new seed/sapling/tree code, now with spread to the neighbours

src/common/gamecode/laws.c

@@ -722,14 +722,14 @@ extern struct attrib_type at_germs;
 static void
 growing_trees_e3(region * r, const int current_season, const int last_weeks_season)
 {
-  const int transform[4][3] = { 
+  const static int transform[4][3] = { 
     { -1, -1, 0 },
     { TREE_SEED, TREE_SAPLING, 2 },
     { TREE_SAPLING, TREE_TREE, 2 },
     { TREE_TREE, TREE_SEED, 2 }
   };
 
-  if (current_season!=last_weeks_season && transform[current_season][2]) {
+  if (r->land && current_season!=last_weeks_season && transform[current_season][2]) {
     int src_type = transform[current_season][0];
     int dst_type = transform[current_season][1];
     int src = rtrees(r, src_type);
@@ -737,6 +737,35 @@ growing_trees_e3(region * r, const int current_season, const int last_weeks_seas
     int grow = src/transform[current_season][2];
     rsettrees(r, src_type, src-grow);
     rsettrees(r, dst_type, dst+grow);
+
+    if (dst_type==TREE_SEED && r->terrain->size) {
+      region * rn[MAXDIRECTIONS];
+      int d, total_size = 0;
+      get_neighbours(r, rn);
+      for (d=0;d!=MAXDIRECTIONS;++d) {
+        if (rn[d] && rn[d]->land) {
+          total_size += rn[d]->terrain->size;
+        }
+      }
+      if (total_size>0) {
+        double scale = 1.0;
+        if (total_size<r->terrain->size) {
+          scale = total_size/(double)r->terrain->size;
+        }
+        for (d=0;d!=MAXDIRECTIONS;++d) {
+          region * rx = rn[d];
+          if (rx && rx->land) {
+            int size = rx->terrain->size;
+            int d = rtrees(rx, dst_type);
+            double fg = grow * scale * size / MAXDIRECTIONS / total_size;
+            int g = (int)fg;
+            double ch = fg - g;
+            if (chance(ch)) ++g;
+            rsettrees(rx, dst_type, d + g);
+          }
+        }
+      }
+    }
   }
 }
 

src/common/kernel/region.c

@@ -1503,6 +1503,15 @@ int region_get_morale(const region * r)
 void region_set_morale(region * r, int morale)
 {
   if (r->land) {
-    r->land->morale = morale;
+    r->land->morale = (short)morale;
   }
 }
+
+void get_neighbours(const region * r, region ** list)
+{
+  direction_t dir;
+  for (dir=0;dir!=MAXDIRECTIONS;++dir) {
+    list[dir] = rconnect(r, dir);
+  }
+}
+

src/common/kernel/region.h

@@ -276,7 +276,7 @@ int region_getresource(const struct region * r, const struct resource_type * rty
 void region_setresource(struct region * r, const struct resource_type * rtype, int value);
 
 extern const struct item_type * r_luxury(struct region * r);
-
+extern void get_neighbours(const struct region * r, struct region ** list);
 #ifdef __cplusplus
 }
 #endif

src/common/modules/autoseed.c

@@ -760,14 +760,6 @@ autoseed(newfaction ** players, int nsize, int max_agediff)
   return tsize;
 }
 
-static void get_neighbours(const region * r, region ** list)
-{
-  direction_t dir;
-  for (dir=0;dir!=MAXDIRECTIONS;++dir) {
-    list[dir] = rconnect(r, dir);
-  }
-}
-
 region_list * regionqueue_push(region_list ** rlist, region * r)
 {
   region_list * rnew = malloc(sizeof(region_list));