fn_MoveMouseRelative

log = OutputLogMessage
Sleep_Delay = 1

function OnEvent(event, arg)
    if event == "PROFILE_ACTIVATED" then
        EnablePrimaryMouseButtonEvents(true)

    elseif event == "MOUSE_BUTTON_PRESSED" and arg == 4 then
        x, y = GetMousePosition()
        save_x, save_y = fn_GridToPixel(x, y)
        log("x = %d, y = %d\n", save_x, save_y)


    elseif event == "MOUSE_BUTTON_PRESSED" and arg == 5 then
        fn_MoveMouseRelative(-1920, -1080)      -- forces mouse to corner
        fn_MoveMouseRelative(save_x, save_y)        -- moves relative to saved location
    end
end


function fn_GridToPixel(x, y)
    local resolution = { x = 1920, y = 1080 }
    local max_grid_val = 65535
    local conv_x, conv_y

    conv_x = x * ((resolution.x-1) / max_grid_val) + 1
    conv_y = y * ((resolution.y-1) / max_grid_val) + 1

    return conv_x, conv_y
end

function fn_MoveMouseRelative(x, y)
    local max_inc = 32
    local n
    local sign

    if x >= 0 then
        sign = 1
    else
        sign = -1
    end
    n = math.floor(math.abs(x / max_inc))
    for i = 1, n do
        MoveMouseRelative(max_inc * sign, 0)
        if Sleep_Delay then
            Sleep(Sleep_Delay)
        end
    end
    MoveMouseRelative( (x % max_inc) * sign, 0)

    if y >= 0 then
        sign = 1
    else
        sign = -1
    end
    n = math.floor(math.abs(y / max_inc))
    for i = 1, n do
        MoveMouseRelative(0, max_inc * sign)
        if Sleep_Delay then
            Sleep(Sleep_Delay)
        end
    end
    MoveMouseRelative(0, (y % max_inc) * sign)
end