On Tue, Oct 30, 2012 at 03:40:32PM -0700, Alan Irwin wrote:
> Careful comparison (e.g., by aligning the pages on top of each other
> and blinking between the two every second or so by alternatively
> iconifying and deiconifying the one on top) of pages 3 and 4 of the
> 19th standard example shows there are some subtle visual differences beyond
> the obvious "Baltimore" label on the 4th page.  In particular,
> the dashed lines of latitude are rendered slightly differently in the
> lower right quadrant of the plot.  (I have verified this issue with the
> xcairo, pscairo, qtwidget, epsqt, and xwin devices so I don't think it
> is a driver issue.)
> 
> With regard to the lines of latitude, the only difference between the
> two pages is plstransform is being used for page 4 but not for page 3.
> If you use diff or ndiff between the two pages rendered as PostScript
> (using the -fam option so you can generate a separate file per page),
> there are lots of relatively big differences (which presumably I
> spotted visually) and also many intermediate and small differences as
> well.
> 
> If plstransform is doing its job properly, shouldn't the two pages be
> absolutely identical except for the Baltimore label?

Alan,

You are right that setting the map transform for plmap should be
identical to setting the global transform here. 

One obvious question - have you tried with a version before the recent
plmap changes to make sure it isn't a new bug we've introduced?

Andrew

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