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CSS 基礎(chǔ)形狀繪制

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:

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#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四方形(長寬)

#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 via Alexander Futekov


#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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