famo.us:结合 2 个转换同时运行

Question

当用户第一次访问我的应用程序时，我有一个 Logo ，我想将其从屏幕中心移动到顶部，但随着它的移动，我也希望它缩小到原始大小的 1/2。可以通过famo.us 做到这一点吗？

Answer 1

有几种方法可以实现这一目标。为了清晰和简单起见，我建议使用 ModifierChain 类。这允许您将影响单个可渲染的修改器链接在一起。这是您想要实现的目标的示例。

祝你好运!

var Engine              = require("famous/core/Engine");
var Surface             = require("famous/core/Surface");
var StateModifier       = require("famous/modifiers/StateModifier");
var Transform           = require("famous/core/Transform");
var ModifierChain       = require("famous/modifiers/ModifierChain");
var Easing              = require("famous/transitions/Easing");

var context = Engine.createContext();

var surface = new Surface({
  size:[200,200],
  properties: { backgroundColor: 'green'}
})

surface.chain = new ModifierChain();

surface.state = new StateModifier({ origin:[0.5,0.5] });
surface.sizeState = new StateModifier();

surface.chain.addModifier(surface.sizeState);
surface.chain.addModifier(surface.state);

context.add(surface.chain).add(surface);

surface.on('click', function(){

  transition = {duration:1000,curve:Easing.inOutQuad};

  surface.sizeState.setTransform(Transform.scale(0.5,0.5,1),transition);
  surface.state.setOrigin([0.5,0],transition);

});