Animation Corona SDK中的iOS摇摆动画？

在Corona SDK中，我无法从iOS设置摆动效果的动画。它现在在振动，但不太相似

-- Animation.new(p1.img) // how to call from main.lua

module(..., package.seeall)

function new(obj)
    obj.x = 150
    obj.y = 150
    local ox = obj.x
    local oy = obj.y

    function obj:timer(e) ----- reset the position of object back to it's original
        local function reset()
            obj.x = ox; obj.y = oy
            print("reset called...")
        end

        local t=25
        self:setReferencePoint(display.CenterReferencePoint)
        transition.to(self, { time=t, x=obj.x+4, rotation=5, transition=easing.outExpo, onComplete=listener2})
        transition.to(self, { time=t, delay=t, x=obj.x-8, rotation=-10, transition=easing.outExpo, onComplete=reset})
    end

    timer.performWithDelay(150, obj, 20)

end

---

简单地将两个transition.to行更改为following将产生类似的效果

transition.to(self, { time=t,  rotation=4, transition=easing.outExpo, onComplete=listener2})
transition.to(self, { time=t, delay=t, rotation=-3, transition=easing.inExpo, onComplete=reset})