Re: maximing/resizing multiple x11: change of palette

[Daniel J S. <dan...@ie...>]

Petr Mikulik wrote:
> This is an old bug (August 2004, see below). What do you think nowadays 
> about fixing it?

That bug is still in there?  I thought I had programmed that just as I had suggested below, i.e., a linked list of colormap.  (That is, don't duplicate colormaps for each plot unless it actually changes.)  Maybe that patch is still floating around somewhere.

I've really been set back by some computer things (got back from long break and now can't communicate IP address to/from ISP).  There are a number of gnuplot things I've been meaning to get to soon.

Dan


> 
> Petr
> 
> ***
> 
> There is a bug in the color palette treatment in the X11 terminal: when
> using multiple X11 terminals, window redraw (requested e.g. by a window
> manager) will change its palette.
> 
> Try this script:
> 
> 
> set pm3d map
> 
> set term x11 10
> set title '10 gray levels'
> set palette gray
> set palette maxcolors 10
> splot x*x
> 
> set term x11 2
> set title '2 colors'
> set palette color
> set palette maxcolors 2
> splot x
> 
> 
> Now, maximize or resize window #10 by mouse => it will change from gray map
> with 10 gray levels to color map with 2 colors.
> 
> 
> 
> 
>>> Yes, every x11 windows should have its own copy of the palette. When 
>>> there
>>> is a new (re)plot, x11 should copy the current gnuplot palette into 
>>> palette
>>> of the active window, and use that.
>>
>>
>> I don't like hacking stuff, and this may take some consideration.  I'm 
>> wondering how this should be structured, and whether we should be 
>> conservative with palette usage in order to not consume too much 
>> memory. Are palettes memory consumers?  If so, it might be wise to not 
>> save a color map with every plot.  That is, say there is a fairly 
>> large palette, and then someone creates twenty plots.  If all those 
>> plots have a similar palette, it may be an inefficient use of memory.
>>
>> Rather, it might be wise to have a linked-list of palettes.  Whenever 
>> a new palette is created, it is put in the linked list.  Then, when a 
>> palette is changed at the gnuplot command line, gplt_x11.c will search 
>> through the plot list and see if any of the plots is using the old 
>> palette.  If not, that color map can be discarded from the list.
>>
>> It sounds unnecessarily tedious, but it really does seem like the 
>> thing to do, and it actually might simplify the various uses of 
>> XAllocColor and XFreeColors.
> 
> 
> 
> -------------------------------------------------------
> SF.Net email is sponsored by:
> Tame your development challenges with Apache's Geronimo App Server. 
> Download
> it for free - -and be entered to win a 42" plasma tv or your very own
> Sony(tm)PSP.  Click here to play: http://sourceforge.net/geronimo.php
> _______________________________________________
> gnuplot-beta mailing list
> gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-beta
> 


-- 

Dan Sebald
phone: 608 256 7718
email: daniel DOT sebald AT ieee DOT org
URL: http://webpages DOT charter DOT net/dsebald/