Objects on a tilemap

[User137]

Your original solution was almost perfect, but you are right, on larger maps it would get lower performance. Thus you can divide your map into chunks.

const CHUNKSIZE = 32;

TChunk = class
public
  posX, posY: integer;
  Tiles: array[0..CHUNKSIZE-1, 0..CHUNKSIZE] of TTile;
  Objects: array of TObject;
end;

TMap = class
public
  Chunks: array of array of TChunk;
  function GetTile(x, y: integer): TTile;
end;

function TMap.GetTile(x, y: integer): TTile;
var cx, cy: integer;
procedure
  cx:=x div CHUNKSIZE;
  cy:=y div CHUNKSIZE;
  result:=Chunks[cx, cy].Tiles[x-cx, y-cy]
end;

Or something along these lines... Of course you could do range checking in GetTile() to avoid critical errors on negative values or out of boundaries.

[Carver413]

if I were trying to do someting like this I would use an 8bit index map and use index 0 as a null. the background would be for normal size tiles while the forground would be for larger tiles. then I would add a clip frame that reperesents the view able portion of the map. now all you have to do is move the clipframe around within the map to change the view. on the forground the indexed position would be the top/left and all indexes underneath it would be 0's. your clip frame would have to be larger then the actual view so if a larger tile were half on it would still be displayed.