如何制作像'行进蚂蚁'一样平滑的虚线边框旋转动画

这是一个如何使用CSS实现cog动画的不同方法.此方法已在IE11,IE10,Firefox,Chrome,Opera和Safari中进行了测试.

两个圆形元件用于齿轮/齿轮与插入box-shadow产生内圈.牙齿由围绕轴线旋转的子元件(正常+伪)产生.

带的弯曲部分使用与齿轮的辐条相同的技术实现,并且定位成使得它们总是位于齿之间.

一个矩形容器元素,其顶部和底部边框使用线性渐变进行模拟.该元素的背景(顶部和底部的渐变除外)是纯色,这是一种缺点.这种纯色用于隐藏两侧的一半圆形元素.

动画以两种方式实现(a)不断旋转圆形元素和(b)不断改变渐变背景的背景位置.

.chain {
    margin: 45px auto;
    height: 100px;
    width: 310px;
    position: relative;
    background: -webkit-linear-gradient(0deg, gold 50%, transparent 50%), -webkit-linear-gradient(0deg, gold 50%, transparent 50%), white;
    background: -moz-linear-gradient(90deg, gold 50%, transparent 50%), -moz-linear-gradient(90deg, gold 50%, transparent 50%), white;
    background: linear-gradient(90deg, gold 50%, transparent 50%), linear-gradient(90deg, gold 50%, transparent 50%), white;
    background-size: 41px 5px;
    background-repeat: repeat-x;
    background-position: 20px 0px, 20px 95px;
    -webkit-animation: bgPos 1s infinite linear;
    -moz-animation: bgPos 1s infinite linear;
    animation: bgPos 1s infinite linear;
}
.belt, .belt-after, .belt .spokes, .belt .spokes:before, .belt .spokes:after, .belt-after .spokes, .belt-after .spokes:before, .belt-after .spokes:after {
    position: absolute;
    content:'';
    height: 90px;
    width:15px;
    top: 0px;
    border-top: 5px solid gold;
    border-bottom: 5px solid gold;
    z-index: -1;
}
.belt, .belt-after {
    -webkit-animation: borderAnim 8s infinite linear;
    -moz-animation: borderAnim 8s infinite linear;
    animation: borderAnim 8s infinite linear;
}
.belt .spokes, .belt-after .spokes {
    top: -5px;
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    transform: rotate(45deg);
}
.belt .spokes:before, .belt-after .spokes:before {
    top: -5px;
    -webkit-transform: rotate(90deg);
    -moz-transform: rotate(90deg);
    transform: rotate(90deg);
}
.belt .spokes:after, .belt-after .spokes:after {
    top: -5px;
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    transform: rotate(45deg);
}
.belt {
    left: -16px;
}
.belt-after {
    right: -16px;
}
.gear {
    content:'';
    position: absolute;
    top: 5px;
    height: 90px;
    width: 90px;
    border-radius: 50%;
    -webkit-animation: borderAnim 8s infinite linear;
    -moz-animation: borderAnim 8s infinite linear;
    animation: borderAnim 8s infinite linear;
    box-shadow: inset 0px 0px 0px 30px gray;
    z-index: 4;
}
.gear:before, .gear .spokes, .gear .spokes:before, .gear .spokes:after {
    position: absolute;
    content:'';
    height: 88px;
    width:15px;
    top: -5px;
    border-top: 6px solid gray;
    border-bottom: 6px solid gray;
}
.gear:before {
    left: 37px;
    -webkit-transform: rotate(22.5deg);
    -moz-transform: rotate(22.5deg);
    transform: rotate(22.5deg);
}
.gear .spokes {
    left: 37px;
    -webkit-transform: rotate(67.5deg);
    -moz-transform: rotate(67.5deg);
    transform: rotate(67.5deg);
}
.gear .spokes:before {
    top: -6px;
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    transform: rotate(45deg);
}
.gear .spokes:after {
    -webkit-transform: rotate(90deg);
    -moz-transform: rotate(90deg);
    transform: rotate(90deg);
}
.chain .belt + .gear {
    left:-52px;
}
.chain .belt-after + .gear {
    right: -52.5px;
}
.gear-small {
    content:'';
    position: absolute;
    left: -92px;
    top: -20px;
    height: 50px;
    width: 50px;
    border-radius: 50%;
    -webkit-animation: borderAnim 6s infinite linear reverse;
    -moz-animation: borderAnim 6s infinite linear reverse;
    animation: borderAnim 6s infinite linear reverse;
    box-shadow: inset 0px 0px 0px 20px gray;
    z-index: -2;
}
.gear-small:before {
    position: absolute;
    content:'';
    left: 21px;
    top: -3px;
    height: 48px;
    width: 10px;
    border-top:4px solid gray;
    border-bottom: 4px solid gray;
}
.gear-small .spokes, .gear-small .spokes:before, .gear-small .spokes:after {
    position: absolute;
    content:'';
    left: 21px;
    top: -3px;
    height: 48px;
    width: 10px;
    border-top:4px solid gray;
    border-bottom: 4px solid gray;
}
.gear-small .spokes {
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    transform: rotate(45deg);
}
.gear-small .spokes:before {
    left: 0px;
    -webkit-transform: rotate(90deg);
    -moz-transform: rotate(90deg);
    transform: rotate(90deg);
}
.gear-small .spokes:after {
    left: 0px;
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    transform: rotate(45deg);
}
@-webkit-keyframes borderAnim {
    0% {
        -webkit-transform: rotate(360deg);
    }
    100% {
        -webkit-transform: rotate(0deg);
    }
}
@-moz-keyframes borderAnim {
    0% {
        -moz-transform: rotate(360deg);
    }
    100% {
        -moz-transform: rotate(0deg);
    }
}
@keyframes borderAnim {
    0% {
        transform: rotate(360deg);
    }
    100% {
        transform: rotate(0deg);
    }
}
@-webkit-keyframes bgPos {
    0% {
        background-position: 20px 0px, -20px 95px;
    }
    100% {
        background-position: -20px 0px, 20px 95px;
    }
}
@-moz-keyframes bgPos {
    0% {
        background-position: 20px 0px, -20px 95px;
    }
    100% {
        background-position: -20px 0px, 20px 95px;
    }
}
@keyframes bgPos {
    0% {
        background-position: 20px 0px, -20px 95px;
    }
    100% {
        background-position: -20px 0px, 20px 95px;
    }
}