Set X and Y value for g element of SVG

问题

I am relatively new in SVG drawing with HTML5.

What I want to do is to make a group of elements in SVG with g element so that all elements inside of that g element can work like a group and all the element's base x and y value can be received from the upper g element.

So, what I have done is something like this-

<svg width="500" height="300" xmlns="http://www.w3.org/2000/svg">
  <g x="1000" y="1000">
    <title>SVG Title Demo example</title>
    <rect width="200" height="50"
    style="fill:wheat; stroke:blue; stroke-width:1px"/>
    <text style="text-anchor: middle;" class="small">My Text</text>
  </g>
</svg>

What I expected is all the elements inside the g element will get x="1000" and y="1000" so my expected output is like this-

But I am getting this-

Re-

I don't like to set x and y element in text element. I just want to set relative x and y into the text element if needed, but that should be relative to g element.

Can anyone help me what I need to do to achieve my target with a group in SVG?

回答1:

<g> elements don't support x or y attributes. You can use a transform instead though.

I've decreased the values from 1000 to 100 as otherwise the output is outside the 500 x 300 canvas of the outer <svg> element.

I've provided additional x and y attributes on the text element so it appears positioned as in your example. If wanted you could put the text itself in a <g> element or an <svg> element.

<svg width="500" height="300" xmlns="http://www.w3.org/2000/svg">
  <g transform="translate(100, 100)">
    <title>SVG Title Demo example</title>
    <rect width="200" height="50"
    style="fill:wheat; stroke:blue; stroke-width:1px"/>
    <text x="100" y="30" style="text-anchor: middle;" class="small">My Text</text>
  </g>
</svg>

or using an additional <g> element to avoid x and y on the text itself.

<svg width="500" height="300" xmlns="http://www.w3.org/2000/svg">
  <g transform="translate(100, 100)">
    <title>SVG Title Demo example</title>
    <rect width="200" height="50"
    style="fill:wheat; stroke:blue; stroke-width:1px"/>
    <g transform="translate(100, 30)">
        <text style="text-anchor: middle;" class="small">My Text</text>
    </g>
  </g>
</svg>

Alternatively you could use an inner <svg> element instead of a <g> element as that does support x and y attributes

<svg width="500" height="300" xmlns="http://www.w3.org/2000/svg">
  <svg x="100" y="100">
    <title>SVG Title Demo example</title>
    <rect width="200" height="50"
    style="fill:wheat; stroke:blue; stroke-width:1px"/>
    <text x="100" y="30" style="text-anchor: middle;" class="small">My Text</text>
  </svg>
</svg>

来源：https://stackoverflow.com/questions/50596319/set-x-and-y-value-for-g-element-of-svg

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