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-- scroll_txt.lua
-- german version here: https://pastebin.com/z2ZW5nT7
-- Scrolling text across ALL connected monitors + optional in-game clock
-- Works best with CC:Tweaked + Advanced Monitors

-- =========== CONFIGURATION ===========
local config = {
  text = "WELCOME! This is a synchronized scrolling text across all monitors. ",
  delay = 0.06,            -- Seconds per scroll step (smaller = faster)
  direction = "left",      -- "left" or "right"
  color = "white",         -- Text color
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  bg = "black",            -- Background color
  scale = 2,               -- Text scale (0.5–5 on Advanced Monitors)
  vertical_center = true,  -- Center vertically (true) or top (false)
  loops = 0,               -- 0 = infinite, >0 = number of loops
  show_border = false,     -- Show border line at top/bottom
  show_clock = true        -- Show Minecraft time (HH:MM) in the top right corner
}
-- =====================================

-- Color mapping (human-readable names → CC colors)
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local colorMap = {
  white = colors.white, black = colors.black, red = colors.red,
  green = colors.green, blue = colors.blue, yellow = colors.yellow,
  pink = colors.pink or colors.magenta, magenta = colors.magenta,
  cyan = colors.cyan, brown = colors.brown, orange = colors.orange
}

-- Find all monitors connected to the computer
local monitors = { peripheral.find("monitor") }
if #monitors == 0 then
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  print("No monitor found. Please connect at least one monitor.")
  return
end

-- Prepare each monitor
for _, mon in ipairs(monitors) do
  pcall(function() mon.setTextScale(config.scale) end)
  pcall(function() mon.setTextColor(colorMap[config.color] or colors.white) end)
  pcall(function() mon.setBackgroundColor(colorMap[config.bg] or colors.black) end)
  mon.clear()
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end

-- Use the size of the first monitor as reference
local width, height = monitors[1].getSize()
local yPos = 1
if config.vertical_center then
  yPos = math.floor(height / 2)
  if yPos < 1 then yPos = 1 end
end

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-- Prepare the scrolling string
local raw = tostring(config.text)
if raw == "" then raw = " " end
local pad = string.rep(" ", math.max(5, width))
local long = raw .. pad
local doubled = long .. long
local textLen = #long

-- Optional border drawing
local function drawBorder()
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  if not config.show_border then return end
  for _, mon in ipairs(monitors) do
    mon.setCursorPos(1,1)
    mon.write(string.rep("-", width))
    mon.setCursorPos(1,height)
    mon.write(string.rep("-", width))
  end
end

drawBorder()
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-- Helper: format Minecraft in-game time
local function getTimeString()
  -- os.time() returns the current Minecraft day time (0–24)
  local t = os.time()
  local hours = math.floor(t)
  local minutes = math.floor((t - hours) * 60)
  return string.format("%02d:%02d", hours, minutes)
end

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-- Main scroll loop
local pos = 1
local steps = 0
local maxLoops = (config.loops > 0) and config.loops or 0
local running = true

while running do
  -- Wrap around scroll position
  if pos < 1 then pos = pos + textLen end
  if pos > textLen then pos = pos - textLen end
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  local startIndex = pos
  local display = doubled:sub(startIndex, startIndex + width - 1)
  if #display < width then
    display = display .. string.rep(" ", width - #display)
  end

  -- Update all monitors
  for _, mon in ipairs(monitors) do
    -- Clear and write the scrolling text line
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    mon.setCursorPos(1, yPos)
    mon.write(string.rep(" ", width))
    mon.setCursorPos(1, yPos)
    mon.write(display)

    -- Draw clock (if enabled)
    if config.show_clock then
      local clock = getTimeString()
      mon.setCursorPos(width - #clock + 1, 1)
      mon.write(clock)
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    end
  end

  -- Update position
  if config.direction == "right" then
    pos = pos - 1
  else
    pos = pos + 1
  end

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  steps = steps + 1
  if maxLoops > 0 and steps >= (textLen * maxLoops) then
    break
  end

  -- Timer wait (allows terminate with Ctrl+T)
  local timerId = os.startTimer(config.delay)
  while true do
    local ev = { os.pullEvent() }
    if ev[1] == "timer" and ev[2] == timerId then break end
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    if ev[1] == "terminate" then running = false break end
  end
end

-- End: show stopped message
for _, mon in ipairs(monitors) do
  mon.setCursorPos(1, yPos)
  mon.write(string.rep(" ", width))
  mon.setCursorPos(1, yPos)
  mon.write("<stopped>")
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end
print("Script finished.")

earth computer pastebin