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we prefer get_neighbours over rconnect

This commit is contained in:
Enno Rehling 2019-08-26 22:46:59 +02:00
parent 331546eec4
commit a5e59a6464
1 changed files with 22 additions and 24 deletions
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46
src/kernel/pathfinder.c
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@ -145,47 +145,45 @@ static region **internal_path_find(region * handle_start, const region * target,
node *root = new_node(handle_start, 0, NULL);
node **handle_end = &root->next;
node *n = root;
bool found = false;
assert(maxlen <= MAXDEPTH);
fset(handle_start, RF_MARK);
while (n != NULL) {
region *adj[MAXDIRECTIONS];
region *r = n->r;
int depth = n->distance + 1;
if (n->distance >= maxlen)
break;
get_neighbours(r, adj);
for (d = 0; d != MAXDIRECTIONS; ++d) {
region *rn = rconnect(r, d);
if (rn == NULL)
continue;
if (fval(rn, RF_MARK))
continue; /* already been there */
if (!allowed(r, rn))
continue; /* can't go there */
if (rn == target) {
int i = depth;
path[i + 1] = NULL;
path[i] = rn;
while (n) {
path[--i] = n->r;
n = n->prev;
region *rn = adj[d];
if (rn && !fval(rn, RF_MARK) && allowed(r, rn)) {
if (rn == target) {
int i = depth;
path[i + 1] = NULL;
path[i] = rn;
while (n) {
path[--i] = n->r;
n = n->prev;
}
break;
}
else {
fset(rn, RF_MARK);
*handle_end = new_node(rn, depth, n);
handle_end = &(*handle_end)->next;
}
found = true;
break;
}
else {
fset(rn, RF_MARK);
*handle_end = new_node(rn, depth, n);
handle_end = &(*handle_end)->next;
}
}
if (found)
if (d != MAXDIRECTIONS) {
break;
}
n = n->next;
}
free_nodes(root);
if (found)
if (n) {
return path;
}
return NULL;
}