Function Map_UpdateAround

src/map.c:1028–1107

* Around a position, run a certain function for all tiles within a certain radius. * * @note Radius is in a 1/4th of a tile unit. * * @param radius The radius of the to-update tiles. * @param position The position to go from. * @param unit The unit to update for (can be NULL if function < 2). * @param function The function to call. */

 * @param function The function to call.
 */
void Map_UpdateAround(uint16 radius, tile32 position, Unit *unit, uint8 function)
{
	static const uint16 tileOffsets[] = {
		0x0080, 0x0088, 0x0090, 0x0098,
		0x00A0, 0x00A8, 0x00B0, 0x00B8,
		0x00C0, 0x00C8, 0x00D0, 0x00D8,
		0x00E0, 0x00E8, 0x00F0, 0x00F8,
		0x0100, 0x0180
	};

	int16 i, j;
	tile32 diff;
	uint16 lastPacked;

	if (radius == 0 || (position.x == 0 && position.y == 0)) return;

	radius--;

	/* If radius is bigger or equal than 32, update all tiles in a 5x5 grid around the unit. */
	if (radius >= 32) {
		uint16 x = Tile_GetPosX(position);
		uint16 y = Tile_GetPosY(position);

		for (i = -2; i <= 2; i++) {
			for (j = -2; j <= 2; j++) {
				uint16 curPacked;

				if (x + i < 0 || x + i >= 64 || y + j < 0 || y + j >= 64) continue;

				curPacked = Tile_PackXY(x + i, y + j);
				BitArray_Set(g_dirtyViewport, curPacked);
				g_dirtyViewportCount++;

				switch (function) {
					case 0: Map_Update(curPacked, 0, false); break;
					case 1: Map_Update(curPacked, 3, false); break;
					case 2: Unit_RemoveFromTile(unit, curPacked); break;
					case 3: Unit_AddToTile(unit, curPacked); break;
					default: break;
				}
			}
		}
		return;
	}

	radius = max(radius, 15);
	position.x -= tileOffsets[radius - 15];
	position.y -= tileOffsets[radius - 15];

	diff.x = 0;
	diff.y = 0;
	lastPacked = 0;

	i = 0;
	do {
		tile32 curTile = Tile_AddTileDiff(position, diff);

		if (Tile_IsValid(curTile)) {