plplot-general

[Plplot-general] color allocation error

[Aldric L'Hernault<Aldric.L'<Her...@mo...>]

Hi,

 First I have to thanks you guys for this library. I finally
 managed to compile it on HP, Solaris and Linux.

 I am using tcl binding with "plframe" widget, then use the
 "plbop" subcommand.
 After creating aa few wigdets (around 15) it sometime reaches a
 maximum number of color and the whole program stops with a message
 similar to this one:

 *** PLPLOT ERROR ***
 cannot allocate any color

 I wouldn't consider this dramatic except it crash the wish
 interpreter also. Is there a way to decreases color allocation, or
 at least to trap the error before ?

 thanks,

Aldric

Re: [Plplot-general] color allocation error

[Maurice L. <mj...@ga...>]

Aldric L'Hernault writes:
 > Hi,
 > 
 >  First I have to thanks you guys for this library. I finally
 >  managed to compile it on HP, Solaris and Linux.
 > 
 >  I am using tcl binding with "plframe" widget, then use the
 >  "plbop" subcommand.
 >  After creating aa few wigdets (around 15) it sometime reaches a
 >  maximum number of color and the whole program stops with a message
 >  similar to this one:
 > 
 >  *** PLPLOT ERROR ***
 >  cannot allocate any color
 > 
 >  I wouldn't consider this dramatic except it crash the wish
 >  interpreter also. Is there a way to decreases color allocation, or
 >  at least to trap the error before ?

I agree this should be handled better.  Right now there are many bail-out
scenarios in the X driver that the plframe TK widget should probably trap.
No simple solution however.

You can reduce the number in cmap0 or cmap1 through the plscmap0n() and
plscmap1n() API calls, respectively.  Unfortunately there isn't currently
a plframe widget option that achieves this effect.

On my Linux system using a 16-bit color depth X session, I don't see this
error.  Using the 'tk03' demo program I created 30 child windows (containing
plframe widgets) without problem before quitting.

-- 
Maurice LeBrun
Lightspeed Semiconductor Corp

Re: [Plplot-general] color allocation error

[Aldric L'Hernault<Aldric.L'<Her...@mo...>]

Maurice LeBrun wrote (speaking about tk interpreter crashing with
"cannot allocate any color" error)
> You can reduce the number in cmap0 or cmap1 through the plscmap0n() and
> plscmap1n() API calls, respectively.  Unfortunately there isn't currently
> a plframe widget option that achieves this effect.
> 
> On my Linux system using a 16-bit color depth X session, I don't see this
> error.  Using the 'tk03' demo program I created 30 child windows (containing
> plframe widgets) without problem before quitting.
> 

Maurice,

Thanks for the tip, I'll try it. Anyway I am unsure of the result, since
we are using an application that requires us to run 8-bit depth X
sessions (not to name it: Cadence dfII ;-)

As soon as I have a bit of time, I try also to have a look into plframe
code.

The probleme occurs here on Solaris, HP-UX and Linux, around the 50th
plframe widget drawn (more or less depending on other applications'
color scheme)

Thanks again,

 Aldric