public void floodFill()
{
// Use a stack instead of recursion
Stack <Tile> stack = new Stack <Tile>();
for (int x = 0; x < WorldParameters.theRegionSize; x++)
{
for (int y = 0; y < WorldParameters.theRegionSize; y++)
{
Tile t = myTiles[x, y];
//Tile already flood filled, skip
if (t.myFloodFilled)
{
continue;
}
// Land
if (t.myIsLand)
{
TileGroup group = new TileGroup();
group.myType = TileGroupType.Land;
stack.Push(t);
while (stack.Count > 0)
{
floodFill(stack.Pop(), ref group, ref stack);
}
if (group.myTiles.Count > 0)
{
myLands.Add(group);
}
}
// Water
else
{
TileGroup group = new TileGroup();
group.myType = TileGroupType.Water;
stack.Push(t);
while (stack.Count > 0)
{
floodFill(stack.Pop(), ref group, ref stack);
}
if (group.myTiles.Count > 0)
{
myWaters.Add(group);
}
}
}
}
}
void floodFill(Tile tile, ref TileGroup tiles, ref Stack <Tile> stack)
{
// Validate
if (tile == null)
{
return;
}
if (tile.myFloodFilled)
{
return;
}
if (tiles.myType == TileGroupType.Land && !tile.myIsLand)
{
return;
}
if (tiles.myType == TileGroupType.Water && tile.myIsLand)
{
return;
}
// Add to TileGroup
tiles.myTiles.Add(tile);
tile.myFloodFilled = true;
// floodfill into neighbors
Tile t = getTop(tile);
if (t != null && !t.myFloodFilled && tile.myIsLand == t.myIsLand)
{
stack.Push(t);
}
t = getBottom(tile);
if (t != null && !t.myFloodFilled && tile.myIsLand == t.myIsLand)
{
stack.Push(t);
}
t = getLeft(tile);
if (t != null && !t.myFloodFilled && tile.myIsLand == t.myIsLand)
{
stack.Push(t);
}
t = getRight(tile);
if (t != null && !t.myFloodFilled && tile.myIsLand == t.myIsLand)
{
stack.Push(t);
}
}