我有类似的情况fiddle ,其中我有一个 CSS3 动画,它缩放绝对定位在另一个元素中心的元素。然而,当动画发生时它是偏离中心的,如示例中相对于蓝色的红色方 block 所示。我该如何居中呢?我尝试了一些围绕 transform-origin
属性的配置,但这并没有产生正确的结果。
@keyframes ripple_large {
0% {transform:scale(1); }
75% {transform:scale(3); opacity:0.4;}
100% {transform:scale(4); opacity:0;}
}
.container {
position: relative;
display: inline-block;
margin: 10vmax;
}
.cat {
height: 20vmax;
}
.center-point {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
height: 10px;
width: 10px;
background: blue;
}
.to-animate {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
border: 1px solid red;
height: 5vmax;
width: 5vmax;
transform-origin:center;
}
.one {
animation: ripple_large 2s linear 0s infinite;
}
.two {
animation: ripple_large 2s linear 1s infinite;
}
<div class='container'>
<img src='http://www.catster.com/wp-content/uploads/2017/08/Pixiebob-cat.jpg' class='cat'>
<div class='center-point'>
</div>
<div class='to-animate one'></div>
<div class='to-animate two'></div>
</div>
最佳答案
问题是您正在覆盖 translate
转换。
当您指定一个新的转换(动画中的那个)时,它会覆盖第一个。在您的情况下,您正在删除修复中心对齐的翻译。
您需要将它们添加到相同的 transform
属性并注意顺序,因为它很重要 ( Why does order of transforms matter? rotate/scale doesn't give the same result as scale/rotate )
@keyframes ripple_large {
0% {
transform: translate(-50%, -50%) scale(1);
}
75% {
transform: translate(-50%, -50%) scale(3);
opacity: 0.4;
}
100% {
transform: translate(-50%, -50%) scale(4);
opacity: 0;
}
}
.container {
position: relative;
display: inline-block;
margin: 10vmax;
}
.cat {
height: 20vmax;
}
.center-point {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
height: 10px;
width: 10px;
background: blue;
transform-origin: center;
}
.to-animate {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
border: 1px solid red;
height: 5vmax;
width: 5vmax;
}
.one {
-webkit-animation: ripple_large 2s linear 0s infinite;
animation: ripple_large 2s linear 0s infinite;
}
.two {
-webkit-animation: ripple_large 2s linear 1s infinite;
animation: ripple_large 2s linear 1s infinite;
}
<div class='container'>
<img src='http://www.catster.com/wp-content/uploads/2017/08/Pixiebob-cat.jpg' class='cat'>
<div class='center-point'>
</div>
<div class='to-animate one'></div>
<div class='to-animate two'></div>
</div>
更新
如评论所述,最好使用另一种方法使元素居中而不是平移以避免更改动画,因为这可以与其他元素一起使用。
例子:
@keyframes ripple_large {
0% {
transform: scale(1) ;
}
75% {
transform:scale(3) ;
opacity: 0.4;
}
100% {
transform: scale(4) ;
opacity: 0;
}
}
.container {
position: relative;
display: inline-block;
margin: 10vmax;
}
.cat {
height: 20vmax;
}
.center-point {
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
height: 10px;
width: 10px;
background: blue;
transform-origin:center;
}
.to-animate {
position: absolute;
top: 0;
left: 0;
bottom:0;
right:0;
margin:auto;
border: 1px solid red;
height: 5vmax;
width: 5vmax;
}
.one {
animation: ripple_large 2s linear 0s infinite;
}
.two {
animation: ripple_large 2s linear 1s infinite;
}
<div class='container'>
<img src='http://www.catster.com/wp-content/uploads/2017/08/Pixiebob-cat.jpg' class='cat'>
<div class='center-point'>
</div>
<div class='to-animate one'></div>
<div class='to-animate two'></div>
</div>
关于html - 如何在比例动画中将原点保持在图像的中心?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47820827/