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--Place iron chests every 50 tile both up and down and use a find_entities function to find it. If its found then it 
--Changes the tiles in a 30*30 tiles big area. 

--First place down the markers in as big of an area as possible
distBetween = 30
function placeMarkers()
  for x = 1, 200 do
    xPos = (x-100) * distBetween 
    for y = 1, 200 do
	  game.surfaces["nauvis"].create_entity({name = "iron-chest", position = {xPos, (y - 100) * distBetween}, force = game.forces.player})
	end
  end
end
--Find those chests and if its closer than 50 tiles then change all the tiles in its space to the new tiles
searchDist = 150
function changetiles2()	
  chestsFound = {}
  found = 0
  results = game.surfaces["nauvis"].find_entities_filtered{area = {{game.player.position.x -searchDist, game.player.position.y -searchDist}, {game.player.position.x +searchDist, game.player.position.y +searchDist}}, name= "iron-chest"}
  for d,ent in pairs(results) do
  game.player.print("Number: "..d)
    if ent.position ~= nil then
      chestsFound[d] = ent.position
	  found = found + 1
	  ent.destroy()
	end
  end
  for n = 1, found do
    --if ent ~= nil then
	if chestsFound[n] ~= nil then

      for x = 1, 30 do
        xPos = chestsFound[n].x + x - 2	
	    for y = 1, 30 do
	      yPos = chestsFound[n].y + y - 2
		  --If it collides with a player turn it into lava if not turn it to lavaStone
          if game.surfaces["nauvis"].get_tile(xPos, yPos).collides_with("player-layer") then 
	        --game.player.print("yes!") 
	        game.surfaces["nauvis"].set_tiles{{name = "lava", position = {xPos, yPos}}} 
	      else
	        game.surfaces["nauvis"].set_tiles{{name = "lavaStone", position = {xPos, yPos}}} 
	      end
	    end
	  end
--ent.destroy()
	--end
	end
  end
end