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,我将其描述为反向圆:
图片有点不准确,因为黑线应该沿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
更新:CSS3径向背景渐变选项
浏览器支持它 - 测试在FF和Chrome - IE10,Safari应该也工作)。
一个问题与我原来的答案是那些情况下,有坚实的背景,他们正在反对。此更新创建相同的效果,允许在圆和它的反切割之间的透明间隙。
请参阅示例小提琴。
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* /
gray 57px / *结束圆圈边框和背景剩余部分的开始颜色* /
);
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指数),但是, 这会给出一个干净的外观 (在IE9,FF,Chrome中测试): p>
HTML
< 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?
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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