Re: SVG Parsing

[Jason Greenberg <jay greenberg on ca>]

This is very helpful, thanks.

I guess I got confused because when i plugged these rendered values into
a spreadsheet, and divided the template values by the rendered values,
they produced only roughly the same number, not exactly.  Would the
exact scale be lost in render/export ?

Thanks again,

Jay

On Mon, 2006-10-02 at 22:37 +0100, Ian Redfern wrote:
> 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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