Re: non scalable SVG ?

[sfeam <sf...@us...>]

On Wednesday, 25 March 2015 11:02:11 AM pl...@pi... wrote:
> Hi,
> 
> I came across this SVG on WikiPedia and tried to scale up but it would 
> not budge.
> 
> http://upload.wikimedia.org/wikipedia/commons/e/e5/Window_function_and_frequency_response_-_Cosine.svg
> 
> I had a look at the document source and found that it was created by 
> gnuplot 4.6 patch level 0.  That is ostensibly the same as I use on my 
> embedded system and it produces SVG that do scale perfectly.
> 
> I do notice that the group "gnuplot_canvas" on mine in inside a rect , 
> while thier non-scaling one it's the other way around, the rect is the 
> outermost element.
> 
> <!-- Tie mousing to entire bounding box of the plot -->
> <rect x="0" y="0" width="600" height="480" fill="#ffffff" stroke="black" 
> stroke-width="1"
> onclick="gnuplot_svg.toggleCoordBox(evt)" 
> onmousemove="gnuplot_svg.moveCoordBox(evt)"/>
> 
> <!-- Also track mouse when it is on a plot element -->
> <g id="gnuplot_canvas" onclick="gnuplot_svg.toggleCoordBox(evt)" 
> onmousemove="gnuplot_svg.moveCoordBox(evt)">
> 
> 
> 
> <g id="gnuplot_canvas">
> <rect x="0" y="0" width="576" height="288" fill="none"/>
> 
> 
> Now I can't understand why the WP graph is not scalable, indeed what is 
> the point of scalable vector graphic that will not scale.
> 
> Am I missing something?

When you select the svg terminal in gnuplot, you have the option of
adding a keyword "fixed" or "dynamic", as in 
    set term svg size 576, 288 fixed

The primary use for this that I know of is to control what happens
if you display the svg graph inside an HTML element that is itself
of a fixed size.  In one case a browser will typically show
only a window into the svg graph and will provide slider bars to move
the window; in the other case it will typically scale the graph
to fit in the HTML element.  Both cases are controlled by the 
browser and thus may vary across platforms, versions, and perhaps
the phase of the moon.  

This is particularly true if, as in the URL you gave, 
the svg plot is not embedded in an HTML element.
If you view that same svg plot via the Wikipedia page in which 
it is embedded
    http://en.wikipedia.org/wiki/Window_function
I think you will find that it does scale with the rest of the page.

IIRC this is also relevant to embedding svg elements inside
each other, but I don't have an example to give.

	Ethan