find a valid door position at room edge. dir is the preferred edge of the room. if found, returns TRUE and the coordinate in cc */
| 144 | dir is the preferred edge of the room. |
| 145 | if found, returns TRUE and the coordinate in cc */ |
| 146 | staticfn boolean |
| 147 | finddpos(coord *cc, int dir, struct mkroom *aroom) |
| 148 | { |
| 149 | coordxy x, y; |
| 150 | coordxy x1, y1, x2, y2; |
| 151 | int tryct = 0; |
| 152 | |
| 153 | switch (dir) { |
| 154 | case DIR_N: |
| 155 | x1 = aroom->lx; |
| 156 | x2 = aroom->hx; |
| 157 | y1 = aroom->ly - 1; |
| 158 | y2 = aroom->ly - 1; |
| 159 | break; |
| 160 | case DIR_S: |
| 161 | x1 = aroom->lx; |
| 162 | x2 = aroom->hx; |
| 163 | y1 = aroom->hy + 1; |
| 164 | y2 = aroom->hy + 1; |
| 165 | break; |
| 166 | case DIR_W: |
| 167 | x1 = aroom->lx - 1; |
| 168 | x2 = aroom->lx - 1; |
| 169 | y1 = aroom->ly; |
| 170 | y2 = aroom->hy; |
| 171 | break; |
| 172 | case DIR_E: |
| 173 | x1 = aroom->hx + 1; |
| 174 | x2 = aroom->hx + 1; |
| 175 | y1 = aroom->ly; |
| 176 | y2 = aroom->hy; |
| 177 | break; |
| 178 | default: |
| 179 | impossible("finddpos: illegal dir"); |
| 180 | return FALSE; |
| 181 | } |
| 182 | |
| 183 | /* try random points */ |
| 184 | do { |
| 185 | x = (x2 - x1) ? rn1(x2 - x1 + 1, x1) : x1; |
| 186 | y = (y2 - y1) ? rn1(y2 - y1 + 1, y1) : y1; |
| 187 | if (finddpos_shift(&x, &y, dir, aroom)) |
| 188 | goto gotit; |
| 189 | } while (++tryct < 20); |
| 190 | |
| 191 | /* try all the points */ |
| 192 | for (x = x1; x <= x2; x++) |
| 193 | for (y = y1; y <= y2; y++) |
| 194 | if (finddpos_shift(&x, &y, dir, aroom)) |
| 195 | goto gotit; |
| 196 | |
| 197 | /* cannot find something reasonable -- strange */ |
| 198 | cc->x = x1; |
| 199 | cc->y = y1; |
| 200 | return FALSE; |
| 201 | gotit: |
| 202 | cc->x = x; |
| 203 | cc->y = y; |
no test coverage detected