在StackOverflow上有這么一個(gè)問題,有位同學(xué)在http://css-tricks.com/examples/ShapesOfCSS/ 找到一些使用CSS做的形狀,其中一位同學(xué)對(duì)下面的這個(gè)形狀充滿了疑問。
形狀是:
代碼是:
1 2 3 4 5 6 7 | #triangle-up { width : 0 ; height : 0 ; border-left : 50px solid transparent ; border-right : 50px solid transparent ; border-bottom : 100px solid red ; } |
這位同學(xué)就提問啦,為啥這么這么幾句就能畫出一個(gè)三角形呢?
于是呢,有人就圖文并茂的解釋了這個(gè)三角的成因
首先呢,我們需要了解HTML標(biāo)記的盒模型(Box Model),這個(gè)例子中呢我們將content,padding都看作content。忽略掉margin。那么一個(gè)盒模型就是下圖
中間是內(nèi)容,然后是4條邊。每一條邊都有寬度。
根據(jù)上面CSS的定義,沒有頂邊(border-top)的情形下 ,我們的圖形如下:
寬度(width)設(shè)置為0后 ,內(nèi)容沒有了就成為下圖:
高度(height)也設(shè)置為0,只有底邊了。
然后兩條邊都是設(shè)置為透明,最后我們就得到了
這個(gè)屬于奇技淫巧,但是也說明CSS的強(qiáng)大,沒有做不到只有想不到。
可用CSS繪制的圖形示例,括號(hào)里是要點(diǎn)
All of the below use only a single HTML element. Any kind of CSS goes, as long as it's supported in at least one browser.
#square {
width: 100px;
height: 100px;
background: red;
}
Rectangle長方形(長寬)
#rectangle {
width: 200px;
height: 100px;
background: red;
}
Circle圓(邊角圓角)
#circle {
width: 100px;
height: 100px;
background: red;
-moz-border-radius: 50px;
-webkit-border-radius: 50px;
border-radius: 50px;
}
Oval橢圓(長寬 邊角圓角)
#oval {
width: 200px;
height: 100px;
background: red;
-moz-border-radius: 100px / 50px;
-webkit-border-radius: 100px / 50px;
border-radius: 100px / 50px;
}
/* Cleaner, but slightly less support: use "50%" as value */
Triangle Up上三角(左右壓縮中間,只剩下內(nèi)框)
#triangle-up {
width: 0;
height: 0;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-bottom: 100px solid red;
}
Triangle Down下三角(左右壓縮中間,只剩上內(nèi)框)
#triangle-down {
width: 0;
height: 0;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-top: 100px solid red;
}
Triangle Left (上下壓縮中間,只剩右內(nèi)邊)
#triangle-left {
width: 0;
height: 0;
border-top: 50px solid transparent;
border-right: 100px solid red;
border-bottom: 50px solid transparent;
}
Triangle Right (上下壓縮中間,只剩左內(nèi)邊)
#triangle-right {
width: 0;
height: 0;
border-top: 50px solid transparent;
border-left: 100px solid red;
border-bottom: 50px solid transparent;
}
Triangle Top Left(只有上 左內(nèi)框)
#triangle-topleft {
width: 0;
height: 0;
border-top: 100px solid red;
border-right: 100px solid transparent;
}
Triangle Top Right(只有上 右內(nèi)框)
#triangle-topright {
width: 0;
height: 0;
border-top: 100px solid red;
border-left: 100px solid transparent;
}
Triangle Bottom Left(只有左 下內(nèi)框)
#triangle-bottomleft {
width: 0;
height: 0;
border-bottom: 100px solid red;
border-right: 100px solid transparent;
}
Triangle Bottom Right (只有下 右內(nèi)框)
#triangle-bottomright {
width: 0;
height: 0;
border-bottom: 100px solid red;
border-left: 100px solid transparent;
}
Curved Tail Arrow箭頭 (一個(gè)三角,然后旋轉(zhuǎn),作為箭頭,一個(gè)邊角圓角,三角,旋轉(zhuǎn),作為箭把)
#curvedarrow {
position: relative;
width: 0;
height: 0;
border-top: 9px solid transparent;
border-right: 9px solid red;
-webkit-transform: rotate(10deg);
-moz-transform: rotate(10deg);
-ms-transform: rotate(10deg);
-o-transform: rotate(10deg);
}
#curvedarrow:after {
content: "";
position: absolute;
border: 0 solid transparent;
border-top: 3px solid red;
border-radius: 20px 0 0 0;
top: -12px;
left: -9px;
width: 12px;
height: 12px;
-webkit-transform: rotate(45deg);
-moz-transform: rotate(45deg);
-ms-transform: rotate(45deg);
-o-transform: rotate(45deg);
}
Trapezoid(左右內(nèi)框壓縮中間,底部內(nèi)框)
#trapezoid {
border-bottom: 100px solid red;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
height: 0;
width: 100px;
}
Parallelogram(變形)
#parallelogram {
width: 150px;
height: 100px;
-webkit-transform: skew(20deg);
-moz-transform: skew(20deg);
-o-transform: skew(20deg);
background: red;
}
Trapezoid
#trapezoid {
border-bottom: 100px solid red;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
height: 0;
width: 100px;
}
Star (6-points)六角星
#star-six {
width: 0;
height: 0;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-bottom: 100px solid red;
position: relative;
}
#star-six:after {
width: 0;
height: 0;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-top: 100px solid red;
position: absolute;
content: "";
top: 30px;
left: -50px;
}
Star (5-points)
#star-five {
margin: 50px 0;
position: relative;
display: block;
color: red;
width: 0px;
height: 0px;
border-right: 100px solid transparent;
border-bottom: 70px solid red;
border-left: 100px solid transparent;
-moz-transform: rotate(35deg);
-webkit-transform: rotate(35deg);
-ms-transform: rotate(35deg);
-o-transform: rotate(35deg);
}
#star-five:before {
border-bottom: 80px solid red;
border-left: 30px solid transparent;
border-right: 30px solid transparent;
position: absolute;
height: 0;
width: 0;
top: -45px;
left: -65px;
display: block;
content: '';
-webkit-transform: rotate(-35deg);
-moz-transform: rotate(-35deg);
-ms-transform: rotate(-35deg);
-o-transform: rotate(-35deg);
}
#star-five:after {
position: absolute;
display: block;
color: red;
top: 3px;
left: -105px;
width: 0px;
height: 0px;
border-right: 100px solid transparent;
border-bottom: 70px solid red;
border-left: 100px solid transparent;
-webkit-transform: rotate(-70deg);
-moz-transform: rotate(-70deg);
-ms-transform: rotate(-70deg);
-o-transform: rotate(-70deg);
content: '';
}
Pentagon
#pentagon {
position: relative;
width: 54px;
border-width: 50px 18px 0;
border-style: solid;
border-color: red transparent;
}
#pentagon:before {
content: "";
position: absolute;
height: 0;
width: 0;
top: -85px;
left: -18px;
border-width: 0 45px 35px;
border-style: solid;
border-color: transparent transparent red;
}
Hexagon
#hexagon {
width: 100px;
height: 55px;
background: red;
position: relative;
}
#hexagon:before {
content: "";
position: absolute;
top: -25px;
left: 0;
width: 0;
height: 0;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-bottom: 25px solid red;
}
#hexagon:after {
content: "";
position: absolute;
bottom: -25px;
left: 0;
width: 0;
height: 0;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-top: 25px solid red;
}
Octagon
#octagon {
width: 100px;
height: 100px;
background: red;
position: relative;
}
#octagon:before {
content: "";
position: absolute;
top: 0;
left: 0;
border-bottom: 29px solid red;
border-left: 29px solid #eee;
border-right: 29px solid #eee;
width: 42px;
height: 0;
}
#octagon:after {
content: "";
position: absolute;
bottom: 0;
left: 0;
border-top: 29px solid red;
border-left: 29px solid #eee;
border-right: 29px solid #eee;
width: 42px;
height: 0;
}
Heart
#heart {
position: relative;
width: 100px;
height: 90px;
}
#heart:before,
#heart:after {
position: absolute;
content: "";
left: 50px;
top: 0;
width: 50px;
height: 80px;
background: red;
-moz-border-radius: 50px 50px 0 0;
border-radius: 50px 50px 0 0;
-webkit-transform: rotate(-45deg);
-moz-transform: rotate(-45deg);
-ms-transform: rotate(-45deg);
-o-transform: rotate(-45deg);
transform: rotate(-45deg);
-webkit-transform-origin: 0 100%;
-moz-transform-origin: 0 100%;
-ms-transform-origin: 0 100%;
-o-transform-origin: 0 100%;
transform-origin: 0 100%;
}
#heart:after {
left: 0;
-webkit-transform: rotate(45deg);
-moz-transform: rotate(45deg);
-ms-transform: rotate(45deg);
-o-transform: rotate(45deg);
transform: rotate(45deg);
-webkit-transform-origin: 100% 100%;
-moz-transform-origin: 100% 100%;
-ms-transform-origin: 100% 100%;
-o-transform-origin: 100% 100%;
transform-origin :100% 100%;
}
Infinity
#infinity {
position: relative;
width: 212px;
height: 100px;
}
#infinity:before,
#infinity:after {
content: "";
position: absolute;
top: 0;
left: 0;
width: 60px;
height: 60px;
border: 20px solid red;
-moz-border-radius: 50px 50px 0 50px;
border-radius: 50px 50px 0 50px;
-webkit-transform: rotate(-45deg);
-moz-transform: rotate(-45deg);
-ms-transform: rotate(-45deg);
-o-transform: rotate(-45deg);
transform: rotate(-45deg);
}
#infinity:after {
left: auto;
right: 0;
-moz-border-radius: 50px 50px 50px 0;
border-radius: 50px 50px 50px 0;
-webkit-transform: rotate(45deg);
-moz-transform: rotate(45deg);
-ms-transform: rotate(45deg);
-o-transform: rotate(45deg);
transform: rotate(45deg);
}
Diamond Square
#diamond {
width: 0;
height: 0;
border: 50px solid transparent;
border-bottom-color: red;
position: relative;
top: -50px;
}
#diamond:after {
content: '';
position: absolute;
left: -50px;
top: 50px;
width: 0;
height: 0;
border: 50px solid transparent;
border-top-color: red;
}
Diamond Shield
#diamond-shield {
width: 0;
height: 0;
border: 50px solid transparent;
border-bottom: 20px solid red;
position: relative;
top: -50px;
}
#diamond-shield:after {
content: '';
position: absolute;
left: -50px; top: 20px;
width: 0;
height: 0;
border: 50px solid transparent;
border-top: 70px solid red;
}
Diamond Narrow
#diamond-narrow {
width: 0;
height: 0;
border: 50px solid transparent;
border-bottom: 70px solid red;
position: relative;
top: -50px;
}
#diamond-narrow:after {
content: '';
position: absolute;
left: -50px; top: 70px;
width: 0;
height: 0;
border: 50px solid transparent;
border-top: 70px solid red;
}
#cut-diamond {
border-style: solid;
border-color: transparent transparent red transparent;
border-width: 0 25px 25px 25px;
height: 0;
width: 50px;
position: relative;
margin: 20px 0 50px 0;
}
#cut-diamond:after {
content: "";
position: absolute;
top: 25px;
left: -25px;
width: 0;
height: 0;
border-style: solid;
border-color: red transparent transparent transparent;
border-width: 70px 50px 0 50px;
}
Egg
#egg {
display:block;
width: 126px;
height: 180px;
background-color: red;
-webkit-border-radius: 63px 63px 63px 63px / 108px 108px 72px 72px;
border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
}
Pac-Man
#pacman {
width: 0px;
height: 0px;
border-right: 60px solid transparent;
border-top: 60px solid red;
border-left: 60px solid red;
border-bottom: 60px solid red;
border-top-left-radius: 60px;
border-top-right-radius: 60px;
border-bottom-left-radius: 60px;
border-bottom-right-radius: 60px;
}
Talk Bubble
#talkbubble {
width: 120px;
height: 80px;
background: red;
position: relative;
-moz-border-radius: 10px;
-webkit-border-radius: 10px;
border-radius: 10px;
}
#talkbubble:before {
content:"";
position: absolute;
right: 100%;
top: 26px;
width: 0;
height: 0;
border-top: 13px solid transparent;
border-right: 26px solid red;
border-bottom: 13px solid transparent;
}
12 Point Burst
#burst-12 {
background: red;
width: 80px;
height: 80px;
position: relative;
text-align: center;
}
#burst-12:before, #burst-12:after {
content: "";
position: absolute;
top: 0;
left: 0;
height: 80px;
width: 80px;
background: red;
}
#burst-12:before {
-webkit-transform: rotate(30deg);
-moz-transform: rotate(30deg);
-ms-transform: rotate(30deg);
-o-transform: rotate(30deg);
}
#burst-12:after {
-webkit-transform: rotate(60deg);
-moz-transform: rotate(60deg);
-ms-transform: rotate(60deg);
-o-transform: rotate(60deg);
}
8 Point Burst
#burst-8 {
background: red;
width: 80px;
height: 80px;
position: relative;
text-align: center;
-webkit-transform: rotate(20deg);
-moz-transform: rotate(20deg);
-ms-transform: rotate(20deg);
-o-transform: rotate(20eg);
}
#burst-8:before {
content: "";
position: absolute;
top: 0;
left: 0;
height: 80px;
width: 80px;
background: red;
-webkit-transform: rotate(135deg);
-moz-transform: rotate(135deg);
-ms-transform: rotate(135deg);
-o-transform: rotate(135deg);
}
Yin Yang
#yin-yang {
width: 96px;
height: 48px;
background: #eee;
border-color: red;
border-style: solid;
border-width: 2px 2px 50px 2px;
border-radius: 100%;
position: relative;
}
#yin-yang:before {
content: "";
position: absolute;
top: 50%;
left: 0;
background: #eee;
border: 18px solid red;
border-radius: 100%;
width: 12px;
height: 12px;
}
#yin-yang:after {
content: "";
position: absolute;
top: 50%;
left: 50%;
background: red;
border: 18px solid #eee;
border-radius:100%;
width: 12px;
height: 12px;
}
Badge Ribbon
#badge-ribbon { position: relative; background: red; height: 100px; width: 100px; -moz-border-radius: 50px; -webkit-border-radius: 50px; border-radius: 50px;}#badge-ribbon:before,#badge-ribbon:after { content: ''; position: absolute; border-bottom: 70px solid red; border-left: 40px solid transparent; border-right: 40px solid transparent; top: 70px; left: -10px; -webkit-transform: rotate(-140deg); -moz-transform: rotate(-140deg); -ms-transform: rotate(-140deg); -o-transform: rotate(-140deg); }#badge-ribbon:after { left: auto; right: -10px; -webkit-transform: rotate(140deg); -moz-transform: rotate(140deg); -ms-transform: rotate(140deg); -o-transform: rotate(140deg); }
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