Re: SVG Parsing

[Ian Redfern <Ian Redfern LogicaCMG com>]

It looks like you're looking at router.shape, one of the Cisco ones I converted from PostScript.

In Dia shapes, the absolute location and scale of the coordinate system don't matter, and you can pick any origin and multiplier. So for some A, B and C

svg.x = A + C*shape.x
svg.y = B + C*shape.y

The gsave/setmatrix are comments I left in to allow me to debug the results of the PostScript conversion - they now serve no purpose.

You can turn the shapes into pure SVG by removing everything but the <svg:path> tags and wrapping the whole thing in <svg xmlns:svg="http://www.w3.org/2000/svg">...</svg>

Ian Redfern.

On Mon, 2006-10-02 at 14:22 -0400, Jason Greenberg wrote:
> Hello,  I'm trying to parse the SVG/XML shape files in _javascript_, but
> before I can even do that, I need to understand what the file format is.
>
> Here's an example of a couple of lines that have been rendered in dia
> and exported to svg format (This works great in firefox):
>
>   <path style="fill: none; fill-opacity:0; stroke-width: 0.043; stroke:
> #aae6ff" d="M 15.5506 6.3581 L 15.5506,7.43852"/>
>   <path style="fill: none; fill-opacity:0; stroke-width: 0.043; stroke:
> #000000" d="M 19.9658 6.3581 L 19.9658,7.43852"/>
>
> This makes sense to me, and is fully usable.  The SVG .shape file format
> seems to be encoded in a way that I don't understand - here's the same
> paths from the shape file in its raw format:
>
>  <!--gsave-->
> <svg:path d="M1 1216L1 2949" style="stroke: #aae6ff; stroke-width: 0.43;
> fill: none"/>
> <!--gsave-->
> <svg:path d="M7083 1216L7083 2949" style="stroke: #000000; stroke-width:
> 0.43; fill: none"/>
> <!--gsave-->
> <!--setmatrix-->
>
> Questions:
> 1) How do the numerical values correspond?  (dividing doesn't seem to
> produce the same multiplier)
> 2) What are these gsave and setmatrix indicators all about?
>
> 3) Fingers crossed - does anyone know of a way that I could easily
> render these shape files in html using SVG?
>
> Thanks so much!
>
> Jay Greenberg
> CCIE #11021

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