Re: speed of qt terminal

[Tatsuro M. <tma...@ya...>]

----- Original Message -----
> From: Tatsuro MATSUOKA 
> To: tmacchant3 Daniel J Sebald 
> Cc: gnuplot-beta
> Date: 2015/6/27, Sat 14:43
> Subject: Re: speed of qt terminal
> 
> ----- Original Message -----
> 
>>  From: Tatsuro MATSUOKA 
>>  To: Daniel J Sebald 
>>  Cc: gnuplot-beta
>>  Date: 2015/6/27, Sat 13:04
>>  Subject: Re: speed of qt terminal
> 
>>  ----- Original Message -----
>>>   From: Daniel J Sebald
>>>   To: Tatsuro MATSUOKA
>>>   Cc: gnuplot-beta
>>>   Date: 2015/6/27, Sat 09:22
>>>   Subject: Re: speed of qt terminal
>>>>    Daniel.
>>>>    Can you show me a short script at which qt terminal is rather 
> slow?
>>>> 
>>>>    I would like to execute it on windows and ubuntu PC.
>>>> 
>>>>    Tatsuro
>>> 
>>>   Try something like:
>>> 
>>>     cd '<buildpath>/gnuplot/demo'
>>>     set term qt
>>>     splot 'blutux.rgb' binary array=(128,128) flipy 
>>>   format='%uchar' using 1:2:3 with rgbimage
>>> 
>>>     [rotate the image using a mouse]
>>> 
>>>     set term x11
>>>     replot
>>> 
>>>     [rotate the image using a mouse]
>>> 
>>>   If you want, exit, re-launch and try
>>> 
>>>     cd '<buildpath>/gnuplot/demo'
>>>     set term wxt
>>>     splot 'blutux.rgb' binary array=(128,128) flipy 
>>>   format='%uchar' using 1:2:3 with rgbimage
>>> 
>>>   On my system there is a very large difference in redraw speed with Qt. 
> 
>>  Granted, 
>>>   it could be the data transfer that is slow and rendering is fast, 
> don't 
>> 
>>>   know.  Also, on my system, the wxt terminal will show a bad aliasing 
> bug 
>>  when 
>>>   the image is rotated so that it is orthogonal to the window borders.
>>> 
>>>   Dan
>> 
>> 
>>  On windows
>> 
>> 
>>  Qt  very slow 
>>  wxt not slow not fast
>>  windows fastest
>> 
> 
> 
> I have tested gnuplot 5.1 built using msvc complier provided Kakuto.
> http://ctan.ijs.si/mirror/w32tex/w32/
> 
> 
> The difference in speed is small among three terminals.
> 
> My qt toolkit is built on MinGW-w64 4.9.2 (both 32 or 64 bit).
> 


The slowness of mouse operation on qt terminal with Dan's example occur 
when gnuplot for windows built against Qt-5.4.2.

Downgrade Qt version to 5.3.2, mouse operation on qt terminal with Dan's example
works without slowness.

It is better to seek the origin of slowness gnuplot for windows (Mingw) + qt 5.4.2.
However, I do not have knowledge and time to do so.

Tatsuro