On 2012-01-20 17:51-0800 Alan W. Irwin wrote:
> Andrew and I have recently been playing with examples/c/x21c.c, but I
> want to emphasize our changes are not yet ready for propagation to
> other languages because I discovered a plstring or device bug for -dev
> xwin and -dev tk that needs to be tracked down before we can finalize
> these changes.
OK. That bug (which turned out to be one introduced by me in the
example itself) has now been fixed (revision 12141).
Andrew's idea (which I really like) was to use the first page to show
the effect of plcol1 on text. I improved on that idea by adding
uniform cmap1 colours for the whole example. I also took this
opportunity to use the recommended plstring rather than deprecated
plpoin for generating the multiplication sign symbols to mark the
points for the first page. Both Andrew and I like the results
and feel these changes are ready to propagate to all the languages.
Here is the complete set of C changes for this example:
Index: examples/c/x21c.c
===================================================================
--- examples/c/x21c.c (revision 12095)
+++ examples/c/x21c.c (working copy)
@@ -180,6 +180,8 @@
plinit();
+ // Use a colour map with no black band in the middle.
+ cmap1_init();
// Initialise random number generator
plseed( 5489 );
@@ -198,13 +200,26 @@
plAlloc2dGrid( &zg, xp, yp ); // the output grided data
clev = (PLFLT *) malloc( (size_t) nl * sizeof ( PLFLT ) );
- // printf("Npts=%d gridx=%d gridy=%d", pts, xp, yp);
plcol0( 1 );
plenv( xm, xM, ym, yM, 2, 0 );
plcol0( 15 );
pllab( "X", "Y", "The original data sampling" );
- plcol0( 2 );
- plpoin( pts, x, y, 5 );
+ for ( i = 0; i < pts; i++ )
+ {
+ plcol1( ( z[i] - zmin ) / ( zmax - zmin ) );
+ // The following plstring call should be the the equivalent of
+ // plpoin( 1, &x[i], &y[i], 5 ); Use plstring because it is
+ // not deprecated like plpoin and has much more powerful
+ // capabilities. N.B. symbol 141 works for Hershey devices
+ // (e.g., -dev xwin) only if plfontld( 0 ) has been called
+ // while symbol 727 works only if plfontld( 1 ) has been
+ // called. The latter is the default which is why we use 727
+ // here to represent a centred X (multiplication) symbol.
+ // This dependence on plfontld is one of the limitations of
+ // the Hershey escapes for PLplot, but the upside is you get
+ // reasonable results for both Hershey and Unicode devices.
+ plstring( 1, &x[i], &y[i], "#(727)" );
+ }
pladv( 0 );
plssub( 3, 2 );
Please propagate these changes in example 21 to all your favorite languages.
Alan
__________________________
Alan W. Irwin
Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).
Programming affiliations with the FreeEOS equation-of-state
implementation for stellar interiors (freeeos.sf.net); the Time
Ephemerides project (timeephem.sf.net); PLplot scientific plotting
software package (plplot.sf.net); the libLASi project
(unifont.org/lasi); the Loads of Linux Links project (loll.sf.net);
and the Linux Brochure Project (lbproject.sf.net).
__________________________
Linux-powered Science
__________________________
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