[Plplot-devel] Commit of universal coordinate transform support - request for testing

[Hezekiah M. C. <hez...@us...>]

PLplot developers and interested users,

With PLplot trunk rev. 10905, I have committed basic support for
universal 2D coordinate transformations in PLplot using a new
function, plstransform.  The commit includes an additional page in
example 19 to illustrate how this function works.  A path
approximation function plpath has also been included which can be used
to draw an approximation of a straight line in transformed
coordinates.  An update to the API docbook documentation for these two
functions is included.

"Universal," in this case, refers to the fact that _all_ PLplot
plotting functions which act within the plot window should be affected
by the defined transform.  If no transform function is defined then
all PLplot functions should act as they did before this commit.  I
have attached an example plot which takes advantage of this function
both as an example of what this helps facilitate and to show that our
modern output devices (pngcairo in this case) produce some very nice
looking output!  The example shows plmap, plmeridians, plimagefr and
plcont all working with the same transformed coordinate system.

I have been using this patch for several months now without trouble or
regressions that I have seen.  This patch does, however, touch a large
number of core functions so I would like to request that other
developers keep an eye out for possible regressions.

The C and OCaml languages have been updated in this commit.

Take care,

Hez