CSS 3形状：“逆圆”或“剪切圆” [英] CSS 3 Shape: "Inverse Circle" or "Cut Out Circle"

问题描述

我想创建一个形状，我将其描述为反转圆：

该图像有点不准确，因为黑线应该沿着div元素的外边界继续。 / p>

这里是我目前的演示： http： //jsfiddle.net/n9fTF/

没有图片， CSS / p>

解决方案

更新：CSS3径向背景渐变选项

支持它 - 在FF和Chrome - IE10中测试，Safari也应该工作。）

我的原始答案的一个问题是那些没有他们正在反对的坚实背景。此更新创建相同的效果，允许圆形和它的反切割之间的透明间隙。

查看示例小提琴。

CSS

  .inversePair {
 border：1px solid black; 
 display：inline-block; 
 position：relative; 
 height：100px; 
 text-align：center; 
 line-height：100px; 
 vertical-align：middle; 
} 
 
 #a {
 width：100px; 
 border-radius：50px; 
 background：gray; 
 z-index：1; 
} 
 
 #b {
 width：200px; 
 / *需要使用margin / padding调整
基于你想要的gap* / 
 padding-left：30px; 
 margin-left：-30px; 
 / *真正的边界* / 
 border-left：none; 
 -webkit-border-top-right-radius：20px; 
 -webkit-border-bottom-right-radius：20px; 
 -moz-border-radius-topright：20px; 
 -moz-border-radius-bottomright：20px; 
 border-top-right-radius：20px; 
 border-bottom-right-radius：20px; 
 / *反圆cut* / 
 background-image：-moz-radial-gradient（
 -23px 50％，/ * -23px左位置因 * / 
圆最近角，/ *保持半径到一半高度* / 
透明0，/ *透明中心* / 
透明55px，/ * / 
 black 56px，/ *开始圈border* / 
 grey 57px / *结束圆圈边框和背景其余部分的开始颜色* / 
）; 
 background-image：-webkit-radial-gradient（-23px 50％，circle closest-corner，rgba（0，0，0，0）0，rgba（0，0，0，0）55px，black 56px，gray 57px）; 
 background-image：-ms-radial-gradient（-23px 50％，circle closest-corner，rgba（0，0，0，0）0，rgba（0，0，0，0）55px，black 56px，gray 57px）; 
 background-image：-o-radial-gradient（-23px 50％，circle closest-corner，rgba（0，0，0，0）0，rgba（0，0，0，0）55px，black 56px，gray 57px）; 
 background-image：radial-gradient（-23px 50％，circle closest-corner，rgba（0，0，0，0）0，rgba（0，0，0，0）55px，black 56px，gray 57px）; 
} 
  

原始回答

比我预期的z-indexing工作更多的努力（这似乎忽略负z-index ），但是， 这给了一个干净的外观 （测试在IE9，FF，Chrome）：

HTML

 code>< div id =aclass =inversePair> A< / div> 
< div id =bclass =inversePair> B< / div> 
  

CSS

< pre class =lang-css prettyprint-override> .inversePair {
border：1px solid black;
background：gray;
display：inline-block;
position：relative;
height：100px;
text-align：center;
line-height：100px;
vertical-align：middle;
}

#a {
width：100px;
border-radius：50px;
}

#a：before {
content：'';
left：-6px;
top：-6px;
position：absolute;
z-index：-1;
width：112px; / * 5px gap * /
height：112px;
border-radius：56px;
background-color：white;
}

#b {
width：200px;
z-index：-2;
padding-left：50px;
margin-left：-55px;
overflow：hidden;
-webkit-border-top-right-radius：20px;
-webkit-border-bottom-right-radius：20px;
-moz-border-radius-topright：20px;
-moz-border-radius-bottomright：20px;
border-top-right-radius：20px;
border-bottom-right-radius：20px;
}

#b：before {
content：'';
left：-58px;
top：-7px;
position：absolute;
width：114px; / * 5px gap，1px border * /
height：114px;
border-radius：57px;
background-color：black;
}


I want to create a shape, which i would describe as "inverse circle":

The image is somehow inaccurate, because the black line should continue along the outer border of the div element.

Here is a demo of what i have at the moment: http://jsfiddle.net/n9fTF/

Is that even possible with CSS without images?

解决方案

Update: CSS3 Radial Background Gradient Option

(For those browsers supporting it--tested in FF and Chrome--IE10, Safari should work too).

One "problem" with my original answer is those situations where one does not have a solid background that they are working against. This update creates the same effect allowing for a transparent "gap" between the circle and it's inverse cutout.

See example fiddle.

CSS

.inversePair {
    border: 1px solid black;
    display: inline-block;    
    position: relative;    
    height: 100px;
    text-align: center;
    line-height: 100px;
    vertical-align: middle;
}

#a {
    width: 100px;
    border-radius: 50px;
    background: grey;
    z-index: 1;
}

#b {
    width: 200px;
    /* need to play with margin/padding adjustment
       based on your desired "gap" */
    padding-left: 30px;
    margin-left: -30px;
    /* real borders */
    border-left: none;
    -webkit-border-top-right-radius: 20px;
    -webkit-border-bottom-right-radius: 20px;
    -moz-border-radius-topright: 20px;
    -moz-border-radius-bottomright: 20px;
    border-top-right-radius: 20px;
    border-bottom-right-radius: 20px;
    /* the inverse circle "cut" */
    background-image: -moz-radial-gradient(
        -23px 50%, /* the -23px left position varies by your "gap" */
        circle closest-corner, /* keep radius to half height */
        transparent 0, /* transparent at center */
        transparent 55px, /*transparent at edge of gap */
        black 56px, /* start circle "border" */
        grey 57px /* end circle border and begin color of rest of background */
    );
    background-image: -webkit-radial-gradient(-23px 50%, circle closest-corner, rgba(0, 0, 0, 0) 0, rgba(0, 0, 0, 0) 55px, black 56px, grey 57px);
    background-image: -ms-radial-gradient(-23px 50%, circle closest-corner, rgba(0, 0, 0, 0) 0, rgba(0, 0, 0, 0) 55px, black 56px, grey 57px);
    background-image: -o-radial-gradient(-23px 50%, circle closest-corner, rgba(0, 0, 0, 0) 0, rgba(0, 0, 0, 0) 55px, black 56px, grey 57px);
    background-image: radial-gradient(-23px 50%, circle closest-corner, rgba(0, 0, 0, 0) 0, rgba(0, 0, 0, 0) 55px, black 56px, grey 57px);
}

Original Answer

Took more effort than I expected to get the z-indexing to work (this seems to ignore the negative z-index), however, this gives a nice clean look (tested in IE9, FF, Chrome):

HTML

<div id="a" class="inversePair">A</div>
<div id="b" class="inversePair">B</div>

CSS

.inversePair {
    border: 1px solid black;
    background: grey;
    display: inline-block;    
    position: relative;    
    height: 100px;
    text-align: center;
    line-height: 100px;
    vertical-align: middle;
}

#a {
    width: 100px;
    border-radius: 50px;
}

#a:before {
    content:' ';
    left: -6px;
    top: -6px;
    position: absolute;
    z-index: -1;
    width: 112px; /* 5px gap */
    height: 112px;
    border-radius: 56px;
    background-color: white;
} 

#b {
    width: 200px;
    z-index: -2;
    padding-left: 50px;
    margin-left: -55px;
    overflow: hidden;
    -webkit-border-top-right-radius: 20px;
    -webkit-border-bottom-right-radius: 20px;
    -moz-border-radius-topright: 20px;
    -moz-border-radius-bottomright: 20px;
    border-top-right-radius: 20px;
    border-bottom-right-radius: 20px;
}

#b:before {
    content:' ';
    left: -58px;
    top: -7px;
    position: absolute;
    width: 114px; /* 5px gap, 1px border */
    height: 114px;
    border-radius: 57px;
    background-color: black;
} 

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