static int diry[] = { 0, -1, -1, 0, 1, 1 };
static int **own; /* owner of the sector. -1 means water */
+
+/*
+ * Adjacent land sectors
+ * adj_land[XYOFFSET(x, y)] bit d is set exactly when the sector next
+ * to x, y in direction d is land.
+ */
+static unsigned char *adj_land;
+
+/*
+ * Exclusive zones
+ * Each island is surrounded by an exclusive zone where only it may
+ * grow. The width of the zone depends on minimum distances.
+ * While growing continents, it is @di sectors wide.
+ * While growing additional islands, it is @id sectors wide.
+ * DISTINCT_ISLANDS nullifies the exclusive zone then.
+ * xzone[XYOFFSET(x, y)] is -1 when the sector is in no exclusive
+ * zone, a (non-negative) island number when it is in that island's
+ * exclusive zone and no other, and -2 when it is in multiple
+ * exclusive zones.
+ */
+static short *xzone;
+
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? */
/* Debugging aids: */
void print_own_map(void);
+void print_xzone_map(void);
void print_elev_map(void);
/****************************************************************************
capx = calloc(nc, sizeof(int));
capy = calloc(nc, sizeof(int));
own = calloc(WORLD_X, sizeof(int *));
+ adj_land = malloc(WORLD_SZ() * sizeof(*adj_land));
+ xzone = malloc(WORLD_SZ() * sizeof(*xzone));
elev = calloc(WORLD_X, sizeof(int *));
for (i = 0; i < WORLD_X; ++i) {
own[i] = calloc(WORLD_Y, sizeof(int));
own[i][j] = -1;
}
}
+ memset(adj_land, 0, WORLD_SZ() * sizeof(*adj_land));
}
/****************************************************************************
return iter->dir <= DIR_LAST;
}
+/*
+ * Is @x,@y in no exclusive zone other than perhaps @c's?
+ */
static int
-try_to_grow(int c, int newx, int newy, int extra_dist)
+xzone_ok(int c, int x, int y)
{
- int d = (c < nc ? di : id) + extra_dist;
- int i, px, py;
+ int off = XYOFFSET(x, y);
+
+ return xzone[off] == c || xzone[off] == -1;
+}
+
+/*
+ * Add sectors within distance @dist of @x,@y to @c's exclusive zone.
+ */
+static void
+xzone_around_sector(int c, int x, int y, int dist)
+{
+ int d, x1, y1, off;
struct hexagon_iter hexit;
- if (own[newx][newy] != -1)
- return 0;
+ assert(xzone_ok(c, x, y));
- for (i = 1; i <= d; ++i) {
- hexagon_first(&hexit, newx, newy, i, &px, &py);
+ xzone[XYOFFSET(x, y)] = c;
+ for (d = 1; d <= dist; d++) {
+ hexagon_first(&hexit, x, y, d, &x1, &y1);
do {
- if (own[px][py] != -1 &&
- own[px][py] != c &&
- (DISTINCT_ISLANDS || own[px][py] < nc))
- return 0;
- } while (hexagon_next(&hexit, &px, &py));
+ off = XYOFFSET(x1, y1);
+ if (xzone[off] == -1)
+ xzone[off] = c;
+ else if (xzone[off] != c)
+ xzone[off] = -2;
+ } while (hexagon_next(&hexit, &x1, &y1));
}
- sectx[c][isecs[c]] = newx;
- secty[c][isecs[c]] = newy;
+}
+
+/*
+ * Add sectors within distance @dist to island @c's exclusive zone.
+ */
+static void
+xzone_around_island(int c, int dist)
+{
+ int i;
+
+ for (i = 0; i < isecs[c]; i++)
+ xzone_around_sector(c, sectx[c][i], secty[c][i], dist);
+}
+
+/*
+ * Initialize exclusive zones around @n islands.
+ */
+static void
+xzone_init(int n)
+{
+ int i, c;
+
+ for (i = 0; i < WORLD_SZ(); i++)
+ xzone[i] = -1;
+
+ for (c = 0; c < n; c++)
+ xzone_around_island(c, id);
+}
+
+/*
+ * 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);
+}
+
+static void
+adj_land_update(int x, int y)
+{
+ 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);
+ }
+}
+
+static void
+add_sector(int c, int x, int y)
+{
+ assert(own[x][y] == -1);
+ xzone_around_sector(c, x, y, c < nc ? di : DISTINCT_ISLANDS ? id : 0);
+ sectx[c][isecs[c]] = x;
+ secty[c][isecs[c]] = y;
isecs[c]++;
- own[newx][newy] = c;
+ own[x][y] = c;
+ adj_land_update(x, y);
+}
+
+static int
+try_to_grow(int c, int newx, int newy)
+{
+ if (!can_grow_at(c, newx, newy))
+ return 0;
+
+ add_sector(c, newx, newy);
return 1;
}
if (n > 5 ||
(own[new_x(x+dirx[(i+5)%6])][new_y(y+diry[(i+5)%6])] == -1 &&
own[new_x(x+dirx[(i+1)%6])][new_y(y+diry[(i+1)%6])] == -1))
- if (try_to_grow(c, newx, newy, 0))
+ if (try_to_grow(c, newx, newy))
done = 1;
}
} else
for (i = roll0(6), n = 0; n < 6 && !done; i = (i + 1) % 6, ++n) {
newx = new_x(x + dirx[i]);
newy = new_y(y + diry[i]);
- if (try_to_grow(c, newx, newy, 0))
+ if (try_to_grow(c, newx, newy))
done = 1;
}
next_coast(c, x, y, &x, &y);
int done = 1;
int c, secs;
+ ctot = 0;
+ xzone_init(0);
+
for (c = 0; c < nc; ++c) {
isecs[c] = 0;
- if (!try_to_grow(c, capx[c], capy[c], 0)
- || !try_to_grow(c, new_x(capx[c] + 2), capy[c], 0)) {
+ if (!try_to_grow(c, capx[c], capy[c])
+ || !try_to_grow(c, new_x(capx[c] + 2), capy[c])) {
done = 0;
continue;
}
GROW THE ISLANDS
****************************************************************************/
-/* Choose a place to start growing an island from
-*/
+/*
+ * Place additional island @c's first sector.
+ * Return 1 on success, 0 on error.
+ */
static int
-place_island(int c, int *xp, int *yp)
+place_island(int c)
{
- int d, sx, sy;
- int ssy = roll0(WORLD_Y);
- int ssx = new_x(roll0(WORLD_X / 2) * 2 + ssy % 2);
-
- if (ssx > WORLD_X - 2)
- ssx = new_x(ssx + 2);
- for (d = di; d >= 0; --d) {
- sx = ssx;
- sy = ssy;
- *xp = new_x(sx + 2);
- for (*yp = sy; *xp != sx || *yp != sy; *xp += 2) {
- if (*xp >= WORLD_X) {
- *yp = new_y(*yp + 1);
- *xp = *yp % 2;
- if (*xp == sx && *yp == sy)
- break;
+ int n, x, y, newx, newy;
+
+ n = 0;
+
+ for (y = 0; y < WORLD_Y; y++) {
+ for (x = y % 2; x < WORLD_X; x += 2) {
+ if (can_grow_at(c, x, y)) {
+ n++;
+ if (!roll0(n)) {
+ newx = x;
+ newy = y;
+ }
}
- if (try_to_grow(c, *xp, *yp, d))
- return 1;
}
}
- return 0;
+
+ if (n)
+ add_sector(c, newx, newy);
+ return n;
}
/* Grow all the islands
grow_islands(void)
{
int stunted_islands = 0;
- int c, secs, x, y, isiz;
+ int c, secs, isiz;
+
+ xzone_init(nc);
for (c = nc; c < nc + ni; ++c) {
- if (!place_island(c, &x, &y)) {
+ if (!place_island(c)) {
qprint("\nNo room for island #%d", c - nc + 1);
break;
}
}
}
+/*
+ * Print a map to help visualize xzone[].
+ * This is for debugging.
+ */
+void
+print_xzone_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 (own[x][y] >= 0)
+ putchar('-');
+ else if (xzone[off] >= 0)
+ putchar(numletter[xzone[off] % 62]);
+ else {
+ assert(own[x][y] == -1);
+ putchar(xzone[off] == -1 ? '.' : '!');
+ }
+ }
+ putchar('\n');
+ }
+}
+
+
/***************************************************************************
WRITE A SCRIPT FOR PLACING CAPITALS
****************************************************************************/
projects / empserver / blobdiff