Code example for implementing circle and border rotation animation using css-CSS Tutorial-php.cn

Code example for implementing circle and border rotation animation using css

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Release： 2018-09-18 14:54:13

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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 example for implementing circle and border rotation animation using css

##Code

html:

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

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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);
        }
    }

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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;
}

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Rendering:

Code example for implementing circle and border rotation animation using css

##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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