Scale and center any svg element full-viewport-CodePudding

My appologies for being the nth person to ask this question. I've snooped around a bunch and haven't cracked it yet.

I would like to be able to scale "any" svg to the full size of the viewport, centered.

For example, consider the following svg element:

    <svg baseProfile="full" height="100%" version="1.1" width="100%"
     xmlns="http://www.w3.org/2000/svg"
     xmlns:ev="http://www.w3.org/2001/xml-events"
     xmlns:xlink="http://www.w3.org/1999/xlink"><defs />
      <polygon fill="blue" points="0,0 10,0 10,10 0,10" />
    </svg>

I would just like to center and up-scale that until it fills the entire browser's viewport. The end result should be a big blue square. Since most displays are wider than they are high, it should be centered and vertically filling the browser...you know, like 9 inches, not 2mm ;-)

Ideally I'd like to also be able to have negative coordinates and have all that "just handled" (eg: center! maximize! thnx!)

I've tried a combination of CSS techniques. None of the method's I've "googled" seem to work.

I feel like the "points" are pixels and therefore "full screen" still means 10x10 pixels. Maybe that's the wrong interpretation.

An aside that may or may not matter: I'm using the Python svgwrite package, which has its own set of ways to scale, translate, rotate... But none of these seem to work for me either.

CodePudding user response：

You have to add a viewBox or you won't be able to scale it.

Including an ‘svg’ element inside SVG content creates a new SVG viewport into which all contained graphics are drawn; this implicitly establishes both a new viewport coordinate system and a new user coordinate system. Additionally, there is a new meaning for percentage units therein, because a new SVG viewport has been established.

https://www.w3.org/TR/SVG2/coords.html#EstablishingANewSVGViewport

svg {
  position: absolute;
  width: 100%;
  height: 100%;
}

<svg baseProfile="full" version="1.1" viewBox="0 0 10 10"
     xmlns="http://www.w3.org/2000/svg"
     xmlns:ev="http://www.w3.org/2001/xml-events"
     xmlns:xlink="http://www.w3.org/1999/xlink"><defs />
      <polygon fill="blue" points="0,0 10,0 10,10 0,10" />
    </svg>