javascript - 使用scrollMagic从右向左滑动动画

Question

我是 GSAP 新手。

我正在关注 MilklsNice 的 ScrollMagic 和 GSAP 教程 YouTube .

在 GSAP 动画中，他解释了如何制作看起来像从左到右打开一本书的动画。

var overlay_test = document.querySelector('.overlay_test');

var animate_in = new TimelineMax();

animate_in
    .fromTo(overlay_test, 2, 
    {skewX: 10, scale: 1.5}, 
    {skewX: 0, xPercent: 100, transformOrigin: "0% 100%", ease: Power2.easeOut})

.box_test{
		position: relative;
    overflow: hidden;
    height: 350px;
}

.img_test{
    width: 800px;
}

.overlay_test{
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    background:white;
    width: 100%;
    height: 100%;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/1.20.2/TweenMax.min.js"></script>
<div class="box_test">
   <img class="img_test" src="https://images.unsplash.com/photo-1553696801-25638feb93fe?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1000&q=80" alt="korea">
    <div class="overlay_test"></div>
</div>

(您也可以查看 the CodePen 来了解这一点)

此时webpage ，我学会了如何从右到左显示 div。代码如下:

var left = new TimelineMax ();

var rect = document.getElementById('rect');

left
  .from(rect,2,{width:0},1)
  .from(rect,2,{left:400},1)

Result
EDIT ON
 body{
  background: #414141;
  overflow:hidden;
}

#rect{
  position:relative;
  width:400px;
  height:350px;
  margin: 20px;
  background: green;
  align-items: center;
  overflow:hidden;
}
#copy{
  position: absolute;
  bottom: 0;
  margin: 0 10px;
  
}
h1{
  font-family: 'Work Sans', sans-serif;
  color: white;
  width: max-content;
  margin: 0 auto;
  font-size: 145px;
  line-height: 100px;
}
.very{
  font-size: 80px;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/1.20.2/TweenMax.min.js"></script>
<div id="rect">
  <div id="copy">
    <h1 class="very">Very cool </h1>
    <h1>  Jack!</h1>
  </div>
</div>

(您还可以为此查看 the CodePen)

顺便说一下，
这个动画不完全是我想要的。因为，它只是将 div 从右向左移动，而不是像打开一本书一样从右向左打开它。不过，我还是尝试了:

var overlay_test = document.querySelectorAll('.overlay_test');

var animate_in = new TimelineMax();

animate_in
  .from(overlay_test,2,{width:0},1)
  .from(overlay_test,2,{left:800},1)

.box_test{
		position: relative;
    overflow: hidden;
    height: 350px;
}

.img_test{
    width: 800px;
}

.overlay_test{
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    background:white;
    width: 100%;
    height: 100%;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/1.20.2/TweenMax.min.js"></script>
<div class="box_test">
   <img class="img_test" src="https://images.unsplash.com/photo-1553696801-25638feb93fe?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1000&q=80" alt="korea">
    <div class="overlay_test"></div>
</div>

(您还可以为此查看 the CodePen)

现在，图像消失了。所以，我想我可以将动画应用到图片上，而不是覆盖图像。然而，现在动画从屏幕的左上角作为一个非常小的图像开始，并从那里扩展。

var img_test = document.querySelectorAll('.img_test');

var animate_in = new TimelineMax();

animate_in
  .from(img_test,2,{width:0},1)
  .from(img_test,2,{left:800},1)

.box_test{
		position: relative;
    overflow: hidden;
    height: 350px;
}

.img_test{
    width: 800px;
}

.overlay_test{
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    background:white;
    width: 100%;
    height: 100%;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/1.20.2/TweenMax.min.js"></script>
<div class="box_test">
   <img class="img_test" src="https://images.unsplash.com/photo-1553696801-25638feb93fe?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1000&q=80" alt="korea">
</div>

(您还可以查看 the CodePen 来了解这一点)

这也不是我想要的。

I want to make an animation that looks like opening a book from RIGHT to LEFT. (the opposite of what I include at the beginning.)

我怎样才能实现它？ :)

Answer 1

在动画中使用 right:0 到 right:200% 也在 css 中将 left:0 更改为 right:0

See code

var overlay_test = document.querySelector('.overlay_test');

var animate_in = new TimelineMax();

animate_in
    .fromTo(overlay_test, 2, 
    {skewX: 10, scale: 1.5 , right:0 }, 
    {skewX: 0, right:"200%" ,transformOrigin: "0% 100%", ease: Power2.easeOut})

.box_test{
		position: relative;
    overflow: hidden;
    height: 350px;
}

.img_test{
    width: 800px;
}

.overlay_test{
    display: block;
    position: absolute;
    right: 0;
    top: 0;
    background:white;
    width: 100%;
    height: 100%;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/1.20.2/TweenMax.min.js"></script>

<div class="box_test">
   <img class="img_test" src="https://images.unsplash.com/photo-1553696801-25638feb93fe?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1000&q=80" alt="korea">
    <div class="overlay_test"></div>
</div>