Using viewBox for unit conversion

[James Shaw]

I have been looking for a way to reflect an object about its y axis; I 
understand that I need a transform matrix to do this, and that you 
cannot translate by cms, ins or other units.  The ppl on #svg 
recommended using a viewbox.

I've checked on #svg, and I understand that a document like this:
<svg width="20cm" height="10cm" viewBox="0 0 200 100">
   <line x1="0" y1="0" x2="20" y2="10" style="stroke: blue; 
stroke-width: 1"/>
</svg>

should produce a drawing 20x10cms.  However, when I preview this in 
squiggle or a JSVGScrollPane, the drawing is about 80x40 pixels.  I 
would have expected batik to use the screen dpi (or similar measurement) 
to correct render the document at 100% zoom.

Am I using viewBox incorrectly, or am I using Batik wrongly?
Thanks in advance
James Shaw
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