Function PlaceTree

src/tree_cmd.cpp:161–178

* Make a random tree tile of the given tile * * Create a new tree-tile for the given tile. The second parameter is used for * randomness like type and number of trees. * * @param tile The tile to make a tree-tile from * @param r The randomness value from a Random() value * @param keep_density Whether to keep the existing ground density of the tile. */

 * @param keep_density Whether to keep the existing ground density of the tile.
 */
void PlaceTree(TileIndex tile, uint32_t r, bool keep_density)
{
	TreeType tree = GetRandomTreeType(tile, GB(r, 24, 8));

	if (tree != TREE_INVALID) {
		PlantTreesOnTile(tile, tree, GB(r, 22, 2), static_cast<TreeGrowthStage>(std::min<uint8_t>(GB(r, 16, 3), 6)));
		MarkTileDirtyByTile(tile);

		/* Maybe keep the existing ground density.*/
		if (keep_density) return;

		/* Rerandomize ground, if neither snow nor shore */
		TreeGround ground = GetTreeGround(tile);
		if (ground != TREE_GROUND_SNOW_DESERT && ground != TREE_GROUND_ROUGH_SNOW && ground != TREE_GROUND_SHORE) {
			SetTreeGroundDensity(tile, (TreeGround)GB(r, 28, 1), 3);
		}
	}
}

struct BlobHarmonic {
	int amplitude;