使用 SVG 将文本居中

Question

Answer 1

将

text-anchor="middle"

添加到

text

元素。

笨蛋

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" style="shape-rendering:geometricPrecision; text-rendering:geometricPrecision; image-rendering:optimizeQuality; fill-rule:evenodd; clip-rule:evenodd"
viewBox="0 0 500 500">
  <g id="UrTavla">
    <circle style="fill:url(#toning);stroke:#010101;stroke-width:1.6871;stroke-miterlimit:10;" cx="250" cy="250" r="245">
    </circle>
    <text x="50%" y="50%" text-anchor="middle" stroke="#51c5cf" stroke-width="2px" dy=".3em">Look, I’m centered!Look, I’m centered!</text>
  </g>
</svg>

Answer 2

当您想绘制不以容器为中心的

circle

时，提出并接受的解决方案无效！

仅当 SVG 元素包含以视口为中心的圆时，在

x="50%"

标签上使用

y="50%"

text

才有效。

如果要绘制 3 个圆，还必须更改 (x,y) 文本坐标，使它们等于 (cx,cy) 圆坐标，如下例所示

正如

random

所提议的，我仅在代码片段中为第一个圆圈添加了

alignment-baseline="middle"

，因此您可以看到对于

Label

文本现在完全对齐（垂直）。

<svg height="350" width="350">
    <circle cx="110" cy="110" r="100"
            stroke="red"
            stroke-width="3"
            fill="none"
            />
    <text x="110" y="110" 
          text-anchor="middle"
          stroke="red"
          stroke-width="1px"
          alignment-baseline="middle"
          > Label
    </text>
    <circle cx="240" cy="110" r="100" 
            stroke="blue" 
            stroke-width="3"
            fill="none"
            />
    <text x="240" y="110" 
          text-anchor="middle" 
          stroke="blue" 
          stroke-width="1px"
          > Ticket
    </text>
    <circle cx="170" cy="240" r="100" 
            stroke="green" 
            stroke-width="3" 
            fill="none"
            />
    <text x="170" y="240" 
          text-anchor="middle" 
          stroke="green" 
          stroke-width="1px"
          > Vecto
    </text>
</svg>

只是为了好玩，我用 3 个圆圈来选择每个部分。只需点击它！

    function setReadableCode()
        {
        var circLabel = document.getElementById('circLabel');
        var circTicket = document.getElementById('circTicket');
        var circVecto = document.getElementById('circVecto');
        var interLabelTicket = document.getElementById('interLabelTicket');
        var interTicketVecto = document.getElementById('interTicketVecto');
        var interVectoLabel = document.getElementById('interVectoLabel');
        var interLabelTicketVecto = document.getElementById('interLabelTicketVecto');
        }

    function clickCircle(sCircle, sInter2a, sInter2b, sInter3)
        {
        var circ = document.getElementById(sCircle);
        var inter2a = document.getElementById(sInter2a);
        var inter2b = document.getElementById(sInter2b);
        var inter3 = document.getElementById(sInter3);

        var sColor = '';

        if (circ.style.fill == '' || circ.style.fill == 'white')
            {
            sColor = 'yellow';
            }
        else
            {
            sColor = 'white';
            }

        circ.style.fill = sColor;
        inter2a.style.fill = sColor;
        inter2b.style.fill = sColor;
        inter3.style.fill = sColor;

        setReadableCode();
        }

                    function clickCircLabel() {
                        clickCircle('circLabel', 'interLabelTicket', 'interVectoLabel', 'interLabelTicketVecto');
                    }

                    function clickCircTicket() {
                        clickCircle('circTicket', 'interLabelTicket', 'interTicketVecto', 'interLabelTicketVecto');
                    }

                    function clickCircVecto() {
                        clickCircle('circVecto', 'interVectoLabel', 'interTicketVecto', 'interLabelTicketVecto');
                    }

                    function clickIntersection2(sInter2, sInter3) {
                        var inter2 = document.getElementById(sInter2);
                        var inter3 = document.getElementById(sInter3);
                        var sColor = '';

                        if (inter2.style.fill == '' || inter2.style.fill == 'white') {
                            sColor = 'yellow';
                        }
                        else {
                            sColor = 'white';
                        }

                        inter2.style.fill = sColor;
                        inter3.style.fill = sColor;

                        setReadableCode();
                    }

                    function clickInterLabelTicket() {
                        clickIntersection2('interLabelTicket', 'interLabelTicketVecto');
                    }

                    function clickInterTicketVecto() {
                        clickIntersection2('interTicketVecto', 'interLabelTicketVecto');
                    }

                    function clickInterVectoLabel() {
                        clickIntersection2('interVectoLabel', 'interLabelTicketVecto');
                    }

                    function clickInterLabelTicketVecto() {
                        var inter = document.getElementById('interLabelTicketVecto');
                        var sColor = '';

                        if (inter.style.fill == '' || inter.style.fill == 'white') {
                            sColor = 'yellow';
                        }
                        else {
                            sColor = 'white';
                        }

                        inter.style.fill = sColor;
                        setReadableCode();
                    }

text 
    {
    font-family:Arial;
    }

<svg height="350" width="350">
<circle id="circLabel" cx="110" cy="110" r="100" stroke="red" stroke-width="0" fill="white" onclick="clickCircLabel();"/>
<text x="60" y="110" text-anchor="middle" stroke="red" stroke-width="1px" onclick="clickCircLabel();">Label</text>
<circle id="circTicket" cx="210" cy="110" r="100" stroke="blue" stroke-width="0" fill="yellow" onclick="clickCircTicket();"/>
<text x="260" y="110" text-anchor="middle" stroke="blue" stroke-width="1px" onclick="clickCircTicket();">Ticket</text>
<circle id="circVecto" cx="160" cy="196.602541" r="100" stroke="green" stroke-width="0" fill="white" onclick="clickCircVecto();" />
<text x="160" y="240" text-anchor="middle" stroke="green" stroke-width="1px" onclick="clickCircVecto();">Vecto</text>
<path id="interLabelTicket"
      d="M 160 23.397460 a100,100 0 0,0 0,173.205081 a100,100 0 0,0 0,-173.205081 z"
      fill="white"
      stroke-width="3"
      onclick="clickInterLabelTicket();"
      />

<path id="interVectoLabel"
      d="M 60 196.602541 a100,100 0 0,0 150,-86.602540 a100,100 0 0,0 -150,86.602540 z"
      fill="white"
      stroke-width="3"
      onclick="clickInterVectoLabel();"
      />

<path id="interTicketVecto"
      d="M 260 196.602541 a100,100 0 0,0 -150,-86.602540 a100,100 0 0,0 150,86.602540 z"
      fill="white"
      stroke-width="3"
      onclick="clickInterTicketVecto();"
      />

<path id="interLabelTicketVecto"
      d="M 110 110 a100,100 0 0,1 100,0 a100,100 0 0,1 -50,86.602540 a100,100 0 0,1 -50,-86.602540 z"
      fill="none"
      stroke-width="3"
      onclick="clickInterLabelTicketVecto();"
      />

<circle cx="110" cy="110" r="100" stroke="red" stroke-width="3" fill="none" />
<circle cx="210" cy="110" r="100" stroke="blue" stroke-width="3" fill="none" />
<circle cx="160" cy="196.602541" r="100" stroke="green" stroke-width="3" fill="none"/>

</svg>

Answer 3

也许，也可能有用

alignment-baseline="middle"

，与

text-anchor="middle"

：

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" style="shape-rendering:geometricPrecision; text-rendering:geometricPrecision; image-rendering:optimizeQuality; fill-rule:evenodd; clip-rule:evenodd" viewBox="0 0 500 500">

  <g id="UrTavla">
      <circle style="fill:url(#toning);stroke:#010101;stroke-width:1.6871;stroke-miterlimit:10;" cx="250" cy="250" r="245" /> <!--self-closing tag-->

      <text x="50%" y="50%" stroke="#51c5cf" stroke-width="2px" dy=".3em" text-anchor="middle" alignment-baseline="middle"> Look, I’m centered!Look, I’m centered! </text>
  </g>
</svg>

这里有一个很好的资源： http://apik.ca/prog_svg_text_style.html

Answer 4

适用于非中心圆圈的更简单的解决方案是将圆圈和文本放在翻译组中。

这样你就不需要在文本上重复坐标。

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>Centered texts</title>
  </head>

  <body ng-controller="MainCtrl">
    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 500 500">
      <g transform="translate(300, 300)" >
        <circle fill="none" stroke="black" stroke-width="1px" r="120"/>
        <text stroke="blue" stroke-width="1px" text-anchor="middle" alignment-baseline="central">Look, I’m centered!</text>
      </g>
      
      <g transform="translate(150, 150)" >
        <circle fill="none" stroke="black" stroke-width="1px" r="120"/>
        <text stroke="blue" stroke-width="1px" text-anchor="middle" alignment-baseline="central">Look, I’m also centered!</text>
      </g>
    </svg>
  </body>
</html>

Answer 5

使用

alignment-baseline="central"

的浏览器之间的行为不一致。值得注意的是，Chrome 会正确定位，但 Firefox 不会。如果您使用

dominant-baseline="central"

，它将在两者中正确显示。

火狐：

铬：

svg { height:140px }

<h4>alignment-baseline AND dominant-baseline settings:</h4>
<svg viewBox="0 0 48 48">
    <circle stroke="darkgray" stroke-width="1px" 
            fill="lightgray"  cx="50%" cy="50%" r="48%"/>
    <line x1="0" y1="50%" x2="100%" y2="50%" stroke="blue" stroke-width="1"/>
    <text text-anchor="middle" alignment-baseline="central" x="50%" y="50%">central</text> 
</svg>
<svg viewBox="0 0 48 48">
    <circle stroke="darkgray" stroke-width="1px" 
            fill="lightgray"  cx="50%" cy="50%" r="48%"/>
    <line x1="0" y1="50%" x2="100%" y2="50%" stroke="blue" stroke-width="1"/>
    <text text-anchor="middle" alignment-baseline="middle" x="50%" y="50%">middle</text> 
</svg>
<svg viewBox="0 0 48 48">
    <circle stroke="darkgray" stroke-width="1px" 
            fill="lightgray"  cx="50%" cy="50%" r="48%"/>
    <line x1="0" y1="50%" x2="100%" y2="50%" stroke="blue" stroke-width="1"/>
    <text text-anchor="middle" dominant-baseline="central" x="50%" y="50%">central</text> 
</svg>
<svg viewBox="0 0 48 48">
    <circle stroke="darkgray" stroke-width="1px" 
            fill="lightgray"  cx="50%" cy="50%" r="48%"/>
    <line x1="0" y1="50%" x2="100%" y2="50%" stroke="blue" stroke-width="1"/>
    <text text-anchor="middle" dominant-baseline="middle" x="50%" y="50%">middle</text> 
</svg>

Answer 6

在 SVG 圆圈中制作文本中心非常容易。

<svg height="300" width="300">
      <circle cx="120" cy="120" r="30%" fill="#117da9" />
      <text x="50" y="120" fill="white">Center Text in SVG Circle</text>
</svg>

您需要做的就是更改标签的 x 和 y 值，直到给定的文本与圆心对齐。例如，这里的 x 和 y 值是 x="50" y="120"

使用 SVG 将文本居中

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使用 SVG 将文本居中

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