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Re: gnuplot graphics toolkit bugs

From: Daniel J Sebald
Subject: Re: gnuplot graphics toolkit bugs
Date: Wed, 24 Jun 2015 23:01:12 -0500
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20111108 Fedora/3.1.16-1.fc14 Thunderbird/3.1.16

On 06/24/2015 10:11 PM, Tatsuro MATSUOKA wrote:
----- Original Message -----


However, I surprised when I found the description:
"* Mouse double-click to export terminal coordinates to the X11
clipboard no longer works reliably, and may be deprecated in the future."

I do not know reason why "Mouse double-click to export terminal coordinates
to the X11 clipboard no longer works" happened
but surprised that the statements "(it) may be deprecated in the future."
The developers selected not to fix the issue but to kill the feature.
The important feature will be lost from X11 terminal.

Yes, I hadn't seen that before either. I think there was frustration with getting X11 copy/paste to work with a clipboard manager, something I rarely use (where I use the usual X11 copy/paste types of things all the time). X11 is a little strange in that no data is requested of the copy source until the paste operation takes place. There is some handshaking to figure out what data format the destination accepts and the source provides--then the data is transferred. It's not easy to program.

As you know, configure in gnuplot 5, automatically enables qt terminal
if qt development environments are available.
In addition, qt terminal is selected as a default terminal without any
external setting like "export GNUTERM=wxt".
(On gnuplot 4, to enable qt, one should set option --with-qt at configure.)

This behavior can be understand from the description:


<snipped unrelated information>

  Configuration options for interactive use
        1. Qt The qt terminal supports interactive display with menu-driven 
output to png, svg or pdf. If either Qt4 or Qt5 is detected by the configure 
script, this will be the default terminal. It is now the fastest and most 
full-featured interactive terminal option.
To disable this terminal:
./configure --without-qt
To force use of Qt4 even if Qt5 is present:
./configure --with-qt=qt4
        2. Cairo/pango/wxWidgets This set of terminals includes
        * pngcairo, pdfcairo, epscairo, and cairolatex for output to a file
        * wxt for interactive display All of these will be built by default if 
the configuration script finds the required libcairo, libpango, libcairo, 
libwxgtk, and related support libraries To disable these terminals:
./configure --without-cairo ./configure --with-cairo --disable-wxt
        3. X11 (the "classic" interactive interface)
This used to be the preferred interactive interface, but the newer wxt and qt 
terminals offer nicer output and a wider range of features.
They clearly states that

All true...

   It is now the fastest and most full-featured interactive terminal option. 
(for qt)

except the speed. Perhaps there is some hardware in which Qt can use, say, OpenGL directly, but on my system that isn't the case. Qt terminal is drastically slower.

I am using gnuplot mainly on windows and sometimes use it on Ubuntu.
I select wxt terminal as a default terminal using startup file setting on both 
windows and Ubuntu.
Because it works both platforms. I do not select qt terminal because there 
sometimes reported bug fixes
for qt terminal in the ChangeLog of development branch (Now 5.1).

Actually, qt terminal did a leap frog on wxt as far as the features. But recently some more copy/past/print code was added to wxt so both behave in a very similar way.

  I some times provide windows binaries on gnuplot release. (e.g 4.6.6, 64 bit 
version of 5.0.0 and 5.0.1)
On window binaries for gnuplot ver. 5, qt terminal is available but not a 
The default terminal is wxt.

Yes, appreciate it, thanks.  Wxt is good.


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