Code example for implementing circle and border rotation animation using css

The content of this article is about code examples for realizing circles and borders in CSS. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Achievement effect:

##Code

html:

<div>
    <div>
        <div> </div>
    </div>
    <div>
    </div>
    <div>
    </div>
</div>

css:

     #box {
        height:200px;
        width:200px;
    }

    .circle-out{
        height: inherit;
        width: inherit;

        display: inline-block;
        text-align: center;

        border: 20px solid blue;
        border-radius: 50%;
        
    }

    /* 绘制弧形 */
    .circle-part{
        display: inline-block;
        position: relative;
        width:0px;
        height: 0px;

        border-radius: 50%;
        border: 100px solid #0000ff05;
        border-top: 100px solid blue;

        top: -220px;
        left: 20px;

        transform: rotate(0deg);
        animation: run-part 5s infinite;
    }

    .part1{
        height: 0px;
        width: 0px;

        border-radius: 50%;
        border:100px solid #fafafa;
        border-top: 100px solid #ff000000;

        position: relative;
        top: -420px;
        left: 20px;

        transform: rotate(45deg);
        animation: run-part1 5s infinite;
    }

    .circle-inner{
        height: 0px;
        width: 0px;
        display: inline-block;

        border-radius: 50%;
        border: 20px solid blue;

        top: 80px;
        position: relative;
        
        z-index: 1000;
    }

    @-webkit-keyframes run-part1{
        0%{
            transform: rotate(45deg);
        }

        100% {
            transform: rotate(405deg);
        }
    }

    @-webkit-keyframes run-part{
        0%{
            transform: rotate(0deg);
        }

        100% {
            transform: rotate(360deg);
        }
    }

Implementation ideas

1 Graphic composition

From the appearance, the graphic is roughly composed of: outer circle, inner circle and sector shape.

1.1 Outer circle

In this example, a

p is mainly used to set the height and width, and the background is not set or white. Set border-radius to 50% of the outer circle, and use border composition to form the outer circle.

.circle-out{
    height: inherit;
    width: inherit;
    border: 20px solid blue;
    display: inline-block;
    border-radius: 50%;
    text-align: center;
}

Rendering:

##1.2 Inner circle

The inner circle is very simple. It is also a circle completed using border. Setting

boder-radius:50%

achieves the circle effect. Finally, it is a matter of positioning. 1.3 Sector

Sector, in this example, the idea of ​​implementation is also to piece together, add rotation, and use the border

border

to achieve it. <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">  .circle-part{         //(1)         display: inline-block;         width:0px;         height: 0px;         //(2)         border-radius: 50%;         border: 100px solid #0000ff05;         border-top: 100px solid blue;                  //(3)         position: relative;         top: -220px;         left: 20px;         //(4)         transform: rotate(0deg);         animation: run-part 5s infinite;     }</pre><div class="contentsignin">Copy after login</div></div>The above code:

It is divided into parts (1), (2), (3), and (4). Apart from fixed shapes and animations, the more important part is (2).

First draw the circle (border) of

1/4

. Other sectors of 3/4 are drawn transparently. The same, use another circle for the same processing, so that the two circles can overlap together, the only difference is: the second circle sets the

3/4

circle As white, 1/4 is set to transparent color. At this time, a fan shape of

1/4

is presented, with the background being blue, and 1/4 is completely exposed due to transparency. Finally, since the last circle is the top-level element, when the top-level element is rotated, the blue fan-shaped part will be obscured by the

3/4

fan-shaped area of ​​the top-level element. To achieve the final effect. Add your own animation at the end of the code to achieve the final effect.

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