SVG:基于文本的动态大小，合并对象 [英] SVG: dynamic size based on text, merging objects

问题描述

有没有办法在 SVG 中实现这样的目标?我的意思是有一个矩形和一个文本和:

a) 矩形的宽度和高度是动态的，因此当我更改文本时，矩形会调整其大小
b) 当我移动矩形时，文本随之移动

在中实现这样的东西会更容易吗?

<text id="text1" x="90" y="100" style="text-anchor:start;font-size:30px;">这是我的标题</text></defs><filter x="0" y="0" width="1" height="1" id="background"><feFlood flood-color="gray"/><feComposite in="SourceGraphic"/></过滤器><使用 xlink:href="#text1" fill="black" filter="url(#background)"/>

Erik Dahlström 提出了这样的建议.如何将填充放在背景中，如何添加例如.矩形的阴影或边框?而且，这在 IE9 中不起作用，所以我不能接受.如果 IE 支持 <foreignObject>，我就可以使用它.

我刚刚找到了我的问题 b) 的答案.您必须将两个元素放入组中:

<rect x="0" y="0" width="100" height="100" fill="red"></rect><text x="50" y="50" font-size="14" fill="blue" text-anchor="middle">你好</text>

然后你可以使用 transform 参数移动组:

似乎在每个浏览器中都能正常工作.

解决方案

可以使用 JavaScript 来调整框:

<svg xmlns="http://www.w3.org/2000/svg" onload="init()" height="100" 宽度="200"><style type="text/css">矩形{笔画:黑色；笔画宽度:1；填写:#ccc;}</风格><script type="text/javascript">var 文本，矩形无功填充 = 10函数初始化(){text = document.getElementsByTagName("text")[0]rect = document.getElementsByTagName("rect")[0]调整矩形()}函数调整矩形(){var bbox = text.getBBox()rect.setAttribute("x",bbox.x - 填充)rect.setAttribute("y",bbox.y - 填充)rect.setAttribute("width",bbox.width + 2*padding)rect.setAttribute("height",bbox.height + 2*padding)}<g><rect x="0" y="0" width="100" height="100" fill="red"></rect><text x="50" y="50" font-size="14" fill="blue" text-anchor="middle">你好</text></svg><div><button onclick="text.textContent='Goodbye';adjustRect()">更改文本</button>

<div style="float: left; padding: 10px; border: 1px solid; 
background: #ccc">random text</div>

Is there a way to achieve something like this in SVG? I mean to have a rectangle and a text and:

a) rectangle's width and height are dynamic, so when I change the text, the rectangle adjust its size
b) when I move the rectangle, the text goes with it

And would it be easier to achieve something like this in <canvas>?

EDIT:

<defs>       
    <text id="text1" x="90" y="100" style="text-anchor:start;font-size:30px;">
    THIS IS MY HEADER</text>
</defs>

<filter x="0" y="0" width="1" height="1" id="background">
    <feFlood flood-color="gray"/>
    <feComposite in="SourceGraphic"/>
</filter>

<use xlink:href="#text1" fill="black" filter="url(#background)"/>

Erik Dahlström proposed something like this. How to put padding to the background, how to add eg. shadow or border to the rectangle? And, this doesn't work in IE9, so I cannot accept it. I could just use <foreignObject> if there was a support for it in IE.

And I just figured out the answer for b) point of my question. You have to put both elements in the group:

<g>
    <rect x="0" y="0" width="100" height="100" fill="red"></rect>
    <text x="50" y="50" font-size="14" fill="blue" text-anchor="middle">Hello</text>
</g>

And then you can move the group using transform param:

<g transform="translate(x, y)">

Seems to work correct in every browser.

解决方案

You can use JavaScript to adjust the box:

<svg xmlns="http:/www.w3.org/2000/svg" onload="init()" height="100" width="200">
      <style type="text/css">
        rect {
          stroke:black;
          stroke-width:1;
          fill:#ccc;
        }
      </style>
      <script type="text/javascript">
        var text, rect
        var padding = 10
        function init() {
          text = document.getElementsByTagName("text")[0]
          rect = document.getElementsByTagName("rect")[0]
          adjustRect()
        }
        
        function adjustRect() {
          var bbox = text.getBBox()
          rect.setAttribute("x",bbox.x - padding)
          rect.setAttribute("y",bbox.y - padding )
          rect.setAttribute("width",bbox.width + 2*padding)
          rect.setAttribute("height",bbox.height + 2*padding)
        }
        
      </script>
      <g>
        <rect x="0" y="0" width="100" height="100" fill="red"></rect>
        <text x="50" y="50" font-size="14" fill="blue" text-anchor="middle">Hello</text>
      </g>
    </svg>
    <div>
      <button onclick="text.textContent='Goodbye';adjustRect()">change text</button>
    </div>

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