Rocket-Bytes/Source/Menu.lua

local gfx <const> = playdate.graphics
local controlY = 0
local controlX = 0

local index = 0

local menuitems = {}
local menu = null

local imgCursor = gfx.image.new("gfx/cursor")
assert(imgCursor)

function createMenu(items)
    controlX = -80
    index = 0
    menuitems = {}
    local _y =220 
    menu = items[0]
    for i=1, #items, 1 do
        menuitems[i] = {name=items[i],y=_y}
        _y -= 20
    end
end

function updateMenu()
    gfx.clear(gfx.kColorBlack)
    -- input 
    local change, aChange = playdate.getCrankChange()

    if playdate.buttonJustPressed(playdate.kButtonUp) or change < -10 then
        index -= 1
    elseif playdate.buttonJustPressed(playdate.kButtonDown) or change > 10 then
        index += 1
    end

    if index < 0 then index = #menuitems -1 end
    if index > #menuitems - 1 then index = 0 end

    controlX = playdate.math.lerp(controlX, 20, 0.3)
    controlY = playdate.math.lerp(controlY, (20 * index) - 1, 0.5)
    print(index)
    imgCursor:draw(3,controlY + (243 - (20 * #menuitems)))
    for i = 1, #menuitems, 1 do
        local item = menuitems[i]
        gfx.drawText(item.name,controlX,item.y)
    end
end