css3实现椭圆轨迹旋转

实现效果

X轴Y轴在一个矩形内移动

做斜线运动

.ball {
    position: absolute;
    animation: 
      animX 2s linear  infinite alternate,
      animY 2s linear  infinite alternate
  }
@keyframes animX{
      0% {left: 0px;}
    100% {left: 500px;}
}
@keyframes animY{
      0% {top: 0px;}
    100% {top: 300px;}
}

设置动画延时

设置Y轴延时为动画时长的一半, 运动轨迹变成菱形

.ball {
     animation: 
       animX 2s linear 0s infinite alternate,
       animY 2s linear -1s infinite alternate
}

设置三次贝塞尔曲线

.ball {
     animation: 
       animX 2s  cubic-bezier(0.36, 0, 0.64, 1) -1s infinite alternate,
       animY 2s cubic-bezier(0.36, 0, 0.64, 1) 0s infinite alternate
}

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缩小放大

为了看起来有立体感添加scale属性,scale动画应该是X轴和Y轴的时间总和

.ball1 {
    animation: 
      animX 2s  cubic-bezier(0.36, 0, 0.64, 1) -1s infinite alternate,
      animY 2s cubic-bezier(0.36, 0, 0.64, 1) 0s infinite alternate,
      scale 4s cubic-bezier(0.36, 0, 0.64, 1) 0s infinite alternate;
  }
 @keyframes scale {
 
    0% {
      transform: scale(0.7)
    }
    50% {
      transform: scale(1)
    }
    100% {
      transform: scale(0.7)
   }
 }