*
* 3. Place and grow additional islands
*
- * Place and grow islands one after the other. Place the first sector
- * randomly, pick an island size, then grow the island to that size.
+ * Each continent has a "sphere of influence": the set of sectors
+ * closer to it than to any other continent. Each island is entirely
+ * in one such sphere, and each sphere contains the same number of
+ * islands with the same sizes.
+ *
+ * First, split the specified number of island sectors per continent
+ * randomly into the island sizes. Sort by size so that larger
+ * islands are grown before smaller ones, to give the large ones the
+ * best chance to grow to their planned size.
+ *
+ * Then place one island's first sector into each sphere, randomly.
+ * Add one sector to each island in turn, until they have the intended
+ * size. Repeat until the specified number of islands has been grown.
+ *
+ * If placement fails due to lack of room, start over, just like for
+ * continents.
*
* Growing works as for continents, except the minimum distance for
- * additional islands applies, and growing simply stops when there is
- * no room.
+ * additional islands applies, and growing simply stops when any of
+ * the islands being grown lacks the room to grow further. The number
+ * of sectors not grown carries over to the next island size.
*
* 4. Compute elevation
*
#define new_x(newx) (((newx) + WORLD_X) % WORLD_X)
#define new_y(newy) (((newy) + WORLD_Y) % WORLD_Y)
-static int ctot; /* total number of continents and islands grown */
-static int *isecs; /* array of how large each island is */
+/*
+ * Island sizes
+ * isecs[i] is the size of the i-th island.
+ */
+static int *isecs;
static int *capx, *capy; /* location of the nc capitals */
static unsigned *seen;
static unsigned cur_seen;
+/*
+ * Closest continent and "distance"
+ * closest[XYOFFSET(x, y)] is the closest continent's number.
+ * distance[] is complicated; see init_spheres_of_influence().
+ */
+static natid *closest;
+static unsigned short *distance;
+
+/*
+ * Queue for breadth-first search
+ */
+static int *bfs_queue;
+static int bfs_queue_head, bfs_queue_tail;
+
static int **elev; /* elevation of the sectors */
static int **sectx, **secty; /* the sectors for each continent */
static int **sectc; /* which sectors are on the coast? */
static void print_vars(void);
static void fl_move(int);
-static void grow_islands(void);
+static int grow_islands(void);
/* Debugging aids: */
void print_own_map(void);
void print_xzone_map(void);
+void print_closest_map(void);
+void print_distance_map(void);
void print_elev_map(void);
/****************************************************************************
qprint("unstable drift\n");
qprint("growing continents...\n");
done = grow_continents();
+ if (!done)
+ continue;
+ qprint("growing islands:");
+ done = grow_islands();
} while (!done && ++try < NUMTRIES);
if (!done) {
- fprintf(stderr, "%s: world not large enough to hold continents\n",
+ fprintf(stderr, "%s: world not large enough for this much land\n",
program_name);
exit(1);
}
- qprint("growing islands:");
- grow_islands();
- qprint("\nelevating land...\n");
+ qprint("elevating land...\n");
create_elevations();
qprint("writing to sectors file...\n");
program_name);
exit(1);
}
+ if (ni % nc) {
+ fprintf(stderr, "%s: number of islands must be a multiple of"
+ " the number of continents\n",
+ program_name);
+ exit(1);
+ }
if (argc > 3)
is = atoi(argv[3]);
adj_land = malloc(WORLD_SZ() * sizeof(*adj_land));
xzone = malloc(WORLD_SZ() * sizeof(*xzone));
seen = calloc(WORLD_SZ(), sizeof(*seen));
+ closest = malloc(WORLD_SZ() * sizeof(*closest));
+ distance = malloc(WORLD_SZ() * sizeof(*distance));
+ bfs_queue = malloc(WORLD_SZ() * sizeof(*bfs_queue));
elev = calloc(WORLD_X, sizeof(int *));
for (i = 0; i < WORLD_X; ++i) {
own[i] = calloc(WORLD_Y, sizeof(int));
xzone_around_island(c, id);
}
+/*
+ * Initialize breadth-first search.
+ */
+static void
+bfs_init(void)
+{
+ int i;
+
+ for (i = 0; i < WORLD_SZ(); i++) {
+ closest[i] = -1;
+ distance[i] = USHRT_MAX;
+ }
+
+ bfs_queue_head = bfs_queue_tail = 0;
+}
+
+/*
+ * Add sector @x,@y to the BFS queue.
+ * It's closest to @c, with distance @dist.
+ */
+static void
+bfs_enqueue(int c, int x, int y, int dist)
+{
+ int off = XYOFFSET(x, y);
+
+ assert(dist < distance[off]);
+ closest[off] = c;
+ distance[off] = dist;
+ bfs_queue[bfs_queue_tail] = off;
+ bfs_queue_tail++;
+ if (bfs_queue_tail >= WORLD_SZ())
+ bfs_queue_tail = 0;
+ assert(bfs_queue_tail != bfs_queue_head);
+}
+
+/*
+ * Search breadth-first until the queue is empty.
+ */
+static void
+bfs_run_queue(void)
+{
+ int off, dist, i, noff, nx, ny;
+ coord x, y;
+
+ while (bfs_queue_head != bfs_queue_tail) {
+ off = bfs_queue[bfs_queue_head];
+ bfs_queue_head++;
+ if (bfs_queue_head >= WORLD_SZ())
+ bfs_queue_head = 0;
+ dist = distance[off] + 1;
+ sctoff2xy(&x, &y, off);
+ for (i = DIR_FIRST; i <= DIR_LAST; i++) {
+ nx = new_x(x + diroff[i][0]);
+ ny = new_y(y + diroff[i][1]);
+ noff = XYOFFSET(nx, ny);
+ if (dist < distance[noff]) {
+ bfs_enqueue(closest[off], nx, ny, dist);
+ } else if (distance[noff] == dist) {
+ if (closest[off] != closest[noff])
+ closest[noff] = (natid)-1;
+ } else
+ assert(distance[noff] < dist);
+ }
+ }
+}
+
+/*
+ * Add island @c's coastal sectors to the BFS queue, with distance 0.
+ */
+static void
+bfs_enqueue_island(int c)
+{
+ int i;
+
+ for (i = 0; i < isecs[c]; i++) {
+ if (sectc[c][i])
+ bfs_enqueue(c, sectx[c][i], secty[c][i], 0);
+ }
+}
+
+/*
+ * Compute spheres of influence
+ * A continent's sphere of influence is the set of sectors closer to
+ * it than to any other continent.
+ * Set closest[XYOFFSET(x, y)] to the closest continent's number,
+ * -1 if no single continent is closest.
+ * Set distance[XYOFFSET(x, y)] to the distance to the closest coastal
+ * land sector.
+ */
+static void
+init_spheres_of_influence(void)
+{
+ int c;
+
+ bfs_init();
+ for (c = 0; c < nc; c++)
+ bfs_enqueue_island(c);
+ bfs_run_queue();
+}
+
+/*
+ * Is @x,@y in the same sphere of influence as island @c?
+ * Always true when @c is a continent.
+ */
+static int
+is_in_sphere(int c, int x, int y)
+{
+ return c < nc || closest[XYOFFSET(x, y)] == c % nc;
+}
+
/*
* Can island @c grow at @x,@y?
*/
static int
can_grow_at(int c, int x, int y)
{
- return own[x][y] == -1 && xzone_ok(c, x, y);
+ return own[x][y] == -1 && xzone_ok(c, x, y) && is_in_sphere(c, x, y);
}
static void
adj_land_update(int x, int y)
{
+ int is_land = own[x][y] != -1;
int dir, nx, ny, noff;
- assert(own[x][y] != -1);
-
for (dir = DIR_FIRST; dir <= DIR_LAST; dir++) {
nx = new_x(x + diroff[dir][0]);
ny = new_y(y + diroff[dir][1]);
noff = XYOFFSET(nx, ny);
- adj_land[noff] |= 1u << DIR_BACK(dir);
+ if (is_land)
+ adj_land[noff] |= 1u << DIR_BACK(dir);
+ else
+ adj_land[noff] &= ~(1u << DIR_BACK(dir));
}
}
int done = 1;
int c, secs;
- ctot = 0;
xzone_init(0);
for (c = 0; c < nc; ++c) {
if (!done)
qprint("Only managed to grow %d out of %d sectors.\n",
secs - 1, sc);
- ctot = nc;
return done;
}
return n;
}
-/* Grow all the islands
-*/
+static int
+int_cmp(const void *a, const void *b)
+{
+ return *(int *)b - *(int *)a;
+}
-static void
+static int *
+size_islands(void)
+{
+ int n = ni / nc;
+ int *isiz = malloc(n * sizeof(*isiz));
+ int r0, r1, i;
+
+ isiz[0] = n * is;
+ r1 = roll0(is);
+ for (i = 1; i < n; i++) {
+ r0 = r1;
+ r1 = roll0(is);
+ isiz[i] = is + r1 - r0;
+ isiz[0] -= isiz[i];
+ }
+
+ qsort(isiz, n, sizeof(*isiz), int_cmp);
+ return isiz;
+}
+
+/*
+ * Grow the additional islands.
+ * Return 1 on success, 0 on error.
+ */
+static int
grow_islands(void)
{
- int stunted_islands = 0;
- int c, secs, isiz;
+ int *island_size = size_islands();
+ int xzone_valid = 0;
+ int carry = 0;
+ int i, j, c, done, secs, isiz, x, y;
- xzone_init(nc);
+ init_spheres_of_influence();
- for (c = nc; c < nc + ni; ++c) {
- if (!place_island(c)) {
- qprint("\nNo room for island #%d", c - nc + 1);
- break;
+ for (i = 0; i < ni / nc; i++) {
+ c = nc + i * nc;
+
+ if (!xzone_valid)
+ xzone_init(c);
+
+ carry += island_size[i];
+ isiz = MIN(2 * is, carry);
+
+ for (j = 0; j < nc; j++) {
+ isecs[c + j] = 0;
+ if (!place_island(c + j)) {
+ qprint("\nNo room for island #%d\n", c - nc + j + 1);
+ free(island_size);
+ return 0;
+ }
}
- isiz = roll(is) + roll0(is);
- for (secs = 1; secs < isiz; secs++) {
- if (!grow_one_sector(c)) {
- stunted_islands++;
- break;
+ done = 1;
+ for (secs = 1; secs < isiz && done; secs++) {
+ for (j = 0; j < nc; j++) {
+ if (!grow_one_sector(c + j))
+ done = 0;
}
}
- find_coast(c);
- qprint(" %d(%d)", c - nc + 1, secs);
- ctot++;
+ if (!done) {
+ secs--;
+ for (j = 0; j < nc; j++) {
+ if (isecs[c + j] != secs) {
+ isecs[c + j]--;
+ assert(isecs[c + j] == secs);
+ x = sectx[c + j][secs];
+ y = secty[c + j][secs];
+ own[x][y] = -1;
+ adj_land_update(x, y);
+ }
+ }
+ xzone_valid = 0;
+ }
+
+ for (j = 0; j < nc; j++)
+ qprint(" %d(%d)", c - nc + j + 1, isecs[c + j]);
+
+ carry -= secs;
}
- if (stunted_islands)
- qprint("\n%d stunted island%s",
- stunted_islands, splur(stunted_islands));
+ free(island_size);
+ qprint("\n");
+
+ if (carry)
+ qprint("Only managed to grow %d out of %d island sectors.\n",
+ is * ni - carry * nc, is * ni);
+
+ for (c = nc; c < nc + ni; c++)
+ find_coast(c);
+
+ return 1;
}
/****************************************************************************
int i, mountain_search, k, c, total, ns, nm, highest, where, h, newk,
r, dk;
- for (c = 0; c < ctot; ++c) {
+ for (c = 0; c < nc + ni; ++c) {
total = 0;
ns = isecs[c];
nm = (pm * ns) / 100;
}
}
+/*
+ * Print a map to help visualize closest[].
+ * This is for debugging.
+ */
+void
+print_closest_map(void)
+{
+ int sx, sy, x, y, off;
+
+ for (sy = -WORLD_Y / 2; sy < WORLD_Y / 2; sy++) {
+ y = YNORM(sy);
+ printf("%4d ", sy);
+ for (sx = -WORLD_X / 2; sx < WORLD_X / 2; sx++) {
+ x = XNORM(sx);
+ off = XYOFFSET(x, y);
+ if ((x + y) & 1)
+ putchar(' ');
+ else if (closest[off] == (natid)-1)
+ putchar('.');
+ else if (!distance[off]) {
+ assert(closest[off] == own[x][y]);
+ putchar('-');
+ } else {
+ putchar(numletter[closest[off] % 62]);
+ }
+ }
+ printf("\n");
+ }
+}
+
+void
+print_distance_map(void)
+{
+ int sx, sy, x, y, off;
+
+ for (sy = -WORLD_Y / 2; sy < WORLD_Y / 2; sy++) {
+ y = YNORM(sy);
+ printf("%4d ", sy);
+ for (sx = -WORLD_X / 2; sx < WORLD_X / 2; sx++) {
+ x = XNORM(sx);
+ off = XYOFFSET(x, y);
+ if ((x + y) & 1)
+ putchar(' ');
+ else if (closest[off] == (natid)-1)
+ putchar('.');
+ else if (!distance[off]) {
+ assert(closest[off] == own[x][y]);
+ putchar('-');
+ } else {
+ putchar(numletter[distance[off] % 62]);
+ }
+ }
+ printf("\n");
+ }
+}
+
/***************************************************************************
WRITE A SCRIPT FOR PLACING CAPITALS
projects / empserver / blobdiff