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local bgcolor = {255, 255, 255, 255} -- White background color

function clear()
    fill(unpack(bgcolor)) -- Set background fill color
    rect(0, 0, WIDTH, HEIGTH) -- Fill the entire screen


function draw()
    clear() -- Clear the screen

This most likely works. XCode probably has a similair function, but I couldn't find any documentation. If you could tell me where you got it from I might be able to help you further.