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         offset = Vector<int>(
  77                                 (w - background->w) / 2,
  78                                 (h - background->h) / 2);
  79 }
  80
  81
  82 void BattleState::OnEnterState(SDL_Surface *screen) {
  83         for (int i(0); i < 4; ++i) {
  84                 heroes[i].Position() = heroesLayout->CalculatePosition(i, background->w, background->h);
  85                 heroes[i].SpellMenu() = *res->spellMenuProperties;
  86                 heroes[i].UpdateSpellMenu();
  87                 heroes[i].IkariMenu() = *res->ikariMenuProperties;
  88                 heroes[i].UpdateIkariMenu(res);
  89                 heroTags[i] = HeroTag(this, i);
  90                 smallHeroTags[i] = SmallHeroTag(this, i);
  91         }
  92
  93         capsule.Position() = heroesLayout->CalculatePosition(4, background->w, background->h);
  94
  95         for (int i(0); i < int(monsters.size()); ++i) {
  96                 monsters[i].Position() = monstersLayout->CalculatePosition(i, background->w, background->h);
  97         }
  98
  99         int tagHeight(attackTypeMenu.Height());
 100         int tagWidth(attackTypeMenu.Width() * 2 + attackTypeMenu.Width() / 2);
 101         int xOffset((Width() - 2 * tagWidth) / 2);
 102         heroTagPositions[0] = Vector<int>(xOffset, Height() - 2 * tagHeight);
 103         heroTagPositions[1] = Vector<int>(xOffset + tagWidth, Height() - 2 * tagHeight);
 104         heroTagPositions[2] = Vector<int>(xOffset, Height() - tagHeight);
 105         heroTagPositions[3] = Vector<int>(xOffset + tagWidth, Height() - tagHeight);
 106
 107         tagHeight = res->normalFont->CharHeight() * 4 + res->smallHeroTagFrame->BorderHeight() * 2;
 108         tagWidth = res->normalFont->CharWidth() * 6 + res->smallHeroTagFrame->BorderWidth() * 2;
 109         xOffset = (Width() - 4 * tagWidth) / 2;
 110         int yOffset(Height() - tagHeight);
 111         smallHeroTagPositions[0] = Vector<int>(xOffset, yOffset);
 112         smallHeroTagPositions[1] = Vector<int>(xOffset + 2 * tagWidth, yOffset);
 113         smallHeroTagPositions[2] = Vector<int>(xOffset + tagWidth, yOffset);
 114         smallHeroTagPositions[3] = Vector<int>(xOffset + 3 * tagWidth, yOffset);
 115
 116         OnResize(screen->w, screen->h);
 117
 118         itemMenu = *res->itemMenuProperties;
 119         LoadInventory();
 120         ClearAllAttacks();
 121 }
 122
 123 void BattleState::LoadInventory() {
 124         const Inventory &inv(game->state->inventory);
 125         itemMenu.Clear();
 126         itemMenu.Reserve(inv.MaxItems());
 127         for (int i(0); i < inv.MaxItems(); ++i) {
 128                 const Item *item(inv.ItemAt(i));
 129                 if (item) {
 130                         itemMenu.Add(item->Name(), item, item->CanUseInBattle(), item->MenuIcon(), inv.ItemCountAt(i));
 131                 } else {
 132                         itemMenu.AddEmptyEntry();
 133                 }
 134         }
 135 }
 136
 137 void BattleState::OnExitState(SDL_Surface *screen) {
 138
 139 }
 140
 141 void BattleState::OnResumeState(SDL_Surface *screen) {
 142         if (ranAway) {
 143                 Ctrl().PopState(); // quit the battle scene
 144                 return;
 145         }
 146         if (Victory()) {
 147                 Ctrl().PopState();
 148                 return;
 149         }
 150         if (Defeat()) {
 151                 Ctrl().PopState();
 152                 return;
 153         }
 154         // TODO: this should not push a state while quitting
 155         if (AttackSelectionDone()) {
 156                 Ctrl().PushState(new PerformAttacks(this));
 157         } else {
 158                 Ctrl().PushState(new SelectMoveAction(this));
 159         }
 160 }
 161
 162 bool BattleState::Victory() const {
 163         for (int i(0); i < MaxMonsters(); ++i) {
 164                 if (MonsterAt(i).Health() > 0) return false;
 165         }
 166         return true;
 167 }
 168
 169 bool BattleState::Defeat() const {
 170         for (int i(0); i < NumHeroes(); ++i) {
 171                 if (HeroAt(i).Health() > 0) return false;
 172         }
 173         return true;
 174 }
 175
 176 void BattleState::OnPauseState(SDL_Surface *screen) {
 177
 178 }
 179
 180
 181 class OrderCompare {
 182         public:
 183                 OrderCompare(BattleState *battle) : battle(battle) { }
 184                 bool operator ()(const BattleState::Order &lhs, const BattleState::Order &rhs) {
 185                         return lhs.GetStats(*battle).Agility() > rhs.GetStats(*battle).Agility();
 186                 }
 187         private:
 188                 BattleState *battle;
 189 };
 190
 191 void BattleState::CalculateAttackOrder() {
 192         attackOrder.reserve(monsters.size() + NumHeroes());
 193         for (int i(0); i < NumHeroes(); ++i) {
 194                 attackOrder.push_back(Order(Order::HERO, i));
 195         }
 196         for (vector<Monster>::size_type i(0), end(monsters.size()); i < end; ++i) {
 197                 attackOrder.push_back(Order(Order::MONSTER, i));
 198                 MonsterAt(i).GetAttackChoice() = AttackChoice(this);
 199         }
 200         if (capsule.Active() && capsule.Health() > 0) {
 201                 attackOrder.push_back(Order(Order::CAPSULE));
 202         }
 203         std::sort(attackOrder.begin(), attackOrder.end(), OrderCompare(this));
 204 }
 205
 206 void BattleState::NextAttack() {
 207         if (Victory() || Defeat()) {
 208                 attackCursor = attackOrder.size();
 209                 return;
 210         }
 211         ++attackCursor;
 212         while (attackCursor < int(attackOrder.size())) {
 213                 if (attackOrder[attackCursor].IsMonster()) {
 214                         if (MonsterAt(attackOrder[attackCursor].index).Health() > 0) break;
 215                 } else if (attackOrder[attackCursor].IsHero()) {
 216                         if (HeroAt(attackOrder[attackCursor].index).Health() > 0) break;
 217                 } else {
 218                         if (capsule.Active() && capsule.Health() > 0) break;
 219                 }
 220                 ++attackCursor;
 221         }
 222 }
 223
 224 bool BattleState::AttacksFinished() const {
 225         return attackCursor >= int(attackOrder.size())
 226                         || Victory() || Defeat();
 227 }
 228
 229 void BattleState::CalculateDamage() {
 230         if (CurrentAttack().IsMonster()) {
 231                 DecideMonsterAttack(MonsterAt(CurrentAttack().index));
 232         } else if (CurrentAttack().IsCapsule()) {
 233                 DecideCapsuleAttack();
 234         }
 235         AttackChoice &ac = CurrentAttack().GetAttackChoice(*this);
 236         if (ac.GetType() == AttackChoice::DEFEND) return;
 237         TargetSelection &ts(ac.Selection());
 238
 239         const Stats &attackerStats = CurrentAttack().GetStats(*this);
 240         CalculateDamage(attackerStats, ts);
 241 }
 242
 243 void BattleState::DecideMonsterAttack(Monster &m) {
 244         AttackChoice &ac(m.GetAttackChoice());
 245         TargetSelection &ts(ac.Selection());
 246         ac.Reset();
 247         int target(rand() % NumHeroes());
 248         while (!HeroPositionOccupied(target)) {
 249                 target = rand() % NumHeroes();
 250         }
 251         ac.SetType(AttackChoice::SWORD);
 252         ts.SelectHeroes();
 253         ts.SetSingle();
 254         ts.Select(target);
 255 }
 256
 257 void BattleState::DecideCapsuleAttack() {
 258         AttackChoice &ac(capsule.GetAttackChoice());
 259         TargetSelection &ts(ac.Selection());
 260         ac.Reset();
 261         int target(rand() % monsters.size());
 262         while (!MonsterPositionOccupied(target)) {
 263                 target = rand() % monsters.size();
 264         }
 265         ac.SetType(AttackChoice::SWORD);
 266         ts.SelectMonsters();
 267         ts.SetSingle();
 268         ts.Select(target);
 269 }
 270
 271 AttackChoice &BattleState::Order::GetAttackChoice(BattleState &b) const {
 272         switch (by) {
 273                 case HERO:
 274                         return b.HeroAt(index).GetAttackChoice();
 275                 case CAPSULE:
 276                         return b.GetCapsule().GetAttackChoice();
 277                 case MONSTER:
 278                         return b.MonsterAt(index).GetAttackChoice();
 279                 default:
 280                         throw std::runtime_error("invalid case in BttleStats::Order::GetAttackChoice()");
 281         }
 282 }
 283
 284 Stats &BattleState::Order::GetStats(BattleState &b) const {
 285         switch (by) {
 286                 case HERO:
 287                         return b.HeroAt(index).GetStats();
 288                 case CAPSULE:
 289                         return b.GetCapsule().GetStats();
 290                 case MONSTER:
 291                         return b.MonsterAt(index).GetStats();
 292                 default:
 293                         throw std::runtime_error("invalid case in BttleStats::Order::GetAttackChoice()");
 294         }
 295 }
 296
 297 void BattleState::CalculateDamage(const Stats &attackerStats, TargetSelection &ts) const {
 298         bool hitSome(false);
 299         if (ts.TargetsMonsters()) {
 300                 for (int i(0); i < MaxMonsters(); ++i) {
 301                         if (ts.IsSelected(i)) {
 302                                 if (MonsterAt(i).Health() > 0) {
 303                                         const Stats &defenderStats(MonsterAt(i).GetStats());
 304                                         Uint16 damage(CalculateDamage(attackerStats, defenderStats));
 305                                         ts.SetBad(i, damage);
 306                                         hitSome = true;
 307                                 } else {
 308                                         ts.Unselect(i);
 309                                 }
 310                         }
 311                 }
 312                 if (hitSome) return;
 313                 for (int i(0); i < MaxMonsters(); ++i) {
 314                         if (MonsterAt(i).Health() > 0) {
 315                                 const Stats &defenderStats(MonsterAt(i).GetStats());
 316                                 Uint16 damage(CalculateDamage(attackerStats, defenderStats));
 317                                 ts.SetBad(i, damage);
 318                                 break;
 319                         }
 320                 }
 321         } else {
 322                 for (int i(0); i < NumHeroes(); ++i) {
 323                         if (ts.IsSelected(i)) {
 324                                 if (HeroAt(i).Health() > 0) {
 325                                         const Stats &defenderStats(HeroAt(i).GetStats());
 326                                         Uint16 damage(CalculateDamage(attackerStats, defenderStats));
 327                                         ts.SetBad(i, damage);
 328                                         hitSome = true;
 329                                 } else {
 330                                         ts.Unselect(i);
 331                                 }
 332                         }
 333                 }
 334                 if (hitSome) return;
 335                 for (int i(0); i < NumHeroes(); ++i) {
 336                         if (HeroAt(i).Health() > 0) {
 337                                 const Stats &defenderStats(HeroAt(i).GetStats());
 338                                 Uint16 damage(CalculateDamage(attackerStats, defenderStats));
 339                                 ts.SetBad(i, damage);
 340                                 break;
 341                         }
 342                 }
 343         }
 344 }
 345
 346 Uint16 BattleState::CalculateDamage(const Stats &attacker, const Stats &defender) const {
 347         return attacker.Attack() / 2 - defender.Defense() / 4;
 348 }
 349
 350 void BattleState::ApplyDamage() {
 351         if (attackCursor < 0) return;
 352         AttackChoice &ac = CurrentAttack().GetAttackChoice(*this);
 353         TargetSelection &ts(ac.Selection());
 354         if (ts.TargetsMonsters()) {
 355                 for (int i(0); i < MaxMonsters(); ++i) {
 356                         Monster &monster(MonsterAt(i));
 357                         if (ts.IsBad(i)) {
 358                                 monster.SubtractHealth(ts.GetAmount(i));
 359                                 if (monster.Health() == 0) {
 360                                         expReward += monster.ExpReward();
 361                                         goldReward += monster.GoldReward();
 362                                 }
 363                         }
 364                 }
 365         } else {
 366                 for (int i(0); i < NumHeroes(); ++i) {
 367                         Hero &hero(HeroAt(i));
 368                         if (ts.IsBad(i)) {
 369                                 hero.SubtractHealth(ts.GetAmount(i));
 370                         }
 371                 }
 372         }
 373 }
 374
 375 AttackChoice &BattleState::CurrentAttackAttackChoice() {
 376         return CurrentAttack().GetAttackChoice(*this);
 377 }
 378
 379 void BattleState::ClearAllAttacks() {
 380         attackCursor = -1;
 381         activeHero = -1;
 382         for (int i(0); i < NumHeroes(); ++i) {
 383                 HeroAt(i).GetAttackChoice() = AttackChoice(this);
 384         }
 385         for (int i(0); i < MaxMonsters(); ++i) {
 386                 MonsterAt(i).GetAttackChoice() = AttackChoice(this);
 387         }
 388         capsule.GetAttackChoice() = AttackChoice(this);
 389         attackOrder.clear();
 390 }
 391
 392
 393 void BattleState::HandleEvents(const Input &input) {
 394
 395 }
 396
 397 void BattleState::UpdateWorld(Uint32 deltaT) {
 398
 399 }
 400
 401 void BattleState::Render(SDL_Surface *screen) {
 402         assert(screen);
 403         RenderBackground(screen);
 404         RenderMonsters(screen);
 405 }
 406
 407 void BattleState::RenderBackground(SDL_Surface *screen) {
 408         assert(screen);
 409         // black for now
 410         SDL_FillRect(screen, 0, SDL_MapRGB(screen->format, 0, 0, 0));
 411         SDL_Rect destRect;
 412         destRect.x = offset.X();
 413         destRect.y = offset.Y();
 414         destRect.w = background->w;
 415         destRect.h = background->h;
 416         SDL_BlitSurface(background, 0, screen, &destRect);
 417 }
 418
 419 void BattleState::RenderMonsters(SDL_Surface *screen) {
 420         assert(screen);
 421         for (vector<Monster>::size_type i(0), end(monsters.size()); i < end; ++i) {
 422                 if (MonsterPositionOccupied(i)) {
 423                         if (monsters[i].GetAnimation().Running()) {
 424                                 monsters[i].GetAnimation().DrawCenter(screen, monsters[i].Position() + offset);
 425                         } else {
 426                                 monsters[i].Sprite()->DrawCenter(screen, monsters[i].Position() + offset);
 427                         }
 428                 }
 429         }
 430 }
 431
 432 void BattleState::RenderHeroes(SDL_Surface *screen) {
 433         assert(screen);
 434         for (int i(0); i < numHeroes; ++i) {
 435                 if (heroes[i].GetAnimation().Running()) {
 436                         heroes[i].GetAnimation().DrawCenter(screen, heroes[i].Position() + offset);
 437                 } else {
 438                         int row(heroes[i].Health() > 0 ? 0 : 2);
 439                         heroes[i].Sprite()->DrawCenter(screen, heroes[i].Position() + offset, 1, row);
 440                 }
 441         }
 442 }
 443
 444 void BattleState::RenderCapsule(SDL_Surface *screen) {
 445         if (!capsule.Active() || capsule.Health() <= 0) return;
 446         if (capsule.GetAnimation().Running()) {
 447                 capsule.GetAnimation().DrawCenter(screen, capsule.Position() + offset);
 448         } else {
 449                 capsule.Sprite()->DrawCenter(screen, capsule.Position() + offset);
 450         }
 451 }
 452
 453 void BattleState::RenderHeroTags(SDL_Surface *screen) {
 454         assert(screen);
 455         int tagHeight(attackTypeMenu.Height());
 456         int tagWidth(attackTypeMenu.Width() * 2 + attackTypeMenu.Width() / 2);
 457
 458         for (int i(0); i < numHeroes; ++i) {
 459                 heroTags[i].Render(screen, tagWidth, tagHeight, heroTagPositions[i] + offset, (int)i == activeHero);
 460         }
 461 }
 462
 463 void BattleState::RenderSmallHeroTags(SDL_Surface *screen) {
 464         assert(screen);
 465         int tagHeight(res->normalFont->CharHeight() * 4 + res->smallHeroTagFrame->BorderHeight() * 2);
 466         int tagWidth(res->normalFont->CharWidth() * 6 + res->smallHeroTagFrame->BorderWidth() * 2);
 467
 468         SDL_Rect rect;
 469         rect.x = offset.X();
 470         rect.y = offset.Y() + Height() - tagHeight;
 471         rect.w = Width();
 472         rect.h = tagHeight;
 473         SDL_FillRect(screen, &rect, SDL_MapRGB(screen->format, 0, 0, 0));
 474         rect.y += res->normalFont->CharHeight() / 8;
 475         rect.h -= res->normalFont->CharHeight() / 4;
 476         SDL_FillRect(screen, &rect, res->heroesBgColor.MapRGB(screen->format));
 477
 478         for (int i(0); i < numHeroes; ++i) {
 479                 smallHeroTags[i].Render(screen, tagWidth, tagHeight, smallHeroTagPositions[i] + offset);
 480         }
 481 }
 482
 483 }