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« Return to Thread: x11: slow drawing after set xtics font
Re: x11: slow drawing after set xtics font
by Petr Mikulik
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> '*' as a font name is a disadvantageous choice: the font selection
> mechanism of the x-server searches through all the fonts to find
> one which matches the name (there is a speed difference between
> specifying '*' and the name of a non existent font) and has the
> selected font size - in the normal x-server installation first the
> bitmapped fonts are searched then the scalable.
If the drawing gets so slow, it seems that the server searches the font list
for each tic for font "*", right? Cannot this be eliminated?
I think that Octave should produce gnuplot code like:
set terminal x11 font "arial"
set title "Hello world" font ",12"
instead of
set terminal x11
set title "Hello world" font "*,12"
> you can see this by specifying different font sizes: different
> fonts (sometimes even none) are selected.
>
> to make the plot fast select the name of a font which exists.
>
>
> Petr Mikulik wrote:
> >
> > Gnuplot x11 drawings in Octave 3.2 appear displayed much slower than it is
> > usual. This slow-down can be reproduced in gnuplot by e.g.:
> >
> >
> > set terminal x11 close
> > test
> >
> > set terminal x11 close
> > set title "Hello world" font "*,12" # no effect to speed
> > set xtics font "*,12" # makes slow drawing
> >
> > plot sin(x)/x
> >
> >
> > This slow-down is caused by
> > set xtics font "*,12"
> > while the font specification in "set title" does not slow gnuplot down.
> >
> > Note that using "set terminal wxt" does change its speed after the font
> > command.
> >
> > What can be the reason? Could the speed be improved?
> > The delay of replotting is rather boring when working with Octave on a
> > laptop running on battery :-(
> >
> > ---
> > PM
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> mechanism of the x-server searches through all the fonts to find
> one which matches the name (there is a speed difference between
> specifying '*' and the name of a non existent font) and has the
> selected font size - in the normal x-server installation first the
> bitmapped fonts are searched then the scalable.
If the drawing gets so slow, it seems that the server searches the font list
for each tic for font "*", right? Cannot this be eliminated?
I think that Octave should produce gnuplot code like:
set terminal x11 font "arial"
set title "Hello world" font ",12"
instead of
set terminal x11
set title "Hello world" font "*,12"
> you can see this by specifying different font sizes: different
> fonts (sometimes even none) are selected.
>
> to make the plot fast select the name of a font which exists.
>
>
> Petr Mikulik wrote:
> >
> > Gnuplot x11 drawings in Octave 3.2 appear displayed much slower than it is
> > usual. This slow-down can be reproduced in gnuplot by e.g.:
> >
> >
> > set terminal x11 close
> > test
> >
> > set terminal x11 close
> > set title "Hello world" font "*,12" # no effect to speed
> > set xtics font "*,12" # makes slow drawing
> >
> > plot sin(x)/x
> >
> >
> > This slow-down is caused by
> > set xtics font "*,12"
> > while the font specification in "set title" does not slow gnuplot down.
> >
> > Note that using "set terminal wxt" does change its speed after the font
> > command.
> >
> > What can be the reason? Could the speed be improved?
> > The delay of replotting is rather boring when working with Octave on a
> > laptop running on battery :-(
> >
> > ---
> > PM
------------------------------------------------------------------------------
Crystal Reports - New Free Runtime and 30 Day Trial
Check out the new simplified licensing option that enables unlimited
royalty-free distribution of the report engine for externally facing
server and web deployment.
http://p.sf.net/sfu/businessobjects
_______________________________________________
gnuplot-beta mailing list
gnuplot-beta@...
https://lists.sourceforge.net/lists/listinfo/gnuplot-beta
« Return to Thread: x11: slow drawing after set xtics font
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