function love.load()
    windowwidth = 1000
    windowheight = 1000
    sucess = love.window.setMode(windowwidth, windowheight)
    x = 30
    y = 50
    z = math.sin(math.pi/3)
    cx = 0
    cy = 0
    a = 20
    b = 3
  end

  function love.update(dt)
    -- added dt as a parameter ... is dt 1/framerate?
    if love.keyboard.isDown("up") then a = a/2*dt end
    if love.keyboard.isDown("down") then a = a/2*dt end
    if love.keyboard.isDown("left") then b = b*2*dt end
    if love.keyboard.isDown("right") then b = b/2*dt end
  end

  function love.draw()
    -- render to window
    -- y = asin(bx + c)
    love.graphics.setColor(200/255, 215/255, 0/255)
    delthe = math.pi/60 -- 3 degrees
    x = 0
    p = 1
    ps = 4 -- phase shift of 4
    odeg = math.pi/180
    for theta = -32*math.pi, 32*math.pi, odeg do
      love.graphics.line(x, a*math.sin(b*(theta))+windowwidth/2, x+odeg, a*math.sin(b*theta+odeg)+windowwidth/2)
      x = x + 0.1
    end
  end