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 #include "../math/Vector.h"
  16
  17 #include <algorithm>
  18 #include <cassert>
  19 #include <cstdlib>
  20 #include <stdexcept>
  21
  22 using app::Application;
  23 using app::Input;
  24 using common::Inventory;
  25 using common::Item;
  26 using common::Spell;
  27 using common::Stats;
  28 using math::Vector;
  29 using graphics::Menu;
  30
  31 using std::rand;
  32 using std::vector;
  33
  34 namespace battle {
  35
  36 void BattleState::AddMonster(const Monster &m) {
  37         if (monsters.size() >= monstersLayout->NumPositions()) {
  38                 throw std::overflow_error("too many monsters for layout");
  39         }
  40         monsters.push_back(m);
  41 }
  42
  43 void BattleState::AddHero(const Hero &h) {
  44         if (numHeroes >= 4 || numHeroes >= (int)heroesLayout->NumPositions()) {
  45                 throw std::overflow_error("too many heroes for layout");
  46         }
  47         heroes[numHeroes] = h;
  48         ++numHeroes;
  49 }
  50
  51 void BattleState::SetCapsule(const Capsule &c) {
  52         capsule = c;
  53 }
  54
  55 void BattleState::NextHero() {
  56         ++activeHero;
  57         while (activeHero < numHeroes && heroes[activeHero].Health() == 0) {
  58                 ++activeHero;
  59         }
  60 }
  61
  62 void BattleState::PreviousHero() {
  63         --activeHero;
  64         while (activeHero >= 0 && heroes[activeHero].Health() == 0) {
  65                 --activeHero;
  66         }
  67 }
  68
  69 void BattleState::SwapHeroes(int lhs, int rhs) {
  70         if (lhs < 0 || lhs >= numHeroes || rhs < 0 || rhs >= numHeroes || lhs == rhs) return;
  71         std::swap(heroes[lhs], heroes[rhs]);
  72 }
  73
  74
  75 void BattleState::OnResize(int w, int h) {
  76
  77 }
  78
  79
  80 void BattleState::OnEnterState(SDL_Surface *screen) {
  81         for (int i(0); i < 4; ++i) {
  82                 heroes[i].Position() = heroesLayout->CalculatePosition(i, background->w, background->h);
  83                 heroes[i].SpellMenu() = *res->spellMenuProperties;
  84                 heroes[i].UpdateSpellMenu();
  85                 heroes[i].IkariMenu() = *res->ikariMenuProperties;
  86                 heroes[i].UpdateIkariMenu(res);
  87                 heroTags[i] = HeroTag(this, i);
  88                 smallHeroTags[i] = SmallHeroTag(this, i);
  89         }
  90
  91         capsule.Position() = heroesLayout->CalculatePosition(4, background->w, background->h);
  92
  93         for (int i(0); i < int(monsters.size()); ++i) {
  94                 monsters[i].Position() = monstersLayout->CalculatePosition(i, background->w, background->h);
  95         }
  96
  97         int tagHeight(attackTypeMenu.Height());
  98         int tagWidth(attackTypeMenu.Width() * 2 + attackTypeMenu.Width() / 2);
  99         int xOffset((Width() - 2 * tagWidth) / 2);
 100         heroTagPositions[0] = Vector<int>(xOffset, Height() - 2 * tagHeight);
 101         heroTagPositions[1] = Vector<int>(xOffset + tagWidth, Height() - 2 * tagHeight);
 102         heroTagPositions[2] = Vector<int>(xOffset, Height() - tagHeight);
 103         heroTagPositions[3] = Vector<int>(xOffset + tagWidth, Height() - tagHeight);
 104
 105         tagHeight = res->normalFont->CharHeight() * 4 + res->smallHeroTagFrame->BorderHeight() * 2;
 106         tagWidth = res->normalFont->CharWidth() * 6 + res->smallHeroTagFrame->BorderWidth() * 2;
 107         xOffset = (Width() - 4 * tagWidth) / 2;
 108         int yOffset(Height() - tagHeight);
 109         smallHeroTagPositions[0] = Vector<int>(xOffset, yOffset);
 110         smallHeroTagPositions[1] = Vector<int>(xOffset + 2 * tagWidth, yOffset);
 111         smallHeroTagPositions[2] = Vector<int>(xOffset + tagWidth, yOffset);
 112         smallHeroTagPositions[3] = Vector<int>(xOffset + 3 * tagWidth, yOffset);
 113
 114         itemMenu = *res->itemMenuProperties;
 115         LoadInventory();
 116         ClearAllAttacks();
 117 }
 118
 119 void BattleState::LoadInventory() {
 120         const Inventory &inv(game->state->inventory);
 121         itemMenu.Clear();
 122         itemMenu.Reserve(inv.MaxItems());
 123         for (int i(0); i < inv.MaxItems(); ++i) {
 124                 const Item *item(inv.ItemAt(i));
 125                 if (item) {
 126                         itemMenu.Add(item->Name(), item, item->CanUseInBattle(), item->MenuIcon(), inv.ItemCountAt(i));
 127                 } else {
 128                         itemMenu.AddEmptyEntry();
 129                 }
 130         }
 131 }
 132
 133 void BattleState::OnExitState(SDL_Surface *screen) {
 134
 135 }
 136
 137 void BattleState::OnResumeState(SDL_Surface *screen) {
 138         if (ranAway) {
 139                 Ctrl().PopState(); // quit the battle scene
 140                 return;
 141         }
 142         if (Victory()) {
 143                 Ctrl().PopState();
 144                 return;
 145         }
 146         if (Defeat()) {
 147                 Ctrl().PopState();
 148                 return;
 149         }
 150         // TODO: this should not push a state while quitting
 151         if (AttackSelectionDone()) {
 152                 Ctrl().PushState(new PerformAttacks(this));
 153         } else {
 154                 Ctrl().PushState(new SelectMoveAction(this));
 155         }
 156 }
 157
 158 bool BattleState::Victory() const {
 159         for (int i(0); i < MaxMonsters(); ++i) {
 160                 if (MonsterAt(i).Health() > 0) return false;
 161         }
 162         return true;
 163 }
 164
 165 bool BattleState::Defeat() const {
 166         for (int i(0); i < NumHeroes(); ++i) {
 167                 if (HeroAt(i).Health() > 0) return false;
 168         }
 169         return true;
 170 }
 171
 172 void BattleState::OnPauseState(SDL_Surface *screen) {
 173
 174 }
 175
 176
 177 class OrderCompare {
 178         public:
 179                 OrderCompare(BattleState *battle) : battle(battle) { }
 180                 bool operator ()(const BattleState::Order &lhs, const BattleState::Order &rhs) {
 181                         return lhs.GetStats(*battle).Agility() > rhs.GetStats(*battle).Agility();
 182                 }
 183         private:
 184                 BattleState *battle;
 185 };
 186
 187 void BattleState::CalculateAttackOrder() {
 188         attackOrder.reserve(monsters.size() + NumHeroes());
 189         for (int i(0); i < NumHeroes(); ++i) {
 190                 attackOrder.push_back(Order(Order::HERO, i));
 191         }
 192         for (vector<Monster>::size_type i(0), end(monsters.size()); i < end; ++i) {
 193                 attackOrder.push_back(Order(Order::MONSTER, i));
 194                 MonsterAt(i).GetAttackChoice() = AttackChoice(this);
 195         }
 196         if (capsule.Active() && capsule.Health() > 0) {
 197                 attackOrder.push_back(Order(Order::CAPSULE));
 198         }
 199         std::sort(attackOrder.begin(), attackOrder.end(), OrderCompare(this));
 200 }
 201
 202 void BattleState::NextAttack() {
 203         if (Victory() || Defeat()) {
 204                 attackCursor = attackOrder.size();
 205                 return;
 206         }
 207         ++attackCursor;
 208         while (attackCursor < int(attackOrder.size())) {
 209                 if (attackOrder[attackCursor].IsMonster()) {
 210                         if (MonsterAt(attackOrder[attackCursor].index).Health() > 0) break;
 211                 } else if (attackOrder[attackCursor].IsHero()) {
 212                         if (HeroAt(attackOrder[attackCursor].index).Health() > 0) break;
 213                 } else {
 214                         if (capsule.Active() && capsule.Health() > 0) break;
 215                 }
 216                 ++attackCursor;
 217         }
 218 }
 219
 220 bool BattleState::AttacksFinished() const {
 221         return attackCursor >= int(attackOrder.size())
 222                         || Victory() || Defeat();
 223 }
 224
 225 void BattleState::CalculateDamage() {
 226         if (CurrentAttack().IsMonster()) {
 227                 DecideMonsterAttack(MonsterAt(CurrentAttack().index));
 228         } else if (CurrentAttack().IsCapsule()) {
 229                 DecideCapsuleAttack();
 230         }
 231         AttackChoice &ac = CurrentAttack().GetAttackChoice(*this);
 232         if (ac.GetType() == AttackChoice::DEFEND) return;
 233         TargetSelection &ts(ac.Selection());
 234
 235         const Stats &attackerStats = CurrentAttack().GetStats(*this);
 236         CalculateDamage(attackerStats, ts);
 237 }
 238
 239 void BattleState::DecideMonsterAttack(Monster &m) {
 240         AttackChoice &ac(m.GetAttackChoice());
 241         TargetSelection &ts(ac.Selection());
 242         ac.Reset();
 243         int target(rand() % NumHeroes());
 244         while (!HeroPositionOccupied(target)) {
 245                 target = rand() % NumHeroes();
 246         }
 247         ac.SetType(AttackChoice::SWORD);
 248         ts.SelectHeroes();
 249         ts.SetSingle();
 250         ts.Select(target);
 251 }
 252
 253 void BattleState::DecideCapsuleAttack() {
 254         AttackChoice &ac(capsule.GetAttackChoice());
 255         TargetSelection &ts(ac.Selection());
 256         ac.Reset();
 257         int target(rand() % monsters.size());
 258         while (!MonsterPositionOccupied(target)) {
 259                 target = rand() % monsters.size();
 260         }
 261         ac.SetType(AttackChoice::SWORD);
 262         ts.SelectMonsters();
 263         ts.SetSingle();
 264         ts.Select(target);
 265 }
 266
 267 AttackChoice &BattleState::Order::GetAttackChoice(BattleState &b) const {
 268         switch (by) {
 269                 case HERO:
 270                         return b.HeroAt(index).GetAttackChoice();
 271                 case CAPSULE:
 272                         return b.GetCapsule().GetAttackChoice();
 273                 case MONSTER:
 274                         return b.MonsterAt(index).GetAttackChoice();
 275                 default:
 276                         throw std::runtime_error("invalid case in BttleStats::Order::GetAttackChoice()");
 277         }
 278 }
 279
 280 Stats &BattleState::Order::GetStats(BattleState &b) const {
 281         switch (by) {
 282                 case HERO:
 283                         return b.HeroAt(index).GetStats();
 284                 case CAPSULE:
 285                         return b.GetCapsule().GetStats();
 286                 case MONSTER:
 287                         return b.MonsterAt(index).GetStats();
 288                 default:
 289                         throw std::runtime_error("invalid case in BttleStats::Order::GetAttackChoice()");
 290         }
 291 }
 292
 293 void BattleState::CalculateDamage(const Stats &attackerStats, TargetSelection &ts) const {
 294         bool hitSome(false);
 295         if (ts.TargetsMonsters()) {
 296                 for (int i(0); i < MaxMonsters(); ++i) {
 297                         if (ts.IsSelected(i)) {
 298                                 if (MonsterAt(i).Health() > 0) {
 299                                         const Stats &defenderStats(MonsterAt(i).GetStats());
 300                                         Uint16 damage(CalculateDamage(attackerStats, defenderStats));
 301                                         ts.SetBad(i, damage);
 302                                         hitSome = true;
 303                                 } else {
 304                                         ts.Unselect(i);
 305                                 }
 306                         }
 307                 }
 308                 if (hitSome) return;
 309                 for (int i(0); i < MaxMonsters(); ++i) {
 310                         if (MonsterAt(i).Health() > 0) {
 311                                 const Stats &defenderStats(MonsterAt(i).GetStats());
 312                                 Uint16 damage(CalculateDamage(attackerStats, defenderStats));
 313                                 ts.SetBad(i, damage);
 314                                 break;
 315                         }
 316                 }
 317         } else {
 318                 for (int i(0); i < NumHeroes(); ++i) {
 319                         if (ts.IsSelected(i)) {
 320                                 if (HeroAt(i).Health() > 0) {
 321                                         const Stats &defenderStats(HeroAt(i).GetStats());
 322                                         Uint16 damage(CalculateDamage(attackerStats, defenderStats));
 323                                         ts.SetBad(i, damage);
 324                                         hitSome = true;
 325                                 } else {
 326                                         ts.Unselect(i);
 327                                 }
 328                         }
 329                 }
 330                 if (hitSome) return;
 331                 for (int i(0); i < NumHeroes(); ++i) {
 332                         if (HeroAt(i).Health() > 0) {
 333                                 const Stats &defenderStats(HeroAt(i).GetStats());
 334                                 Uint16 damage(CalculateDamage(attackerStats, defenderStats));
 335                                 ts.SetBad(i, damage);
 336                                 break;
 337                         }
 338                 }
 339         }
 340 }
 341
 342 Uint16 BattleState::CalculateDamage(const Stats &attacker, const Stats &defender) const {
 343         return attacker.Attack() / 2 - defender.Defense() / 4;
 344 }
 345
 346 void BattleState::ApplyDamage() {
 347         if (attackCursor < 0) return;
 348         AttackChoice &ac = CurrentAttack().GetAttackChoice(*this);
 349         TargetSelection &ts(ac.Selection());
 350         if (ts.TargetsMonsters()) {
 351                 for (int i(0); i < MaxMonsters(); ++i) {
 352                         Monster &monster(MonsterAt(i));
 353                         if (ts.IsBad(i)) {
 354                                 monster.SubtractHealth(ts.GetAmount(i));
 355                                 if (monster.Health() == 0) {
 356                                         expReward += monster.ExpReward();
 357                                         goldReward += monster.GoldReward();
 358                                 }
 359                         }
 360                 }
 361         } else {
 362                 for (int i(0); i < NumHeroes(); ++i) {
 363                         Hero &hero(HeroAt(i));
 364                         if (ts.IsBad(i)) {
 365                                 hero.SubtractHealth(ts.GetAmount(i));
 366                         }
 367                 }
 368         }
 369 }
 370
 371 AttackChoice &BattleState::CurrentAttackAttackChoice() {
 372         return CurrentAttack().GetAttackChoice(*this);
 373 }
 374
 375 void BattleState::ClearAllAttacks() {
 376         attackCursor = -1;
 377         activeHero = -1;
 378         for (int i(0); i < NumHeroes(); ++i) {
 379                 HeroAt(i).GetAttackChoice() = AttackChoice(this);
 380         }
 381         for (int i(0); i < MaxMonsters(); ++i) {
 382                 MonsterAt(i).GetAttackChoice() = AttackChoice(this);
 383         }
 384         capsule.GetAttackChoice() = AttackChoice(this);
 385         attackOrder.clear();
 386 }
 387
 388
 389 void BattleState::HandleEvents(const Input &input) {
 390
 391 }
 392
 393 void BattleState::UpdateWorld(Uint32 deltaT) {
 394
 395 }
 396
 397 void BattleState::Render(SDL_Surface *screen) {
 398         assert(screen);
 399         Vector<int> offset(CalculateScreenOffset(screen));
 400         RenderBackground(screen, offset);
 401         RenderMonsters(screen, offset);
 402 }
 403
 404 void BattleState::RenderBackground(SDL_Surface *screen, const Vector<int> &offset) {
 405         assert(screen);
 406         // black for now
 407         SDL_FillRect(screen, 0, SDL_MapRGB(screen->format, 0, 0, 0));
 408         SDL_Rect destRect;
 409         destRect.x = offset.X();
 410         destRect.y = offset.Y();
 411         destRect.w = background->w;
 412         destRect.h = background->h;
 413         SDL_BlitSurface(background, 0, screen, &destRect);
 414 }
 415
 416 void BattleState::RenderMonsters(SDL_Surface *screen, const Vector<int> &offset) {
 417         assert(screen);
 418         for (vector<Monster>::size_type i(0), end(monsters.size()); i < end; ++i) {
 419                 if (MonsterPositionOccupied(i)) {
 420                         if (monsters[i].GetAnimation().Running()) {
 421                                 monsters[i].GetAnimation().DrawCenter(screen, monsters[i].Position() + offset);
 422                         } else {
 423                                 monsters[i].Sprite()->DrawCenter(screen, monsters[i].Position() + offset);
 424                         }
 425                 }
 426         }
 427 }
 428
 429 void BattleState::RenderHeroes(SDL_Surface *screen, const Vector<int> &offset) {
 430         assert(screen);
 431         for (int i(0); i < numHeroes; ++i) {
 432                 if (heroes[i].GetAnimation().Running()) {
 433                         heroes[i].GetAnimation().DrawCenter(screen, heroes[i].Position() + offset);
 434                 } else {
 435                         int row(heroes[i].Health() > 0 ? 0 : 2);
 436                         heroes[i].Sprite()->DrawCenter(screen, heroes[i].Position() + offset, 1, row);
 437                 }
 438         }
 439 }
 440
 441 void BattleState::RenderCapsule(SDL_Surface *screen, const Vector<int> &offset) {
 442         if (!capsule.Active() || capsule.Health() <= 0) return;
 443         if (capsule.GetAnimation().Running()) {
 444                 capsule.GetAnimation().DrawCenter(screen, capsule.Position() + offset);
 445         } else {
 446                 capsule.Sprite()->DrawCenter(screen, capsule.Position() + offset);
 447         }
 448 }
 449
 450 void BattleState::RenderHeroTags(SDL_Surface *screen, const Vector<int> &offset) {
 451         assert(screen);
 452         int tagHeight(attackTypeMenu.Height());
 453         int tagWidth(attackTypeMenu.Width() * 2 + attackTypeMenu.Width() / 2);
 454
 455         for (int i(0); i < numHeroes; ++i) {
 456                 heroTags[i].Render(screen, tagWidth, tagHeight, heroTagPositions[i] + offset, (int)i == activeHero);
 457         }
 458 }
 459
 460 void BattleState::RenderSmallHeroTags(SDL_Surface *screen, const Vector<int> &offset) {
 461         assert(screen);
 462         int tagHeight(res->normalFont->CharHeight() * 4 + res->smallHeroTagFrame->BorderHeight() * 2);
 463         int tagWidth(res->normalFont->CharWidth() * 6 + res->smallHeroTagFrame->BorderWidth() * 2);
 464
 465         SDL_Rect rect;
 466         rect.x = offset.X();
 467         rect.y = offset.Y() + Height() - tagHeight;
 468         rect.w = Width();
 469         rect.h = tagHeight;
 470         SDL_FillRect(screen, &rect, SDL_MapRGB(screen->format, 0, 0, 0));
 471         rect.y += res->normalFont->CharHeight() / 8;
 472         rect.h -= res->normalFont->CharHeight() / 4;
 473         SDL_FillRect(screen, &rect, res->heroesBgColor.MapRGB(screen->format));
 474
 475         for (int i(0); i < numHeroes; ++i) {
 476                 smallHeroTags[i].Render(screen, tagWidth, tagHeight, smallHeroTagPositions[i] + offset);
 477         }
 478 }
 479
 480 }