[Plplot-cvs] SF.net SVN: plplot:[12141] trunk/examples/c/x21c.c

[<ai...@us...>]

Revision: 12141
          http://plplot.svn.sourceforge.net/plplot/?rev=12141&view=rev
Author:   airwin
Date:     2012-01-21 05:25:57 +0000 (Sat, 21 Jan 2012)
Log Message:
-----------
Move from 141 to 727 as the correct Hershey escape to use to represent
the multiplication sign for the default plfontld( 1 ) (i.e., the
"extended" Hershey fonts).  This fixes the previous issue with Hershey
drivers such as -dev xwin and -dev tk and still gives good results for
modern unicode font drivers such as svg, cairo, and qt.

Modified Paths:
--------------
    trunk/examples/c/x21c.c

Modified: trunk/examples/c/x21c.c
===================================================================
--- trunk/examples/c/x21c.c	2012-01-21 05:11:21 UTC (rev 12140)
+++ trunk/examples/c/x21c.c	2012-01-21 05:25:57 UTC (rev 12141)
@@ -208,10 +208,17 @@
     {
         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.
-        plstring( 1, &x[i], &y[i], "#(141)" );
+        // 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 );
 

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