Using CSS3 transforms/animations with font-face produces “wobbly” spinner gif-like

Question

I\'m using CSS transforms/animations with font-face (twitter bootstrap/font-awesome) to produce a spinner gif-like icon.

The problem is that the icon wobbles as it revol

Answer 1

I don't see it documented in the pages at Font Awesome's site, but the CSS source shows an icon-spin class which rotates an icon endlessly, and for your icon-repeat logo, has virtually no wobble.

<i class="icon-repeat icon-spin"></i>

...though I'm guessing it's really intended for the icon-spinner icon:

<i class="icon-spinner icon-spin"></i>

Edit: d'oh... this relies on a more recent font-awesome.css than the one in your example. So maybe the answer is just that they fixed the wobble themselves. The icon-spin class is new though.

Answer 2

How I solved my issue with out-of-center rotation of icon font: There were several issues I had to resolve: 1. size of icon: it has to be whole px size (e.g. font-size:small; makes my icon 17.5px so center is not absolute center for transformation) 2. defining display: block on icon level makes it center correctly in the middle of the parent div 3. defining exact square size of parent div (in my case button) and fixed padding made it center correctly 4. adding any text-shadow will change the size of the inner icon so it will be out of the center. Trick is to change the hover style to be the same shadow with color same as background in my case

So here is the code:

CSS:

button.close {
padding: 10px;
opacity: 0.8;
text-shadow: 1px 1px 1px #999; 
width: 40px;
height: 40px;
}
button.close i{
font-size: 20px;
max-width: 20px;
max-height: 20px;
display: block;
}
button.close:hover {
text-shadow: 1px 1px 1px #fff; 
}
/* rotation CSS*/
@keyframes anim-rotate {
0% {
-moz-transform:rotate(0);
-webkit-transform:rotate(0);
transform:rotate(0);
}
100% {
-moz-transform: rotate(360deg);
-webkit-transform: rotate(360deg);
transform: rotate(360deg);
}
}
@keyframes anim-rotate-next {
0% {
-moz-transform:rotate(0);
-webkit-transform:rotate(0);
transform:rotate(0);
}
100% {
-moz-transform: rotate(360deg);
-webkit-transform: rotate(360deg);
transform: rotate(360deg);
}
}
.rotate{
animation: anim-rotate-next 1s normal linear;
}
.rotate.down{
animation: anim-rotate 1s normal linear;
}

HTML:

<button type="button" class="close"><i class="lnr lnr-sync rotate"></i></button>

and finally JQuery for switching rotate class JQuery:

$("#parentDiv").on('click', 'i.lnr-sync', function () {
// rotiraj ikonu
$(this).toggleClass("down");
});

Answer 3

Try setting a specific height and width on the element. Through trial and error, I found that adding:

#iconRepeatMain {
    width: 26px;
    height: 19px;
}

centers the font pretty well and seems to eliminate the wobbling. However, it's possible this is dependent on which browser is being used -- test it thoroughly.

http://jsfiddle.net/mblase75/pGhFX/13/

Answer 4

By default, CSS transforms things about their vertical and horizontal center with the property transform-origin. A short-hand syntax for this default value is 50% 50%, which represents the x and then y value of the origin.

For this icon, I found that shifting the y origin to 38% smooths it out a bit, but you'll need to play around with it to get the precise values. View on JSFiddle

i.icon-repeat {
  -webkit-transform-origin:50% 38%;
  -moz-transform-origin:50% 38%;
  -ms-transform-origin:50% 38%;
  -o-transform-origin:50% 38%;
  transform-origin: 50% 38%;
}

For more on the transform-origin property, I recommend the MDN article on the property.