local component = require("component")
local gpu = component.gpu -- get primary gpu component
local w, h

w_res, h_res = gpu.getResolution()
w_rel_quotient = w_res/100
h_rel_quotient = h_res/100

function w_rel( w) -- w relativ
	return  ( w * w_rel_quotient )
end

function h_rel( h) -- h relativ
	return  ( h * h_rel_quotient )
end

gpu.fill(1, 1, w_res, h_res, " ") -- clears the screen

gpu.setForeground(0xFFFFFF)
gpu.setBackground(0x000011)

gpu.fill(w_rel(1), h_rel(1), w_rel(8), h_rel(8), "X") -- fill top left quarter of screen

print("W:",w_res)
print("H:",h_res)