void dijkstra_distance_target(grid *distances, grid *target, const pos *targets, int count, int neighbors, cost_function_t cost_function, void *userdata){
grid_fill(distances, distances->x0, distances->y0, distances->width, distances->height, DBL_MAX);
if(target != NULL) grid_fill(target, target->x0, target->y0, target->width, target->height, -1);
queue open_set = queue_create(sizeof(pos));
for(int i = 0;i<count;++i) {
grid_set(distances, targets[i].x, targets[i].y, 0.0);
if(target != NULL) grid_set(target, targets[i].x, targets[i].y, i);
queue_push(&open_set, targets+i);
}
while(!queue_empty(&open_set)) {
pos cur = *(pos*)queue_front(&open_set);
double curdist = grid_get(distances, cur.x, cur.y);
queue_pop(&open_set);
for(int i = 0;i<neighbors;++i) {
pos neigh = {cur.x+offsets[i].x, cur.y+offsets[i].y};
if(!grid_contains(distances, neigh.x, neigh.y)) continue;
double neighdist = grid_get(distances, neigh.x, neigh.y);
double cost = cost_function(cur.x, cur.y, neigh.x, neigh.y, userdata);
if(neighdist > curdist + cost) {
grid_set(distances, neigh.x, neigh.y, curdist + cost);
if(target != NULL) grid_set(target, neigh.x, neigh.y, grid_get(target, cur.x, cur.y));
queue_push(&open_set, &neigh);
}
}
}
queue_destroy(open_set);
}
struct grid_t *init_grid_from_random()
{
struct grid_t *grid;
int cols, rows, i, j;
srandom(time(NULL));
/* TODO range */
cols = random() % 21 + 40;
rows = random() % 21 + 40;
grid = grid_init(rows, cols);
grid_fill(grid, 0);
for (i = 0;i < rows;i++)
for (j = 0;j < cols;j++)
grid_set(grid, i, j, random() % 2);
return grid;
}
static int grid_fill_lua(lua_State *L) {
int top = lua_gettop(L);
if(top<1) return typerror(L, 1, "grid");
if(top<2 || !lua_isnumber(L, 2)) return typerror(L, 2, "number");
if(top>2) {
if(top<3 || !lua_isnumber(L, 3)) return typerror(L, 3, "number");
if(top<4 || !lua_isnumber(L, 4)) return typerror(L, 4, "number");
if(top<5 || !lua_isnumber(L, 5)) return typerror(L, 5, "number");
if(top<6 || !lua_isnumber(L, 6)) return typerror(L, 6, "number");
}
grid *g = lua_touserdata(L, 1);
int x = top==2?g->x0:lua_tointeger(L, 2);
int y = top==2?g->y0:lua_tointeger(L, 3);
int width = top==2?g->width:lua_tointeger(L, 4);
int height = top==2?g->height:lua_tointeger(L, 5);
double value = top==2?lua_tonumber(L, 2):lua_tonumber(L, 6);
grid_fill(g, x, y, width, height, value);
return 0;
}
struct grid_t *init_grid_from_file(char *fname, int max_cols, \
char comment, char alive, char dead)
{
struct grid_t *grid;
FILE *stream;
int cols, rows, counter;
char *line, *c;
stream = fopen(fname, "r");
assert(stream != NULL);
line = malloc(sizeof(char) * max_cols);
cols = -1;
rows = -1;
counter = 0;
for(;getline(&line, (size_t *) &max_cols, stream) != -1;) {
if (line[0] != comment) {
if (rows == -1) {
rows = atoi(line);
assert(rows != -1);
} else if (cols == -1) {
cols = atoi(line);
assert(cols != -1);
grid = grid_init(rows, cols);
grid_fill(grid, 0);
} else if (counter < rows * cols) {
/* read the grid */
assert(rows != -1 && cols != -1);
for (c = line;*c != '\n' && *c != EOF;c++, counter++)
grid_set(grid, counter / cols, counter % cols,\
(*c == alive) ? (1) : (0));
}
}
}
assert(rows != -1 && cols != -1 && grid != NULL);
fclose(stream);
return grid;
}
