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authorrubidium <rubidium@openttd.org>2009-01-05 17:48:54 +0000
committerrubidium <rubidium@openttd.org>2009-01-05 17:48:54 +0000
commitd642a55b9126f8ac8e6a4f6736aaa621bc3e9f93 (patch)
treef94c0b77431ab62958b25332bb29340cfca272a0 /src
parentd5f311d3a2f96190674325ee64301e60f6db4f3e (diff)
downloadopenttd-d642a55b9126f8ac8e6a4f6736aaa621bc3e9f93.tar.xz
(svn r14847) -Codechange: generalise the circular search to search around a rectangle (PhilSophus)
Diffstat (limited to 'src')
-rw-r--r--src/map.cpp57
-rw-r--r--src/map_func.h5
2 files changed, 39 insertions, 23 deletions
diff --git a/src/map.cpp b/src/map.cpp
index 12f7a0266..72a4f550f 100644
--- a/src/map.cpp
+++ b/src/map.cpp
@@ -268,41 +268,52 @@ uint DistanceFromEdge(TileIndex tile)
*/
bool CircularTileSearch(TileIndex *tile, uint size, TestTileOnSearchProc proc, void *user_data)
{
- uint n, x, y;
- DiagDirection dir;
-
assert(proc != NULL);
assert(size > 0);
- x = TileX(*tile);
- y = TileY(*tile);
-
if (size % 2 == 1) {
/* If the length of the side is uneven, the center has to be checked
* separately, as the pattern of uneven sides requires to go around the center */
- n = 2;
- if (proc(TileXY(x, y), user_data)) {
- *tile = TileXY(x, y);
- return true;
- }
+ if (proc(*tile, user_data)) return true;
/* If tile test is not successful, get one tile down and left,
* ready for a test in first circle around center tile */
- x += _tileoffs_by_dir[DIR_W].x;
- y += _tileoffs_by_dir[DIR_W].y;
+ *tile = TILE_ADD(*tile, TileOffsByDir(DIR_W));
+ return CircularTileSearch(tile, size / 2, 1, 1, proc, user_data);
} else {
- n = 1;
- /* To use _tileoffs_by_diagdir's order, we must relocate to
- * another tile, as we now first go 'up', 'right', 'down', 'left'
- * instead of 'right', 'down', 'left', 'up', which the calling
- * function assume. */
- x++;
+ return CircularTileSearch(tile, size / 2, 0, 0, proc, user_data);
}
+}
+
+/*!
+ * Generalized circular search allowing for rectangles and a hole.
+ * Function performing a search around a center rectangle and going outward.
+ * The center rectangle is left out from the search. To do a rectangular search
+ * without a hole, set either h or w to zero.
+ * Every tile will be tested by means of the callback function proc,
+ * which will determine if yes or no the given tile meets criteria of search.
+ * @param tile to start the search from. Upon completion, it will return the tile matching the search
+ * @param radius: How many tiles to search outwards. Note: This is a radius and thus different
+ * from the size parameter of the other CircularTileSearch function, which is a diameter.
+ * @param proc: callback testing function pointer.
+ * @param user_data to be passed to the callback function. Depends on the implementation
+ * @return result of the search
+ * @pre proc != NULL
+ * @pre radius > 0
+ */
+bool CircularTileSearch(TileIndex *tile, uint radius, uint w, uint h, TestTileOnSearchProc proc, void *user_data)
+{
+ assert(proc != NULL);
+ assert(radius > 0);
+
+ uint x = TileX(*tile) + w + 1;
+ uint y = TileY(*tile);
+
+ uint extent[DIAGDIR_END] = { w, h, w, h };
- for (; n < size; n += 2) {
- for (dir = DIAGDIR_NE; dir < DIAGDIR_END; dir++) {
- uint j;
- for (j = n; j != 0; j--) {
+ for (uint n = 0; n < radius; n++) {
+ for (DiagDirection dir = DIAGDIR_NE; dir < DIAGDIR_END; dir++) {
+ for (uint j = extent[dir] + n * 2 + 1; j != 0; j--) {
if (x <= MapMaxX() && y <= MapMaxY() && ///< Is the tile within the map?
proc(TileXY(x, y), user_data)) { ///< Is the callback successful?
*tile = TileXY(x, y);
diff --git a/src/map_func.h b/src/map_func.h
index ff539b8af..2a971d1d6 100644
--- a/src/map_func.h
+++ b/src/map_func.h
@@ -394,6 +394,11 @@ typedef bool TestTileOnSearchProc(TileIndex tile, void *user_data);
bool CircularTileSearch(TileIndex *tile, uint size, TestTileOnSearchProc proc, void *user_data);
/**
+ * Searches for some cirumstances of a tile around a given rectangle with a helper function.
+ */
+bool CircularTileSearch(TileIndex *tile, uint radius, uint w, uint h, TestTileOnSearchProc proc, void *user_data);
+
+/**
* Get a random tile out of a given seed.
* @param r the random 'seed'
* @return a valid tile