corona-stutter.lua

corona-stutter.lua

  local spaceship = display.newGroup()
  App.hud:insert(spaceship)
  spaceship.y = display.contentHeight - 100
  spaceship.x = display.contentWidth * 0.5

  local image = display.newImage(
    spaceship,
    'assets/images/game/spaceship.png',
    0, 0
  )

  ----------------------------------------------------

  local getTimer = system.getTimer
  local latestTime = getTimer()

  local way = 1
  local speed = 250
  local function moveSpaceship()
    local ms = getTimer()
    local dt = ms - latestTime
    latestTime = ms

    local distance = speed * dt / 1000 * way
    spaceship.y = spaceship.y - distance

    if(spaceship.y < 100 or spaceship.y > display.contentHeight -100) then
      way = way * -1
      -- Runtime:removeEventListener('enterFrame', moveSpaceship)
    end
  end

  Runtime:addEventListener('enterFrame', moveSpaceship)