/* * This file is part of OpenTTD. * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2. * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see . */ /** * @file disaster_vehicle.cpp * * All disaster/easter egg vehicles are handled here. * The general flow of control for the disaster vehicles is as follows: *
    *
  1. Initialize the disaster in a disaster specific way (eg start position, * possible target, etc.) Disaster_XXX_Init() function *
  2. Add a subtype to a disaster, which is an index into the function array * that handles the vehicle's ticks. *
  3. Run the disaster vehicles each tick until their target has been reached, * this happens in the DisasterTick_XXX() functions. In here, a vehicle's * state is kept by v->state variable. Each achieved sub-target * will increase this value, and the last one will remove the disaster itself *
*/ #include "stdafx.h" #include "aircraft.h" #include "disaster_vehicle.h" #include "industry.h" #include "station_base.h" #include "command_func.h" #include "news_func.h" #include "town.h" #include "company_func.h" #include "strings_func.h" #include "viewport_func.h" #include "vehicle_func.h" #include "sound_func.h" #include "effectvehicle_func.h" #include "roadveh.h" #include "train.h" #include "ai/ai.hpp" #include "game/game.hpp" #include "company_base.h" #include "core/random_func.hpp" #include "core/backup_type.hpp" #include "landscape_cmd.h" #include "timer/timer.h" #include "timer/timer_game_calendar.h" #include "table/strings.h" #include "safeguards.h" /** Delay counter for considering the next disaster. */ uint16_t _disaster_delay; static void DisasterClearSquare(TileIndex tile) { if (EnsureNoVehicleOnGround(tile).Failed()) return; switch (GetTileType(tile)) { case MP_RAILWAY: if (Company::IsHumanID(GetTileOwner(tile)) && !IsRailDepot(tile)) { Backup cur_company(_current_company, OWNER_WATER, FILE_LINE); Command::Do(DC_EXEC, tile); cur_company.Restore(); /* update signals in buffer */ UpdateSignalsInBuffer(); } break; case MP_HOUSE: { Backup cur_company(_current_company, OWNER_NONE, FILE_LINE); Command::Do(DC_EXEC, tile); cur_company.Restore(); break; } case MP_TREES: case MP_CLEAR: DoClearSquare(tile); break; default: break; } } static const SpriteID _disaster_images_1[] = {SPR_BLIMP, SPR_BLIMP, SPR_BLIMP, SPR_BLIMP, SPR_BLIMP, SPR_BLIMP, SPR_BLIMP, SPR_BLIMP}; static const SpriteID _disaster_images_2[] = {SPR_UFO_SMALL_SCOUT, SPR_UFO_SMALL_SCOUT, SPR_UFO_SMALL_SCOUT, SPR_UFO_SMALL_SCOUT, SPR_UFO_SMALL_SCOUT, SPR_UFO_SMALL_SCOUT, SPR_UFO_SMALL_SCOUT, SPR_UFO_SMALL_SCOUT}; static const SpriteID _disaster_images_3[] = {SPR_F_15, SPR_F_15, SPR_F_15, SPR_F_15, SPR_F_15, SPR_F_15, SPR_F_15, SPR_F_15}; static const SpriteID _disaster_images_4[] = {SPR_SUB_SMALL_NE, SPR_SUB_SMALL_NE, SPR_SUB_SMALL_SE, SPR_SUB_SMALL_SE, SPR_SUB_SMALL_SW, SPR_SUB_SMALL_SW, SPR_SUB_SMALL_NW, SPR_SUB_SMALL_NW}; static const SpriteID _disaster_images_5[] = {SPR_SUB_LARGE_NE, SPR_SUB_LARGE_NE, SPR_SUB_LARGE_SE, SPR_SUB_LARGE_SE, SPR_SUB_LARGE_SW, SPR_SUB_LARGE_SW, SPR_SUB_LARGE_NW, SPR_SUB_LARGE_NW}; static const SpriteID _disaster_images_6[] = {SPR_UFO_HARVESTER, SPR_UFO_HARVESTER, SPR_UFO_HARVESTER, SPR_UFO_HARVESTER, SPR_UFO_HARVESTER, SPR_UFO_HARVESTER, SPR_UFO_HARVESTER, SPR_UFO_HARVESTER}; static const SpriteID _disaster_images_7[] = {SPR_XCOM_SKYRANGER, SPR_XCOM_SKYRANGER, SPR_XCOM_SKYRANGER, SPR_XCOM_SKYRANGER, SPR_XCOM_SKYRANGER, SPR_XCOM_SKYRANGER, SPR_XCOM_SKYRANGER, SPR_XCOM_SKYRANGER}; static const SpriteID _disaster_images_8[] = {SPR_AH_64A, SPR_AH_64A, SPR_AH_64A, SPR_AH_64A, SPR_AH_64A, SPR_AH_64A, SPR_AH_64A, SPR_AH_64A}; static const SpriteID _disaster_images_9[] = {SPR_ROTOR_MOVING_1, SPR_ROTOR_MOVING_1, SPR_ROTOR_MOVING_1, SPR_ROTOR_MOVING_1, SPR_ROTOR_MOVING_1, SPR_ROTOR_MOVING_1, SPR_ROTOR_MOVING_1, SPR_ROTOR_MOVING_1}; static const SpriteID * const _disaster_images[] = { _disaster_images_1, _disaster_images_1, ///< zeppeliner and zeppeliner shadow _disaster_images_2, _disaster_images_2, ///< small ufo and small ufo shadow _disaster_images_3, _disaster_images_3, ///< combat aircraft and shadow _disaster_images_8, _disaster_images_8, _disaster_images_9, ///< combat helicopter, shadow and rotor _disaster_images_6, _disaster_images_6, ///< big ufo and shadow _disaster_images_7, _disaster_images_7, ///< skyranger and shadow _disaster_images_4, _disaster_images_5, ///< small and big submarine sprites }; void DisasterVehicle::UpdateImage() { SpriteID img = this->image_override; if (img == 0) img = _disaster_images[this->subtype][this->direction]; this->sprite_cache.sprite_seq.Set(img); } /** * Construct the disaster vehicle. * @param x The X coordinate. * @param y The Y coordinate. * @param direction The direction the vehicle is facing. * @param subtype The sub type of vehicle. * @param big_ufo_destroyer_target The target for the UFO destroyer. */ DisasterVehicle::DisasterVehicle(int x, int y, Direction direction, DisasterSubType subtype, VehicleID big_ufo_destroyer_target) : SpecializedVehicleBase(), big_ufo_destroyer_target(big_ufo_destroyer_target) { this->vehstatus = VS_UNCLICKABLE; this->x_pos = x; this->y_pos = y; switch (subtype) { case ST_ZEPPELINER: case ST_SMALL_UFO: case ST_AIRPLANE: case ST_HELICOPTER: case ST_BIG_UFO: case ST_BIG_UFO_DESTROYER: GetAircraftFlightLevelBounds(this, &this->z_pos, nullptr); break; case ST_HELICOPTER_ROTORS: GetAircraftFlightLevelBounds(this, &this->z_pos, nullptr); this->z_pos += ROTOR_Z_OFFSET; break; case ST_SMALL_SUBMARINE: case ST_BIG_SUBMARINE: this->z_pos = 0; break; case ST_ZEPPELINER_SHADOW: case ST_SMALL_UFO_SHADOW: case ST_AIRPLANE_SHADOW: case ST_HELICOPTER_SHADOW: case ST_BIG_UFO_SHADOW: case ST_BIG_UFO_DESTROYER_SHADOW: this->z_pos = 0; this->vehstatus |= VS_SHADOW; break; } this->direction = direction; this->tile = TileVirtXY(x, y); this->subtype = subtype; this->UpdateDeltaXY(); this->owner = OWNER_NONE; this->image_override = 0; this->state = 0; this->UpdateImage(); this->UpdatePositionAndViewport(); } /** * Update the position of the vehicle. * @param x The new X-coordinate. * @param y The new Y-coordinate. * @param z The new Z-coordinate. */ void DisasterVehicle::UpdatePosition(int x, int y, int z) { this->x_pos = x; this->y_pos = y; this->z_pos = z; this->tile = TileVirtXY(x, y); this->UpdateImage(); this->UpdatePositionAndViewport(); DisasterVehicle *u = this->Next(); if (u != nullptr) { int safe_x = Clamp(x, 0, Map::MaxX() * TILE_SIZE); int safe_y = Clamp(y - 1, 0, Map::MaxY() * TILE_SIZE); u->x_pos = x; u->y_pos = y - 1 - (std::max(z - GetSlopePixelZ(safe_x, safe_y), 0) >> 3); safe_y = Clamp(u->y_pos, 0, Map::MaxY() * TILE_SIZE); u->z_pos = GetSlopePixelZ(safe_x, safe_y); u->direction = this->direction; u->UpdateImage(); u->UpdatePositionAndViewport(); if ((u = u->Next()) != nullptr) { u->x_pos = x; u->y_pos = y; u->z_pos = z + ROTOR_Z_OFFSET; u->UpdatePositionAndViewport(); } } } /** * Zeppeliner handling, v->state states: * 0: Zeppeliner initialization has found a small airport, go there and crash * 1: Create crash and animate falling down for extra dramatic effect * 2: Create more smoke and leave debris on ground * 2: Clear the runway after some time and remove crashed zeppeliner * If not airport was found, only state 0 is reached until zeppeliner leaves map */ static bool DisasterTick_Zeppeliner(DisasterVehicle *v) { v->tick_counter++; if (v->state < 2) { if (HasBit(v->tick_counter, 0)) return true; GetNewVehiclePosResult gp = GetNewVehiclePos(v); v->UpdatePosition(gp.x, gp.y, GetAircraftFlightLevel(v)); if (v->state == 1) { if (++v->age == 38) { v->state = 2; v->age = 0; } if (GB(v->tick_counter, 0, 3) == 0) CreateEffectVehicleRel(v, 0, -17, 2, EV_CRASH_SMOKE); } else if (v->state == 0) { if (IsValidTile(v->tile) && IsAirportTile(v->tile)) { v->state = 1; v->age = 0; SetDParam(0, GetStationIndex(v->tile)); AddTileNewsItem(STR_NEWS_DISASTER_ZEPPELIN, NT_ACCIDENT, v->tile); AI::NewEvent(GetTileOwner(v->tile), new ScriptEventDisasterZeppelinerCrashed(GetStationIndex(v->tile))); } } if (v->y_pos >= (int)((Map::SizeY() + 9) * TILE_SIZE - 1)) { delete v; return false; } return true; } if (v->state > 2) { if (++v->age <= 13320) return true; if (IsValidTile(v->tile) && IsAirportTile(v->tile)) { Station *st = Station::GetByTile(v->tile); CLRBITS(st->airport.flags, RUNWAY_IN_block); AI::NewEvent(GetTileOwner(v->tile), new ScriptEventDisasterZeppelinerCleared(st->index)); } v->UpdatePosition(v->x_pos, v->y_pos, GetAircraftFlightLevel(v)); delete v; return false; } int x = v->x_pos; int y = v->y_pos; int z = GetSlopePixelZ(x, y); if (z < v->z_pos) z = v->z_pos - 1; v->UpdatePosition(x, y, z); if (++v->age == 1) { CreateEffectVehicleRel(v, 0, 7, 8, EV_EXPLOSION_LARGE); if (_settings_client.sound.disaster) SndPlayVehicleFx(SND_12_EXPLOSION, v); v->image_override = SPR_BLIMP_CRASHING; } else if (v->age == 70) { v->image_override = SPR_BLIMP_CRASHED; } else if (v->age <= 300) { if (GB(v->tick_counter, 0, 3) == 0) { uint32_t r = Random(); CreateEffectVehicleRel(v, GB(r, 0, 4) - 7, GB(r, 4, 4) - 7, GB(r, 8, 3) + 5, EV_EXPLOSION_SMALL); } } else if (v->age == 350) { v->state = 3; v->age = 0; } if (IsValidTile(v->tile) && IsAirportTile(v->tile)) { SETBITS(Station::GetByTile(v->tile)->airport.flags, RUNWAY_IN_block); } return true; } /** * (Small) Ufo handling, v->state states: * 0: Fly around to the middle of the map, then randomly, after a while target a road vehicle * 1: Home in on a road vehicle and crash it >:) * If not road vehicle was found, only state 0 is used and Ufo disappears after a while */ static bool DisasterTick_Ufo(DisasterVehicle *v) { v->image_override = (HasBit(++v->tick_counter, 3)) ? SPR_UFO_SMALL_SCOUT_DARKER : SPR_UFO_SMALL_SCOUT; if (v->state == 0) { /* Fly around randomly */ int x = TileX(v->dest_tile) * TILE_SIZE; int y = TileY(v->dest_tile) * TILE_SIZE; if (Delta(x, v->x_pos) + Delta(y, v->y_pos) >= (int)TILE_SIZE) { v->direction = GetDirectionTowards(v, x, y); GetNewVehiclePosResult gp = GetNewVehiclePos(v); v->UpdatePosition(gp.x, gp.y, GetAircraftFlightLevel(v)); return true; } if (++v->age < 6) { v->dest_tile = RandomTile(); return true; } v->state = 1; uint n = 0; // Total number of targetable road vehicles. for (const RoadVehicle *u : RoadVehicle::Iterate()) { if (u->IsFrontEngine()) n++; } if (n == 0) { /* If there are no targetable road vehicles, destroy the UFO. */ delete v; return false; } n = RandomRange(n); // Choose one of them. for (const RoadVehicle *u : RoadVehicle::Iterate()) { /* Find (n+1)-th road vehicle. */ if (u->IsFrontEngine() && (n-- == 0)) { /* Target it. */ v->dest_tile = u->index; v->age = 0; break; } } return true; } else { /* Target a vehicle */ RoadVehicle *u = RoadVehicle::Get(v->dest_tile.base()); assert(u != nullptr && u->type == VEH_ROAD && u->IsFrontEngine()); uint dist = Delta(v->x_pos, u->x_pos) + Delta(v->y_pos, u->y_pos); if (dist < TILE_SIZE && !(u->vehstatus & VS_HIDDEN) && u->breakdown_ctr == 0) { u->breakdown_ctr = 3; u->breakdown_delay = 140; } v->direction = GetDirectionTowards(v, u->x_pos, u->y_pos); GetNewVehiclePosResult gp = GetNewVehiclePos(v); int z = v->z_pos; if (dist <= TILE_SIZE && z > u->z_pos) z--; v->UpdatePosition(gp.x, gp.y, z); if (z <= u->z_pos && (u->vehstatus & VS_HIDDEN) == 0) { v->age++; if (u->crashed_ctr == 0) { u->Crash(); AddTileNewsItem(STR_NEWS_DISASTER_SMALL_UFO, NT_ACCIDENT, u->tile); AI::NewEvent(u->owner, new ScriptEventVehicleCrashed(u->index, u->tile, ScriptEventVehicleCrashed::CRASH_RV_UFO)); Game::NewEvent(new ScriptEventVehicleCrashed(u->index, u->tile, ScriptEventVehicleCrashed::CRASH_RV_UFO)); } } /* Destroy? */ if (v->age > 50) { CreateEffectVehicleRel(v, 0, 7, 8, EV_EXPLOSION_LARGE); if (_settings_client.sound.disaster) SndPlayVehicleFx(SND_12_EXPLOSION, v); delete v; return false; } } return true; } static void DestructIndustry(Industry *i) { for (TileIndex tile = 0; tile != Map::Size(); tile++) { if (i->TileBelongsToIndustry(tile)) { ResetIndustryConstructionStage(tile); MarkTileDirtyByTile(tile); } } } /** * Aircraft handling, v->state states: * 0: Fly towards the targeted industry * 1: If within 15 tiles, fire away rockets and destroy industry * 2: Industry explosions * 3: Fly out of the map * If the industry was removed in the meantime just fly to the end of the map. * @param v The disaster vehicle. * @param image_override The image at the time the aircraft is firing. * @param leave_at_top True iff the vehicle leaves the map at the north side. * @param news_message The string that's used as news message. * @param industry_flag Only attack industries that have this flag set. */ static bool DisasterTick_Aircraft(DisasterVehicle *v, uint16_t image_override, bool leave_at_top, StringID news_message, IndustryBehaviour industry_flag) { v->tick_counter++; v->image_override = (v->state == 1 && HasBit(v->tick_counter, 2)) ? image_override : 0; GetNewVehiclePosResult gp = GetNewVehiclePos(v); v->UpdatePosition(gp.x, gp.y, GetAircraftFlightLevel(v)); if ((leave_at_top && gp.x < (-10 * (int)TILE_SIZE)) || (!leave_at_top && gp.x > (int)(Map::SizeX() * TILE_SIZE + 9 * TILE_SIZE) - 1)) { delete v; return false; } if (v->state == 2) { if (GB(v->tick_counter, 0, 2) == 0) { Industry *i = Industry::Get(v->dest_tile.base()); // Industry destructor calls ReleaseDisastersTargetingIndustry, so this is valid int x = TileX(i->location.tile) * TILE_SIZE; int y = TileY(i->location.tile) * TILE_SIZE; uint32_t r = Random(); CreateEffectVehicleAbove( GB(r, 0, 6) + x, GB(r, 6, 6) + y, GB(r, 12, 4), EV_EXPLOSION_SMALL); if (++v->age >= 55) v->state = 3; } } else if (v->state == 1) { if (++v->age == 112) { v->state = 2; v->age = 0; Industry *i = Industry::Get(v->dest_tile.base()); // Industry destructor calls ReleaseDisastersTargetingIndustry, so this is valid DestructIndustry(i); SetDParam(0, i->town->index); AddIndustryNewsItem(news_message, NT_ACCIDENT, i->index); if (_settings_client.sound.disaster) SndPlayTileFx(SND_12_EXPLOSION, i->location.tile); } } else if (v->state == 0) { int x = v->x_pos + ((leave_at_top ? -15 : 15) * TILE_SIZE); int y = v->y_pos; if ((uint)x > Map::MaxX() * TILE_SIZE - 1) return true; TileIndex tile = TileVirtXY(x, y); if (!IsTileType(tile, MP_INDUSTRY)) return true; IndustryID ind = GetIndustryIndex(tile); v->dest_tile = ind; if (GetIndustrySpec(Industry::Get(ind)->type)->behaviour & industry_flag) { v->state = 1; v->age = 0; } } return true; } /** Airplane handling. */ static bool DisasterTick_Airplane(DisasterVehicle *v) { return DisasterTick_Aircraft(v, SPR_F_15_FIRING, true, STR_NEWS_DISASTER_AIRPLANE_OIL_REFINERY, INDUSTRYBEH_AIRPLANE_ATTACKS); } /** Helicopter handling. */ static bool DisasterTick_Helicopter(DisasterVehicle *v) { return DisasterTick_Aircraft(v, SPR_AH_64A_FIRING, false, STR_NEWS_DISASTER_HELICOPTER_FACTORY, INDUSTRYBEH_CHOPPER_ATTACKS); } /** Helicopter rotor blades; keep these spinning */ static bool DisasterTick_Helicopter_Rotors(DisasterVehicle *v) { v->tick_counter++; if (HasBit(v->tick_counter, 0)) return true; SpriteID &cur_image = v->sprite_cache.sprite_seq.seq[0].sprite; if (++cur_image > SPR_ROTOR_MOVING_3) cur_image = SPR_ROTOR_MOVING_1; v->UpdatePositionAndViewport(); return true; } /** * (Big) Ufo handling, v->state states: * 0: Fly around to the middle of the map, then randomly for a while and home in on a piece of rail * 1: Land there and breakdown all trains in a radius of 12 tiles; and now we wait... * because as soon as the Ufo lands, a fighter jet, a Skyranger, is called to clear up the mess */ static bool DisasterTick_Big_Ufo(DisasterVehicle *v) { v->tick_counter++; if (v->state == 1) { int x = TileX(v->dest_tile) * TILE_SIZE + TILE_SIZE / 2; int y = TileY(v->dest_tile) * TILE_SIZE + TILE_SIZE / 2; if (Delta(v->x_pos, x) + Delta(v->y_pos, y) >= 8) { v->direction = GetDirectionTowards(v, x, y); GetNewVehiclePosResult gp = GetNewVehiclePos(v); v->UpdatePosition(gp.x, gp.y, GetAircraftFlightLevel(v)); return true; } if (!IsValidTile(v->dest_tile)) { /* Make sure we don't land outside the map. */ delete v; return false; } int z = GetSlopePixelZ(v->x_pos, v->y_pos); if (z < v->z_pos) { v->UpdatePosition(v->x_pos, v->y_pos, v->z_pos - 1); return true; } v->state = 2; for (Vehicle *target : Vehicle::Iterate()) { if (target->IsGroundVehicle()) { if (Delta(target->x_pos, v->x_pos) + Delta(target->y_pos, v->y_pos) <= 12 * (int)TILE_SIZE) { target->breakdown_ctr = 5; target->breakdown_delay = 0xF0; } } } Town *t = ClosestTownFromTile(v->dest_tile, UINT_MAX); SetDParam(0, t->index); AddTileNewsItem(STR_NEWS_DISASTER_BIG_UFO, NT_ACCIDENT, v->tile); if (!Vehicle::CanAllocateItem(2)) { delete v; return false; } DisasterVehicle *u = new DisasterVehicle(-6 * (int)TILE_SIZE, v->y_pos, DIR_SW, ST_BIG_UFO_DESTROYER, v->index); DisasterVehicle *w = new DisasterVehicle(-6 * (int)TILE_SIZE, v->y_pos, DIR_SW, ST_BIG_UFO_DESTROYER_SHADOW); u->SetNext(w); } else if (v->state == 0) { int x = TileX(v->dest_tile) * TILE_SIZE; int y = TileY(v->dest_tile) * TILE_SIZE; if (Delta(x, v->x_pos) + Delta(y, v->y_pos) >= (int)TILE_SIZE) { v->direction = GetDirectionTowards(v, x, y); GetNewVehiclePosResult gp = GetNewVehiclePos(v); v->UpdatePosition(gp.x, gp.y, GetAircraftFlightLevel(v)); return true; } if (++v->age < 6) { v->dest_tile = RandomTile(); return true; } v->state = 1; const auto is_valid_target = [](const Train *t) { return t->IsFrontEngine() // Only the engines && Company::IsHumanID(t->owner) // Don't break AIs && IsPlainRailTile(t->tile) // No tunnels && (t->vehstatus & VS_CRASHED) == 0; // Not crashed }; uint n = 0; // Total number of targetable trains. for (const Train *t : Train::Iterate()) { if (is_valid_target(t)) n++; } if (n == 0) { /* If there are no targetable trains, destroy the UFO. */ delete v; return false; } n = RandomRange(n); // Choose one of them. for (const Train *t : Train::Iterate()) { /* Find (n+1)-th train. */ if (is_valid_target(t) && (n-- == 0)) { /* Target it. */ v->dest_tile = t->tile; v->age = 0; break; } } } return true; } /** * Skyranger destroying (Big) Ufo handling, v->state states: * 0: Home in on landed Ufo and shoot it down */ static bool DisasterTick_Big_Ufo_Destroyer(DisasterVehicle *v) { v->tick_counter++; GetNewVehiclePosResult gp = GetNewVehiclePos(v); v->UpdatePosition(gp.x, gp.y, GetAircraftFlightLevel(v)); if (gp.x > (int)(Map::SizeX() * TILE_SIZE + 9 * TILE_SIZE) - 1) { delete v; return false; } if (v->state == 0) { Vehicle *u = Vehicle::Get(v->big_ufo_destroyer_target); if (Delta(v->x_pos, u->x_pos) > (int)TILE_SIZE) return true; v->state = 1; CreateEffectVehicleRel(u, 0, 7, 8, EV_EXPLOSION_LARGE); if (_settings_client.sound.disaster) SndPlayVehicleFx(SND_12_EXPLOSION, u); delete u; for (int i = 0; i != 80; i++) { uint32_t r = Random(); CreateEffectVehicleAbove( GB(r, 0, 6) + v->x_pos - 32, GB(r, 5, 6) + v->y_pos - 32, 0, EV_EXPLOSION_SMALL); } for (int dy = -3; dy < 3; dy++) { for (int dx = -3; dx < 3; dx++) { TileIndex tile = TileAddWrap(v->tile, dx, dy); if (tile != INVALID_TILE) DisasterClearSquare(tile); } } } return true; } /** * Submarine, v->state states: * Unused, just float around aimlessly and pop up at different places, turning around */ static bool DisasterTick_Submarine(DisasterVehicle *v) { v->tick_counter++; if (++v->age > 8880) { delete v; return false; } if (!HasBit(v->tick_counter, 0)) return true; TileIndex tile = v->tile + TileOffsByDiagDir(DirToDiagDir(v->direction)); if (IsValidTile(tile)) { TrackBits trackbits = TrackStatusToTrackBits(GetTileTrackStatus(tile, TRANSPORT_WATER, 0)); if (trackbits == TRACK_BIT_ALL && !Chance16(1, 90)) { GetNewVehiclePosResult gp = GetNewVehiclePos(v); v->UpdatePosition(gp.x, gp.y, v->z_pos); return true; } } v->direction = ChangeDir(v->direction, GB(Random(), 0, 1) ? DIRDIFF_90RIGHT : DIRDIFF_90LEFT); return true; } static bool DisasterTick_NULL(DisasterVehicle *) { return true; } typedef bool DisasterVehicleTickProc(DisasterVehicle *v); static DisasterVehicleTickProc * const _disastervehicle_tick_procs[] = { DisasterTick_Zeppeliner, DisasterTick_NULL, DisasterTick_Ufo, DisasterTick_NULL, DisasterTick_Airplane, DisasterTick_NULL, DisasterTick_Helicopter, DisasterTick_NULL, DisasterTick_Helicopter_Rotors, DisasterTick_Big_Ufo, DisasterTick_NULL, DisasterTick_Big_Ufo_Destroyer, DisasterTick_NULL, DisasterTick_Submarine, DisasterTick_Submarine, }; bool DisasterVehicle::Tick() { return _disastervehicle_tick_procs[this->subtype](this); } typedef void DisasterInitProc(); /** * Zeppeliner which crashes on a small airport if one found, * otherwise crashes on a random tile */ static void Disaster_Zeppeliner_Init() { if (!Vehicle::CanAllocateItem(2)) return; /* Pick a random place, unless we find a small airport */ int x = TileX(Random()) * TILE_SIZE + TILE_SIZE / 2; for (const Station *st : Station::Iterate()) { if (st->airport.tile != INVALID_TILE && (st->airport.type == AT_SMALL || st->airport.type == AT_LARGE)) { x = (TileX(st->airport.tile) + 2) * TILE_SIZE; break; } } DisasterVehicle *v = new DisasterVehicle(x, 0, DIR_SE, ST_ZEPPELINER); /* Allocate shadow */ DisasterVehicle *u = new DisasterVehicle(x, 0, DIR_SE, ST_ZEPPELINER_SHADOW); v->SetNext(u); } /** * Ufo which flies around aimlessly from the middle of the map a bit * until it locates a road vehicle which it targets and then destroys */ static void Disaster_Small_Ufo_Init() { if (!Vehicle::CanAllocateItem(2)) return; int x = TileX(Random()) * TILE_SIZE + TILE_SIZE / 2; DisasterVehicle *v = new DisasterVehicle(x, 0, DIR_SE, ST_SMALL_UFO); v->dest_tile = TileXY(Map::SizeX() / 2, Map::SizeY() / 2); /* Allocate shadow */ DisasterVehicle *u = new DisasterVehicle(x, 0, DIR_SE, ST_SMALL_UFO_SHADOW); v->SetNext(u); } /* Combat airplane which destroys an oil refinery */ static void Disaster_Airplane_Init() { if (!Vehicle::CanAllocateItem(2)) return; Industry *found = nullptr; for (Industry *i : Industry::Iterate()) { if ((GetIndustrySpec(i->type)->behaviour & INDUSTRYBEH_AIRPLANE_ATTACKS) && (found == nullptr || Chance16(1, 2))) { found = i; } } if (found == nullptr) return; /* Start from the bottom (south side) of the map */ int x = (Map::SizeX() + 9) * TILE_SIZE - 1; int y = TileY(found->location.tile) * TILE_SIZE + 37; DisasterVehicle *v = new DisasterVehicle(x, y, DIR_NE, ST_AIRPLANE); DisasterVehicle *u = new DisasterVehicle(x, y, DIR_NE, ST_AIRPLANE_SHADOW); v->SetNext(u); } /** Combat helicopter that destroys a factory */ static void Disaster_Helicopter_Init() { if (!Vehicle::CanAllocateItem(3)) return; Industry *found = nullptr; for (Industry *i : Industry::Iterate()) { if ((GetIndustrySpec(i->type)->behaviour & INDUSTRYBEH_CHOPPER_ATTACKS) && (found == nullptr || Chance16(1, 2))) { found = i; } } if (found == nullptr) return; int x = -16 * (int)TILE_SIZE; int y = TileY(found->location.tile) * TILE_SIZE + 37; DisasterVehicle *v = new DisasterVehicle(x, y, DIR_SW, ST_HELICOPTER); DisasterVehicle *u = new DisasterVehicle(x, y, DIR_SW, ST_HELICOPTER_SHADOW); v->SetNext(u); DisasterVehicle *w = new DisasterVehicle(x, y, DIR_SW, ST_HELICOPTER_ROTORS); u->SetNext(w); } /* Big Ufo which lands on a piece of rail and will consequently be shot * down by a combat airplane, destroying the surroundings */ static void Disaster_Big_Ufo_Init() { if (!Vehicle::CanAllocateItem(2)) return; int x = TileX(Random()) * TILE_SIZE + TILE_SIZE / 2; int y = Map::MaxX() * TILE_SIZE - 1; DisasterVehicle *v = new DisasterVehicle(x, y, DIR_NW, ST_BIG_UFO); v->dest_tile = TileXY(Map::SizeX() / 2, Map::SizeY() / 2); /* Allocate shadow */ DisasterVehicle *u = new DisasterVehicle(x, y, DIR_NW, ST_BIG_UFO_SHADOW); v->SetNext(u); } static void Disaster_Submarine_Init(DisasterSubType subtype) { if (!Vehicle::CanAllocateItem()) return; int y; Direction dir; uint32_t r = Random(); int x = TileX(r) * TILE_SIZE + TILE_SIZE / 2; if (HasBit(r, 31)) { y = Map::MaxY() * TILE_SIZE - TILE_SIZE / 2 - 1; dir = DIR_NW; } else { y = TILE_SIZE / 2; if (_settings_game.construction.freeform_edges) y += TILE_SIZE; dir = DIR_SE; } if (!IsWaterTile(TileVirtXY(x, y))) return; new DisasterVehicle(x, y, dir, subtype); } /* Curious submarine #1, just floats around */ static void Disaster_Small_Submarine_Init() { Disaster_Submarine_Init(ST_SMALL_SUBMARINE); } /* Curious submarine #2, just floats around */ static void Disaster_Big_Submarine_Init() { Disaster_Submarine_Init(ST_BIG_SUBMARINE); } /** * Coal mine catastrophe, destroys a stretch of 30 tiles of * land in a certain direction */ static void Disaster_CoalMine_Init() { int index = GB(Random(), 0, 4); uint m; for (m = 0; m < 15; m++) { for (const Industry *i : Industry::Iterate()) { if ((GetIndustrySpec(i->type)->behaviour & INDUSTRYBEH_CAN_SUBSIDENCE) && --index < 0) { SetDParam(0, i->town->index); AddTileNewsItem(STR_NEWS_DISASTER_COAL_MINE_SUBSIDENCE, NT_ACCIDENT, i->location.tile + TileDiffXY(1, 1)); // keep the news, even when the mine closes { TileIndex tile = i->location.tile; TileIndexDiff step = TileOffsByDiagDir((DiagDirection)GB(Random(), 0, 2)); for (uint n = 0; n < 30; n++) { DisasterClearSquare(tile); tile += step; if (!IsValidTile(tile)) break; } } return; } } } } struct Disaster { DisasterInitProc *init_proc; ///< The init function for this disaster. TimerGameCalendar::Year min_year; ///< The first year this disaster will occur. TimerGameCalendar::Year max_year; ///< The last year this disaster will occur. }; static const Disaster _disasters[] = { {Disaster_Zeppeliner_Init, 1930, 1955}, // zeppeliner {Disaster_Small_Ufo_Init, 1940, 1970}, // ufo (small) {Disaster_Airplane_Init, 1960, 1990}, // airplane {Disaster_Helicopter_Init, 1970, 2000}, // helicopter {Disaster_Big_Ufo_Init, 2000, 2100}, // ufo (big) {Disaster_Small_Submarine_Init, 1940, 1965}, // submarine (small) {Disaster_Big_Submarine_Init, 1975, 2010}, // submarine (big) {Disaster_CoalMine_Init, 1950, 1985}, // coalmine }; static void DoDisaster() { byte buf[lengthof(_disasters)]; byte j = 0; for (size_t i = 0; i != lengthof(_disasters); i++) { if (TimerGameCalendar::year >= _disasters[i].min_year && TimerGameCalendar::year < _disasters[i].max_year) buf[j++] = (byte)i; } if (j == 0) return; _disasters[buf[RandomRange(j)]].init_proc(); } static void ResetDisasterDelay() { _disaster_delay = GB(Random(), 0, 9) + 730; } static IntervalTimer _disaster_daily({TimerGameCalendar::DAY, TimerGameCalendar::Priority::DISASTER}, [](auto) { if (--_disaster_delay != 0) return; ResetDisasterDelay(); if (_settings_game.difficulty.disasters != 0) DoDisaster(); }); void StartupDisasters() { ResetDisasterDelay(); } /** * Marks all disasters targeting this industry in such a way * they won't call Industry::Get(v->dest_tile) on invalid industry anymore. * @param i deleted industry */ void ReleaseDisastersTargetingIndustry(IndustryID i) { for (DisasterVehicle *v : DisasterVehicle::Iterate()) { /* primary disaster vehicles that have chosen target */ if (v->subtype == ST_AIRPLANE || v->subtype == ST_HELICOPTER) { /* if it has chosen target, and it is this industry (yes, dest_tile is IndustryID here), set order to "leaving map peacefully" */ if (v->state > 0 && v->dest_tile == (uint32_t)i) v->state = 3; } } } /** * Notify disasters that we are about to delete a vehicle. So make them head elsewhere. * @param vehicle deleted vehicle */ void ReleaseDisastersTargetingVehicle(VehicleID vehicle) { for (DisasterVehicle *v : DisasterVehicle::Iterate()) { /* primary disaster vehicles that have chosen target */ if (v->subtype == ST_SMALL_UFO) { if (v->state != 0 && v->dest_tile == vehicle) { /* Revert to target-searching */ v->state = 0; v->dest_tile = RandomTile(); GetAircraftFlightLevelBounds(v, &v->z_pos, nullptr); v->age = 0; } } } } void DisasterVehicle::UpdateDeltaXY() { this->x_offs = -1; this->y_offs = -1; this->x_extent = 2; this->y_extent = 2; this->z_extent = 5; }