css keyframe transform not rotating more than 180 degrees - html

Question

I am trying to build a donut chart with css. I am observing that it is unable to rotate more than 180 degrees. Am I missing anything.
This stops me to show donut chart for any data which is more than 50%.
http://jsfiddle.net/BkJY7/80/
#-webkit-keyframes rotate-rt {
0% { -webkit-transform: rotate(0deg); }
25% { -webkit-transform: rotate(360deg); }
100% { -webkit-transform: rotate(360deg); }
}

Answer 1

You are missing the keyframes for rotate-lt.
Also, some minor adjustments on the angles:
body {
margin: 50px;
}
.spinner {
width: 250px;
height: 250px;
background: #aaa;
margin: 0 auto;
position: relative;
}
.spinner:after {
position: absolute;
content: "";
width: 0%;
height: 0%;
border-radius: 100%;
background: #fff;
top: 10%;
left: 10%;
}
.spinner span em {
background: #0e728e;
-webkit-animation-duration: 6s;
}
#-webkit-keyframes rotate-rt {
0% { -webkit-transform: rotate(0deg); }
50% { -webkit-transform: rotate(180deg); }
100% { -webkit-transform: rotate(180deg); }
}
#-webkit-keyframes rotate-lt {
0% { -webkit-transform: rotate(0deg); }
50% { -webkit-transform: rotate(0deg); }
100% { -webkit-transform: rotate(180deg); }
}
.spinner {
border-radius: 100%;
position: relative;
}
.spinner span {
width: 50%;
height: 100%;
overflow: hidden;
position: absolute;
}
.spinner span:first-child {
left: 0;
}
.spinner span:last-child {
left: 50%;
}
.spinner span em {
border-radius: 250px;
position: absolute;
width: 100%;
height: 100%;
-webkit-animation-iteration-count: 1;
-webkit-animation-timing-function: linear;
-webkit-animation-fill-mode: forwards;
}
.spinner span:first-child em {
left: 100%;
border-top-left-radius: 0;
border-bottom-left-radius: 0;
-webkit-animation-name: rotate-lt;
-webkit-transform-origin: 0 50%;
}
.spinner span:last-child em {
left: -100%;
border-top-right-radius: 0;
border-bottom-right-radius: 0;
-webkit-animation-name: rotate-rt;
-webkit-transform-origin: 100% 50%;
}
<div class="spinner">
<span><em></em></span>
<span><em></em></span>
</div>

Answer 2

I would try to use this from css-tricks to achieve what you want:
https://codepen.io/HugoGiraudel/pen/BHEwo
Tutorial:
https://css-tricks.com/css-pie-timer/
html:
<div class="wrapper">
<div class="pie spinner"></div>
<div class="pie filler"></div>
<div class="mask"></div>
</div>
css:
.wrapper {
position: relative;
margin: 40px auto;
background: white;
}
.wrapper, .wrapper * {
-moz-box-sizing: border-box;
-webkit-box-sizing: border-box;
box-sizing: border-box;
}
.wrapper {
width: 250px;
height: 250px;
}
.wrapper .pie {
width: 50%;
height: 100%;
transform-origin: 100% 50%;
position: absolute;
background: #08C;
border: 5px solid rgba(0,0,0,0.5);
}
.wrapper .spinner {
border-radius: 100% 0 0 100% / 50% 0 0 50%;
z-index: 200;
border-right: none;
animation: rota 5s linear infinite;
}
.wrapper:hover .spinner,
.wrapper:hover .filler,
.wrapper:hover .mask {
animation-play-state: running;
}
.wrapper .filler {
border-radius: 0 100% 100% 0 / 0 50% 50% 0;
left: 50%;
opacity: 0;
z-index: 100;
animation: opa 5s steps(1, end) infinite reverse;
border-left: none;
}
.wrapper .mask {
width: 50%;
height: 100%;
position: absolute;
background: inherit;
opacity: 1;
z-index: 300;
animation: opa 5s steps(1, end) infinite;
}
#keyframes rota {
0% {
transform: rotate(0deg);
}
100% {
transform: rotate(360deg);
}
}
#keyframes opa {
0% {
opacity: 1;
}
50%, 100% {
opacity: 0;
}
}
Also you can check this out also nice tutorial:
http://javabeat.net/pie-chart-css3-html/
Keep in mind I take no credit for writing this code, just helpin.

Answer 3

you add keyframe only for rotate-rt that why its rotate half
add a keyframe for rotate-lt so get the better result
#-webkit-keyframes rotate-lt {
0% { -webkit-transform: rotate(0deg); }
25% { -webkit-transform: rotate(180deg); }
100% { -webkit-transform: rotate(360deg); }
}