Rotate objects around circle using CSS?

问题

I'm attempting to have three objects rotating around a circle. So far I've been able to get one object to spin around the circle. I am unable to get more than one without messing up the code. Could anyone advise on the best way to accomplish this? Here is part of the code and a Fiddle. Thanks!

Here is the Demo

.outCircle {
  width: 200px;
  height: 200px;
  background-color: lightblue;
  left: 270px;
  position: absolute;
  top: 50px;
  -moz-border-radius: 100px;
  -webkit-border-radius: 100px;
  border-radius: 100px;
}
.rotate {
  width: 100%;
  height: 100%;
  -webkit-animation: circle 10s infinite linear;
}
.counterrotate {
  width: 50px;
  height: 50px;
  -webkit-animation: ccircle 10s infinite linear;
}
.inner {
  width: 100px;
  height: 100px;
  background: red;
  -moz-border-radius: 50px;
  -webkit-border-radius: 50px;
  border-radius: 100px;
  position: absolute;
  left: 0px;
  top: 0px;
  background-color: red;
  display: block;
}
@-webkit-keyframes circle {
  from {
    -webkit-transform: rotateZ(0deg)
  }
  to {
    -webkit-transform: rotateZ(360deg)
  }
}
@-webkit-keyframes ccircle {
  from {
    -webkit-transform: rotateZ(360deg)
  }
  to {
    -webkit-transform: rotateZ(0deg)
  }
}

<div class="outCircle">
  <div class="rotate">
    <div class="counterrotate">
      <div class="inner">hello
      </div>
    </div>
  </div>
</div>

回答1:

Jquery solution which works for any number of outer items.

Jquery shamelessly stolen from ThiefMaster♦ and their answer at this Q & A

var radius = 100; // adjust to move out items in and out 
var fields = $('.item'),
  container = $('#container'),
  width = container.width(),
  height = container.height();
var angle = 0,
  step = (2 * Math.PI) / fields.length;
fields.each(function() {
  var x = Math.round(width / 2 + radius * Math.cos(angle) - $(this).width() / 2);
  var y = Math.round(height / 2 + radius * Math.sin(angle) - $(this).height() / 2);
  if (window.console) {
    console.log($(this).text(), x, y);
  }
  $(this).css({
    left: x + 'px',
    top: y + 'px'
  });
  angle += step;
});

body {
  padding: 2em;
}
#container {
  width: 200px;
  height: 200px;
  margin: 10px auto;
  border: 1px solid #000;
  position: relative;
  border-radius: 50%;
  animation: spin 10s linear infinite;
}
.item {
  width: 30px;
  height: 30px;
  line-height: 30px;
  text-align: center;
  border-radius: 50%;
  position: absolute;
  background: #f00;
  animation: spin 10s linear infinite reverse;
}
@keyframes spin {
  100% {
    transform: rotate(1turn);
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="container">
  <div class="item">1</div>
  <div class="item">2</div>
  <div class="item">3</div>
  <div class="item">4</div>
  <div class="item">5</div>
  <div class="item">6</div>
</div>

回答2:

How about this, demo at the bottom with 3 circles:

.outCircle  {
    width: 200px;
    height: 200px;
    background-color: lightblue;
    left: 270px;
    position: absolute;
    top: 50px;
	-moz-border-radius: 100px;
	-webkit-border-radius: 100px;
	border-radius: 100px;
}

.duringTwentyOne {
  -webkit-animation-duration: 21s;
}

.duringTen {
  -webkit-animation-duration: 10s;
}

.duringFour {
  -webkit-animation-duration: 4s;
}

.infinite {
   -webkit-animation-iteration-count: infinite;
}

.linear {
   -webkit-animation-timing-function: linear;
}

.counter {
   width: 50px;
   height: 50px;
   -webkit-animation-duration: inherit;
   -webkit-animation-direction: reverse;
   -webkit-animation-timing-function: inherit;
   -webkit-animation-iteration-count: inherit;
   -webkit-animation-name: inherit;
}

.rotate {
    width: 100%;
    height: 100%;
    -webkit-animation-name: circle;
    position: relative;
    z-index : 10;
    display : block;
}

.second {
  top : -100%;
}

.thirdBigger {
  top : -240%;
  left: -40%;
  width:150%;
  height: 150%;
}
  
.inner {
    width: 100px;
	height: 100px;
	-moz-border-radius: 50px;
	-webkit-border-radius: 50px;
	border-radius: 100px;
    position: absolute;
    left: 0px;
    top: 0px;
    background-color: red;
    display: block;

}

.red {
  	background: red;
}

.green {
  	background: green;
}


@keyframes circle {
    from {-webkit-transform: rotateZ(0deg)}
    to {-webkit-transform: rotateZ(360deg)}
}

<div class="outCircle">
  <div class="rotate linear infinite duringTen">
    <div class="counter">
      <div class="inner">hello
      </div>
    </div>
  </div>
  <div class="second rotate linear infinite duringFour">
    <div class="counter">
      <div class="inner red">bye bye
      </div>
    </div>
  </div>
  <div class="thirdBigger rotate linear infinite duringTwentyOne">
    <div class="counter">
      <div class="inner green">s'up
      </div>
    </div>
  </div>
</div>

回答3:

Not sure if this is what you are after, but you need to position your rotating circles absolutely (so they don't interfere with each other) and then give them their own animation:

For the counter rotation, just make them then minus of what the rotation degrees is and that will keep your text horizontal

.outCircle {
  width: 200px;
  height: 200px;
  background-color: lightblue;
  left: 270px;
  position: absolute;
  top: 50px;
  -moz-border-radius: 100px;
  -webkit-border-radius: 100px;
  border-radius: 100px;
}
.rotate {
  width: 100%;
  height: 100%;
  position: absolute;  /* add this */
}
.counterrotate {
  width: 100px;
  height: 100px;
}

.inner {
  width: 100px;
  height: 100px;
  text-align: center;
  vertical-align: middle;
  background: red;
  border-radius: 100px;
  background-color: red;
  display: table-cell;
}
.anim1 {
  -webkit-animation: circle1 10s infinite linear;
}
.anim1 .counterrotate {
  -webkit-animation: ccircle1 10s infinite linear;
}
.anim2 {
  -webkit-animation: circle2 10s infinite linear;
}
.anim2 .counterrotate {
  -webkit-animation: ccircle2 10s infinite linear;
}
.anim3 {
  -webkit-animation: circle3 10s infinite linear;
}
.anim3 .counterrotate {
  -webkit-animation: ccircle3 10s infinite linear;
}
@-webkit-keyframes circle1 {
  from {
    -webkit-transform: rotateZ(0deg)
  }
  to {
    -webkit-transform: rotateZ(360deg)
  }
}
@-webkit-keyframes ccircle1 {
  from {
    -webkit-transform: rotateZ(0deg)
  }
  to {
    -webkit-transform: rotateZ(-360deg)
  }
}
@-webkit-keyframes circle2 {
  from {
    -webkit-transform: rotateZ(90deg)
  }
  to {
    -webkit-transform: rotateZ(450deg)
  }
}
@-webkit-keyframes ccircle2 {
  from {
    -webkit-transform: rotateZ(-90deg)
  }
  to {
    -webkit-transform: rotateZ(-450deg)
  }
}
@-webkit-keyframes circle3 {
  from {
    -webkit-transform: rotateZ(180deg)
  }
  to {
    -webkit-transform: rotateZ(540deg)
  }
}
@-webkit-keyframes ccircle3 {
  from {
    -webkit-transform: rotateZ(-180deg)
  }
  to {
    -webkit-transform: rotateZ(-540deg)
  }
}

<div class="outCircle">
  <div class="rotate anim1">
    <div class="counterrotate">
      <div class="inner">hello
      </div>
    </div>
  </div>
  <div class="rotate anim2">
    <div class="counterrotate">
      <div class="inner">hello
      </div>
    </div>
  </div>
  <div class="rotate anim3">
    <div class="counterrotate">
      <div class="inner">hello
      </div>
    </div>
  </div>
</div>

回答4:

Use translateX.

See this jsfiddle.

I made the outer circle position: relative and the inner ones position: absolute, so they lie on top of each others mids (which is just for illustration, this is just for positioning the child circles on the same spot; grouping them).

Then, from this center spot, the translateX tells the animation to give it a radius of in this case 100px (which is the radius of the outer circle). There you go.

来源：https://stackoverflow.com/questions/39020670/rotate-objects-around-circle-using-css

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css

css-animations