RPG map basic example

local map = {
"            ",
"            ",
"    !       ",
"            ",
"            ",
"            ",
"        +   ",
"            ",
"  =         ",
"            ",
"      $     ",
"            ",
"            ",
}

local termX,termY = term.getSize()
local posX = math.floor(termX/2)
local posY = math.floor(termY/2)
local text = ""

local function draw()
    term.clear()
    for y = 1,#map do
        term.setCursorPos(1,y)
        term.write(map[y])
    end
    term.setCursorPos(posX,posY)
    term.write("@")
    term.setCursorPos(1,termY)
    term.write(text)
end

while true do
    draw()
    local event = {os.pullEvent()}
    if event[1] == "key" then
        if event[2] == 200 then -- up key
            posY = posY - 1
        elseif event[2] == 208 then -- down key
            posY = posY + 1
        elseif event[2] == 203 then -- left
            posX = posX - 1
        elseif event[2] == 205 then -- right
            posX = posX + 1
        elseif event[2] == 14 then -- Press [Backspace] key to exit
            break
        end
        if posY > termY then
            posY = termY
        elseif posY < 1 then
            posY = 1
        end
        if posX > termX then
            posX = termX
        elseif posX < 1 then
            posX = 1
        end
    end

    if map[posY] then
        text = map[posY]:sub(posX,posX)
    end

end