List <Tilemap> allMaps; // including those without uninitialized tile data.
public TileRef[] GetTiles(Rectangle screenRectangle)
{
Tilemap[] tileChunks;
screenRectangle.X += CellWidth / 2;
screenRectangle.Y += CellHeight / 2;
Point topLeft = new Point(screenRectangle.X, screenRectangle.Y);
Point bottomRight = new Point(screenRectangle.Right, screenRectangle.Bottom);
Tilemap topLeftChunk = ScreenToChunk(topLeft, camera);
Tilemap bottomRightChunk = ScreenToChunk(bottomRight, camera);
int numberOfTiles = (screenRectangle.Width / CellWidth) * (screenRectangle.Height / CellHeight);
if (topLeftChunk == bottomRightChunk)
{
tileChunks = new Tilemap[1];
tileChunks[0] = topLeftChunk;
}
else
{
int numberOfChunks = (screenRectangle.Width / SizeInPixels.X) * (screenRectangle.Height / SizeInPixels.Y);
tileChunks = new Tilemap[numberOfChunks];
Point currentChunk = new Point();
int chunk_i = 0;
for (int y = topLeft.Y; y < (bottomRight.Y - SizeInPixels.Y); y += SizeInPixels.Y)
{
for (int x = topLeft.X; x < (bottomRight.X - SizeInPixels.X); x += SizeInPixels.X, chunk_i++)
{
currentChunk.X = x;
currentChunk.Y = y;
tileChunks[chunk_i] = ScreenToChunk(currentChunk, camera);
}
}
}
TileRef[] returnTiles = new TileRef[numberOfTiles];
int i = 0;
Point tileScreenCoords = Point.Zero;
for (int y = screenRectangle.Y; y < (screenRectangle.Bottom - CellHeight); y += CellHeight)
{
for (int x = screenRectangle.X; x < (screenRectangle.Right - CellWidth); x += CellWidth, i++)
{
tileScreenCoords.X = x;
tileScreenCoords.Y = y;
TileRef currentTileRef = ScreenToTileRef(tileScreenCoords);
returnTiles[i] = currentTileRef;
}
}
return(returnTiles);
}
public void SetTileGroup(TileRef[] tileRefs, int tileId)
{
for (int i = 0; i < tileRefs.Length; i++)
{
TileRef t = tileRefs[i];
if (t.Chunk != null)
{
int?index = t.Chunk.TileCoordinatesToTileIndex(t.TileCoordinates);
if (index.HasValue)
{
t.Chunk.Tiles[(int)index] = tileId;
}
}
}
}
TileRef ScreenToTileRef(Point screenPosition)
{
TileRef tile = new TileRef();
Tilemap chunk = ScreenToChunk(screenPosition, camera);
if (chunk != null)
{
Point tileCoords = chunk.ScreenToTileCoordinates(screenPosition, camera);
Point chunkCoords = chunk.ChunkCoords;
tile.Chunk = chunk;
tile.ChunkCoordinates = chunkCoords;
tile.TileCoordinates = tileCoords;
}
else
{
tile.Chunk = null;
}
return(tile);
}