From 7c8ec4597b8cf07c98bcc095d3f1c53f33d0595d Mon Sep 17 00:00:00 2001
From: "Joachim Wuttke (laptop)" <j.wuttke@fz-juelich.de>
Date: Fri, 16 Sep 2011 07:57:28 +0200
Subject: [PATCH] improve comments
---
pub/src/dualplot.cpp | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/pub/src/dualplot.cpp b/pub/src/dualplot.cpp
index 7d074fd2..89f85f63 100644
--- a/pub/src/dualplot.cpp
+++ b/pub/src/dualplot.cpp
@@ -27,28 +27,31 @@ CPlot::CPlot( uint _iPlot, bool _logx, bool _logy ) :
iPlot( _iPlot ), X( _logx ), Y( _logy ),
maxpoints(20000), with_errors(true), equipoints(7), refine(true)
{
- // Start gnuplot. Use input redirection so that gnuplot receives
- // commands from a gp_fifo which is created here.
+ // == Initialization for Gnuplot ==
+ // Create a named pipe (FIFO) that will transmit our commands to Gnuplot.
string fn_fifo = string("/tmp/gnuplot-") + getenv( "LOGNAME" );
-
mystd::system( "rm -f "+fn_fifo );
if (mkfifo( fn_fifo.c_str(), 0666 ))
throw "SYSTEM ERROR cannot make fifo " + fn_fifo +
": will not be able to print";
+ // Start a Gnuplot that will read from our pipe.
mystd::system( "gnuplot -title " + strg(iPlot) + " -noraise" +
" < " + fn_fifo + " &" );
- // we use open instead of fopen or ofstream,
- // because we need non-blocking mode.
+ // Open our pipe so that we can write commands to it
+ // (we use 'open' instead of 'fopen' or 'ofstream',
+ // because we need non-blocking mode).
if ( ! ( gp_fifo = open( fn_fifo.c_str(), O_WRONLY ) ) )
throw "SYSTEM ERROR cannot open fifo " + fn_fifo +
": will not be able to print";
fcntl( gp_fifo, F_SETFL, O_NONBLOCK );
+ // Now the initialization _within_ Gnuplot.
gp_write( string("set terminal x11") );
+ // == Initialization for PostScript ==
ps_fnum=0;
}
--
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