order::GetAttackChoice(BattleState &b) const {
 267         switch (by) {
 268                 case HERO:
 269                         return b.HeroAt(index).GetAttackChoice();
 270                 case CAPSULE:
 271                         return b.GetCapsule().GetAttackChoice();
 272                 case MONSTER:
 273                         return b.MonsterAt(index).GetAttackChoice();
 274                 default:
 275                         throw std::runtime_error("invalid case in BttleStats::Order::GetAttackChoice()");
 276         }
 277 }
 278
 279 Stats &BattleState::Order::GetStats(BattleState &b) const {
 280         switch (by) {
 281                 case HERO:
 282                         return b.HeroAt(index).GetStats();
 283                 case CAPSULE:
 284                         return b.GetCapsule().GetStats();
 285                 case MONSTER:
 286                         return b.MonsterAt(index).GetStats();
 287                 default:
 288                         throw std::runtime_error("invalid case in BttleStats::Order::GetAttackChoice()");
 289         }
 290 }
 291
 292 void BattleState::CalculateDamage(const Stats &attackerStats, TargetSelection &ts) const {
 293         bool hitSome(false);
 294         if (ts.TargetsMonsters()) {
 295                 for (int i(0); i < MaxMonsters(); ++i) {
 296                         if (ts.IsSelected(i)) {
 297                                 if (MonsterAt(i).Health() > 0) {
 298                                         const Stats &defenderStats(MonsterAt(i).GetStats());
 299                                         Uint16 damage(CalculateDamage(attackerStats, defenderStats));
 300                                         ts.SetBad(i, damage);
 301                                         hitSome = true;
 302                                 } else {
 303                                         ts.Unselect(i);
 304                                 }
 305                         }
 306                 }
 307                 if (hitSome) return;
 308                 for (int i(0); i < MaxMonsters(); ++i) {
 309                         if (MonsterAt(i).Health() > 0) {
 310                                 const Stats &defenderStats(MonsterAt(i).GetStats());
 311                                 Uint16 damage(CalculateDamage(attackerStats, defenderStats));
 312                                 ts.SetBad(i, damage);
 313                                 break;
 314                         }
 315                 }
 316         } else {
 317                 for (int i(0); i < NumHeroes(); ++i) {
 318                         if (ts.IsSelected(i)) {
 319                                 if (HeroAt(i).Health() > 0) {
 320                                         const Stats &defenderStats(HeroAt(i).GetStats());
 321                                         Uint16 damage(CalculateDamage(attackerStats, defenderStats));
 322                                         ts.SetBad(i, damage);
 323                                         hitSome = true;
 324                                 } else {
 325                                         ts.Unselect(i);
 326                                 }
 327                         }
 328                 }
 329                 if (hitSome) return;
 330                 for (int i(0); i < NumHeroes(); ++i) {
 331                         if (HeroAt(i).Health() > 0) {
 332                                 const Stats &defenderStats(HeroAt(i).GetStats());
 333                                 Uint16 damage(CalculateDamage(attackerStats, defenderStats));
 334                                 ts.SetBad(i, damage);
 335                                 break;
 336                         }
 337                 }
 338         }
 339 }
 340
 341 Uint16 BattleState::CalculateDamage(const Stats &attacker, const Stats &defender) const {
 342         return attacker.Attack() / 2 - defender.Defense() / 4;
 343 }
 344
 345 void BattleState::ApplyDamage() {
 346         if (attackCursor < 0) return;
 347         AttackChoice &ac = CurrentAttack().GetAttackChoice(*this);
 348         TargetSelection &ts(ac.Selection());
 349         if (ts.TargetsMonsters()) {
 350                 for (int i(0); i < MaxMonsters(); ++i) {
 351                         Monster &monster(MonsterAt(i));
 352                         if (ts.IsBad(i)) {
 353                                 monster.SubtractHealth(ts.GetAmount(i));
 354                                 if (monster.Health() == 0) {
 355                                         expReward += monster.ExpReward();
 356                                         goldReward += monster.GoldReward();
 357                                 }
 358                         }
 359                 }
 360         } else {
 361                 for (int i(0); i < NumHeroes(); ++i) {
 362                         Hero &hero(HeroAt(i));
 363                         if (ts.IsBad(i)) {
 364                                 hero.SubtractHealth(ts.GetAmount(i));
 365                         }
 366                 }
 367         }
 368 }
 369
 370 AttackChoice &BattleState::CurrentAttackAttackChoice() {
 371         return CurrentAttack().GetAttackChoice(*this);
 372 }
 373
 374 void BattleState::ClearAllAttacks() {
 375         attackCursor = -1;
 376         activeHero = -1;
 377         for (int i(0); i < NumHeroes(); ++i) {
 378                 HeroAt(i).GetAttackChoice() = AttackChoice(this);
 379         }
 380         for (int i(0); i < MaxMonsters(); ++i) {
 381                 MonsterAt(i).GetAttackChoice() = AttackChoice(this);
 382         }
 383         capsule.GetAttackChoice() = AttackChoice(this);
 384         attackOrder.clear();
 385 }
 386
 387
 388 void BattleState::HandleEvents(const Input &input) {
 389
 390 }
 391
 392 void BattleState::UpdateWorld(float deltaT) {
 393
 394 }
 395
 396 void BattleState::Render(SDL_Surface *screen) {
 397         assert(screen);
 398         Vector<int> offset(CalculateScreenOffset(screen));
 399         RenderBackground(screen, offset);
 400         RenderMonsters(screen, offset);
 401 }
 402
 403 void BattleState::RenderBackground(SDL_Surface *screen, const Vector<int> &offset) {
 404         assert(screen);
 405         // black for now
 406         SDL_FillRect(screen, 0, SDL_MapRGB(screen->format, 0, 0, 0));
 407         SDL_Rect destRect;
 408         destRect.x = offset.X();
 409         destRect.y = offset.Y();
 410         destRect.w = background->w;
 411         destRect.h = background->h;
 412         SDL_BlitSurface(background, 0, screen, &destRect);
 413 }
 414
 415 void BattleState::RenderMonsters(SDL_Surface *screen, const Vector<int> &offset) {
 416         assert(screen);
 417         for (vector<Monster>::size_type i(0), end(monsters.size()); i < end; ++i) {
 418                 if (MonsterPositionOccupied(i)) {
 419                         if (monsters[i].GetAnimation().Running()) {
 420                                 monsters[i].GetAnimation().DrawCenter(screen, monsters[i].Position() + offset);
 421                         } else {
 422                                 monsters[i].Sprite()->DrawCenter(screen, monsters[i].Position() + offset);
 423                         }
 424                 }
 425         }
 426 }
 427
 428 void BattleState::RenderHeroes(SDL_Surface *screen, const Vector<int> &offset) {
 429         assert(screen);
 430         for (int i(0); i < numHeroes; ++i) {
 431                 if (heroes[i].GetAnimation().Running()) {
 432                         heroes[i].GetAnimation().DrawCenter(screen, heroes[i].Position() + offset);
 433                 } else {
 434                         int row(heroes[i].Health() > 0 ? 0 : 2);
 435                         heroes[i].Sprite()->DrawCenter(screen, heroes[i].Position() + offset, 1, row);
 436                 }
 437         }
 438 }
 439
 440 void BattleState::RenderCapsule(SDL_Surface *screen, const Vector<int> &offset) {
 441         if (capsule.Health() <= 0) return;
 442         if (capsule.GetAnimation().Running()) {
 443                 capsule.GetAnimation().DrawCenter(screen, capsule.Position() + offset);
 444         } else {
 445                 capsule.Sprite()->DrawCenter(screen, capsule.Position() + offset);
 446         }
 447 }
 448
 449 void BattleState::RenderHeroTags(SDL_Surface *screen, const Vector<int> &offset) {
 450         assert(screen);
 451         int tagHeight(attackTypeMenu.Height());
 452         int tagWidth(attackTypeMenu.Width() * 2 + attackTypeMenu.Width() / 2);
 453
 454         for (int i(0); i < numHeroes; ++i) {
 455                 heroTags[i].Render(screen, tagWidth, tagHeight, heroTagPositions[i] + offset, (int)i == activeHero);
 456         }
 457 }
 458
 459 void BattleState::RenderSmallHeroTags(SDL_Surface *screen, const Vector<int> &offset) {
 460         assert(screen);
 461         int tagHeight(res->normalFont->CharHeight() * 4 + res->smallHeroTagFrame->BorderHeight() * 2);
 462         int tagWidth(res->normalFont->CharWidth() * 6 + res->smallHeroTagFrame->BorderWidth() * 2);
 463
 464         SDL_Rect rect;
 465         rect.x = offset.X();
 466         rect.y = offset.Y() + Height() - tagHeight;
 467         rect.w = Width();
 468         rect.h = tagHeight;
 469         SDL_FillRect(screen, &rect, SDL_MapRGB(screen->format, 0, 0, 0));
 470         rect.y += res->normalFont->CharHeight() / 8;
 471         rect.h -= res->normalFont->CharHeight() / 4;
 472         SDL_FillRect(screen, &rect, res->heroesBgColor.MapRGB(screen->format));
 473
 474         for (int i(0); i < numHeroes; ++i) {
 475                 smallHeroTags[i].Render(screen, tagWidth, tagHeight, smallHeroTagPositions[i] + offset);
 476         }
 477 }
 478
 479 }