cartographer

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cartographer = require 'externalLibs.cartographer.cartographer' -- if it's in subfolders
-- load a map
local map = cartographer.load 'map.lua'

function love.load()
	local layer = map:getLayer("layer1")
	local allTiles = layer:getTiles()
	for v in allTiles do
	      print(v)
	end

end
function love.update(dt)
	-- update animations
	map:update(dt)
end

function love.draw()
	-- draw the whole map
	map:draw()
end

This code doesn't work, despite that map is drawn on the screen, following error occurs when I try to iterate over tiles:

Error

externalLibs/cartographer/cartographer.lua:649: attempt to perform arithmetic on local 'i' (a nil value)


Traceback

externalLibs/cartographer/cartographer.lua:649: in function '(for generator)'
main.lua:8: in function 'load'
[C]: in function 'xpcall'
[C]: in function 'xpcall'

Can you provide an example project that demonstrates the issue?

Actually never mind, I think I know what your issue is.

Try changing:

	local allTiles = layer:getTiles()
	for v in allTiles do
	      print(v)
	end

To:

	for v in layer:getTiles() do
	      print(v)
	end

Similar to ipairs, getTiles returns 3 different values, all of which are needed for the loop to function properly. Since you were assigning getTiles() to only one intermediate variable, you're missing the other two variables.