Smoothly stop CSS keyframe animation

Question

I have the following code: http://jsfiddle.net/odj8v0x4/.

After executing javascript functions stopGlobe() animation stops, but stops abruptly.

Can I smoothly stop the animation, to avoid sudden jumps in and then continue the animation again from the point at which it left off?

Answer 1

You can achieve this using only CSS.

All that you need is a little movement to make it smooth.

So, I set a transform translate when needed. And this transform is transitioned with an ease-out, to produce the smoothing effect.

So, when hovering, the animation stops (suddenly). But at the same time, a the transform translate is applied, and since this transform is transitioned with the appropiate easing, it starts immediately with the same speed that had the animation.

This speed will slowdown according to the easing, until it stops.

I add a wrapper in the element that has the translate applied. To avoid that this transform "moves" the element, we need to make the element bigger than the visible space, and set inside the wrapper that will limit the visible part (that will be static)

Just hover on the globe. (look ma, no JS)

 @keyframes mapfront_spin {
    0% {        background-position: 1400px 0%;    }
    100% {        background-position: 0 0%;    }
}
@keyframes mapback_spin {
    0% {        background-position: 0 0%;    }
    100% {        background-position: 1400px 0%;    }
}
@-webkit-keyframes mapfront_spin {
    0% {        background-position: 1400px 0%;    }
    100% {        background-position: 0 0%;    }
}
@-webkit-keyframes mapback_spin {
    0% {        background-position: 0 0%;    }
    100% {        background-position: 1400px 0%;    }
}
body {
    margin: 50px;
    background: #000;
}
.globe {
    width: 400px;
    height: 400px;
    position: relative;
}
.front {
    width: 400px;
    height: 400px;
    background: url(http://dl.dropboxusercontent.com/u/17180596/SphereForeground.png);
    z-index: 5;
    position: absolute;
    top: 0;
    left: 0;
}
.back {
    width: 400px;
    height: 400px;
    background: url(http://dl.dropboxusercontent.com/u/17180596/SphereBackground.png);
    z-index: 2;
    position: absolute;
    top: 0;
    left: 0;
}
.mapfront, .mapback {
    border-radius: 300px;
    width: 340px;
    height: 340px;
    position: absolute;
    top: 30px;
    left: 30px;
    z-index: 4;
    overflow: hidden;
}
.mapfront-inner {
    width: 380px;
    height: 340px;
    top: 0px;
    left: 0px;
    position: absolute;
    background: url(http://dl.dropboxusercontent.com/u/17180596/CartoForeground.png) repeat-x;
    transition: transform 1s ease-out;
}
.mapfront-anim {
    -webkit-animation: mapfront_spin 15s linear infinite;
    animation: mapfront_spin 15s linear infinite;
}
.globe:hover .mapfront-anim,
.globe:hover .mapback-anim 
{
    -webkit-animation-play-state: paused;
    animation-play-state: paused;
}
.globe:hover .mapfront-inner {
    transform: translateX(-40px);
}

.mapback-inner {
    width: 380px;
    height: 340px;
    top: 0px;
    left: -40px;
    background: url(http://dl.dropboxusercontent.com/u/17180596/CartoBackground.png) repeat-x;
    position: absolute;
    transition: transform 1s ease-out;
}
.globe:hover .mapback-inner {
    transform: translateX(40px);
}

.mapback-anim {
    -webkit-animation: mapback_spin 15s linear infinite;
    animation: mapback_spin 15s linear infinite;
}

<div class="globe">
    <div class="front"></div>
    <div class="mapfront">
        <div class="mapfront-inner mapfront-anim">
        </div>
    </div>
    <div class="mapback">
        <div class="mapback-inner  mapback-anim">
        </div>
    </div>
    <div class="back"></div>
</div>