Mineclonia/mods/HUD/mcl_formspec/init.lua

mcl_formspec = {}

function mcl_formspec.get_itemslot_bg(x, y, w, h)
	local out = ""
	for i = 0, w - 1, 1 do
		for j = 0, h - 1, 1 do
			out = out .."image["..x+i..","..y+j..";1,1;mcl_formspec_itemslot.png]"
		end
	end
	return out
end

-- From the Minetest Lua API doc, "Migrating to Real Coordinates"
local padding, spacing = 3/8, 5/4

function mcl_formspec.size2r(w, h)
	return (((w-1)*spacing) + (padding*2) + 1)..","..(((h-1)*spacing) + (padding*2) + 1)
end

local function i2r(i)
	return (i*spacing)+padding
end
mcl_formspec.i2r=i2r

function mcl_formspec.xy2r(x, y)
	return i2r(x)..","..i2r(y)
end

function mcl_formspec.get_itemslot_bgv2(x, y, w, h)
	local out = ""
	x=i2r(x)-padding
	y=i2r(y)-padding
	for i = 0, w - 1, 1 do
		for j = 0, h - 1, 1 do
			out = out .."image["..x+i2r(i)..","..y+i2r(j)..";1,1;mcl_formspec_itemslot.png]"
		end
	end
	return out
end