[Kst] Kst 2.0

Matthew D Truch matt at truch.net
Fri Nov 13 20:54:43 CET 2009

And some more issues with a recent svn of kst2 (original issues repeated

PSDs are slow.  Really slow.  With live data (100Hz, 40000 samples), 4
psds plotted along with 4 xy plots makes kst unusably slow.  Everything
crawls to a standstill.  

Change Data Sample Ranges doesn't have an icon on the menu bar (that I
found); it was very convienient there.

Change data sample ranges doesn't seem to apply to psds.  Either that or
their update was so slow I never waited long enough for it to appear.

The data manager doesn't have a purge button.

New Equation (or new pretty much anything) is harder to find as they
seem to be only available through the data manager.  

Curves are rendered slightly above where they should be.  Take a plot
that it is of very boring data (like always exactly zero) and it'll be
drawn one pixel above the axis tick mark for zero.  

Text for labels and axes is rendered (anti-aliased) non-uniformly.  One
plot may look sharp whereas the plot immediately below it will have text
that looks blurry (even out of focus).  

> If you turn on data mode, the data mode indicator on the plot (grey
> filled circle) remains, even after you scroll your mouse to a new plot.
> If in "live" mode, the indicator will scroll with the plot until it
> disappears off the edge.  If you turn off datamode all shown indicators
> disappear, but if you turn it on, those ones reappear.  
> When in data mode, the position of the data mode indicator and the
> values in the bottom status bar only update if you move the mouse.  When
> live data is scrolling by and the mouse is still, the data mode
> indicator scrolls off the plot with the data (until you jiggle the
> mouse).
> When you plot 48 plots on one screen, the default text size for the
> plots is way too small to be readable.  
> In this case (48 plots, live data at 100Hz) kst2 is now usable (last
> time I tested it it was too bogged down to use).  However, it is still
> more sluggish than kst1 would feel with the same data on the same
> machine.  There are probably still some multiple draws or something.  
> With the live data, the UI is sluggish.  I have the plot update timer
> set to 200ms, but clearly the data only updates at about 2Hz (and it's
> kinda random), and between updates drawing things on the plots (like
> zoom rectangles) is choppy (updating when the data does).  The dialog
> boxes are also sluggish.  kst2 must not be multi-threaded.
> In zoom plot mode (hit 'z' when mouseover a plot) the text does not
> increase size as the plot expands.  This doesn't look proportioned
> correctly.  
> When looking at dirfile data, if the symlink changes, kst doesn't notice
> and one has to hit reload to get it to update.  This is annoying at
> best.

"One in every seven days is a Thursday."
Matthew Truch
Department of Physics and Astronomy
University of Pennsylvania
matt at truch.net
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