check if graphic for icon usage exists or use "placeholder" graphic

[usafphoenix]

How do i check if a graphic file with a given name exists inside a mod or directory in lua for factorio? and if it doesn't, use a different graphics file instead?

something like if "__modname__/graphics/technology/techname.png" exists then tech.icon="__modname__/graphics/technology/techname.png" else tech.icon="__modname__/graphics/technology/nographic.png" end

or:
tech.icon="__modname__/graphics/technology/techname.png" or "__modname__/graphics/technology/nographic.png"

neither seem to work

[eradicator]

The data stage runs before texture loading, and thus even the engine itself probably doesn't know which files exist yet. In any case there is no way to check if a given file exists.

But you can test if a mod is installed:

Code: Select all

if mods['mod-name'] == '1.0.0' then
  end 

Or you can just grab the icon from the other mods prototype:

Code: Select all

if data.raw.technology['other-mod-tech-name'] then
  tech.icon = data.raw.technology['other-mod-tech-name'].icon
  end