Files @ r28520:f9aebe299cae
Branch filter:

Location: cpp/openttd-patchpack/source/src/station.cpp

Patric Stout
Codechange: MacOS already has MIN/MAX macros defined

This is caused because we use PreCompile Headers, and one of them
includes a system headers which defines MIN/MAX.
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
/*
 * 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 <http://www.gnu.org/licenses/>.
 */

/** @file station.cpp Implementation of the station base class. */

#include "stdafx.h"
#include "company_func.h"
#include "company_base.h"
#include "roadveh.h"
#include "viewport_func.h"
#include "viewport_kdtree.h"
#include "command_func.h"
#include "news_func.h"
#include "aircraft.h"
#include "vehiclelist.h"
#include "core/pool_func.hpp"
#include "station_base.h"
#include "station_kdtree.h"
#include "roadstop_base.h"
#include "industry.h"
#include "town.h"
#include "core/random_func.hpp"
#include "linkgraph/linkgraph.h"
#include "linkgraph/linkgraphschedule.h"

#include "table/strings.h"

#include "safeguards.h"

/** The pool of stations. */
StationPool _station_pool("Station");
INSTANTIATE_POOL_METHODS(Station)


StationKdtree _station_kdtree(Kdtree_StationXYFunc);

void RebuildStationKdtree()
{
	std::vector<StationID> stids;
	for (const Station *st : Station::Iterate()) {
		stids.push_back(st->index);
	}
	_station_kdtree.Build(stids.begin(), stids.end());
}


BaseStation::~BaseStation()
{
	if (CleaningPool()) return;

	CloseWindowById(WC_TRAINS_LIST,   VehicleListIdentifier(VL_STATION_LIST, VEH_TRAIN,    this->owner, this->index).Pack());
	CloseWindowById(WC_ROADVEH_LIST,  VehicleListIdentifier(VL_STATION_LIST, VEH_ROAD,     this->owner, this->index).Pack());
	CloseWindowById(WC_SHIPS_LIST,    VehicleListIdentifier(VL_STATION_LIST, VEH_SHIP,     this->owner, this->index).Pack());
	CloseWindowById(WC_AIRCRAFT_LIST, VehicleListIdentifier(VL_STATION_LIST, VEH_AIRCRAFT, this->owner, this->index).Pack());

	this->sign.MarkDirty();
}

Station::Station(TileIndex tile) :
	SpecializedStation<Station, false>(tile),
	bus_station(INVALID_TILE, 0, 0),
	truck_station(INVALID_TILE, 0, 0),
	ship_station(INVALID_TILE, 0, 0),
	indtype(IT_INVALID),
	time_since_load(255),
	time_since_unload(255),
	last_vehicle_type(VEH_INVALID)
{
	/* this->random_bits is set in Station::AddFacility() */
}

/**
 * Clean up a station by clearing vehicle orders, invalidating windows and
 * removing link stats.
 * Aircraft-Hangar orders need special treatment here, as the hangars are
 * actually part of a station (tiletype is STATION), but the order type
 * is OT_GOTO_DEPOT.
 */
Station::~Station()
{
	if (CleaningPool()) {
		for (GoodsEntry &ge : this->goods) {
			ge.cargo.OnCleanPool();
		}
		return;
	}

	while (!this->loading_vehicles.empty()) {
		this->loading_vehicles.front()->LeaveStation();
	}

	for (Aircraft *a : Aircraft::Iterate()) {
		if (!a->IsNormalAircraft()) continue;
		if (a->targetairport == this->index) a->targetairport = INVALID_STATION;
	}

	for (CargoID c = 0; c < NUM_CARGO; ++c) {
		LinkGraph *lg = LinkGraph::GetIfValid(this->goods[c].link_graph);
		if (lg == nullptr) continue;

		for (NodeID node = 0; node < lg->Size(); ++node) {
			Station *st = Station::Get((*lg)[node].station);
			st->goods[c].flows.erase(this->index);
			if ((*lg)[node].HasEdgeTo(this->goods[c].node) && (*lg)[node][this->goods[c].node].LastUpdate() != CalendarTime::INVALID_DATE) {
				st->goods[c].flows.DeleteFlows(this->index);
				RerouteCargo(st, c, this->index, st->index);
			}
		}
		lg->RemoveNode(this->goods[c].node);
		if (lg->Size() == 0) {
			LinkGraphSchedule::instance.Unqueue(lg);
			delete lg;
		}
	}

	for (Vehicle *v : Vehicle::Iterate()) {
		/* Forget about this station if this station is removed */
		if (v->last_station_visited == this->index) {
			v->last_station_visited = INVALID_STATION;
		}
		if (v->last_loading_station == this->index) {
			v->last_loading_station = INVALID_STATION;
		}
	}

	/* Remove station from industries and towns that reference it. */
	this->RemoveFromAllNearbyLists();

	/* Clear the persistent storage. */
	delete this->airport.psa;

	if (this->owner == OWNER_NONE) {
		/* Invalidate all in case of oil rigs. */
		InvalidateWindowClassesData(WC_STATION_LIST, 0);
	} else {
		InvalidateWindowData(WC_STATION_LIST, this->owner, 0);
	}

	CloseWindowById(WC_STATION_VIEW, index);

	/* Now delete all orders that go to the station */
	RemoveOrderFromAllVehicles(OT_GOTO_STATION, this->index);

	/* Remove all news items */
	DeleteStationNews(this->index);

	for (GoodsEntry &ge : this->goods) {
		ge.cargo.Truncate();
	}

	CargoPacket::InvalidateAllFrom(this->index);

	_station_kdtree.Remove(this->index);
	if (this->sign.kdtree_valid) _viewport_sign_kdtree.Remove(ViewportSignKdtreeItem::MakeStation(this->index));
}


/**
 * Invalidating of the JoinStation window has to be done
 * after removing item from the pool.
 */
void BaseStation::PostDestructor(size_t)
{
	InvalidateWindowData(WC_SELECT_STATION, 0, 0);
}

void BaseStation::SetRoadStopTileData(TileIndex tile, byte data, bool animation)
{
	for (RoadStopTileData &tile_data : this->custom_roadstop_tile_data) {
		if (tile_data.tile == tile) {
			if (animation) {
				tile_data.animation_frame = data;
			} else {
				tile_data.random_bits = data;
			}
			return;
		}
	}
	RoadStopTileData tile_data;
	tile_data.tile = tile;
	tile_data.animation_frame = animation ? data : 0;
	tile_data.random_bits = animation ? 0 : data;
	this->custom_roadstop_tile_data.push_back(tile_data);
}

void BaseStation::RemoveRoadStopTileData(TileIndex tile)
{
	for (RoadStopTileData &tile_data : this->custom_roadstop_tile_data) {
		if (tile_data.tile == tile) {
			tile_data = this->custom_roadstop_tile_data.back();
			this->custom_roadstop_tile_data.pop_back();
			return;
		}
	}
}

/**
 * Get the primary road stop (the first road stop) that the given vehicle can load/unload.
 * @param v the vehicle to get the first road stop for
 * @return the first roadstop that this vehicle can load at
 */
RoadStop *Station::GetPrimaryRoadStop(const RoadVehicle *v) const
{
	RoadStop *rs = this->GetPrimaryRoadStop(v->IsBus() ? ROADSTOP_BUS : ROADSTOP_TRUCK);

	for (; rs != nullptr; rs = rs->next) {
		/* The vehicle cannot go to this roadstop (different roadtype) */
		if (!HasTileAnyRoadType(rs->xy, v->compatible_roadtypes)) continue;
		/* The vehicle is articulated and can therefore not go to a standard road stop. */
		if (IsBayRoadStopTile(rs->xy) && v->HasArticulatedPart()) continue;

		/* The vehicle can actually go to this road stop. So, return it! */
		break;
	}

	return rs;
}

/**
 * Called when new facility is built on the station. If it is the first facility
 * it initializes also 'xy' and 'random_bits' members
 */
void Station::AddFacility(StationFacility new_facility_bit, TileIndex facil_xy)
{
	if (this->facilities == FACIL_NONE) {
		this->MoveSign(facil_xy);
		this->random_bits = Random();
	}
	this->facilities |= new_facility_bit;
	this->owner = _current_company;
	this->build_date = TimerGameCalendar::date;
}

/**
 * Marks the tiles of the station as dirty.
 *
 * @ingroup dirty
 */
void Station::MarkTilesDirty(bool cargo_change) const
{
	TileIndex tile = this->train_station.tile;
	int w, h;

	if (tile == INVALID_TILE) return;

	/* cargo_change is set if we're refreshing the tiles due to cargo moving
	 * around. */
	if (cargo_change) {
		/* Don't waste time updating if there are no custom station graphics
		 * that might change. Even if there are custom graphics, they might
		 * not change. Unfortunately we have no way of telling. */
		if (this->speclist.empty()) return;
	}

	for (h = 0; h < train_station.h; h++) {
		for (w = 0; w < train_station.w; w++) {
			if (this->TileBelongsToRailStation(tile)) {
				MarkTileDirtyByTile(tile);
			}
			tile += TileDiffXY(1, 0);
		}
		tile += TileDiffXY(-w, 1);
	}
}

/* virtual */ uint Station::GetPlatformLength(TileIndex tile) const
{
	assert(this->TileBelongsToRailStation(tile));

	TileIndexDiff delta = (GetRailStationAxis(tile) == AXIS_X ? TileDiffXY(1, 0) : TileDiffXY(0, 1));

	TileIndex t = tile;
	uint len = 0;
	do {
		t -= delta;
		len++;
	} while (IsCompatibleTrainStationTile(t, tile));

	t = tile;
	do {
		t += delta;
		len++;
	} while (IsCompatibleTrainStationTile(t, tile));

	return len - 1;
}

/* virtual */ uint Station::GetPlatformLength(TileIndex tile, DiagDirection dir) const
{
	TileIndex start_tile = tile;
	uint length = 0;
	assert(IsRailStationTile(tile));
	assert(dir < DIAGDIR_END);

	do {
		length++;
		tile += TileOffsByDiagDir(dir);
	} while (IsCompatibleTrainStationTile(tile, start_tile));

	return length;
}

/**
 * Get the catchment size of an individual station tile.
 * @param tile Station tile to get catchment size of.
 * @param st Associated station of station tile.
 * @pre IsTileType(tile, MP_STATION)
 * @return The catchment size of the station tile.
 */
static uint GetTileCatchmentRadius(TileIndex tile, const Station *st)
{
	assert(IsTileType(tile, MP_STATION));

	if (_settings_game.station.modified_catchment) {
		switch (GetStationType(tile)) {
			case STATION_RAIL:    return CA_TRAIN;
			case STATION_OILRIG:  return CA_UNMODIFIED;
			case STATION_AIRPORT: return st->airport.GetSpec()->catchment;
			case STATION_TRUCK:   return CA_TRUCK;
			case STATION_BUS:     return CA_BUS;
			case STATION_DOCK:    return CA_DOCK;

			default: NOT_REACHED();
			case STATION_BUOY:
			case STATION_WAYPOINT: return CA_NONE;
		}
	} else {
		switch (GetStationType(tile)) {
			default:               return CA_UNMODIFIED;
			case STATION_BUOY:
			case STATION_WAYPOINT: return CA_NONE;
		}
	}
}

/**
 * Determines the catchment radius of the station
 * @return The radius
 */
uint Station::GetCatchmentRadius() const
{
	uint ret = CA_NONE;

	if (_settings_game.station.modified_catchment) {
		if (this->bus_stops          != nullptr)      ret = std::max<uint>(ret, CA_BUS);
		if (this->truck_stops        != nullptr)      ret = std::max<uint>(ret, CA_TRUCK);
		if (this->train_station.tile != INVALID_TILE) ret = std::max<uint>(ret, CA_TRAIN);
		if (this->ship_station.tile  != INVALID_TILE) ret = std::max<uint>(ret, CA_DOCK);
		if (this->airport.tile       != INVALID_TILE) ret = std::max<uint>(ret, this->airport.GetSpec()->catchment);
	} else {
		if (this->bus_stops != nullptr || this->truck_stops != nullptr || this->train_station.tile != INVALID_TILE || this->ship_station.tile != INVALID_TILE || this->airport.tile != INVALID_TILE) {
			ret = CA_UNMODIFIED;
		}
	}

	return ret;
}

/**
 * Determines catchment rectangle of this station
 * @return clamped catchment rectangle
 */
Rect Station::GetCatchmentRect() const
{
	assert(!this->rect.IsEmpty());

	/* Compute acceptance rectangle */
	int catchment_radius = this->GetCatchmentRadius();

	Rect ret = {
		std::max<int>(this->rect.left   - catchment_radius, 0),
		std::max<int>(this->rect.top    - catchment_radius, 0),
		std::min<int>(this->rect.right  + catchment_radius, Map::MaxX()),
		std::min<int>(this->rect.bottom + catchment_radius, Map::MaxY())
	};

	return ret;
}

/**
 * Add nearby industry to station's industries_near list if it accepts cargo.
 * For industries that are already on the list update distance if it's closer.
 * @param ind  Industry
 * @param tile Tile of the industry to measure distance to.
 */
void Station::AddIndustryToDeliver(Industry *ind, TileIndex tile)
{
	/* Using DistanceMax to get about the same order as with previously used CircularTileSearch. */
	uint distance = DistanceMax(this->xy, tile);

	/* Don't check further if this industry is already in the list but update the distance if it's closer */
	auto pos = std::find_if(this->industries_near.begin(), this->industries_near.end(), [&](const IndustryListEntry &e) { return e.industry->index == ind->index; });
	if (pos != this->industries_near.end()) {
		if (pos->distance > distance) {
			auto node = this->industries_near.extract(pos);
			node.value().distance = distance;
			this->industries_near.insert(std::move(node));
		}
		return;
	}

	/* Include only industries that can accept cargo */
	if (!ind->IsCargoAccepted()) return;

	this->industries_near.insert(IndustryListEntry{distance, ind});
}

/**
 * Remove nearby industry from station's industries_near list.
 * @param ind  Industry
 */
void Station::RemoveIndustryToDeliver(Industry *ind)
{
	auto pos = std::find_if(this->industries_near.begin(), this->industries_near.end(), [&](const IndustryListEntry &e) { return e.industry->index == ind->index; });
	if (pos != this->industries_near.end()) {
		this->industries_near.erase(pos);
	}
}


/**
 * Remove this station from the nearby stations lists of all towns and industries.
 */
void Station::RemoveFromAllNearbyLists()
{
	for (Town *t : Town::Iterate()) { t->stations_near.erase(this); }
	for (Industry *i : Industry::Iterate()) { i->stations_near.erase(this); }
}

/**
 * Test if the given town ID is covered by our catchment area.
 * This is used when removing a house tile to determine if it was the last house tile
 * within our catchment.
 * @param t TownID to test.
 * @return true if at least one house tile of TownID is covered.
 */
bool Station::CatchmentCoversTown(TownID t) const
{
	BitmapTileIterator it(this->catchment_tiles);
	for (TileIndex tile = it; tile != INVALID_TILE; tile = ++it) {
		if (IsTileType(tile, MP_HOUSE) && GetTownIndex(tile) == t) return true;
	}
	return false;
}

/**
 * Recompute tiles covered in our catchment area.
 * This will additionally recompute nearby towns and industries.
 * @param no_clear_nearby_lists If Station::RemoveFromAllNearbyLists does not need to be called.
 */
void Station::RecomputeCatchment(bool no_clear_nearby_lists)
{
	this->industries_near.clear();
	if (!no_clear_nearby_lists) this->RemoveFromAllNearbyLists();

	if (this->rect.IsEmpty()) {
		this->catchment_tiles.Reset();
		return;
	}

	if (!_settings_game.station.serve_neutral_industries && this->industry != nullptr) {
		/* Station is associated with an industry, so we only need to deliver to that industry. */
		this->catchment_tiles.Initialize(this->industry->location);
		for (TileIndex tile : this->industry->location) {
			if (IsTileType(tile, MP_INDUSTRY) && GetIndustryIndex(tile) == this->industry->index) {
				this->catchment_tiles.SetTile(tile);
			}
		}
		/* The industry's stations_near may have been computed before its neutral station was built so clear and re-add here. */
		for (Station *st : this->industry->stations_near) {
			st->RemoveIndustryToDeliver(this->industry);
		}
		this->industry->stations_near.clear();
		this->industry->stations_near.insert(this);
		this->industries_near.insert(IndustryListEntry{0, this->industry});
		return;
	}

	this->catchment_tiles.Initialize(GetCatchmentRect());

	/* Loop finding all station tiles */
	TileArea ta(TileXY(this->rect.left, this->rect.top), TileXY(this->rect.right, this->rect.bottom));
	for (TileIndex tile : ta) {
		if (!IsTileType(tile, MP_STATION) || GetStationIndex(tile) != this->index) continue;

		uint r = GetTileCatchmentRadius(tile, this);
		if (r == CA_NONE) continue;

		/* This tile sub-loop doesn't need to test any tiles, they are simply added to the catchment set. */
		TileArea ta2 = TileArea(tile, 1, 1).Expand(r);
		for (TileIndex tile2 : ta2) this->catchment_tiles.SetTile(tile2);
	}

	/* Search catchment tiles for towns and industries */
	BitmapTileIterator it(this->catchment_tiles);
	for (TileIndex tile = it; tile != INVALID_TILE; tile = ++it) {
		if (IsTileType(tile, MP_HOUSE)) {
			Town *t = Town::GetByTile(tile);
			t->stations_near.insert(this);
		}
		if (IsTileType(tile, MP_INDUSTRY)) {
			Industry *i = Industry::GetByTile(tile);

			/* Ignore industry if it has a neutral station. It already can't be this station. */
			if (!_settings_game.station.serve_neutral_industries && i->neutral_station != nullptr) continue;

			i->stations_near.insert(this);

			/* Add if we can deliver to this industry as well */
			this->AddIndustryToDeliver(i, tile);
		}
	}
}

/**
 * Recomputes catchment of all stations.
 * This will additionally recompute nearby stations for all towns and industries.
 */
/* static */ void Station::RecomputeCatchmentForAll()
{
	for (Town *t : Town::Iterate()) { t->stations_near.clear(); }
	for (Industry *i : Industry::Iterate()) { i->stations_near.clear(); }
	for (Station *st : Station::Iterate()) { st->RecomputeCatchment(true); }
}

/************************************************************************/
/*                     StationRect implementation                       */
/************************************************************************/

StationRect::StationRect()
{
	this->MakeEmpty();
}

void StationRect::MakeEmpty()
{
	this->left = this->top = this->right = this->bottom = 0;
}

/**
 * Determines whether a given point (x, y) is within a certain distance of
 * the station rectangle.
 * @note x and y are in Tile coordinates
 * @param x X coordinate
 * @param y Y coordinate
 * @param distance The maximum distance a point may have (L1 norm)
 * @return true if the point is within distance tiles of the station rectangle
 */
bool StationRect::PtInExtendedRect(int x, int y, int distance) const
{
	return this->left - distance <= x && x <= this->right + distance &&
			this->top - distance <= y && y <= this->bottom + distance;
}

bool StationRect::IsEmpty() const
{
	return this->left == 0 || this->left > this->right || this->top > this->bottom;
}

CommandCost StationRect::BeforeAddTile(TileIndex tile, StationRectMode mode)
{
	int x = TileX(tile);
	int y = TileY(tile);
	if (this->IsEmpty()) {
		/* we are adding the first station tile */
		if (mode != ADD_TEST) {
			this->left = this->right = x;
			this->top = this->bottom = y;
		}
	} else if (!this->PtInExtendedRect(x, y)) {
		/* current rect is not empty and new point is outside this rect
		 * make new spread-out rectangle */
		Rect new_rect = {std::min(x, this->left), std::min(y, this->top), std::max(x, this->right), std::max(y, this->bottom)};

		/* check new rect dimensions against preset max */
		int w = new_rect.Width();
		int h = new_rect.Height();
		if (mode != ADD_FORCE && (w > _settings_game.station.station_spread || h > _settings_game.station.station_spread)) {
			assert(mode != ADD_TRY);
			return_cmd_error(STR_ERROR_STATION_TOO_SPREAD_OUT);
		}

		/* spread-out ok, return true */
		if (mode != ADD_TEST) {
			/* we should update the station rect */
			*this = new_rect;
		}
	} else {
		; // new point is inside the rect, we don't need to do anything
	}
	return CommandCost();
}

CommandCost StationRect::BeforeAddRect(TileIndex tile, int w, int h, StationRectMode mode)
{
	if (mode == ADD_FORCE || (w <= _settings_game.station.station_spread && h <= _settings_game.station.station_spread)) {
		/* Important when the old rect is completely inside the new rect, resp. the old one was empty. */
		CommandCost ret = this->BeforeAddTile(tile, mode);
		if (ret.Succeeded()) ret = this->BeforeAddTile(TILE_ADDXY(tile, w - 1, h - 1), mode);
		return ret;
	}
	return CommandCost();
}

/**
 * Check whether station tiles of the given station id exist in the given rectangle
 * @param st_id    Station ID to look for in the rectangle
 * @param left_a   Minimal tile X edge of the rectangle
 * @param top_a    Minimal tile Y edge of the rectangle
 * @param right_a  Maximal tile X edge of the rectangle (inclusive)
 * @param bottom_a Maximal tile Y edge of the rectangle (inclusive)
 * @return \c true if a station tile with the given \a st_id exists in the rectangle, \c false otherwise
 */
/* static */ bool StationRect::ScanForStationTiles(StationID st_id, int left_a, int top_a, int right_a, int bottom_a)
{
	TileArea ta(TileXY(left_a, top_a), TileXY(right_a, bottom_a));
	for (TileIndex tile : ta) {
		if (IsTileType(tile, MP_STATION) && GetStationIndex(tile) == st_id) return true;
	}

	return false;
}

bool StationRect::AfterRemoveTile(BaseStation *st, TileIndex tile)
{
	int x = TileX(tile);
	int y = TileY(tile);

	/* look if removed tile was on the bounding rect edge
	 * and try to reduce the rect by this edge
	 * do it until we have empty rect or nothing to do */
	for (;;) {
		/* check if removed tile is on rect edge */
		bool left_edge = (x == this->left);
		bool right_edge = (x == this->right);
		bool top_edge = (y == this->top);
		bool bottom_edge = (y == this->bottom);

		/* can we reduce the rect in either direction? */
		bool reduce_x = ((left_edge || right_edge) && !ScanForStationTiles(st->index, x, this->top, x, this->bottom));
		bool reduce_y = ((top_edge || bottom_edge) && !ScanForStationTiles(st->index, this->left, y, this->right, y));
		if (!(reduce_x || reduce_y)) break; // nothing to do (can't reduce)

		if (reduce_x) {
			/* reduce horizontally */
			if (left_edge) {
				/* move left edge right */
				this->left = x = x + 1;
			} else {
				/* move right edge left */
				this->right = x = x - 1;
			}
		}
		if (reduce_y) {
			/* reduce vertically */
			if (top_edge) {
				/* move top edge down */
				this->top = y = y + 1;
			} else {
				/* move bottom edge up */
				this->bottom = y = y - 1;
			}
		}

		if (left > right || top > bottom) {
			/* can't continue, if the remaining rectangle is empty */
			this->MakeEmpty();
			return true; // empty remaining rect
		}
	}
	return false; // non-empty remaining rect
}

bool StationRect::AfterRemoveRect(BaseStation *st, TileArea ta)
{
	assert(this->PtInExtendedRect(TileX(ta.tile), TileY(ta.tile)));
	assert(this->PtInExtendedRect(TileX(ta.tile) + ta.w - 1, TileY(ta.tile) + ta.h - 1));

	bool empty = this->AfterRemoveTile(st, ta.tile);
	if (ta.w != 1 || ta.h != 1) empty = empty || this->AfterRemoveTile(st, TILE_ADDXY(ta.tile, ta.w - 1, ta.h - 1));
	return empty;
}

StationRect& StationRect::operator = (const Rect &src)
{
	this->left = src.left;
	this->top = src.top;
	this->right = src.right;
	this->bottom = src.bottom;
	return *this;
}

/**
 * Calculates the maintenance cost of all airports of a company.
 * @param owner Company.
 * @return Total cost.
 */
Money AirportMaintenanceCost(Owner owner)
{
	Money total_cost = 0;

	for (const Station *st : Station::Iterate()) {
		if (st->owner == owner && (st->facilities & FACIL_AIRPORT)) {
			total_cost += _price[PR_INFRASTRUCTURE_AIRPORT] * st->airport.GetSpec()->maintenance_cost;
		}
	}
	/* 3 bits fraction for the maintenance cost factor. */
	return total_cost >> 3;
}

bool StationCompare::operator() (const Station *lhs, const Station *rhs) const
{
	return lhs->index < rhs->index;
}