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Function to create SVG "guage" graphics.

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First, here is some background info. I wanted to develop a script to 
generate graphical "guages" similar to those found at: 

https://google-
developers.appspot.com/chart/interactive/docs/gallery/gauge

I decided not to use the Google app itself because in the past they have 
dropped support for their apps. (Translate API a few years back, and 
Google chart API during the coming year.) Also, I really do not like the 
idea of using apps with no source or obfuscated source.

I did consider putting effort into improving one of the various public 
javascript "libraries", but I do not really like their generalistic 
approach. I just wanted a simple self-contained function with no external 
dependencies.

Thus, I have written my own guage function. You can see sample (SVG) 
outputs here:

http://pages.videotron.com/duffym/guagedemo.htm

It is not really intended as a demo of all capabilities. It is instead a 
tool to test the various execution paths within the function.


My questions are:

1) I do not feel good about using javacript object notation to define the 
argument list. (On the above page, you can see the source code for the 
argument object.) Is there a better way?

2) Is there anyone at all who is interested in using this? If so, I will 
make it easier to download, explicitly designate it as GPL, and perhaps 
add some internal comments.

3) Is there a need for further complicating the colors? Does anyone feel 
that it would be useful (for example), to say that you want 10 to 20 in 
red, 20 to 40 in red graduating to yellow, etc. ?

BTW, I have re-done my astronomy page to use SVG instead of the Google 
Chart API.

-- 
http://pages.videotron.ca/duffym/index.htm

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Function to create SVG "guage" graphics. Mike Duffy <Use_guestbook_page@website.in.sig> - 2012-07-22 02:55 +0000
  Re: Function to create SVG "guage" graphics. "Mel Smith" <med_cutout_syntel@aol.com> - 2012-07-21 22:23 -0600
  Re: Function to create SVG "guage" graphics. Dr J R Stockton <reply1230@merlyn.demon.co.uk.not.invalid> - 2012-07-23 19:34 +0100
    Re: Function to create SVG "guage" graphics. Mike Duffy <Use_guestbook_page@website.in.sig> - 2012-07-24 00:46 +0000
      Re: Function to create SVG "guage" graphics. Tim Slattery <Slattery_T@bls.gov> - 2012-07-24 08:50 -0400
        Re: Function to create SVG "guage" graphics. Mike Duffy <Use_guestbook_page@website.in.sig> - 2012-07-24 21:53 +0000
          Re: Function to create SVG "guage" graphics. Gene Wirchenko <genew@ocis.net> - 2012-07-24 16:40 -0700
          Re: Function to create SVG "guage" graphics. "Leonardo Azpurua" <leonardo@exmvps.org> - 2012-07-24 21:45 -0430
          Re: Function to create SVG "guage" graphics. Tim Slattery <Slattery_T@bls.gov> - 2012-07-25 09:08 -0400
      Re: Function to create SVG "guage" graphics. Dr J R Stockton <reply1230@merlyn.demon.co.uk.not.invalid> - 2012-07-25 19:25 +0100
  Re: Function to create SVG "guage" graphics. Dr J R Stockton <reply1230@merlyn.demon.co.uk.not.invalid> - 2012-07-26 19:30 +0100

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