CSS3 简单圆环图

Question

我想做的是创建一个简单的圆环图。我目前只使用 CSS(3)，但我不知道如果没有 javascript 是否可行。

我目前拥有的: http://jsfiddle.net/aBP5Q/

HTML:

<div class="donut-container" style="background: #9C0;">
    <div class="donut-inner">
        <div class="donut-label">HTML</div>
    </div>
</div>

CSS:

.donut-container {
    width: 150px;
    height: 150px;
    float: left;
    -webkit-border-radius: 75px;
    -moz-border-radius: 75px;
    border-radius: 75px;
    margin-right: 20px;
}

.donut-inner {
    width: 134px;
    height: 134px;
    position: relative;
    top: 8px;
    left: 8px;
    background: #FFF;
    -webkit-border-radius: 65px;
    -moz-border-radius: 65px;
    border-radius: 65px;
}

.donut-label {
    line-height: 130px;
    text-align: center;
    font-size: 20px;
}

我想显示绿色和蓝色作为百分比。所以没有绿色是 0%，全绿色(360 度)是 100%。如果可能的话，甚至可以在加载图表时使用简单的动画。

非常感谢您的帮助。

Answer 1

SVG 获胜!

.item {
    position: relative;
    float: left;
}

.item h2 {
    text-align:center;
    position: absolute;
    line-height: 125px;
    width: 100%;
}

svg {
   -webkit-transform: rotate(-90deg);
    transform: rotate(-90deg);
}

.circle_animation {
  stroke-dasharray: 440; /* this value is the pixel circumference of the circle */
  stroke-dashoffset: 440;
}

.html .circle_animation {
    -webkit-animation: html 1s ease-out forwards;
    animation: html 1s ease-out forwards;
}

.css .circle_animation {
    -webkit-animation: css 1s ease-out forwards;
    animation: css 1s ease-out forwards;
}

@-webkit-keyframes html {
  to {
    stroke-dashoffset: 80; /* 50% would be 220 (half the initial value specified above) */
  }
}

@keyframes html {
  to {
    stroke-dashoffset: 80;
  }
}

@-webkit-keyframes css {
  to {
    stroke-dashoffset: 160;
  }
}

@keyframes css {
  to {
    stroke-dashoffset: 160;
  }
}

<div class="item html">
    <h2>HTML</h2>
    <svg width="160" height="160" xmlns="http://www.w3.org/2000/svg">
     <g>
      <title>Layer 1</title>
      <circle class="circle_animation" r="69.85699" cy="81" cx="81" stroke-width="8" stroke="#6fdb6f" fill="none"/>
     </g>
    </svg>
</div>

<div class="item css">
    <h2>CSS</h2>
    <svg width="160" height="160" xmlns="http://www.w3.org/2000/svg">
     <g>
      <title>Layer 1</title>
      <circle class="circle_animation" r="69.85699" cy="81" cx="81" stroke-width="8" stroke="#69aff4" fill="none"/>
     </g>
    </svg>
</div>

JSFiddle version

---

这是评论中要求的带有背景圆圈的版本:

.item {
    position: relative;
    float: left;
}

.item h2 {
    text-align:center;
    position: absolute;
    line-height: 125px;
    width: 100%;
}

svg {
   -webkit-transform: rotate(-90deg);
    transform: rotate(-90deg);
}

.circle_animation {
  stroke-dasharray: 440; /* this value is the pixel circumference of the circle */
  stroke-dashoffset: 440;
}

.html .circle_animation {
    -webkit-animation: html 1s ease-out forwards;
    animation: html 1s ease-out forwards;
}

.css .circle_animation {
    -webkit-animation: css 1s ease-out forwards;
    animation: css 1s ease-out forwards;
}

@-webkit-keyframes html {
  to {
    stroke-dashoffset: 80; /* 50% would be 220 (half the initial value specified above) */
  }
}

@keyframes html {
  to {
    stroke-dashoffset: 80;
  }
}

@-webkit-keyframes css {
  to {
    stroke-dashoffset: 160;
  }
}

@keyframes css {
  to {
    stroke-dashoffset: 160;
  }
}

<div class="item html">
    <h2>HTML</h2>
    <svg width="160" height="160" xmlns="http://www.w3.org/2000/svg">
     <g>
      <title>Layer 1</title>
      <circle r="69.85699" cy="81" cx="81" stroke-width="8" stroke="#f2f2f2" fill="none"/>
      <circle class="circle_animation" r="69.85699" cy="81" cx="81" stroke-width="8" stroke="#6fdb6f" fill="none"/>
     </g>
    </svg>
</div>

<div class="item css">
    <h2>CSS</h2>
    <svg width="160" height="160" xmlns="http://www.w3.org/2000/svg">
     <g>
      <title>Layer 1</title>
      <circle r="69.85699" cy="81" cx="81" stroke-width="8" stroke="#f2f2f2" fill="none"/>
      <circle class="circle_animation" r="69.85699" cy="81" cx="81" stroke-width="8" stroke="#69aff4" fill="none"/>
     </g>
    </svg>
</div>

---

它是如何工作的？

stroke-dasharray 用于定义虚线使用的“模式”( MDN )。通过提供单个值，您可以创建一个 440 像素的破折号和 440 像素的空格的图案。 (440px 大致是圆的周长)。

stroke-dashoffset 有效地移动了破折号图案 (MDN) 的起点。

dash-offset 为 220(stroke-dasharray 的一半)会产生一个半圆。 110 = 四分之一圆等