Question

我需要让opacity表面从0转换为1，如下所示：

stateModifier.setTransform(
  Transform.multiply(Transform.opacity(1), Transform.rotateX(0)), 
  { duration : 500, curve: Easing.inOutSine }
);

但Transform.opacity并不存在。我知道这是基本的，但如何使用translate或rotate等其他属性转换不透明度。

根据http://famo.us/guides/animations

，我知道modifier已setOpacity

更新

我认为stateModifier.setOpacity是异步的，可以与其他内容（例如翻译或缩放）并行设置动画，但它不是异步的。它首先发生然后移动到下一个动画。这就是我问这个问题的原因。

Answer 1

在您更新问题后，我认为我更了解您的需求。下面是同时更改不透明度，大小和原点的代码。希望这是一个比我以前提供给你更好的答案。当然，你可以看到这是一个工作小提琴here

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

chainSurface.chain = new ModifierChain();

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

chainSurface.chain.addModifier(chainSurface.fadeState);
chainSurface.chain.addModifier(chainSurface.sizeState);
chainSurface.chain.addModifier(chainSurface.state);

mainContext.add(chainSurface.chain).add(chainSurface);

chainSurface.on('click', function(){
  transition = {duration:1000,curve:Easing.inOutQuad};

  chainSurface.fadeState.setOpacity(0,transition);
  chainSurface.sizeState.setTransform(Transform.scale(0.5,0.5,1),transition);
  chainSurface.state.setOrigin([0.5,0],transition);
});

Answer 2

我创建了一个github repo，其中包含一个如何使用一个Modifier进行操作的示例。 https://github.com/thiswildorchid/famous-modifier-reuse但我在这里以代码为例。在此示例中，动画是在单击曲面时触发的，但您可以按照自己喜欢的方式触发动画。这里还有一个小提琴http://jsfiddle.net/orchid1/jd2q7r0v/1/

我使用了Tranform.rotateX，但您可以使用任何旋转变换。请注意，我为起始值设置了默认值。这种方法的好处是您只使用一个修改器，而您不需要ModifierChain。

    var Engine = require("famous/core/Engine"),
    Modifier = require("famous/core/Modifier"),
    Surface = require("famous/core/Surface"),
    Transitionable = require("famous/transitions/Transitionable"),
    Transform = require("famous/core/Transform");

var context, mod, surf, opacityTransform, rotateTransform;

context = Engine.createContext();

context.setPerspective(1000);

//the opacities starting value is 1
opacityTransform = new Transitionable(1);

//the starting rotation is an angle of zero
//you can console log Transform.identity to see the value but its basically an angle of 0
rotateTransform = new Transitionable(Transform.identity);


//very basic modifier here
mod = new Modifier({
    size: [100, 100],
    origin: [0.5, 0.5],
    align: [0.5, 0.5]
});

//very simple surface
surf = new Surface({
    content: "Hello World",
    properties: {
        border: "1px red solid",
        textAlign: "center",
        lineHeight: "100px"
    }
});

//gotta add everything to the context
context.add(mod).add(surf);

//here I tell the modifier to transform using my custom transitionables transforms
mod.transformFrom(rotateTransform);
mod.opacityFrom(opacityTransform);


//for illustration purposes I used a click event but trigger it any way you like 
surf.on("click", function () {

    //you can add an easing function here if you would like and even a callback as the 3rd argument
    //more importantly here you see I set the opacity to 0 and the rotation to the new angle I want
    opacityTransform.set(0, {duration: 1000});
    rotateTransform.set(Transform.rotateX(1.4), {duration: 1000});
});

使用其他Transform函数动画不透明度异步

2 个答案: