summaryrefslogtreecommitdiff
path: root/src/genworld_gui.cpp
blob: 697ce382d7769bc9e11d00bcd55505a7f68495a0 (plain)
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
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
/* $Id$ */

/*
 * 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 genworld_gui.cpp GUI to configure and show progress during map generation. */

#include "stdafx.h"
#include "heightmap.h"
#include "debug.h"
#include "genworld.h"
#include "network/network.h"
#include "strings_func.h"
#include "window_func.h"
#include "date_func.h"
#include "sound_func.h"
#include "fios.h"
#include "string_func.h"
#include "widgets/dropdown_type.h"
#include "widgets/dropdown_func.h"
#include "querystring_gui.h"
#include "town.h"
#include "core/geometry_func.hpp"
#include "core/random_func.hpp"
#include "saveload/saveload.h"
#include "progress.h"
#include "error.h"

#include "widgets/genworld_widget.h"

#include "safeguards.h"


extern void MakeNewgameSettingsLive();

/** Enum for the modes we can generate in. */
enum GenerateLandscapeWindowMode {
	GLWM_GENERATE,  ///< Generate new game.
	GLWM_HEIGHTMAP, ///< Load from heightmap.
	GLWM_SCENARIO,  ///< Generate flat land.
};

/**
 * Changes landscape type and sets genworld window dirty
 * @param landscape new landscape type
 */
void SetNewLandscapeType(byte landscape)
{
	_settings_newgame.game_creation.landscape = landscape;
	InvalidateWindowClassesData(WC_SELECT_GAME);
	InvalidateWindowClassesData(WC_GENERATE_LANDSCAPE);
}

/** Widgets of GenerateLandscapeWindow when generating world */
static const NWidgetPart _nested_generate_landscape_widgets[] = {
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_CLOSEBOX, COLOUR_BROWN),
		NWidget(WWT_CAPTION, COLOUR_BROWN), SetDataTip(STR_MAPGEN_WORLD_GENERATION_CAPTION, STR_NULL),
	EndContainer(),
	NWidget(WWT_PANEL, COLOUR_BROWN),
		NWidget(NWID_SPACER), SetMinimalSize(0, 10),
		/* Landscape selection. */
		NWidget(NWID_HORIZONTAL), SetPIP(10, 0, 10),
			NWidget(NWID_SPACER), SetFill(1, 0),
			NWidget(WWT_IMGBTN_2, COLOUR_ORANGE, WID_GL_TEMPERATE), SetDataTip(SPR_SELECT_TEMPERATE, STR_INTRO_TOOLTIP_TEMPERATE),
			NWidget(NWID_SPACER), SetFill(1, 0),
			NWidget(WWT_IMGBTN_2, COLOUR_ORANGE, WID_GL_ARCTIC), SetDataTip(SPR_SELECT_SUB_ARCTIC, STR_INTRO_TOOLTIP_SUB_ARCTIC_LANDSCAPE),
			NWidget(NWID_SPACER), SetFill(1, 0),
			NWidget(WWT_IMGBTN_2, COLOUR_ORANGE, WID_GL_TROPICAL), SetDataTip(SPR_SELECT_SUB_TROPICAL, STR_INTRO_TOOLTIP_SUB_TROPICAL_LANDSCAPE),
			NWidget(NWID_SPACER), SetFill(1, 0),
			NWidget(WWT_IMGBTN_2, COLOUR_ORANGE, WID_GL_TOYLAND), SetDataTip(SPR_SELECT_TOYLAND, STR_INTRO_TOOLTIP_TOYLAND_LANDSCAPE),
			NWidget(NWID_SPACER), SetFill(1, 0),
		EndContainer(),
		NWidget(NWID_SPACER), SetMinimalSize(0, 11),
		NWidget(NWID_HORIZONTAL), SetPIP(10, 5, 10),
			NWidget(NWID_HORIZONTAL), SetPIP(0, 3, 0),
				/* Left column with labels. */
				NWidget(NWID_VERTICAL, NC_EQUALSIZE), SetPIP(0, 4, 0),
					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_MAPSIZE, STR_MAPGEN_MAPSIZE_TOOLTIP), SetFill(1, 1),
					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_LAND_GENERATOR, STR_NULL), SetFill(1, 1),
					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_NUMBER_OF_TOWNS, STR_NULL), SetFill(1, 1),
					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_TERRAIN_TYPE, STR_NULL), SetFill(1, 1),
					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_VARIETY, STR_NULL), SetFill(1, 1),
					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_QUANTITY_OF_SEA_LAKES, STR_NULL), SetFill(1, 1),
					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_TREE_PLACER, STR_NULL), SetFill(1, 1),
					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_BORDER_TYPE, STR_NULL), SetFill(1, 1),
				EndContainer(),
				/* Widgets at the right of the labels. */
				NWidget(NWID_VERTICAL, NC_EQUALSIZE), SetPIP(0, 4, 0),
					/* Mapsize X * Y. */
					NWidget(NWID_HORIZONTAL), SetPIP(0, 4, 0),
						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_MAPSIZE_X_PULLDOWN), SetDataTip(STR_JUST_INT, STR_MAPGEN_MAPSIZE_TOOLTIP), SetFill(1, 0),
						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_BY, STR_NULL), SetPadding(1, 0, 0, 0), SetFill(1, 1),
						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_MAPSIZE_Y_PULLDOWN), SetDataTip(STR_JUST_INT, STR_MAPGEN_MAPSIZE_TOOLTIP), SetFill(1, 0),
					EndContainer(),
					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_LANDSCAPE_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_TOWN_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_TERRAIN_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_VARIETY_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_WATER_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_TREE_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
					NWidget(WWT_TEXTBTN, COLOUR_ORANGE, WID_GL_BORDERS_RANDOM), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
				EndContainer(),
			EndContainer(),
			NWidget(NWID_VERTICAL), SetPIP(0, 4, 0),
				NWidget(NWID_HORIZONTAL), SetPIP(0, 3, 0),
					NWidget(NWID_VERTICAL, NC_EQUALSIZE), SetPIP(0, 4, 0),
						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_MAX_HEIGHTLEVEL, STR_NULL), SetFill(1, 1),
						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_SNOW_LINE_HEIGHT, STR_NULL), SetFill(1, 1),
						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_DATE, STR_NULL), SetFill(1, 1),
						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_NUMBER_OF_INDUSTRIES, STR_NULL), SetFill(1, 1),
						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_SMOOTHNESS, STR_NULL), SetFill(1, 1),
						NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_QUANTITY_OF_RIVERS, STR_NULL), SetFill(1, 1),
					EndContainer(),
					NWidget(NWID_VERTICAL, NC_EQUALSIZE), SetPIP(0, 4, 0),
						/* Max. heightlevel. */
						NWidget(NWID_HORIZONTAL),
							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_MAX_HEIGHTLEVEL_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_MAPGEN_MAX_HEIGHTLEVEL_DOWN), SetFill(0, 1),
							NWidget(WWT_TEXTBTN, COLOUR_ORANGE, WID_GL_MAX_HEIGHTLEVEL_TEXT), SetDataTip(STR_BLACK_INT, STR_NULL), SetFill(1, 0),
							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_MAX_HEIGHTLEVEL_UP), SetDataTip(SPR_ARROW_UP, STR_MAPGEN_MAX_HEIGHTLEVEL_UP), SetFill(0, 1),
						EndContainer(),
						/* Snow line. */
						NWidget(NWID_HORIZONTAL),
							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_MAPGEN_SNOW_LINE_DOWN), SetFill(0, 1),
							NWidget(WWT_TEXTBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_TEXT), SetDataTip(STR_BLACK_INT, STR_NULL), SetFill(1, 0),
							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_UP), SetDataTip(SPR_ARROW_UP, STR_MAPGEN_SNOW_LINE_UP), SetFill(0, 1),
						EndContainer(),
						/* Starting date. */
						NWidget(NWID_HORIZONTAL),
							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_START_DATE_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_SCENEDIT_TOOLBAR_TOOLTIP_MOVE_THE_STARTING_DATE_BACKWARD), SetFill(0, 1),
							NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_GL_START_DATE_TEXT), SetDataTip(STR_BLACK_DATE_LONG, STR_NULL), SetFill(1, 0),
							NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_START_DATE_UP), SetDataTip(SPR_ARROW_UP, STR_SCENEDIT_TOOLBAR_TOOLTIP_MOVE_THE_STARTING_DATE_FORWARD), SetFill(0, 1),
						EndContainer(),
						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_INDUSTRY_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_SMOOTHNESS_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_RIVER_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
					EndContainer(),
				EndContainer(),
				NWidget(WWT_PUSHTXTBTN, COLOUR_GREEN, WID_GL_GENERATE_BUTTON), SetMinimalSize(84, 0), SetDataTip(STR_MAPGEN_GENERATE, STR_NULL), SetFill(1, 1),
			EndContainer(),
		EndContainer(),
		NWidget(NWID_SPACER), SetMinimalSize(0, 4),
		/* Map borders buttons for each edge. */
		NWidget(NWID_HORIZONTAL, NC_EQUALSIZE), SetPIP(10, 0, 10),
			NWidget(NWID_HORIZONTAL), SetPIP(0, 0, 3),
				NWidget(NWID_SPACER), SetFill(1, 1),
				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_NORTHWEST, STR_NULL), SetPadding(1, 0, 0, 0), SetFill(0, 1),
			EndContainer(),
			NWidget(WWT_TEXTBTN, COLOUR_ORANGE, WID_GL_WATER_NW), SetDataTip(STR_JUST_STRING, STR_MAPGEN_NORTHWEST), SetFill(1, 1),
			NWidget(WWT_TEXTBTN, COLOUR_ORANGE, WID_GL_WATER_NE), SetDataTip(STR_JUST_STRING, STR_MAPGEN_NORTHEAST), SetFill(1, 1),
			NWidget(NWID_HORIZONTAL), SetPIP(3, 0, 0),
				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_NORTHEAST, STR_NULL), SetPadding(1, 0, 0, 0), SetFill(0, 1),
				NWidget(NWID_SPACER), SetFill(1, 1),
			EndContainer(),
		EndContainer(),
		NWidget(NWID_HORIZONTAL, NC_EQUALSIZE), SetPIP(10, 0, 10),
			NWidget(NWID_HORIZONTAL), SetPIP(0, 0, 3),
				NWidget(NWID_SPACER), SetFill(1, 1),
				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_SOUTHWEST, STR_NULL), SetPadding(1, 0, 0, 0), SetFill(0, 1),
			EndContainer(),
			NWidget(WWT_TEXTBTN, COLOUR_ORANGE, WID_GL_WATER_SW), SetDataTip(STR_JUST_STRING, STR_MAPGEN_SOUTHWEST), SetFill(1, 1),
			NWidget(WWT_TEXTBTN, COLOUR_ORANGE, WID_GL_WATER_SE), SetDataTip(STR_JUST_STRING, STR_MAPGEN_SOUTHEAST), SetFill(1, 1),
			NWidget(NWID_HORIZONTAL), SetPIP(3, 0, 0),
				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_SOUTHEAST, STR_NULL), SetPadding(1, 0, 0, 0), SetFill(0, 1),
				NWidget(NWID_SPACER), SetFill(1, 1),
			EndContainer(),
		EndContainer(),
		NWidget(NWID_SPACER), SetMinimalSize(0, 9), SetFill(1, 1),
	EndContainer(),
};

/** Widgets of GenerateLandscapeWindow when loading heightmap */
static const NWidgetPart _nested_heightmap_load_widgets[] = {
	/* Window header. */
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_CLOSEBOX, COLOUR_BROWN),
		NWidget(WWT_CAPTION, COLOUR_BROWN), SetDataTip(STR_MAPGEN_WORLD_GENERATION_CAPTION, STR_NULL),
	EndContainer(),
	NWidget(WWT_PANEL, COLOUR_BROWN),
		NWidget(NWID_SPACER), SetMinimalSize(0, 10),
		/* Landscape selection. */
		NWidget(NWID_HORIZONTAL), SetPIP(10, 0, 10),
			NWidget(NWID_SPACER), SetFill(1, 0),
			NWidget(WWT_IMGBTN_2, COLOUR_ORANGE, WID_GL_TEMPERATE), SetDataTip(SPR_SELECT_TEMPERATE, STR_INTRO_TOOLTIP_TEMPERATE),
			NWidget(NWID_SPACER), SetFill(1, 0),
			NWidget(WWT_IMGBTN_2, COLOUR_ORANGE, WID_GL_ARCTIC), SetDataTip(SPR_SELECT_SUB_ARCTIC, STR_INTRO_TOOLTIP_SUB_ARCTIC_LANDSCAPE),
			NWidget(NWID_SPACER), SetFill(1, 0),
			NWidget(WWT_IMGBTN_2, COLOUR_ORANGE, WID_GL_TROPICAL), SetDataTip(SPR_SELECT_SUB_TROPICAL, STR_INTRO_TOOLTIP_SUB_TROPICAL_LANDSCAPE),
			NWidget(NWID_SPACER), SetFill(1, 0),
			NWidget(WWT_IMGBTN_2, COLOUR_ORANGE, WID_GL_TOYLAND), SetDataTip(SPR_SELECT_TOYLAND, STR_INTRO_TOOLTIP_TOYLAND_LANDSCAPE),
			NWidget(NWID_SPACER), SetFill(1, 0),
		EndContainer(),
		NWidget(NWID_SPACER), SetMinimalSize(0, 11), SetFill(0, 1),
		NWidget(NWID_HORIZONTAL), SetPIP(10, 3, 10),
			/* Labels at the left side. */
			NWidget(NWID_VERTICAL, NC_EQUALSIZE), SetPIP(0, 4, 0),
				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_HEIGHTMAP_NAME, STR_NULL), SetFill(1, 1),
				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_MAPSIZE, STR_NULL), SetFill(1, 1),
				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_HEIGHTMAP_ROTATION, STR_NULL), SetFill(1, 1),
				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_NUMBER_OF_TOWNS, STR_NULL), SetFill(1, 1),
				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_NUMBER_OF_INDUSTRIES, STR_NULL), SetFill(1, 1),
				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_QUANTITY_OF_RIVERS, STR_NULL), SetFill(1, 1),
				NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_TREE_PLACER, STR_NULL), SetFill(1, 1),
			EndContainer(),
			/* Widgets at the right of the labels. */
			NWidget(NWID_VERTICAL), SetPIP(0, 4, 0),
				NWidget(WWT_EMPTY, COLOUR_ORANGE, WID_GL_HEIGHTMAP_NAME_TEXT), SetFill(1, 0),
				NWidget(NWID_HORIZONTAL), SetPIP(0, 5, 0),
					NWidget(NWID_VERTICAL, NC_EQUALSIZE), SetPIP(0, 4, 0),
						/* Mapsize X * Y. */
						NWidget(NWID_HORIZONTAL), SetPIP(0, 4, 0),
							NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_MAPSIZE_X_PULLDOWN), SetDataTip(STR_JUST_INT, STR_NULL), SetFill(1, 0),
							NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_BY, STR_NULL), SetPadding(1, 0, 0, 0), SetFill(1, 1),
							NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_MAPSIZE_Y_PULLDOWN), SetDataTip(STR_JUST_INT, STR_NULL), SetFill(1, 0),
						EndContainer(),
						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_HEIGHTMAP_ROTATION_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_TOWN_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_INDUSTRY_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_RIVER_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
						NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_GL_TREE_PULLDOWN), SetDataTip(STR_JUST_STRING, STR_NULL), SetFill(1, 0),
					EndContainer(),
					NWidget(NWID_VERTICAL), SetPIP(0, 4, 0),
						NWidget(NWID_HORIZONTAL), SetPIP(0, 3, 0),
							NWidget(NWID_VERTICAL, NC_EQUALSIZE), SetPIP(0, 4, 0),
								NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_HEIGHTMAP_SIZE_LABEL, STR_NULL), SetFill(1, 1),
								NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_SNOW_LINE_HEIGHT, STR_NULL), SetFill(1, 1),
								NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_MAX_HEIGHTLEVEL, STR_NULL), SetFill(1, 1),
								NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_DATE, STR_NULL), SetFill(1, 1),
							EndContainer(),
							NWidget(NWID_VERTICAL, NC_EQUALSIZE), SetPIP(0, 4, 0),
								NWidget(WWT_TEXT, COLOUR_ORANGE, WID_GL_HEIGHTMAP_SIZE_TEXT), SetDataTip(STR_MAPGEN_HEIGHTMAP_SIZE, STR_NULL), SetFill(1, 0),
								NWidget(NWID_HORIZONTAL),
									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_MAPGEN_SNOW_LINE_DOWN), SetFill(0, 1),
									NWidget(WWT_TEXTBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_TEXT), SetDataTip(STR_BLACK_INT, STR_NULL), SetFill(1, 0),
									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_SNOW_LEVEL_UP), SetDataTip(SPR_ARROW_UP, STR_MAPGEN_SNOW_LINE_UP), SetFill(0, 1),
								EndContainer(),
								NWidget(NWID_HORIZONTAL),
									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_MAX_HEIGHTLEVEL_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_MAPGEN_MAX_HEIGHTLEVEL_DOWN), SetFill(0, 1),
									NWidget(WWT_TEXTBTN, COLOUR_ORANGE, WID_GL_MAX_HEIGHTLEVEL_TEXT), SetDataTip(STR_BLACK_INT, STR_NULL), SetFill(1, 0),
									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_MAX_HEIGHTLEVEL_UP), SetDataTip(SPR_ARROW_UP, STR_MAPGEN_MAX_HEIGHTLEVEL_UP), SetFill(0, 1),
								EndContainer(),
								NWidget(NWID_HORIZONTAL),
									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_START_DATE_DOWN), SetDataTip(SPR_ARROW_DOWN, STR_SCENEDIT_TOOLBAR_TOOLTIP_MOVE_THE_STARTING_DATE_BACKWARD), SetFill(0, 1),
									NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_GL_START_DATE_TEXT), SetDataTip(STR_BLACK_DATE_LONG, STR_NULL), SetFill(1, 0),
									NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_GL_START_DATE_UP), SetDataTip(SPR_ARROW_UP, STR_SCENEDIT_TOOLBAR_TOOLTIP_MOVE_THE_STARTING_DATE_FORWARD), SetFill(0, 1),
								EndContainer(),
							EndContainer(),
						EndContainer(),
						NWidget(WWT_PUSHTXTBTN, COLOUR_GREEN, WID_GL_GENERATE_BUTTON), SetMinimalSize(84, 0), SetDataTip(STR_MAPGEN_GENERATE, STR_NULL), SetFill(1, 1),
					EndContainer(),
				EndContainer(),
			EndContainer(),
		EndContainer(),
		NWidget(NWID_SPACER), SetMinimalSize(0, 9), SetFill(1, 1),
	EndContainer(),
};

static void StartGeneratingLandscape(GenerateLandscapeWindowMode mode)
{
	DeleteAllNonVitalWindows();
	ClearErrorMessages();

	/* Copy all XXX_newgame to XXX when coming from outside the editor */
	MakeNewgameSettingsLive();
	ResetGRFConfig(true);

	if (_settings_client.sound.confirm) SndPlayFx(SND_15_BEEP);
	switch (mode) {
		case GLWM_GENERATE:  _switch_mode = (_game_mode == GM_EDITOR) ? SM_GENRANDLAND    : SM_NEWGAME;         break;
		case GLWM_HEIGHTMAP: _switch_mode = (_game_mode == GM_EDITOR) ? SM_LOAD_HEIGHTMAP : SM_START_HEIGHTMAP; break;
		case GLWM_SCENARIO:  _switch_mode = SM_EDITOR; break;
		default: NOT_REACHED();
	}
}

static void LandscapeGenerationCallback(Window *w, bool confirmed)
{
	if (confirmed) StartGeneratingLandscape((GenerateLandscapeWindowMode)w->window_number);
}

static DropDownList *BuildMapsizeDropDown()
{
	DropDownList *list = new DropDownList();

	for (uint i = MIN_MAP_SIZE_BITS; i <= MAX_MAP_SIZE_BITS; i++) {
		DropDownListParamStringItem *item = new DropDownListParamStringItem(STR_JUST_INT, i, false);
		item->SetParam(0, 1LL << i);
		list->push_back(item);
	}

	return list;
}

static const StringID _elevations[]  = {STR_TERRAIN_TYPE_VERY_FLAT, STR_TERRAIN_TYPE_FLAT, STR_TERRAIN_TYPE_HILLY, STR_TERRAIN_TYPE_MOUNTAINOUS, STR_TERRAIN_TYPE_ALPINIST, INVALID_STRING_ID};
static const StringID _sea_lakes[]   = {STR_SEA_LEVEL_VERY_LOW, STR_SEA_LEVEL_LOW, STR_SEA_LEVEL_MEDIUM, STR_SEA_LEVEL_HIGH, STR_SEA_LEVEL_CUSTOM, INVALID_STRING_ID};
static const StringID _rivers[]      = {STR_RIVERS_NONE, STR_RIVERS_FEW, STR_RIVERS_MODERATE, STR_RIVERS_LOT, INVALID_STRING_ID};
static const StringID _smoothness[]  = {STR_CONFIG_SETTING_ROUGHNESS_OF_TERRAIN_VERY_SMOOTH, STR_CONFIG_SETTING_ROUGHNESS_OF_TERRAIN_SMOOTH, STR_CONFIG_SETTING_ROUGHNESS_OF_TERRAIN_ROUGH, STR_CONFIG_SETTING_ROUGHNESS_OF_TERRAIN_VERY_ROUGH, INVALID_STRING_ID};
static const StringID _tree_placer[] = {STR_CONFIG_SETTING_TREE_PLACER_NONE, STR_CONFIG_SETTING_TREE_PLACER_ORIGINAL, STR_CONFIG_SETTING_TREE_PLACER_IMPROVED, INVALID_STRING_ID};
static const StringID _rotation[]    = {STR_CONFIG_SETTING_HEIGHTMAP_ROTATION_COUNTER_CLOCKWISE, STR_CONFIG_SETTING_HEIGHTMAP_ROTATION_CLOCKWISE, INVALID_STRING_ID};
static const StringID _landscape[]   = {STR_CONFIG_SETTING_LAND_GENERATOR_ORIGINAL, STR_CONFIG_SETTING_LAND_GENERATOR_TERRA_GENESIS, INVALID_STRING_ID};
static const StringID _num_towns[]   = {STR_NUM_VERY_LOW, STR_NUM_LOW, STR_NUM_NORMAL, STR_NUM_HIGH, STR_NUM_CUSTOM, INVALID_STRING_ID};
static const StringID _num_inds[]    = {STR_FUNDING_ONLY, STR_MINIMAL, STR_NUM_VERY_LOW, STR_NUM_LOW, STR_NUM_NORMAL, STR_NUM_HIGH, INVALID_STRING_ID};
static const StringID _variety[]     = {STR_VARIETY_NONE, STR_VARIETY_VERY_LOW, STR_VARIETY_LOW, STR_VARIETY_MEDIUM, STR_VARIETY_HIGH, STR_VARIETY_VERY_HIGH, INVALID_STRING_ID};

assert_compile(lengthof(_num_inds) == ID_END + 1);

struct GenerateLandscapeWindow : public Window {
	uint widget_id;
	uint x;
	uint y;
	char name[64];
	GenerateLandscapeWindowMode mode;

	GenerateLandscapeWindow(WindowDesc *desc, WindowNumber number = 0) : Window(desc)
	{
		this->InitNested(number);

		this->LowerWidget(_settings_newgame.game_creation.landscape + WID_GL_TEMPERATE);

		this->mode = (GenerateLandscapeWindowMode)this->window_number;

		/* Disable town, industry and trees in SE */
		this->SetWidgetDisabledState(WID_GL_TOWN_PULLDOWN,     _game_mode == GM_EDITOR);
		this->SetWidgetDisabledState(WID_GL_INDUSTRY_PULLDOWN, _game_mode == GM_EDITOR);
		this->SetWidgetDisabledState(WID_GL_TREE_PULLDOWN,     _game_mode == GM_EDITOR);

		this->OnInvalidateData();
	}


	void SetStringParameters(int widget) const override
	{
		switch (widget) {
			case WID_GL_START_DATE_TEXT:      SetDParam(0, ConvertYMDToDate(_settings_newgame.game_creation.starting_year, 0, 1)); break;
			case WID_GL_MAPSIZE_X_PULLDOWN:   SetDParam(0, 1LL << _settings_newgame.game_creation.map_x); break;
			case WID_GL_MAPSIZE_Y_PULLDOWN:   SetDParam(0, 1LL << _settings_newgame.game_creation.map_y); break;
			case WID_GL_MAX_HEIGHTLEVEL_TEXT: SetDParam(0, _settings_newgame.construction.max_heightlevel); break;
			case WID_GL_SNOW_LEVEL_TEXT:      SetDParam(0, _settings_newgame.game_creation.snow_line_height); break;

			case WID_GL_TOWN_PULLDOWN:
				if (_game_mode == GM_EDITOR) {
					SetDParam(0, STR_CONFIG_SETTING_OFF);
				} else if (_settings_newgame.difficulty.number_towns == CUSTOM_TOWN_NUMBER_DIFFICULTY) {
					SetDParam(0, STR_NUM_CUSTOM_NUMBER);
					SetDParam(1, _settings_newgame.game_creation.custom_town_number);
				} else {
					SetDParam(0, _num_towns[_settings_newgame.difficulty.number_towns]);
				}
				break;

			case WID_GL_INDUSTRY_PULLDOWN:   SetDParam(0, _game_mode == GM_EDITOR ? STR_CONFIG_SETTING_OFF : _num_inds[_settings_newgame.difficulty.industry_density]); break;
			case WID_GL_LANDSCAPE_PULLDOWN:  SetDParam(0, _landscape[_settings_newgame.game_creation.land_generator]); break;
			case WID_GL_TREE_PULLDOWN:       SetDParam(0, _tree_placer[_settings_newgame.game_creation.tree_placer]); break;
			case WID_GL_TERRAIN_PULLDOWN:    SetDParam(0, _elevations[_settings_newgame.difficulty.terrain_type]); break;

			case WID_GL_WATER_PULLDOWN:
				if (_settings_newgame.difficulty.quantity_sea_lakes == CUSTOM_SEA_LEVEL_NUMBER_DIFFICULTY) {
					SetDParam(0, STR_SEA_LEVEL_CUSTOM_PERCENTAGE);
					SetDParam(1, _settings_newgame.game_creation.custom_sea_level);
				} else {
					SetDParam(0, _sea_lakes[_settings_newgame.difficulty.quantity_sea_lakes]);
				}
				break;

			case WID_GL_RIVER_PULLDOWN:      SetDParam(0, _rivers[_settings_newgame.game_creation.amount_of_rivers]); break;
			case WID_GL_SMOOTHNESS_PULLDOWN: SetDParam(0, _smoothness[_settings_newgame.game_creation.tgen_smoothness]); break;
			case WID_GL_VARIETY_PULLDOWN:    SetDParam(0, _variety[_settings_newgame.game_creation.variety]); break;
			case WID_GL_BORDERS_RANDOM:      SetDParam(0, (_settings_newgame.game_creation.water_borders == BORDERS_RANDOM) ? STR_MAPGEN_BORDER_RANDOMIZE : STR_MAPGEN_BORDER_MANUAL); break;
			case WID_GL_WATER_NE: SetDParam(0, (_settings_newgame.game_creation.water_borders == BORDERS_RANDOM) ? STR_MAPGEN_BORDER_RANDOM : HasBit(_settings_newgame.game_creation.water_borders, BORDER_NE) ? STR_MAPGEN_BORDER_WATER : STR_MAPGEN_BORDER_FREEFORM); break;
			case WID_GL_WATER_NW: SetDParam(0, (_settings_newgame.game_creation.water_borders == BORDERS_RANDOM) ? STR_MAPGEN_BORDER_RANDOM : HasBit(_settings_newgame.game_creation.water_borders, BORDER_NW) ? STR_MAPGEN_BORDER_WATER : STR_MAPGEN_BORDER_FREEFORM); break;
			case WID_GL_WATER_SE: SetDParam(0, (_settings_newgame.game_creation.water_borders == BORDERS_RANDOM) ? STR_MAPGEN_BORDER_RANDOM : HasBit(_settings_newgame.game_creation.water_borders, BORDER_SE) ? STR_MAPGEN_BORDER_WATER : STR_MAPGEN_BORDER_FREEFORM); break;
			case WID_GL_WATER_SW: SetDParam(0, (_settings_newgame.game_creation.water_borders == BORDERS_RANDOM) ? STR_MAPGEN_BORDER_RANDOM : HasBit(_settings_newgame.game_creation.water_borders, BORDER_SW) ? STR_MAPGEN_BORDER_WATER : STR_MAPGEN_BORDER_FREEFORM); break;
			case WID_GL_HEIGHTMAP_ROTATION_PULLDOWN: SetDParam(0, _rotation[_settings_newgame.game_creation.heightmap_rotation]); break;

			case WID_GL_HEIGHTMAP_SIZE_TEXT:
				if (_settings_newgame.game_creation.heightmap_rotation == HM_CLOCKWISE) {
					SetDParam(0, this->y);
					SetDParam(1, this->x);
				} else {
					SetDParam(0, this->x);
					SetDParam(1, this->y);
				}
				break;
		}
	}

	/**
	 * Some data on this window has become invalid.
	 * @param data Information about the changed data.
	 * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
	 */
	void OnInvalidateData(int data = 0, bool gui_scope = true) override
	{
		if (!gui_scope) return;
		/* Update the climate buttons */
		this->SetWidgetLoweredState(WID_GL_TEMPERATE, _settings_newgame.game_creation.landscape == LT_TEMPERATE);
		this->SetWidgetLoweredState(WID_GL_ARCTIC,    _settings_newgame.game_creation.landscape == LT_ARCTIC);
		this->SetWidgetLoweredState(WID_GL_TROPICAL,  _settings_newgame.game_creation.landscape == LT_TROPIC);
		this->SetWidgetLoweredState(WID_GL_TOYLAND,   _settings_newgame.game_creation.landscape == LT_TOYLAND);

		/* You can't select smoothness / non-water borders if not terragenesis */
		if (mode == GLWM_GENERATE) {
			this->SetWidgetDisabledState(WID_GL_SMOOTHNESS_PULLDOWN, _settings_newgame.game_creation.land_generator == LG_ORIGINAL);
			this->SetWidgetDisabledState(WID_GL_VARIETY_PULLDOWN, _settings_newgame.game_creation.land_generator == LG_ORIGINAL);
			this->SetWidgetDisabledState(WID_GL_BORDERS_RANDOM, _settings_newgame.game_creation.land_generator == LG_ORIGINAL || !_settings_newgame.construction.freeform_edges);
			this->SetWidgetsDisabledState(_settings_newgame.game_creation.land_generator == LG_ORIGINAL || !_settings_newgame.construction.freeform_edges || _settings_newgame.game_creation.water_borders == BORDERS_RANDOM,
					WID_GL_WATER_NW, WID_GL_WATER_NE, WID_GL_WATER_SE, WID_GL_WATER_SW, WIDGET_LIST_END);

			this->SetWidgetLoweredState(WID_GL_BORDERS_RANDOM, _settings_newgame.game_creation.water_borders == BORDERS_RANDOM);

			this->SetWidgetLoweredState(WID_GL_WATER_NW, HasBit(_settings_newgame.game_creation.water_borders, BORDER_NW));
			this->SetWidgetLoweredState(WID_GL_WATER_NE, HasBit(_settings_newgame.game_creation.water_borders, BORDER_NE));
			this->SetWidgetLoweredState(WID_GL_WATER_SE, HasBit(_settings_newgame.game_creation.water_borders, BORDER_SE));
			this->SetWidgetLoweredState(WID_GL_WATER_SW, HasBit(_settings_newgame.game_creation.water_borders, BORDER_SW));

			this->SetWidgetsDisabledState(_settings_newgame.game_creation.land_generator == LG_ORIGINAL && (_settings_newgame.game_creation.landscape == LT_ARCTIC || _settings_newgame.game_creation.landscape == LT_TROPIC),
					WID_GL_TERRAIN_PULLDOWN, WID_GL_WATER_PULLDOWN, WIDGET_LIST_END);
		}

		/* Disable snowline if not arctic */
		this->SetWidgetDisabledState(WID_GL_SNOW_LEVEL_TEXT, _settings_newgame.game_creation.landscape != LT_ARCTIC);

		/* Update availability of decreasing / increasing start date and snow level */
		this->SetWidgetDisabledState(WID_GL_MAX_HEIGHTLEVEL_DOWN, _settings_newgame.construction.max_heightlevel <= MIN_MAX_HEIGHTLEVEL);
		this->SetWidgetDisabledState(WID_GL_MAX_HEIGHTLEVEL_UP, _settings_newgame.construction.max_heightlevel >= MAX_MAX_HEIGHTLEVEL);
		this->SetWidgetDisabledState(WID_GL_START_DATE_DOWN, _settings_newgame.game_creation.starting_year <= MIN_YEAR);
		this->SetWidgetDisabledState(WID_GL_START_DATE_UP,   _settings_newgame.game_creation.starting_year >= MAX_YEAR);
		this->SetWidgetDisabledState(WID_GL_SNOW_LEVEL_DOWN, _settings_newgame.game_creation.snow_line_height <= MIN_SNOWLINE_HEIGHT || _settings_newgame.game_creation.landscape != LT_ARCTIC);
		this->SetWidgetDisabledState(WID_GL_SNOW_LEVEL_UP,   _settings_newgame.game_creation.snow_line_height >= MAX_SNOWLINE_HEIGHT || _settings_newgame.game_creation.landscape != LT_ARCTIC);

		/* Do not allow a custom sea level with the original land generator. */
		if (_settings_newgame.game_creation.land_generator == LG_ORIGINAL &&
				_settings_newgame.difficulty.quantity_sea_lakes == CUSTOM_SEA_LEVEL_NUMBER_DIFFICULTY) {
			_settings_newgame.difficulty.quantity_sea_lakes = CUSTOM_SEA_LEVEL_MIN_PERCENTAGE;
		}

	}

	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
	{
		const StringID *strs = NULL;
		switch (widget) {
			case WID_GL_MAX_HEIGHTLEVEL_TEXT:
				SetDParam(0, MAX_TILE_HEIGHT);
				*size = GetStringBoundingBox(STR_JUST_INT);
				break;

			case WID_GL_START_DATE_TEXT:
				SetDParam(0, ConvertYMDToDate(MAX_YEAR, 0, 1));
				*size = maxdim(*size, GetStringBoundingBox(STR_BLACK_DATE_LONG));
				break;

			case WID_GL_MAPSIZE_X_PULLDOWN:
			case WID_GL_MAPSIZE_Y_PULLDOWN:
				SetDParamMaxValue(0, MAX_MAP_SIZE);
				*size = maxdim(*size, GetStringBoundingBox(STR_JUST_INT));
				break;

			case WID_GL_SNOW_LEVEL_TEXT:
				SetDParamMaxValue(0, MAX_TILE_HEIGHT);
				*size = maxdim(*size, GetStringBoundingBox(STR_JUST_INT));
				break;

			case WID_GL_HEIGHTMAP_SIZE_TEXT:
				SetDParam(0, this->x);
				SetDParam(1, this->y);
				*size = maxdim(*size, GetStringBoundingBox(STR_MAPGEN_HEIGHTMAP_SIZE));
				break;

			case WID_GL_TOWN_PULLDOWN:
				strs = _num_towns;
				SetDParamMaxValue(0, CUSTOM_TOWN_MAX_NUMBER);
				*size = maxdim(*size, GetStringBoundingBox(STR_NUM_CUSTOM_NUMBER));
				break;

			case WID_GL_INDUSTRY_PULLDOWN:   strs = _num_inds; break;
			case WID_GL_LANDSCAPE_PULLDOWN:  strs = _landscape; break;
			case WID_GL_TREE_PULLDOWN:       strs = _tree_placer; break;
			case WID_GL_TERRAIN_PULLDOWN:    strs = _elevations; break;
			case WID_GL_WATER_PULLDOWN:
				strs = _sea_lakes;
				SetDParamMaxValue(0, CUSTOM_SEA_LEVEL_MAX_PERCENTAGE);
				*size = maxdim(*size, GetStringBoundingBox(STR_SEA_LEVEL_CUSTOM_PERCENTAGE));
				break;

			case WID_GL_RIVER_PULLDOWN:      strs = _rivers; break;
			case WID_GL_SMOOTHNESS_PULLDOWN: strs = _smoothness; break;
			case WID_GL_VARIETY_PULLDOWN:    strs = _variety; break;
			case WID_GL_HEIGHTMAP_ROTATION_PULLDOWN: strs = _rotation; break;
			case WID_GL_BORDERS_RANDOM:
				*size = maxdim(GetStringBoundingBox(STR_MAPGEN_BORDER_RANDOMIZE), GetStringBoundingBox(STR_MAPGEN_BORDER_MANUAL));
				break;

			case WID_GL_WATER_NE:
			case WID_GL_WATER_NW:
			case WID_GL_WATER_SE:
			case WID_GL_WATER_SW:
				*size = maxdim(GetStringBoundingBox(STR_MAPGEN_BORDER_RANDOM), maxdim(GetStringBoundingBox(STR_MAPGEN_BORDER_WATER), GetStringBoundingBox(STR_MAPGEN_BORDER_FREEFORM)));
				break;

			case WID_GL_HEIGHTMAP_NAME_TEXT:
				size->width = 0;
				break;

			default:
				return;
		}
		if (strs != NULL) {
			while (*strs != INVALID_STRING_ID) {
				*size = maxdim(*size, GetStringBoundingBox(*strs++));
			}
		}
		size->width += padding.width;
		size->height = max(size->height, (uint)(FONT_HEIGHT_NORMAL + WD_DROPDOWNTEXT_TOP + WD_DROPDOWNTEXT_BOTTOM));
	}

	void DrawWidget(const Rect &r, int widget) const override
	{
		switch (widget) {
			case WID_GL_HEIGHTMAP_NAME_TEXT: {
				DrawString(r.left, r.right, r.top, this->name, TC_ORANGE);
				break;
			}
		}
	}

	void OnClick(Point pt, int widget, int click_count) override
	{
		switch (widget) {
			case WID_GL_TEMPERATE:
			case WID_GL_ARCTIC:
			case WID_GL_TROPICAL:
			case WID_GL_TOYLAND:
				SetNewLandscapeType(widget - WID_GL_TEMPERATE);
				break;

			case WID_GL_MAPSIZE_X_PULLDOWN: // Mapsize X
				ShowDropDownList(this, BuildMapsizeDropDown(), _settings_newgame.game_creation.map_x, WID_GL_MAPSIZE_X_PULLDOWN);
				break;

			case WID_GL_MAPSIZE_Y_PULLDOWN: // Mapsize Y
				ShowDropDownList(this, BuildMapsizeDropDown(), _settings_newgame.game_creation.map_y, WID_GL_MAPSIZE_Y_PULLDOWN);
				break;

			case WID_GL_TOWN_PULLDOWN: // Number of towns
				ShowDropDownMenu(this, _num_towns, _settings_newgame.difficulty.number_towns, WID_GL_TOWN_PULLDOWN, 0, 0);
				break;

			case WID_GL_INDUSTRY_PULLDOWN: // Number of industries
				ShowDropDownMenu(this, _num_inds, _settings_newgame.difficulty.industry_density, WID_GL_INDUSTRY_PULLDOWN, 0, 0);
				break;

			case WID_GL_GENERATE_BUTTON: { // Generate
				/* Get rotated map size. */
				uint map_x;
				uint map_y;
				if (_settings_newgame.game_creation.heightmap_rotation == HM_CLOCKWISE) {
					map_x = this->y;
					map_y = this->x;
				} else {
					map_x = this->x;
					map_y = this->y;
				}
				if (mode == GLWM_HEIGHTMAP &&
						(map_x * 2 < (1U << _settings_newgame.game_creation.map_x) ||
						map_x / 2 > (1U << _settings_newgame.game_creation.map_x) ||
						map_y * 2 < (1U << _settings_newgame.game_creation.map_y) ||
						map_y / 2 > (1U << _settings_newgame.game_creation.map_y))) {
					ShowQuery(
						STR_WARNING_HEIGHTMAP_SCALE_CAPTION,
						STR_WARNING_HEIGHTMAP_SCALE_MESSAGE,
						this,
						LandscapeGenerationCallback);
				} else {
					StartGeneratingLandscape(mode);
				}
				break;
			}

			case WID_GL_MAX_HEIGHTLEVEL_DOWN:
			case WID_GL_MAX_HEIGHTLEVEL_UP: // Height level buttons
				/* Don't allow too fast scrolling */
				if (!(this->flags & WF_TIMEOUT) || this->timeout_timer <= 1) {
					this->HandleButtonClick(widget);

					_settings_newgame.construction.max_heightlevel = Clamp(_settings_newgame.construction.max_heightlevel + widget - WID_GL_MAX_HEIGHTLEVEL_TEXT, MIN_MAX_HEIGHTLEVEL, MAX_MAX_HEIGHTLEVEL);
					this->InvalidateData();
				}
				_left_button_clicked = false;
				break;

			case WID_GL_MAX_HEIGHTLEVEL_TEXT: // Height level text
				this->widget_id = WID_GL_MAX_HEIGHTLEVEL_TEXT;
				SetDParam(0, _settings_newgame.construction.max_heightlevel);
				ShowQueryString(STR_JUST_INT, STR_MAPGEN_MAX_HEIGHTLEVEL_QUERY_CAPT, 4, this, CS_NUMERAL, QSF_ENABLE_DEFAULT);
				break;


			case WID_GL_START_DATE_DOWN:
			case WID_GL_START_DATE_UP: // Year buttons
				/* Don't allow too fast scrolling */
				if (!(this->flags & WF_TIMEOUT) || this->timeout_timer <= 1) {
					this->HandleButtonClick(widget);

					_settings_newgame.game_creation.starting_year = Clamp(_settings_newgame.game_creation.starting_year + widget - WID_GL_START_DATE_TEXT, MIN_YEAR, MAX_YEAR);
					this->InvalidateData();
				}
				_left_button_clicked = false;
				break;

			case WID_GL_START_DATE_TEXT: // Year text
				this->widget_id = WID_GL_START_DATE_TEXT;
				SetDParam(0, _settings_newgame.game_creation.starting_year);
				ShowQueryString(STR_JUST_INT, STR_MAPGEN_START_DATE_QUERY_CAPT, 8, this, CS_NUMERAL, QSF_ENABLE_DEFAULT);
				break;

			case WID_GL_SNOW_LEVEL_DOWN:
			case WID_GL_SNOW_LEVEL_UP: // Snow line buttons
				/* Don't allow too fast scrolling */
				if (!(this->flags & WF_TIMEOUT) || this->timeout_timer <= 1) {
					this->HandleButtonClick(widget);

					_settings_newgame.game_creation.snow_line_height = Clamp(_settings_newgame.game_creation.snow_line_height + widget - WID_GL_SNOW_LEVEL_TEXT, MIN_SNOWLINE_HEIGHT, MAX_SNOWLINE_HEIGHT);
					this->InvalidateData();
				}
				_left_button_clicked = false;
				break;

			case WID_GL_SNOW_LEVEL_TEXT: // Snow line text
				this->widget_id = WID_GL_SNOW_LEVEL_TEXT;
				SetDParam(0, _settings_newgame.game_creation.snow_line_height);
				ShowQueryString(STR_JUST_INT, STR_MAPGEN_SNOW_LINE_QUERY_CAPT, 4, this, CS_NUMERAL, QSF_ENABLE_DEFAULT);
				break;

			case WID_GL_TREE_PULLDOWN: // Tree placer
				ShowDropDownMenu(this, _tree_placer, _settings_newgame.game_creation.tree_placer, WID_GL_TREE_PULLDOWN, 0, 0);
				break;

			case WID_GL_LANDSCAPE_PULLDOWN: // Landscape generator
				ShowDropDownMenu(this, _landscape, _settings_newgame.game_creation.land_generator, WID_GL_LANDSCAPE_PULLDOWN, 0, 0);
				break;

			case WID_GL_HEIGHTMAP_ROTATION_PULLDOWN: // Heightmap rotation
				ShowDropDownMenu(this, _rotation, _settings_newgame.game_creation.heightmap_rotation, WID_GL_HEIGHTMAP_ROTATION_PULLDOWN, 0, 0);
				break;

			case WID_GL_TERRAIN_PULLDOWN: // Terrain type
				/* For the original map generation only the first four are valid. */
				ShowDropDownMenu(this, _elevations, _settings_newgame.difficulty.terrain_type, WID_GL_TERRAIN_PULLDOWN, 0, _settings_newgame.game_creation.land_generator == LG_ORIGINAL ? ~0xF : 0);
				break;

			case WID_GL_WATER_PULLDOWN: { // Water quantity
				uint32 hidden_mask = 0;
				/* Disable custom water level when the original map generator is active. */
				if (_settings_newgame.game_creation.land_generator == LG_ORIGINAL) {
					SetBit(hidden_mask, CUSTOM_SEA_LEVEL_NUMBER_DIFFICULTY);
				}
				ShowDropDownMenu(this, _sea_lakes, _settings_newgame.difficulty.quantity_sea_lakes, WID_GL_WATER_PULLDOWN, 0, hidden_mask);
				break;
			}

			case WID_GL_RIVER_PULLDOWN: // Amount of rivers
				ShowDropDownMenu(this, _rivers, _settings_newgame.game_creation.amount_of_rivers, WID_GL_RIVER_PULLDOWN, 0, 0);
				break;

			case WID_GL_SMOOTHNESS_PULLDOWN: // Map smoothness
				ShowDropDownMenu(this, _smoothness, _settings_newgame.game_creation.tgen_smoothness, WID_GL_SMOOTHNESS_PULLDOWN, 0, 0);
				break;

			case WID_GL_VARIETY_PULLDOWN: // Map variety
				ShowDropDownMenu(this, _variety, _settings_newgame.game_creation.variety, WID_GL_VARIETY_PULLDOWN, 0, 0);
				break;

			/* Freetype map borders */
			case WID_GL_WATER_NW:
				_settings_newgame.game_creation.water_borders = ToggleBit(_settings_newgame.game_creation.water_borders, BORDER_NW);
				this->InvalidateData();
				break;

			case WID_GL_WATER_NE:
				_settings_newgame.game_creation.water_borders = ToggleBit(_settings_newgame.game_creation.water_borders, BORDER_NE);
				this->InvalidateData();
				break;

			case WID_GL_WATER_SE:
				_settings_newgame.game_creation.water_borders = ToggleBit(_settings_newgame.game_creation.water_borders, BORDER_SE);
				this->InvalidateData();
				break;

			case WID_GL_WATER_SW:
				_settings_newgame.game_creation.water_borders = ToggleBit(_settings_newgame.game_creation.water_borders, BORDER_SW);
				this->InvalidateData();
				break;

			case WID_GL_BORDERS_RANDOM:
				_settings_newgame.game_creation.water_borders = (_settings_newgame.game_creation.water_borders == BORDERS_RANDOM) ? 0 : BORDERS_RANDOM;
				this->InvalidateData();
				break;
		}
	}

	void OnTimeout() override
	{
		static const int raise_widgets[] = {WID_GL_MAX_HEIGHTLEVEL_DOWN, WID_GL_MAX_HEIGHTLEVEL_UP, WID_GL_START_DATE_DOWN, WID_GL_START_DATE_UP, WID_GL_SNOW_LEVEL_UP, WID_GL_SNOW_LEVEL_DOWN, WIDGET_LIST_END};
		for (const int *widget = raise_widgets; *widget != WIDGET_LIST_END; widget++) {
			if (this->IsWidgetLowered(*widget)) {
				this->RaiseWidget(*widget);
				this->SetWidgetDirty(*widget);
			}
		}
	}

	void OnDropdownSelect(int widget, int index) override
	{
		switch (widget) {
			case WID_GL_MAPSIZE_X_PULLDOWN:     _settings_newgame.game_creation.map_x = index; break;
			case WID_GL_MAPSIZE_Y_PULLDOWN:     _settings_newgame.game_creation.map_y = index; break;
			case WID_GL_TREE_PULLDOWN:          _settings_newgame.game_creation.tree_placer = index; break;
			case WID_GL_RIVER_PULLDOWN:         _settings_newgame.game_creation.amount_of_rivers = index; break;
			case WID_GL_SMOOTHNESS_PULLDOWN:    _settings_newgame.game_creation.tgen_smoothness = index;  break;
			case WID_GL_VARIETY_PULLDOWN:       _settings_newgame.game_creation.variety = index; break;

			case WID_GL_LANDSCAPE_PULLDOWN:     _settings_newgame.game_creation.land_generator = index;
				/* If original landgenerator is selected and alpinist terrain_type was selected, revert to mountainous. */
				if (_settings_newgame.game_creation.land_generator == LG_ORIGINAL) {
					_settings_newgame.difficulty.terrain_type = Clamp(_settings_newgame.difficulty.terrain_type, 0, 3);
				}
				break;

			case WID_GL_HEIGHTMAP_ROTATION_PULLDOWN: _settings_newgame.game_creation.heightmap_rotation = index; break;

			case WID_GL_TOWN_PULLDOWN:
				if ((uint)index == CUSTOM_TOWN_NUMBER_DIFFICULTY) {
					this->widget_id = widget;
					SetDParam(0, _settings_newgame.game_creation.custom_town_number);
					ShowQueryString(STR_JUST_INT, STR_MAPGEN_NUMBER_OF_TOWNS, 5, this, CS_NUMERAL, QSF_NONE);
				}
				_settings_newgame.difficulty.number_towns = index;
				break;

			case WID_GL_INDUSTRY_PULLDOWN: _settings_newgame.difficulty.industry_density = index; break;
			case WID_GL_TERRAIN_PULLDOWN:  _settings_newgame.difficulty.terrain_type     = index; break;

			case WID_GL_WATER_PULLDOWN: {
				if ((uint)index == CUSTOM_SEA_LEVEL_NUMBER_DIFFICULTY) {
					this->widget_id = widget;
					SetDParam(0, _settings_newgame.game_creation.custom_sea_level);
					ShowQueryString(STR_JUST_INT, STR_MAPGEN_QUANTITY_OF_SEA_LAKES, 3, this, CS_NUMERAL, QSF_NONE);
				}
				_settings_newgame.difficulty.quantity_sea_lakes = index;
				break;
			}
		}
		this->InvalidateData();
	}

	void OnQueryTextFinished(char *str) override
	{
		/* Was 'cancel' pressed? */
		if (str == NULL) return;

		int32 value;
		if (!StrEmpty(str)) {
			value = atoi(str);
		} else {
			/* An empty string means revert to the default */
			switch (this->widget_id) {
				case WID_GL_MAX_HEIGHTLEVEL_TEXT: value = DEF_MAX_HEIGHTLEVEL; break;
				case WID_GL_START_DATE_TEXT: value = DEF_START_YEAR; break;
				case WID_GL_SNOW_LEVEL_TEXT: value = DEF_SNOWLINE_HEIGHT; break;
				case WID_GL_TOWN_PULLDOWN:   value = 1; break;
				case WID_GL_WATER_PULLDOWN:  value = CUSTOM_SEA_LEVEL_MIN_PERCENTAGE; break;
				default: NOT_REACHED();
			}
		}

		switch (this->widget_id) {
			case WID_GL_MAX_HEIGHTLEVEL_TEXT:
				this->SetWidgetDirty(WID_GL_MAX_HEIGHTLEVEL_TEXT);
				_settings_newgame.construction.max_heightlevel = Clamp(value, MIN_MAX_HEIGHTLEVEL, MAX_MAX_HEIGHTLEVEL);
				break;

			case WID_GL_START_DATE_TEXT:
				this->SetWidgetDirty(WID_GL_START_DATE_TEXT);
				_settings_newgame.game_creation.starting_year = Clamp(value, MIN_YEAR, MAX_YEAR);
				break;

			case WID_GL_SNOW_LEVEL_TEXT:
				this->SetWidgetDirty(WID_GL_SNOW_LEVEL_TEXT);
				_settings_newgame.game_creation.snow_line_height = Clamp(value, MIN_SNOWLINE_HEIGHT, MAX_SNOWLINE_HEIGHT);
				break;

			case WID_GL_TOWN_PULLDOWN:
				_settings_newgame.game_creation.custom_town_number = Clamp(value, 1, CUSTOM_TOWN_MAX_NUMBER);
				break;

			case WID_GL_WATER_PULLDOWN:
				_settings_newgame.game_creation.custom_sea_level = Clamp(value, CUSTOM_SEA_LEVEL_MIN_PERCENTAGE, CUSTOM_SEA_LEVEL_MAX_PERCENTAGE);
				break;
		}

		this->InvalidateData();
	}
};

static WindowDesc _generate_landscape_desc(
	WDP_CENTER, NULL, 0, 0,
	WC_GENERATE_LANDSCAPE, WC_NONE,
	0,
	_nested_generate_landscape_widgets, lengthof(_nested_generate_landscape_widgets)
);

static WindowDesc _heightmap_load_desc(
	WDP_CENTER, NULL, 0, 0,
	WC_GENERATE_LANDSCAPE, WC_NONE,
	0,
	_nested_heightmap_load_widgets, lengthof(_nested_heightmap_load_widgets)
);

static void _ShowGenerateLandscape(GenerateLandscapeWindowMode mode)
{
	uint x = 0;
	uint y = 0;

	DeleteWindowByClass(WC_GENERATE_LANDSCAPE);

	/* Generate a new seed when opening the window */
	_settings_newgame.game_creation.generation_seed = InteractiveRandom();

	if (mode == GLWM_HEIGHTMAP) {
		/* If the function returns negative, it means there was a problem loading the heightmap */
		if (!GetHeightmapDimensions(_file_to_saveload.detail_ftype, _file_to_saveload.name, &x, &y)) return;
	}

	WindowDesc *desc = (mode == GLWM_HEIGHTMAP) ? &_heightmap_load_desc : &_generate_landscape_desc;
	GenerateLandscapeWindow *w = AllocateWindowDescFront<GenerateLandscapeWindow>(desc, mode, true);

	if (mode == GLWM_HEIGHTMAP) {
		w->x = x;
		w->y = y;
		strecpy(w->name, _file_to_saveload.title, lastof(w->name));
	}

	SetWindowDirty(WC_GENERATE_LANDSCAPE, mode);
}

/** Start with a normal game. */
void ShowGenerateLandscape()
{
	_ShowGenerateLandscape(GLWM_GENERATE);
}

/** Start with loading a heightmap. */
void ShowHeightmapLoad()
{
	_ShowGenerateLandscape(GLWM_HEIGHTMAP);
}

/** Start with a scenario editor. */
void StartScenarioEditor()
{
	StartGeneratingLandscape(GLWM_SCENARIO);
}

/**
 * Start a normal game without the GUI.
 * @param seed The seed of the new game.
 */
void StartNewGameWithoutGUI(uint32 seed)
{
	/* GenerateWorld takes care of the possible GENERATE_NEW_SEED value in 'seed' */
	_settings_newgame.game_creation.generation_seed = seed;

	StartGeneratingLandscape(GLWM_GENERATE);
}

struct CreateScenarioWindow : public Window
{
	uint widget_id;

	CreateScenarioWindow(WindowDesc *desc, WindowNumber window_number) : Window(desc)
	{
		this->InitNested(window_number);
		this->LowerWidget(_settings_newgame.game_creation.landscape + WID_CS_TEMPERATE);
	}

	void SetStringParameters(int widget) const override
	{
		switch (widget) {
			case WID_CS_START_DATE_TEXT:
				SetDParam(0, ConvertYMDToDate(_settings_newgame.game_creation.starting_year, 0, 1));
				break;

			case WID_CS_MAPSIZE_X_PULLDOWN:
				SetDParam(0, 1LL << _settings_newgame.game_creation.map_x);
				break;

			case WID_CS_MAPSIZE_Y_PULLDOWN:
				SetDParam(0, 1LL << _settings_newgame.game_creation.map_y);
				break;

			case WID_CS_FLAT_LAND_HEIGHT_TEXT:
				SetDParam(0, _settings_newgame.game_creation.se_flat_world_height);
				break;
		}
	}

	void OnPaint() override
	{
		this->SetWidgetDisabledState(WID_CS_START_DATE_DOWN,       _settings_newgame.game_creation.starting_year <= MIN_YEAR);
		this->SetWidgetDisabledState(WID_CS_START_DATE_UP,         _settings_newgame.game_creation.starting_year >= MAX_YEAR);
		this->SetWidgetDisabledState(WID_CS_FLAT_LAND_HEIGHT_DOWN, _settings_newgame.game_creation.se_flat_world_height <= 0);
		this->SetWidgetDisabledState(WID_CS_FLAT_LAND_HEIGHT_UP,   _settings_newgame.game_creation.se_flat_world_height >= MAX_TILE_HEIGHT);

		this->SetWidgetLoweredState(WID_CS_TEMPERATE, _settings_newgame.game_creation.landscape == LT_TEMPERATE);
		this->SetWidgetLoweredState(WID_CS_ARCTIC,    _settings_newgame.game_creation.landscape == LT_ARCTIC);
		this->SetWidgetLoweredState(WID_CS_TROPICAL,  _settings_newgame.game_creation.landscape == LT_TROPIC);
		this->SetWidgetLoweredState(WID_CS_TOYLAND,   _settings_newgame.game_creation.landscape == LT_TOYLAND);

		this->DrawWidgets();
	}

	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
	{
		StringID str = STR_JUST_INT;
		switch (widget) {
			case WID_CS_START_DATE_TEXT:
				SetDParam(0, ConvertYMDToDate(MAX_YEAR, 0, 1));
				str = STR_BLACK_DATE_LONG;
				break;

			case WID_CS_MAPSIZE_X_PULLDOWN:
			case WID_CS_MAPSIZE_Y_PULLDOWN:
				SetDParamMaxValue(0, MAX_MAP_SIZE);
				break;

			case WID_CS_FLAT_LAND_HEIGHT_TEXT:
				SetDParamMaxValue(0, MAX_TILE_HEIGHT);
				break;

			default:
				return;
		}
		*size = maxdim(*size, GetStringBoundingBox(str));
		size->width += padding.width;
		size->height += padding.height;
	}

	void OnClick(Point pt, int widget, int click_count) override
	{
		switch (widget) {
			case WID_CS_TEMPERATE:
			case WID_CS_ARCTIC:
			case WID_CS_TROPICAL:
			case WID_CS_TOYLAND:
				this->RaiseWidget(_settings_newgame.game_creation.landscape + WID_CS_TEMPERATE);
				SetNewLandscapeType(widget - WID_CS_TEMPERATE);
				break;

			case WID_CS_MAPSIZE_X_PULLDOWN: // Mapsize X
				ShowDropDownList(this, BuildMapsizeDropDown(), _settings_newgame.game_creation.map_x, WID_CS_MAPSIZE_X_PULLDOWN);
				break;

			case WID_CS_MAPSIZE_Y_PULLDOWN: // Mapsize Y
				ShowDropDownList(this, BuildMapsizeDropDown(), _settings_newgame.game_creation.map_y, WID_CS_MAPSIZE_Y_PULLDOWN);
				break;

			case WID_CS_EMPTY_WORLD: // Empty world / flat world
				StartGeneratingLandscape(GLWM_SCENARIO);
				break;

			case WID_CS_RANDOM_WORLD: // Generate
				ShowGenerateLandscape();
				break;

			case WID_CS_START_DATE_DOWN:
			case WID_CS_START_DATE_UP: // Year buttons
				/* Don't allow too fast scrolling */
				if (!(this->flags & WF_TIMEOUT) || this->timeout_timer <= 1) {
					this->HandleButtonClick(widget);
					this->SetDirty();

					_settings_newgame.game_creation.starting_year = Clamp(_settings_newgame.game_creation.starting_year + widget - WID_CS_START_DATE_TEXT, MIN_YEAR, MAX_YEAR);
				}
				_left_button_clicked = false;
				break;

			case WID_CS_START_DATE_TEXT: // Year text
				this->widget_id = WID_CS_START_DATE_TEXT;
				SetDParam(0, _settings_newgame.game_creation.starting_year);
				ShowQueryString(STR_JUST_INT, STR_MAPGEN_START_DATE_QUERY_CAPT, 8, this, CS_NUMERAL, QSF_NONE);
				break;

			case WID_CS_FLAT_LAND_HEIGHT_DOWN:
			case WID_CS_FLAT_LAND_HEIGHT_UP: // Height level buttons
				/* Don't allow too fast scrolling */
				if (!(this->flags & WF_TIMEOUT) || this->timeout_timer <= 1) {
					this->HandleButtonClick(widget);
					this->SetDirty();

					_settings_newgame.game_creation.se_flat_world_height = Clamp(_settings_newgame.game_creation.se_flat_world_height + widget - WID_CS_FLAT_LAND_HEIGHT_TEXT, 0, _settings_game.construction.max_heightlevel);
				}
				_left_button_clicked = false;
				break;

			case WID_CS_FLAT_LAND_HEIGHT_TEXT: // Height level text
				this->widget_id = WID_CS_FLAT_LAND_HEIGHT_TEXT;
				SetDParam(0, _settings_newgame.game_creation.se_flat_world_height);
				ShowQueryString(STR_JUST_INT, STR_SE_MAPGEN_FLAT_WORLD_HEIGHT_QUERY_CAPT, 4, this, CS_NUMERAL, QSF_NONE);
				break;
		}
	}

	void OnTimeout() override
	{
		static const int raise_widgets[] = {WID_CS_START_DATE_DOWN, WID_CS_START_DATE_UP, WID_CS_FLAT_LAND_HEIGHT_DOWN, WID_CS_FLAT_LAND_HEIGHT_UP, WIDGET_LIST_END};
		for (const int *widget = raise_widgets; *widget != WIDGET_LIST_END; widget++) {
			if (this->IsWidgetLowered(*widget)) {
				this->RaiseWidget(*widget);
				this->SetWidgetDirty(*widget);
			}
		}
	}

	void OnDropdownSelect(int widget, int index) override
	{
		switch (widget) {
			case WID_CS_MAPSIZE_X_PULLDOWN: _settings_newgame.game_creation.map_x = index; break;
			case WID_CS_MAPSIZE_Y_PULLDOWN: _settings_newgame.game_creation.map_y = index; break;
		}
		this->SetDirty();
	}

	void OnQueryTextFinished(char *str) override
	{
		if (!StrEmpty(str)) {
			int32 value = atoi(str);

			switch (this->widget_id) {
				case WID_CS_START_DATE_TEXT:
					this->SetWidgetDirty(WID_CS_START_DATE_TEXT);
					_settings_newgame.game_creation.starting_year = Clamp(value, MIN_YEAR, MAX_YEAR);
					break;

				case WID_CS_FLAT_LAND_HEIGHT_TEXT:
					this->SetWidgetDirty(WID_CS_FLAT_LAND_HEIGHT_TEXT);
					_settings_newgame.game_creation.se_flat_world_height = Clamp(value, 0, _settings_game.construction.max_heightlevel);
					break;
			}

			this->SetDirty();
		}
	}
};

static const NWidgetPart _nested_create_scenario_widgets[] = {
	NWidget(NWID_HORIZONTAL),
		NWidget(WWT_CLOSEBOX, COLOUR_BROWN),
		NWidget(WWT_CAPTION, COLOUR_BROWN), SetDataTip(STR_SE_MAPGEN_CAPTION, STR_NULL),
	EndContainer(),
	NWidget(WWT_PANEL, COLOUR_BROWN),
		NWidget(NWID_SPACER), SetMinimalSize(0, 10),
		/* Landscape style selection. */
		NWidget(NWID_HORIZONTAL), SetPIP(10, 3, 10),
			NWidget(WWT_IMGBTN_2, COLOUR_ORANGE, WID_CS_TEMPERATE), SetDataTip(SPR_SELECT_TEMPERATE, STR_INTRO_TOOLTIP_TEMPERATE),
			NWidget(WWT_IMGBTN_2, COLOUR_ORANGE, WID_CS_ARCTIC), SetDataTip(SPR_SELECT_SUB_ARCTIC, STR_INTRO_TOOLTIP_SUB_ARCTIC_LANDSCAPE),
			NWidget(WWT_IMGBTN_2, COLOUR_ORANGE, WID_CS_TROPICAL), SetDataTip(SPR_SELECT_SUB_TROPICAL, STR_INTRO_TOOLTIP_SUB_TROPICAL_LANDSCAPE),
			NWidget(WWT_IMGBTN_2, COLOUR_ORANGE, WID_CS_TOYLAND), SetDataTip(SPR_SELECT_TOYLAND, STR_INTRO_TOOLTIP_TOYLAND_LANDSCAPE),
		EndContainer(),
		NWidget(NWID_HORIZONTAL), SetPIP(10, 8, 10),
			/* Green generation type buttons: 'Flat land' and 'Random land'. */
			NWidget(NWID_VERTICAL), SetPIP(10, 6, 10),
				NWidget(WWT_PUSHTXTBTN, COLOUR_GREEN, WID_CS_EMPTY_WORLD), SetDataTip(STR_SE_MAPGEN_FLAT_WORLD, STR_SE_MAPGEN_FLAT_WORLD_TOOLTIP), SetFill(1, 1),
				NWidget(WWT_PUSHTXTBTN, COLOUR_GREEN, WID_CS_RANDOM_WORLD), SetDataTip(STR_SE_MAPGEN_RANDOM_LAND, STR_TERRAFORM_TOOLTIP_GENERATE_RANDOM_LAND), SetFill(1, 1),
			EndContainer(),
			/* Labels + setting drop-downs */
			NWidget(NWID_VERTICAL), SetPIP(10, 6, 10),
				/* Map size. */
				NWidget(NWID_HORIZONTAL),
					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_MAPSIZE, STR_NULL), SetPadding(1, 0, 0, 0),
					NWidget(NWID_SPACER), SetMinimalSize(6, 0), SetFill(1, 0),
					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_CS_MAPSIZE_X_PULLDOWN), SetDataTip(STR_JUST_INT, STR_NULL), SetPadding(0, 4, 0, 0),
					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_BY, STR_NULL), SetPadding(1, 2, 0, 0),
					NWidget(WWT_DROPDOWN, COLOUR_ORANGE, WID_CS_MAPSIZE_Y_PULLDOWN), SetDataTip(STR_JUST_INT, STR_NULL),
				EndContainer(),
				/* Date. */
				NWidget(NWID_HORIZONTAL),
					NWidget(WWT_TEXT, COLOUR_ORANGE), SetDataTip(STR_MAPGEN_DATE, STR_NULL), SetPadding(1, 0, 0, 0),
					NWidget(NWID_SPACER), SetMinimalSize(6, 0), SetFill(1, 0),
					NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_CS_START_DATE_DOWN), SetFill(0, 1), SetDataTip(SPR_ARROW_DOWN, STR_SCENEDIT_TOOLBAR_TOOLTIP_MOVE_THE_STARTING_DATE_BACKWARD),
					NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_CS_START_DATE_TEXT), SetDataTip(STR_BLACK_DATE_LONG, STR_NULL),
					NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_CS_START_DATE_UP), SetFill(0, 1), SetDataTip(SPR_ARROW_UP, STR_SCENEDIT_TOOLBAR_TOOLTIP_MOVE_THE_STARTING_DATE_FORWARD),
				EndContainer(),
				/* Flat map height. */
				NWidget(NWID_HORIZONTAL),
					NWidget(WWT_TEXT, COLOUR_ORANGE),
												SetDataTip(STR_SE_MAPGEN_FLAT_WORLD_HEIGHT, STR_NULL), SetPadding(1, 0, 0, 0),
					NWidget(NWID_SPACER), SetMinimalSize(6, 0), SetFill(1, 0),
					NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_CS_FLAT_LAND_HEIGHT_DOWN), SetFill(0, 1), SetDataTip(SPR_ARROW_DOWN, STR_SE_MAPGEN_FLAT_WORLD_HEIGHT_DOWN),
					NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_CS_FLAT_LAND_HEIGHT_TEXT), SetDataTip(STR_BLACK_INT, STR_NULL),
					NWidget(WWT_IMGBTN, COLOUR_ORANGE, WID_CS_FLAT_LAND_HEIGHT_UP), SetFill(0, 1), SetDataTip(SPR_ARROW_UP, STR_SE_MAPGEN_FLAT_WORLD_HEIGHT_UP),
				EndContainer(),
			EndContainer(),
		EndContainer(),
	EndContainer(),
};

static WindowDesc _create_scenario_desc(
	WDP_CENTER, NULL, 0, 0,
	WC_GENERATE_LANDSCAPE, WC_NONE,
	0,
	_nested_create_scenario_widgets, lengthof(_nested_create_scenario_widgets)
);

/** Show the window to create a scenario. */
void ShowCreateScenario()
{
	DeleteWindowByClass(WC_GENERATE_LANDSCAPE);
	new CreateScenarioWindow(&_create_scenario_desc, GLWM_SCENARIO);
}

static const NWidgetPart _nested_generate_progress_widgets[] = {
	NWidget(WWT_CAPTION, COLOUR_GREY), SetDataTip(STR_GENERATION_WORLD, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
	NWidget(WWT_PANEL, COLOUR_GREY),
		NWidget(NWID_HORIZONTAL), SetPIP(20, 0, 20),
			NWidget(NWID_VERTICAL), SetPIP(11, 8, 11),
				NWidget(WWT_EMPTY, INVALID_COLOUR, WID_GP_PROGRESS_BAR), SetFill(1, 0),
				NWidget(WWT_EMPTY, INVALID_COLOUR, WID_GP_PROGRESS_TEXT), SetFill(1, 0),
				NWidget(WWT_TEXTBTN, COLOUR_WHITE, WID_GP_ABORT), SetDataTip(STR_GENERATION_ABORT, STR_NULL), SetFill(1, 0),
			EndContainer(),
		EndContainer(),
	EndContainer(),
};


static WindowDesc _generate_progress_desc(
	WDP_CENTER, NULL, 0, 0,
	WC_MODAL_PROGRESS, WC_NONE,
	0,
	_nested_generate_progress_widgets, lengthof(_nested_generate_progress_widgets)
);

struct GenWorldStatus {
	uint percent;
	StringID cls;
	uint current;
	uint total;
	int timer;
};

static GenWorldStatus _gws;

static const StringID _generation_class_table[]  = {
	STR_GENERATION_WORLD_GENERATION,
	STR_SCENEDIT_TOOLBAR_LANDSCAPE_GENERATION,
	STR_GENERATION_RIVER_GENERATION,
	STR_GENERATION_CLEARING_TILES,
	STR_SCENEDIT_TOOLBAR_TOWN_GENERATION,
	STR_SCENEDIT_TOOLBAR_INDUSTRY_GENERATION,
	STR_GENERATION_OBJECT_GENERATION,
	STR_GENERATION_TREE_GENERATION,
	STR_GENERATION_SETTINGUP_GAME,
	STR_GENERATION_PREPARING_TILELOOP,
	STR_GENERATION_PREPARING_SCRIPT,
	STR_GENERATION_PREPARING_GAME
};
assert_compile(lengthof(_generation_class_table) == GWP_CLASS_COUNT);


static void AbortGeneratingWorldCallback(Window *w, bool confirmed)
{
	if (confirmed) {
		AbortGeneratingWorld();
	} else if (HasModalProgress() && !IsGeneratingWorldAborted()) {
		SetMouseCursor(SPR_CURSOR_ZZZ, PAL_NONE);
	}
}

struct GenerateProgressWindow : public Window {

	GenerateProgressWindow() : Window(&_generate_progress_desc)
	{
		this->InitNested();
	}

	void OnClick(Point pt, int widget, int click_count) override
	{
		switch (widget) {
			case WID_GP_ABORT:
				SetMouseCursorBusy(false);
				ShowQuery(
					STR_GENERATION_ABORT_CAPTION,
					STR_GENERATION_ABORT_MESSAGE,
					this,
					AbortGeneratingWorldCallback
				);
				break;
		}
	}

	void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
	{
		switch (widget) {
			case WID_GP_PROGRESS_BAR: {
				SetDParamMaxValue(0, 100);
				*size = GetStringBoundingBox(STR_GENERATION_PROGRESS);
				/* We need some spacing for the 'border' */
				size->height += 8;
				size->width += 8;
				break;
			}

			case WID_GP_PROGRESS_TEXT:
				for (uint i = 0; i < GWP_CLASS_COUNT; i++) {
					size->width = max(size->width, GetStringBoundingBox(_generation_class_table[i]).width);
				}
				size->height = FONT_HEIGHT_NORMAL * 2 + WD_PAR_VSEP_NORMAL;
				break;
		}
	}

	void DrawWidget(const Rect &r, int widget) const override
	{
		switch (widget) {
			case WID_GP_PROGRESS_BAR:
				/* Draw the % complete with a bar and a text */
				DrawFrameRect(r.left, r.top, r.right, r.bottom, COLOUR_GREY, FR_BORDERONLY);
				DrawFrameRect(r.left + 1, r.top + 1, (int)((r.right - r.left - 2) * _gws.percent / 100) + r.left + 1, r.bottom - 1, COLOUR_MAUVE, FR_NONE);
				SetDParam(0, _gws.percent);
				DrawString(r.left, r.right, r.top + 5, STR_GENERATION_PROGRESS, TC_FROMSTRING, SA_HOR_CENTER);
				break;

			case WID_GP_PROGRESS_TEXT:
				/* Tell which class we are generating */
				DrawString(r.left, r.right, r.top, _gws.cls, TC_FROMSTRING, SA_HOR_CENTER);

				/* And say where we are in that class */
				SetDParam(0, _gws.current);
				SetDParam(1, _gws.total);
				DrawString(r.left, r.right, r.top + FONT_HEIGHT_NORMAL + WD_PAR_VSEP_NORMAL, STR_GENERATION_PROGRESS_NUM, TC_FROMSTRING, SA_HOR_CENTER);
		}
	}
};

/**
 * Initializes the progress counters to the starting point.
 */
void PrepareGenerateWorldProgress()
{
	_gws.cls     = STR_GENERATION_WORLD_GENERATION;
	_gws.current = 0;
	_gws.total   = 0;
	_gws.percent = 0;
	_gws.timer   = 0; // Forces to paint the progress window immediately
}

/**
 * Show the window where a user can follow the process of the map generation.
 */
void ShowGenerateWorldProgress()
{
	if (BringWindowToFrontById(WC_MODAL_PROGRESS, 0)) return;
	new GenerateProgressWindow();
}

static void _SetGeneratingWorldProgress(GenWorldProgress cls, uint progress, uint total)
{
	static const int percent_table[] = {0, 5, 14, 17, 20, 40, 60, 65, 80, 85, 95, 99, 100 };
	assert_compile(lengthof(percent_table) == GWP_CLASS_COUNT + 1);
	assert(cls < GWP_CLASS_COUNT);

	/* Do not run this function if we aren't in a thread */
	if (!IsGenerateWorldThreaded() && !_network_dedicated) return;

	if (IsGeneratingWorldAborted()) HandleGeneratingWorldAbortion();

	if (total == 0) {
		assert(_gws.cls == _generation_class_table[cls]);
		_gws.current += progress;
		assert(_gws.current <= _gws.total);
	} else {
		_gws.cls     = _generation_class_table[cls];
		_gws.current = progress;
		_gws.total   = total;
		_gws.percent = percent_table[cls];
	}

	/* Don't update the screen too often. So update it once in every once in a while... */
	if (!_network_dedicated && _gws.timer != 0 && _realtime_tick - _gws.timer < MODAL_PROGRESS_REDRAW_TIMEOUT) return;

	/* Percentage is about the number of completed tasks, so 'current - 1' */
	_gws.percent = percent_table[cls] + (percent_table[cls + 1] - percent_table[cls]) * (_gws.current == 0 ? 0 : _gws.current - 1) / _gws.total;

	if (_network_dedicated) {
		static uint last_percent = 0;

		/* Never display 0% */
		if (_gws.percent == 0) return;
		/* Reset if percent is lower than the last recorded */
		if (_gws.percent < last_percent) last_percent = 0;
		/* Display every 5%, but 6% is also very valid.. just not smaller steps than 5% */
		if (_gws.percent % 5 != 0 && _gws.percent <= last_percent + 5) return;
		/* Never show steps smaller than 2%, even if it is a mod 5% */
		if (_gws.percent <= last_percent + 2) return;

		DEBUG(net, 1, "Map generation percentage complete: %d", _gws.percent);
		last_percent = _gws.percent;

		/* Don't continue as dedicated never has a thread running */
		return;
	}

	SetWindowDirty(WC_MODAL_PROGRESS, 0);
	MarkWholeScreenDirty();

	/* Release the rights to the map generator, and acquire the rights to the
	 * paint thread. The 'other' thread already has the paint thread rights so
	 * this ensures us that we are waiting until the paint thread is done
	 * before we reacquire the mapgen rights */
	_modal_progress_work_mutex.unlock();
	_modal_progress_paint_mutex.lock();
	_modal_progress_work_mutex.lock();
	_modal_progress_paint_mutex.unlock();

	_gws.timer = _realtime_tick;
}

/**
 * Set the total of a stage of the world generation.
 * @param cls the current class we are in.
 * @param total Set the total expected items for this class.
 *
 * Warning: this function isn't clever. Don't go from class 4 to 3. Go upwards, always.
 *  Also, progress works if total is zero, total works if progress is zero.
 */
void SetGeneratingWorldProgress(GenWorldProgress cls, uint total)
{
	if (total == 0) return;

	_SetGeneratingWorldProgress(cls, 0, total);
}

/**
 * Increases the current stage of the world generation with one.
 * @param cls the current class we are in.
 *
 * Warning: this function isn't clever. Don't go from class 4 to 3. Go upwards, always.
 *  Also, progress works if total is zero, total works if progress is zero.
 */
void IncreaseGeneratingWorldProgress(GenWorldProgress cls)
{
	/* In fact the param 'class' isn't needed.. but for some security reasons, we want it around */
	_SetGeneratingWorldProgress(cls, 1, 0);
}