是否可以仅使用 HTML5 / CSS3 创建一个圆圈，其边框仅围绕圆圈的一部分？如果不是，我可以使用什么技术来实现这种效果？我更喜欢使用纯 DOM 元素，但如果必须，我可以在画布上绘制或启动 SVG。
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66727 次
8 回答
44
是的，这是可能的 - 看到这个：
演示
.circle {
position: relative;
margin: 7em auto;
width: 16em;
height: 16em;
border-radius: 50%;
background: lightblue;
}
.arc {
overflow: hidden;
position: absolute;
/* make sure top & left values are - the width of the border */
/* the bottom right corner is the centre of the parent circle */
top: -1em;
right: 50%;
bottom: 50%;
left: -1em;
/* the transform origin is the bottom right corner */
transform-origin: 100% 100%;
/* rotate by any angle */
/* the skew angle is 90deg - the angle you want for the arc */
transform: rotate(45deg) skewX(30deg);
}
.arc:before {
box-sizing: border-box;
display: block;
border: solid 1em navy;
width: 200%;
height: 200%;
border-radius: 50%;
transform: skewX(-30deg);
content: '';
}<div class='circle'>
<div class='arc'></div>
</div>于 2012-10-24T23:28:00.170 回答
16
这是可能的。
border-radius使用一个在另一个之上绘制两个圆圈。transparent通过改变来制作两个圆的一个或多个圆弧border-color。- 用于
transform旋转第二个圆圈，您将获得所需大小的弧线。
这是演示：http: //jsfiddle.net/kJXwZ/2/
.wrapper {
position: relative;
margin: 20px;
}
.arc {
position: absolute;
top: 0;
left: 0;
width: 100px;
height: 100px;
border-radius: 100%;
border: 1px solid;
}
.arc_start {
border-color: transparent red red red;
-webkit-transform: rotate(45deg);
-moz-transform: rotate(45deg);
-ms-transform: rotate(45deg);
-o-transform: rotate(45deg);
transform: rotate(45deg);
}
.arc_end {
border-color: red red red transparent;
-webkit-transform: rotate(75deg);
-moz-transform: rotate(75deg);
-ms-transform: rotate(75deg);
-o-transform: rotate(75deg);
transform: rotate(75deg);
}<div class="wrapper">
<div class="arc arc_start"></div>
<div class="arc arc_end"></div>
</div>于 2012-10-24T23:35:42.423 回答
13
这也使用了 JavaScript，因此它打破了原始要求 :(
.. 但是它确实提供了
有一个>>演示<<这里
@gkond 谢谢，我从你的回答中得出这个
// create a circle using HTML5 / CSS3 / JS which has a border that only goes part-way around
// the circle .. and which can be smoothly animated from 0% to 100% around the circle
// this solution allows for animation and still results in relatively clean code
// we use four quarter-circles, all hidden away behind a white square to start with..
// all four are rotated out clockwise, and each quarter will stop at it's own maximum:
// q1 at 25%, q2 at 50% .. etc. once we reach a value at or over 25%, all four quarters
// should be out from behind the white square, and we can hide it.. it needs to be
// hidden if we display a value over 75%, or else q4 will end up going in behind it again
// .. also, since the top border will usually sit between the angles of -45 to 45, we
// rotate everything by an extra -45 to make it all line up with the top nicely
var fromHidden = -90;
// utility function to align 0 degrees with top
// takes degrees and returns degrees - 45
function topAlign(degrees) {
return degrees - 45
};
// utility function to rotate a jQuery element
// takes element and the degree of rotation (from the top)
function rotate(el, degrees) {
var degrees = topAlign(degrees || 0);
el.css(
'transform', 'rotate(' + degrees + 'deg)',
'-webkit-transform', 'rotate(' + degrees + 'deg)',
'-moz-transform', 'rotate(' + degrees + 'deg)',
'-ms-transform', 'rotate(' + degrees + 'deg)',
'-o-transform', 'rotate(' + degrees + 'deg)'
)
}
// function to draw semi-circle
// takes a jQuery element and a value (between 0 and 1)
// element must contain four .arc_q elements
function circle(el, normalisedValue) {
var degrees = normalisedValue * 360; // turn normalised value into degrees
var counter = 1; // keeps track of which quarter we're working with
el.find('.arc_q').each(function() { // loop over quarters..
var angle = Math.min(counter * 90, degrees); // limit angle to maximum allowed for this quarter
rotate($(this), fromHidden + angle); // rotate from the hiding place
counter++; // track which quarter we'll be working with in next pass over loop
});
if (degrees > 90) { // hide the cover-up square soon as we can
el.find('.arc_cover').css('display', 'none');
}
}
// uses the the circle function to 'animate' drawing of the semi-circle
// incrementally increses the value passed by 0.01 up to the value required
function animate(el, normalisedValue, current) {
var current = current || 0;
circle(el, current);
if (current < normalisedValue) {
current += 0.01;
setTimeout(function() {
animate(el, normalisedValue, current);
}, 1);
}
}
// kick things off ..
animate($('.circle'), 0.69);.circle {
position: relative;
margin: 20px;
width: 120px;
height: 120px;
}
.arc_q {
position: absolute;
top: 0;
left: 0;
width: 100px;
height: 100px;
border-radius: 50%;
border: 10px solid;
border-color: transparent green transparent transparent;
transform: rotate(-45deg);
-webkit-transform: rotate(-45deg);
-moz-transform: rotate(-45deg);
-ms-transform: rotate(-45deg);
-o-transform: rotate(-45deg);
}
.arc_cover {
position: absolute;
top: 0;
left: 0;
width: 60px;
height: 60px;
background-color: white;
}<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="circle">
<div class="arc_q"></div>
<div class="arc_q"></div>
<div class="arc_q"></div>
<div class="arc_q"></div>
<div class="arc_cover"></div>
</div>于 2014-02-23T22:02:32.180 回答
3
为此，您可以使用简单的框边框属性，一个元素和一个类。这将是内联、内联块或块处理，具体取决于您放置 easy-circle 类的位置，以及您如何/是否设置位置样式。
<!DOCTYPE html>
<html>
<head>
<style>
.easy-circle {
background: transparent;
border: 1em solid black; /* color not required, may show device fail */
border-color: red green blue transparent;
height: 10em;
width: 10em;
-moz-border-radius: 6em; /* height/2 + border thickness */
-webkit-border-radius: 6em;
border-radius: 50%; /* more than 50, shape-size adjustment irrelevant */
-ms-transform: rotate(45deg); /* IE 9 */
-webkit-transform: rotate(45deg); /* Chrome, Safari, Opera */
transform: rotate(45deg); /* transform optional */
}
</style>
</head>
<body>
<div class="easy-circle">
</div>
</body>
</html>
于 2015-01-26T01:33:37.243 回答
2
这可以通过在透明圆圈周围设置透明边框并使用border-top-color: ;为圆形边框的一部分赋予颜色来实现。
background-color:transparent;
border:3px solid transparent;
border-top-color: green;
这将创建一个仅在上四分之一周围有边框的圆圈；
你也可以使用
border-bottom-color:green;
以及左右边界的圆圆周的不同季度。
这是一个带有 3 个部分圆的装载机的小提琴，这些圆在彼此内部以交替方向旋转，显示了这一点。
于 2018-10-16T15:37:33.223 回答
2
圆锥梯度解（适用于任何度数）：
:root{
--degree:80deg;
--color:red;
}
.a{
height:200px;
width:200px;
border-radius:50%;
background: conic-gradient(
var(--color) var(--degree), transparent calc(var(--degree) + 0.5deg) 100%);
}
.b{
height:84%;
width:84%;
top:8%;
left:8%;
position:relative;
border-radius:50%;
background:#D3D3D3;
}<div class ="a">
<div class="b">
</div>于 2021-03-12T14:02:56.883 回答
0
对此进行动画处理的最简单方法是使用 css 关键帧。
http://jsfiddle.net/8SUPX/644/
/**
* HTML5 / CSS3 Circle with Partial Border
* http://stackoverflow.com/q/13059190/1397351
*/
* { margin: 0; padding: 0; }
.circle {
position: relative;
margin: 6em auto;
width: 12em; height: 12em;
border-radius: 50%;
background: transparent;
border:20px solid #efefef;
border-top-color: #efefef;
border-right-color: #efefef;
border-bottom-color: #efefef;
border-left-color: #efefef;
-webkit-transition:.5s;-moz-transition:.5s;transition:.5s;
}
.circle:hover{
-webkit-animation: animix 0.5s 1;
-webkit-animation-fill-mode: forwards;
-moz-animation: animix 0.5s 1;
-moz-animation-fill-mode: forwards;
animation: animix 0.5s 1;
animation-fill-mode: forwards;
}
//Animate
@-webkit-keyframes animix {
0% {
border-top-color: transparent;
border-right-color: transparent;
border-bottom-color: transparent;
border-left-color: transparent;
}
25% {
border-top-color: red;
border-right-color: transparent;
border-bottom-color: transparent;
border-left-color: transparent;
}
50% {
border-top-color: red;
border-right-color: red;
border-bottom-color: transparent;
border-left-color: transparent;
}
75% {
border-top-color: red;
border-right-color: red;
border-bottom-color: red;
border-left-color: transparent;
}
100% {
border-top-color: red;
border-right-color: red;
border-bottom-color: red;
border-left-color: red;
}
}
@keyframes animix {
0% {
border-top-color: transparent;
border-right-color: transparent;
border-bottom-color: transparent;
border-left-color: transparent;
}
25% {
border-top-color: red;
border-right-color: transparent;
border-bottom-color: transparent;
border-left-color: transparent;
}
50% {
border-top-color: red;
border-right-color: red;
border-bottom-color: transparent;
border-left-color: transparent;
}
75% {
border-top-color: red;
border-right-color: red;
border-bottom-color: red;
border-left-color: transparent;
}
100% {
border-top-color: red;
border-right-color: red;
border-bottom-color: red;
border-left-color: red;
}
}<div class="circle"> </div>于 2015-04-07T21:43:23.013 回答
0
如果你想要双边框，你也可以使用它
div
{
background-color: #ddd;
text-align: center;
display: flex;
align-items: center;
justify-content: center;
font-weight: bold;
font-size: 30px;
margin: 40px auto;
color: black;
width: 200px;
height: 200px;
border-radius: 50%;
position: relative;
}
div::before
{
content: "";
width: 200px;
height: 200px;
border-radius: 50%;
position: absolute;
left: 0;
top: 0;
transform: translate(-10px, -10px);
z-index: -1;
border: 10px solid;
border-color: red red red transparent;
}
body ::after
{
content: "";
width: 220px;
height: 220px;
border-radius: 50%;
position: absolute;
left: 0;
top: 0;
transform: translate(-21px, -22px);
z-index: -8;
border: 12px solid;
background: transparent;
border-color: blue transparent blue blue;
}<div> </div>于 2021-04-27T08:40:18.370 回答