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Re: gnuplot graphics toolkit bugs

From: Daniel J Sebald
Subject: Re: gnuplot graphics toolkit bugs
Date: Wed, 24 Jun 2015 20:36:27 -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 07:45 PM, Tatsuro MATSUOKA wrote:
Probably this is a bad news for some unix platforms.

from KNOWN ISSUES for gnuplot 5.0

* Mouse double-click to export terminal coordinates to the X11 clipboard no 
longer works reliably, and may be deprecated in the future.

I'll look into this.

For gnuplot 5.0, x11 terminal is not a reliable one.
Now recommended terminal is the wxt or the qt terminal.

That's a premature statement, in my opinion. x11 terminal is reliable--fallen out of favor would be more like it. The reason that statement came about, I believe, is that wxt/qt have, let's say, more robust features for images and aliasing. This is true, but in some sense it is an apples/oranges comparison.

For example, qt terminal uses QPixmap


which is a feature of Qt to handle display of images. However, this is at a very high level in which image elements are treated individually, not as a whole image. Consequently, the user will find that the Qt terminal can be rather slow for large data sets. x11 is very low level, so is much faster. Yet, wxt is fast as well.

As I see it, gnuplot qt terminal is a good default for Octave as it has the same look and feel because it is Qt-based and is robust as far as platforms go. The data crunchers/viewers may want to switch to wxt. If wxt isn't available or has some quirk, x11 works nearly as well and is as fast.

One advantage of x11 is that it is low level and does not involve OpenGL. In other words, any bugs in the OpenGL driver--which could be specific to one's hardware setup--don't show up in gnuplot's x11 terminal.


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