2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2020, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure, Markus Armbruster
6 * Empire is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
21 * See files README, COPYING and CREDITS in the root of the source
22 * tree for related information and legal notices. It is expected
23 * that future projects/authors will amend these files as needed.
27 * fairland.c: Create a nice, new world
29 * Known contributors to this file:
32 * Markus Armbruster, 2004-2020
40 * Place the capitals on the torus in such a way so as to maximize
41 * their distances from one another. This uses the perturbation
42 * technique of calculus of variations.
44 * 2. Grow start islands ("continents")
46 * For all continents, add the first sector at the capital's location,
47 * and the second right to it. These are the capital sectors. Then
48 * add one sector to each continent in turn, until they have the
51 * Growth uses weighted random sampling to pick one sector from the
52 * set of adjacent sea sectors that aren't too close to another
53 * continent. Growth operates in spiking mode with a chance given by
54 * the spike percentage. When "spiking", a sector's weight increases
55 * with number of adjacent sea sectors. This directs the growth away
56 * from land, resulting in spikes. When not spiking, the weight
57 * increases with the number of adjacent land sectors. This makes the
58 * island more rounded.
60 * If growing fails due to lack of room, start over. If it fails too
61 * many times, give up and terminate unsuccessfully.
63 * 3. Place and grow additional islands
65 * Each continent has a "sphere of influence": the set of sectors
66 * closer to it than to any other continent. Each island is entirely
67 * in one such sphere, and each sphere contains the same number of
68 * islands with the same sizes.
70 * First, split the specified number of island sectors per continent
71 * randomly into the island sizes. Sort by size so that larger
72 * islands are grown before smaller ones, to give the large ones the
73 * best chance to grow to their planned size.
75 * Then place one island's first sector into each sphere, using
76 * weighted random sampling with weights favoring sectors away from
77 * land and other spheres. Add one sector to each island in turn,
78 * until they have the intended size. Repeat until the specified
79 * number of islands has been grown.
81 * If placement fails due to lack of room, start over, just like for
84 * Growing works as for continents, except the minimum distance for
85 * additional islands applies, and growing simply stops when any of
86 * the islands being grown lacks the room to grow further. The number
87 * of sectors not grown carries over to the next island size.
89 * 4. Compute elevation
91 * First, use a simple random hill algorithm to assign raw elevations:
92 * initialize elevation to zero, then randomly raise circular hills on
93 * land / lower circular depressions at sea. Their size and height
94 * depends on the distance to the coast.
96 * Then, elevate islands one after the other.
98 * Set the capitals' elevation to a fixed value. Process the
99 * remaining sectors in order of increasing raw elevation, first
100 * non-mountains, then mountains. Non-mountain elevation starts at 1,
101 * and increases linearly to just below "high" elevation. Mountain
102 * elevation starts at "high" elevation, and increases linearly.
104 * This gives islands of the same size the same set of elevations.
105 * Larger islands get more and taller mountains.
107 * Finally, elevate sea: normalize the raw elevations to [-127:-1].
111 * Sector resources are simple functions of elevation. You can alter
112 * iron_conf[], gold_conf[], fert_conf[], oil_conf[], and uran_conf[]
127 #include "prototypes.h"
132 /* do not change these defines */
133 #define LANDMIN 1 /* plate altitude for normal land */
134 #define PLATMIN 36 /* plate altitude for plateau */
135 #define HIGHMIN 98 /* plate altitude for mountains */
138 * Resource configuration
140 * Resources are determined by elevation. The map from elevation to
141 * resource is defined as a linear interpolation of resource data
142 * points (elev, res) defined in the tables below. Elevations range
143 * from -127 to 127, and resource values from 0 to 100.
146 struct resource_point {
150 struct resource_point iron_conf[] = {
154 { HIGHMIN - 1, 100 },
158 struct resource_point gold_conf[] = {
165 struct resource_point fert_conf[] = {
174 struct resource_point oil_conf[] = {
183 struct resource_point uran_conf[] = {
191 static void qprint(const char * const fmt, ...)
192 ATTRIBUTE((format (printf, 1, 2)));
195 * Program arguments and options
197 static char *program_name;
198 static int nc, sc; /* number and size of continents */
199 static int ni, is; /* number and size of islands */
200 #define DEFAULT_SPIKE 10
201 static int sp = DEFAULT_SPIKE; /* spike percentage */
202 #define DEFAULT_MOUNTAIN 0
203 static int pm = DEFAULT_MOUNTAIN; /* mountain percentage */
204 #define DEFAULT_CONTDIST 2
205 static int di = DEFAULT_CONTDIST; /* min. distance between continents */
206 #define DEFAULT_ISLDIST 1
207 static int id = DEFAULT_ISLDIST; /* ... continents and islands */
208 /* don't let the islands crash into each other.
209 1 = don't merge, 0 = merge. */
210 static int DISTINCT_ISLANDS = 1;
212 #define DEFAULT_OUTFILE_NAME "newcap_script"
213 static const char *outfile = DEFAULT_OUTFILE_NAME;
215 #define STABLE_CYCLE 4 /* stability required for perterbed capitals */
216 #define DRIFT_BEFORE_CHECK ((WORLD_X + WORLD_Y)/2)
217 #define DRIFT_MAX ((WORLD_X + WORLD_Y)*2)
222 #define new_x(newx) (((newx) + WORLD_X) % WORLD_X)
223 #define new_y(newy) (((newy) + WORLD_Y) % WORLD_Y)
231 * isecs[i] is the size of the i-th island.
235 static int *capx, *capy; /* location of the nc capitals */
239 * The i-th island's j-th sector is at sect[i][j].
245 * own[XYOFFSET(x, y)] is x,y's island number, -1 if water.
250 * Adjacent land sectors
251 * adj_land[XYOFFSET(x, y)] bit d is set exactly when the sector next
252 * to x, y in direction d is land.
254 static unsigned char *adj_land;
258 * elev[XYOFFSET(x, y)] is x,y's elevation.
264 * Each island is surrounded by an exclusive zone where only it may
265 * grow. The width of the zone depends on minimum distances.
266 * While growing continents, it is @di sectors wide.
267 * While growing additional islands, it is @id sectors wide.
268 * DISTINCT_ISLANDS nullifies the exclusive zone then.
269 * xzone[XYOFFSET(x, y)] is -1 when the sector is in no exclusive
270 * zone, a (non-negative) island number when it is in that island's
271 * exclusive zone and no other, and -2 when it is in multiple
277 * Set of sectors seen already
278 * Increment @cur_seen to empty the set of sectors seen, set
279 * seen[XYOFFSET(x, y)] to @cur_seen to add x,y to the set.
281 static unsigned *seen;
282 static unsigned cur_seen;
285 * Closest continent and "distance"
286 * closest[XYOFFSET(x, y)] is the closest continent's number.
287 * distance[] is complicated; see init_spheres_of_influence() and
288 * init_distance_to_coast().
290 static natid *closest;
291 static unsigned short *distance;
294 * Queue for breadth-first search
296 static int *bfs_queue;
297 static int bfs_queue_head, bfs_queue_tail;
299 #define NUMTRIES 10 /* keep trying to grow this many times */
301 static const char *numletter =
302 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
304 static void help(char *);
305 static void usage(void);
306 static void parse_args(int argc, char *argv[]);
307 static void allocate_memory(void);
308 static void init(void);
309 static int drift(void);
310 static int grow_continents(void);
311 static void create_elevations(void);
312 static void write_sects(void);
313 static void output(void);
314 static int write_newcap_script(void);
315 static int stable(int);
316 static void elevate_prep(void);
317 static void elevate_land(void);
318 static void elevate_sea(void);
320 static void print_vars(void);
321 static void fl_move(int);
322 static int grow_islands(void);
324 /* Debugging aids: */
325 void print_own_map(void);
326 void print_xzone_map(void);
327 void print_closest_map(void);
328 void print_distance_map(void);
329 void print_elev_map(void);
331 /****************************************************************************
333 ****************************************************************************/
336 main(int argc, char *argv[])
339 char *config_file = NULL;
341 unsigned rnd_seed = 0;
344 program_name = argv[0];
346 while ((opt = getopt(argc, argv, "e:hiqR:s:v")) != EOF) {
349 config_file = optarg;
352 DISTINCT_ISLANDS = 0;
358 rnd_seed = strtoul(optarg, NULL, 10);
368 printf("%s\n\n%s", version, legal);
377 rnd_seed = pick_seed();
380 if (emp_config(config_file) < 0)
384 parse_args(argc - optind, argv + optind);
389 qprint("\n #*# ...fairland rips open a rift in the datumplane... #*#\n\n");
390 qprint("seed is %u\n", rnd_seed);
395 qprint("\ntry #%d (out of %d)...\n", try + 1, NUMTRIES);
396 qprint("placing capitals...\n");
398 qprint("unstable drift\n");
399 qprint("growing continents...\n");
400 done = grow_continents();
403 qprint("growing islands:");
404 done = grow_islands();
405 } while (!done && ++try < NUMTRIES);
407 fprintf(stderr, "%s: world not large enough for this much land\n",
411 qprint("elevating land...\n");
414 qprint("writing to sectors file...\n");
415 if (!write_newcap_script())
417 if (chdir(gamedir)) {
418 fprintf(stderr, "%s: can't chdir to %s (%s)\n",
419 program_name, gamedir, strerror(errno));
422 if (!ef_open(EF_SECTOR, EFF_MEM | EFF_NOTIME))
425 if (!ef_close(EF_SECTOR))
429 qprint("\n\nA script for adding all the countries can be found in \"%s\".\n",
439 puts("Creating a planet with:\n");
440 printf("%d continents\n", nc);
441 printf("continent size: %d\n", sc);
442 printf("number of islands: %d\n", ni);
443 printf("average size of islands: %d\n", is);
444 printf("spike: %d%%\n", sp);
445 printf("%d%% of land is mountain (each continent will have %d mountains)\n",
446 pm, (pm * sc) / 100);
447 printf("minimum distance between continents: %d\n", di);
448 printf("minimum distance from islands to continents: %d\n", id);
449 printf("World dimensions: %dx%d\n", WORLD_X, WORLD_Y);
453 help(char *complaint)
456 fprintf(stderr, "%s: %s\n", program_name, complaint);
457 fprintf(stderr, "Try -h for help.\n");
463 printf("Usage: %s [OPTION]... NC SC [NI] [IS] [SP] [PM] [DI] [ID]\n"
464 " -e CONFIG-FILE configuration file\n"
466 " -i islands may merge\n"
468 " -R SEED seed for random number generator\n"
469 " -s SCRIPT name of script to create (default %s)\n"
470 " -h display this help and exit\n"
471 " -v display version information and exit\n"
472 " NC number of continents\n"
473 " SC continent size\n"
474 " NI number of islands (default NC)\n"
475 " IS average island size (default SC/2)\n"
476 " SP spike percentage: 0 = round, 100 = snake (default %d)\n"
477 " PM percentage of land that is mountain (default %d)\n"
478 " DI minimum distance between continents (default %d)\n"
479 " ID minimum distance from islands to continents (default %d)\n",
480 program_name, dflt_econfig, DEFAULT_OUTFILE_NAME,
481 DEFAULT_SPIKE, DEFAULT_MOUNTAIN, DEFAULT_CONTDIST, DEFAULT_ISLDIST);
485 parse_args(int argc, char *argv[])
487 int dist_max = mapdist(0, 0, WORLD_X / 2, WORLD_Y / 2);
490 help("missing arguments");
494 help("too many arguments");
499 fprintf(stderr, "%s: number of continents must be > 0\n",
506 fprintf(stderr, "%s: size of continents must be > 1\n",
517 fprintf(stderr, "%s: number of islands must be >= 0\n",
522 fprintf(stderr, "%s: number of islands must be a multiple of"
523 " the number of continents\n",
531 fprintf(stderr, "%s: size of islands must be > 0\n",
538 if (sp < 0 || sp > 100) {
540 "%s: spike percentage must be between 0 and 100\n",
547 if (pm < 0 || pm > 100) {
549 "%s: mountain percentage must be between 0 and 100\n",
557 fprintf(stderr, "%s: distance between continents must be >= 0\n",
562 fprintf(stderr, "%s: distance between continents too large\n",
571 "%s: distance from islands to continents must be >= 0\n",
577 "%s: distance from islands to continents too large\n",
583 /****************************************************************************
584 VARIABLE INITIALIZATION
585 ****************************************************************************/
588 allocate_memory(void)
592 capx = calloc(nc, sizeof(int));
593 capy = calloc(nc, sizeof(int));
594 own = malloc(WORLD_SZ() * sizeof(*own));
595 adj_land = malloc(WORLD_SZ() * sizeof(*adj_land));
596 elev = calloc(WORLD_SZ(), sizeof(*elev));
597 xzone = malloc(WORLD_SZ() * sizeof(*xzone));
598 seen = calloc(WORLD_SZ(), sizeof(*seen));
599 closest = malloc(WORLD_SZ() * sizeof(*closest));
600 distance = malloc(WORLD_SZ() * sizeof(*distance));
601 bfs_queue = malloc(WORLD_SZ() * sizeof(*bfs_queue));
602 isecs = calloc(nc + ni, sizeof(int));
603 sect = malloc((nc + ni) * sizeof(*sect));
604 for (i = 0; i < nc; i++)
605 sect[i] = malloc(sc * sizeof(**sect));
606 for (i = nc; i < nc + ni; i++)
607 sect[i] = malloc(is * 2 * sizeof(**sect));
615 for (i = 0; i < WORLD_SZ(); i++)
617 memset(adj_land, 0, WORLD_SZ() * sizeof(*adj_land));
620 /****************************************************************************
621 DRIFT THE CAPITALS UNTIL THEY ARE AS FAR AWAY FROM EACH OTHER AS POSSIBLE
622 ****************************************************************************/
625 * How isolated is capital @j at @newx,@newy?
626 * Return the distance to the closest other capital.
629 iso(int j, int newx, int newy)
634 for (i = 0; i < nc; ++i) {
637 md = mapdist(capx[i], capy[i], newx, newy);
647 * Return 1 for a stable drift, 0 for an unstable one.
654 for (i = 0; i < nc; i++) {
655 capy[i] = (2 * i) / WORLD_X;
656 capx[i] = (2 * i) % WORLD_X + capy[i] % 2;
657 if (capy[i] >= WORLD_Y) {
659 "%s: world not big enough for all the continents\n",
665 for (turns = 0; turns < DRIFT_MAX; ++turns) {
668 for (i = 0; i < nc; ++i)
675 * Has the drift stabilized?
676 * @turns is the number of turns so far.
681 static int mc[STABLE_CYCLE];
682 int i, isod, d = 0, stab = 1;
685 for (i = 0; i < STABLE_CYCLE; i++)
689 if (turns <= DRIFT_BEFORE_CHECK)
692 for (i = 0; i < nc; ++i) {
693 isod = iso(i, capx[i], capy[i]);
698 for (i = 0; i < STABLE_CYCLE; ++i)
702 mc[turns % STABLE_CYCLE] = d;
706 /* This routine does the actual drifting
712 int dir, i, newx, newy;
714 dir = DIR_L + roll0(6);
715 for (i = 0; i < 6; i++) {
718 newx = new_x(capx[j] + diroff[dir][0]);
719 newy = new_y(capy[j] + diroff[dir][1]);
721 if (iso(j, newx, newy) >= iso(j, capx[j], capy[j])) {
729 /****************************************************************************
731 ****************************************************************************/
734 is_coastal(int x, int y)
736 return adj_land[XYOFFSET(x, y)]
737 != (1u << (DIR_LAST + 1)) - (1u << DIR_FIRST);
740 struct hexagon_iter {
745 * Start iterating around @x0,@y0 at distance @d.
746 * Set *x,*y to coordinates of the first sector.
749 hexagon_first(struct hexagon_iter *iter, int x0, int y0, int n,
752 *x = new_x(x0 - 2 * n);
754 iter->dir = DIR_FIRST;
760 * Continue iteration started with hexagon_first().
761 * Set *x,*y to coordinates of the next sector.
762 * Return whether we're back at the first sector, i.e. iteration is
766 hexagon_next(struct hexagon_iter *iter, int *x, int *y)
768 *x = new_x(*x + diroff[iter->dir][0]);
769 *y = new_y(*y + diroff[iter->dir][1]);
771 if (iter->i == iter->n) {
775 return iter->dir <= DIR_LAST;
779 * Is @x,@y in no exclusive zone other than perhaps @c's?
782 xzone_ok(int c, int x, int y)
784 int off = XYOFFSET(x, y);
786 return xzone[off] == c || xzone[off] == -1;
790 * Add sectors within distance @dist of @x,@y to @c's exclusive zone.
793 xzone_around_sector(int c, int x, int y, int dist)
796 struct hexagon_iter hexit;
798 assert(xzone_ok(c, x, y));
800 xzone[XYOFFSET(x, y)] = c;
801 for (d = 1; d <= dist; d++) {
802 hexagon_first(&hexit, x, y, d, &x1, &y1);
804 off = XYOFFSET(x1, y1);
805 if (xzone[off] == -1)
807 else if (xzone[off] != c)
809 } while (hexagon_next(&hexit, &x1, &y1));
814 * Add sectors within distance @dist to island @c's exclusive zone.
817 xzone_around_island(int c, int dist)
821 for (i = 0; i < isecs[c]; i++)
822 xzone_around_sector(c, sect[c][i].x, sect[c][i].y, dist);
826 * Initialize exclusive zones around @n islands.
833 for (i = 0; i < WORLD_SZ(); i++)
836 for (c = 0; c < n; c++)
837 xzone_around_island(c, id);
841 * Initialize breadth-first search.
848 for (i = 0; i < WORLD_SZ(); i++) {
850 distance[i] = USHRT_MAX;
853 bfs_queue_head = bfs_queue_tail = 0;
857 * Add sector @x,@y to the BFS queue.
858 * It's closest to @c, with distance @dist.
861 bfs_enqueue(int c, int x, int y, int dist)
863 int off = XYOFFSET(x, y);
865 assert(dist < distance[off]);
867 distance[off] = dist;
868 bfs_queue[bfs_queue_tail] = off;
870 if (bfs_queue_tail >= WORLD_SZ())
872 assert(bfs_queue_tail != bfs_queue_head);
876 * Search breadth-first until the queue is empty.
881 int off, dist, i, noff, nx, ny;
884 while (bfs_queue_head != bfs_queue_tail) {
885 off = bfs_queue[bfs_queue_head];
887 if (bfs_queue_head >= WORLD_SZ())
889 dist = distance[off] + 1;
890 sctoff2xy(&x, &y, off);
891 for (i = DIR_FIRST; i <= DIR_LAST; i++) {
892 nx = new_x(x + diroff[i][0]);
893 ny = new_y(y + diroff[i][1]);
894 noff = XYOFFSET(nx, ny);
895 if (dist < distance[noff]) {
896 bfs_enqueue(closest[off], nx, ny, dist);
897 } else if (distance[noff] == dist) {
898 if (closest[off] != closest[noff])
899 closest[noff] = (natid)-1;
901 assert(distance[noff] < dist);
907 * Add island @c's coastal sectors to the BFS queue, with distance 0.
910 bfs_enqueue_island(int c)
914 for (i = 0; i < isecs[c]; i++) {
915 if (is_coastal(sect[c][i].x, sect[c][i].y))
916 bfs_enqueue(c, sect[c][i].x, sect[c][i].y, 0);
921 * Enqueue spheres of influence borders for breadth-first search.
924 bfs_enqueue_border(void)
926 int x, y, off, dir, nx, ny, noff;
928 for (y = 0; y < WORLD_Y; y++) {
929 for (x = y % 2; x < WORLD_X; x += 2) {
930 off = XYOFFSET(x, y);
931 if (distance[off] <= id + 1)
933 if (closest[off] == (natid)-1)
935 for (dir = DIR_FIRST; dir <= DIR_LAST; dir++) {
936 nx = new_x(x + diroff[dir][0]);
937 ny = new_y(y + diroff[dir][1]);
938 noff = XYOFFSET(nx, ny);
939 if (closest[noff] != closest[off]) {
940 bfs_enqueue(closest[off], x, y, id + 1);
949 * Compute spheres of influence
950 * A continent's sphere of influence is the set of sectors closer to
951 * it than to any other continent.
952 * Set closest[XYOFFSET(x, y)] to the closest continent's number,
953 * -1 if no single continent is closest.
954 * Set distance[XYOFFSET(x, y)] to the minimum of the distance to the
955 * closest coastal land sector and the distance to just outside the
956 * sphere of influence plus @id. For sea sectors within a continent's
957 * sphere of influence, distance[off] - id is the distance to the
958 * border of the area where additional islands can be placed.
961 init_spheres_of_influence(void)
966 for (c = 0; c < nc; c++)
967 bfs_enqueue_island(c);
969 bfs_enqueue_border();
974 * Precompute distance to coast
975 * Set distance[XYOFFSET(x, y)] to the distance to the closest coastal
977 * Set closest[XYOFFSET(x, y)] to the closest continent's number,
978 * -1 if no single continent is closest.
981 init_distance_to_coast(void)
986 for (c = 0; c < nc + ni; c++)
987 bfs_enqueue_island(c);
992 * Is @x,@y in the same sphere of influence as island @c?
993 * Always true when @c is a continent.
996 is_in_sphere(int c, int x, int y)
998 return c < nc || closest[XYOFFSET(x, y)] == c % nc;
1002 * Can island @c grow at @x,@y?
1005 can_grow_at(int c, int x, int y)
1007 return own[XYOFFSET(x, y)] == -1 && xzone_ok(c, x, y)
1008 && is_in_sphere(c, x, y);
1012 adj_land_update(int x, int y)
1014 int is_land = own[XYOFFSET(x, y)] != -1;
1015 int dir, nx, ny, noff;
1017 for (dir = DIR_FIRST; dir <= DIR_LAST; dir++) {
1018 nx = new_x(x + diroff[dir][0]);
1019 ny = new_y(y + diroff[dir][1]);
1020 noff = XYOFFSET(nx, ny);
1022 adj_land[noff] |= 1u << DIR_BACK(dir);
1024 adj_land[noff] &= ~(1u << DIR_BACK(dir));
1029 add_sector(int c, int x, int y)
1031 int off = XYOFFSET(x, y);
1033 assert(own[off] == -1);
1034 xzone_around_sector(c, x, y, c < nc ? di : DISTINCT_ISLANDS ? id : 0);
1035 sect[c][isecs[c]].x = x;
1036 sect[c][isecs[c]].y = y;
1039 adj_land_update(x, y);
1043 grow_weight(int c, int x, int y, int spike)
1048 * #Land neighbors is #bits set in adj_land[].
1049 * Count them Brian Kernighan's way.
1052 for (b = adj_land[XYOFFSET(x, y)]; b; b &= b - 1)
1054 assert(n > 0 && n < 7);
1057 return (6 - n) * (6 - n);
1063 grow_one_sector(int c)
1065 int spike = roll0(100) < sp;
1066 int wsum, newx, newy, i, x, y, off, dir, nx, ny, noff, w;
1068 assert(cur_seen < UINT_MAX);
1073 for (i = 0; i < isecs[c]; i++) {
1076 off = XYOFFSET(x, y);
1078 for (dir = DIR_FIRST; dir <= DIR_LAST; dir++) {
1079 if (adj_land[off] & (1u << dir))
1081 nx = new_x(x + diroff[dir][0]);
1082 ny = new_y(y + diroff[dir][1]);
1083 noff = XYOFFSET(nx, ny);
1084 if (seen[noff] == cur_seen)
1086 assert(seen[noff] < cur_seen);
1087 seen[noff] = cur_seen;
1088 if (!can_grow_at(c, nx, ny))
1090 w = grow_weight(c, nx, ny, spike);
1091 assert(wsum < INT_MAX - w);
1093 if (roll0(wsum) < w) {
1103 add_sector(c, newx, newy);
1108 * Grow the continents.
1109 * Return 1 on success, 0 on error.
1112 grow_continents(void)
1119 for (c = 0; c < nc; ++c) {
1121 if (!can_grow_at(c, capx[c], capy[c])
1122 || !can_grow_at(c, new_x(capx[c] + 2), capy[c])) {
1126 add_sector(c, capx[c], capy[c]);
1127 add_sector(c, new_x(capx[c] + 2), capy[c]);
1131 qprint("No room for continents\n");
1135 for (secs = 2; secs < sc && done; secs++) {
1136 for (c = 0; c < nc; ++c) {
1137 if (!grow_one_sector(c))
1143 qprint("Only managed to grow %d out of %d sectors.\n",
1148 /****************************************************************************
1150 ****************************************************************************/
1153 * Place additional island @c's first sector.
1154 * Return 1 on success, 0 on error.
1157 place_island(int c, int isiz)
1159 int n, x, y, d, w, newx, newy;
1163 for (y = 0; y < WORLD_Y; y++) {
1164 for (x = y % 2; x < WORLD_X; x += 2) {
1165 if (can_grow_at(c, x, y)) {
1166 d = distance[XYOFFSET(x, y)];
1168 w = (d - id) * (d - id);
1169 n += MIN(w, (isiz + 2) / 3);
1179 add_sector(c, newx, newy);
1184 int_cmp(const void *a, const void *b)
1186 return *(int *)b - *(int *)a;
1193 int *isiz = malloc(n * sizeof(*isiz));
1198 for (i = 1; i < n; i++) {
1201 isiz[i] = is + r1 - r0;
1205 qsort(isiz, n, sizeof(*isiz), int_cmp);
1210 * Grow the additional islands.
1211 * Return 1 on success, 0 on error.
1216 int *island_size = size_islands();
1217 int xzone_valid = 0;
1219 int i, j, c, done, secs, isiz, x, y;
1221 init_spheres_of_influence();
1223 for (i = 0; i < ni / nc; i++) {
1229 carry += island_size[i];
1230 isiz = MIN(2 * is, carry);
1232 for (j = 0; j < nc; j++) {
1234 if (!place_island(c + j, isiz)) {
1235 qprint("\nNo room for island #%d\n", c - nc + j + 1);
1242 for (secs = 1; secs < isiz && done; secs++) {
1243 for (j = 0; j < nc; j++) {
1244 if (!grow_one_sector(c + j))
1251 for (j = 0; j < nc; j++) {
1252 if (isecs[c + j] != secs) {
1254 assert(isecs[c + j] == secs);
1255 x = sect[c + j][secs].x;
1256 y = sect[c + j][secs].y;
1257 own[XYOFFSET(x, y)] = -1;
1258 adj_land_update(x, y);
1264 for (j = 0; j < nc; j++)
1265 qprint(" %d(%d)", c - nc + j + 1, isecs[c + j]);
1274 qprint("Only managed to grow %d out of %d island sectors.\n",
1275 is * ni - carry * nc, is * ni);
1280 /****************************************************************************
1282 ****************************************************************************/
1284 create_elevations(void)
1292 elev_cmp(const void *p, const void *q)
1296 int delev = elev[a] - elev[b];
1298 return delev ? delev : a - b;
1304 int n = WORLD_SZ() * 8;
1305 int off0, r, sign, elevation, d, x1, y1, off1;
1307 struct hexagon_iter hexit;
1309 init_distance_to_coast();
1312 off0 = roll0(WORLD_SZ());
1313 sctoff2xy(&x0, &y0, off0);
1314 if (own[off0] == -1) {
1315 r = roll(MIN(3, distance[off0]));
1318 r = roll(MIN(3, distance[off0]) + 1);
1321 elevation = elev[off0] + sign * r * r;
1322 elev[off0] = LIMIT_TO(elevation, SHRT_MIN, SHRT_MAX);
1324 for (d = 1; d < r; d++) {
1325 hexagon_first(&hexit, x0, y0, d, &x1, &y1);
1327 off1 = XYOFFSET(x1, y1);
1328 elevation = elev[off1] + sign * (r * r - d * d);
1329 elev[off1] = LIMIT_TO(elevation, SHRT_MIN, SHRT_MAX);
1331 } while (hexagon_next(&hexit, &x1, &y1));
1339 int *off = malloc(MAX(sc, is * 2) * sizeof(*off));
1340 int max_nm = (pm * MAX(sc, is * 2)) / 100;
1341 int c, nm, i0, n, i;
1342 double elevation, delta;
1344 for (c = 0; c < nc + ni; c++) {
1345 nm = (pm * isecs[c]) / 100;
1346 i0 = c < nc ? 2 : 0;
1348 for (i = 0; i < i0; i++)
1349 elev[XYOFFSET(sect[c][i].x, sect[c][i].y)] = PLATMIN;
1350 for (i = 0; i < n; i++)
1351 off[i] = XYOFFSET(sect[c][i0 + i].x, sect[c][i0 + i].y);
1352 qsort(off, n, sizeof(*off), elev_cmp);
1353 delta = (double)(HIGHMIN - LANDMIN - 1) / (n - nm - 1);
1354 elevation = LANDMIN;
1355 for (i = 0; i < n - nm; i++) {
1356 elev[off[i]] = (int)(elevation + 0.5);
1359 elevation = HIGHMIN;
1360 delta = (127.0 - HIGHMIN) / max_nm;
1361 for (; i < n; i++) {
1363 elev[off[i]] = (int)(elevation + 0.5);
1376 for (i = 0; i < WORLD_SZ(); i++) {
1381 for (i = 0; i < WORLD_SZ(); i++) {
1383 elev[i] = -1 - 126 * elev[i] / min;
1388 elev_to_sct_type(int elevation)
1390 if (elevation < LANDMIN)
1392 if (elevation < HIGHMIN)
1397 /****************************************************************************
1399 ****************************************************************************/
1402 * Map elevation @elev to a resource value according to @conf.
1403 * This is a linear interpolation on the data points in @conf.
1406 elev_to_resource(int elev, struct resource_point conf[])
1408 int i, elev1, elev2, delev, res1, res2, dres;
1410 for (i = 1; elev > conf[i].elev; i++) ;
1411 assert(conf[i - 1].elev <= elev);
1413 elev1 = conf[i - 1].elev;
1414 elev2 = conf[i].elev;
1415 delev = elev2 - elev1;
1416 res1 = conf[i - 1].res;
1419 return (int)(res1 + (double)((elev - elev1) * dres) / delev);
1423 add_resources(struct sctstr *sct)
1425 sct->sct_min = elev_to_resource(sct->sct_elev, iron_conf);
1426 sct->sct_gmin = elev_to_resource(sct->sct_elev, gold_conf);
1427 sct->sct_fertil = elev_to_resource(sct->sct_elev, fert_conf);
1428 sct->sct_oil = elev_to_resource(sct->sct_elev, oil_conf);
1429 sct->sct_uran = elev_to_resource(sct->sct_elev, uran_conf);
1432 /****************************************************************************
1433 DESIGNATE THE SECTORS
1434 ****************************************************************************/
1442 for (i = 0; i < WORLD_SZ(); i++) {
1444 sp->sct_elev = elev[i];
1445 sp->sct_type = elev_to_sct_type(sp->sct_elev);
1446 sp->sct_newtype = sp->sct_type;
1447 sp->sct_dterr = own[i] + 1;
1448 sp->sct_coastal = is_coastal(sp->sct_x, sp->sct_y);
1453 /****************************************************************************
1454 PRINT A PICTURE OF THE MAP TO YOUR SCREEN
1455 ****************************************************************************/
1459 int sx, sy, x, y, off, c, type;
1462 for (sy = -WORLD_Y / 2; sy < WORLD_Y / 2; sy++) {
1467 for (sx = -WORLD_X / 2 + y % 2; sx < WORLD_X / 2; sx += 2) {
1469 off = XYOFFSET(x, y);
1471 type = elev_to_sct_type(elev[off]);
1472 if (type == SCT_WATER)
1474 else if (type == SCT_MOUNT)
1479 assert(0 <= c && c < nc);
1480 if ((x == capx[c] || x == new_x(capx[c] + 2))
1482 printf("%c ", numletter[c % 62]);
1492 * Print a map to help visualize own[].
1493 * This is for debugging.
1498 int sx, sy, x, y, off;
1500 for (sy = -WORLD_Y / 2; sy < WORLD_Y / 2; sy++) {
1503 for (sx = -WORLD_X / 2; sx < WORLD_X / 2; sx++) {
1505 off = XYOFFSET(x, y);
1508 else if (own[off] == -1)
1511 putchar(numletter[own[off] % 62]);
1518 * Print a map to help visualize elev[].
1519 * This is for debugging. It expects the terminal to understand
1520 * 24-bit color escape sequences \e[48;2;$red;$green;$blue;m.
1523 print_elev_map(void)
1525 int sx, sy, x, y, off, sat;
1527 for (sy = -WORLD_Y / 2; sy < WORLD_Y / 2; sy++) {
1530 for (sx = -WORLD_X / 2; sx < WORLD_X / 2; sx++) {
1532 off = XYOFFSET(x, y);
1535 else if (!elev[off])
1537 else if (elev[off] < 0) {
1538 sat = 256 + elev[off] * 2;
1539 printf("\033[48;2;%d;%d;%dm \033[0m", sat, sat, 255);
1540 } else if (elev[off] < HIGHMIN / 2) {
1541 sat = (HIGHMIN / 2 - elev[off]) * 4;
1542 printf("\033[48;2;%d;%d;%dm \033[0m", sat, 255, sat);
1543 } else if (elev[off] < HIGHMIN) {
1544 sat = 128 + (HIGHMIN - elev[off]) * 2;
1545 printf("\033[48;2;%d;%d;%dm \033[0m", sat, sat / 2, sat / 4);
1547 sat = 128 + (elev[off] - HIGHMIN) * 2;
1548 printf("\033[48;2;%d;%d;%dm^\033[0m", sat, sat, sat);
1556 * Print a map to help visualize xzone[].
1557 * This is for debugging.
1560 print_xzone_map(void)
1562 int sx, sy, x, y, off;
1564 for (sy = -WORLD_Y / 2; sy < WORLD_Y / 2; sy++) {
1567 for (sx = -WORLD_X / 2; sx < WORLD_X / 2; sx++) {
1569 off = XYOFFSET(x, y);
1572 else if (own[off] >= 0)
1574 else if (xzone[off] >= 0)
1575 putchar(numletter[xzone[off] % 62]);
1577 assert(own[off] == -1);
1578 putchar(xzone[off] == -1 ? '.' : '!');
1586 * Print a map to help visualize closest[].
1587 * This is for debugging.
1590 print_closest_map(void)
1592 int sx, sy, x, y, off;
1594 for (sy = -WORLD_Y / 2; sy < WORLD_Y / 2; sy++) {
1597 for (sx = -WORLD_X / 2; sx < WORLD_X / 2; sx++) {
1599 off = XYOFFSET(x, y);
1602 else if (closest[off] == (natid)-1)
1604 else if (!distance[off]) {
1605 assert(closest[off] == own[off]);
1608 putchar(numletter[closest[off] % 62]);
1616 print_distance_map(void)
1618 int sx, sy, x, y, off;
1620 for (sy = -WORLD_Y / 2; sy < WORLD_Y / 2; sy++) {
1623 for (sx = -WORLD_X / 2; sx < WORLD_X / 2; sx++) {
1625 off = XYOFFSET(x, y);
1628 else if (closest[off] == (natid)-1)
1630 else if (!distance[off]) {
1631 assert(closest[off] == own[off]);
1634 putchar(numletter[distance[off] % 62]);
1642 /***************************************************************************
1643 WRITE A SCRIPT FOR PLACING CAPITALS
1644 ****************************************************************************/
1646 write_newcap_script(void)
1649 FILE *script = fopen(outfile, "w");
1652 fprintf(stderr, "%s: unable to write to %s (%s)\n",
1653 program_name, outfile, strerror(errno));
1657 for (c = 0; c < nc; ++c) {
1658 fprintf(script, "add %d %d %d p\n", c + 1, c + 1, c + 1);
1659 fprintf(script, "newcap %d %d,%d\n", c + 1, capx[c], capy[c]);
1661 fprintf(script, "add %d visitor visitor v\n", c + 1);
1667 qprint(const char *const fmt, ...)
1673 vfprintf(stdout, fmt, ap);