Circular Transition

local function sine(t, tMax, start, delta)
    return math.sin(math.pi * 2 * t/tMax) * delta
end

local function  cosine(t, tMax, start, delta)
    return math.cos(math.pi * 2 * t/tMax) * delta
end

display.setStatusBar(display.statusBarHidden)
local square = display.newRect( 0, 0, 50, 50 )
local _W, _H = display.contentWidth, display.contentHeight

square.x = _W * 0.5
square.y = _H * 0.5

transition.to(square, {time = 1000, y = -100, delta = true, transition = sine, iterations = 10})
transition.to(square, {time = 1000, x = -100, delta = true, transition = cosine, iterations = 10})