Here's a unique way to achieve a heartbeat effect on a spinning circle. The goal is to have the circle double in size every second and then shrink back to its original size, resembling a heartbeat. To achieve this, a JavaScript timer is set up to remove and immediately add a class that triggers the growth effect. However, the desired "heartbeat" effect only occurs once.
Additionally, the aim is to have the circle spin at a constant speed without slowing down at the end or starting slowly. Currently, the animation has a noticeable slowdown towards the end.
// set timeout
let tid = setTimeout(mycode, 1000);
function mycode() {
// do some stuff...
let ic = document.getElementById('inner-circle')
ic.classList.remove('heartbeat')
ic.classList.add('heartbeat')
tid = setTimeout(mycode, 1000); // repeat myself
}
function abortTimer() { // to be called when you want to stop the timer
clearTimeout(tid);
}#spinning-circle {
animation-name: spinning-circle;
animation-duration: 10s;
animation-iteration-count: infinite;
width: 40px;
height: 40px;
}
.heartbeat {
width: 100%;
height: 100%;
animation-name: heartbeat;
animation-duration: 0.15s;
animation-iteration-count: 2;
animation-direction: alternate;
animation-fill-mode: both;
}
#inner-circle img {
width: 100%;
height: auto;
}
@-webkit-keyframes heartbeat {
100% {
transform: scale(2,2);
-webkit-transform: scale(2,2);
}
}
@-webkit-keyframes spinning-circle {
0% {
-webkit-transform: rotate(0deg);
transform: rotate(0deg);
}
100% {
-webkit-transform: rotate(360deg);
transform: rotate(360deg);
}
}<div id="spinning-circle">
<div id='inner-circle'>
<img src="https://i.sstatic.net/WbNlQ.jpg">
</div>
</div>