Re: [Plplot-general] Some notes on PLplot implementation and Ada binding

[Jerry <lan...@qw...>]

On Aug 16, 2006, at 4:07 PM, hba...@ma... wrote:

>
> On Aug 16, 2006, at 5:40 AM, Jerry wrote:
>> I have made an option to exchange Black and White in Color Map 0
>> (color 0 and color 15) because it is customary to work on a white
>> canvas on Macintosh. This works fine using the excellent AquaTerm
>> graphics terminal emulator on OS X. However, on X-windows (also
>> running on OS X), when black and white are switched, only the first
>> plot appears on a white background, and all others (in a particular
>> run) appear on a black background. However, the line color remains
>> switched, so that what were supposed to be black lines drawn on a
>> white background are instead (after the first plot) black lines drawn
>> on a black background, thus invisible.
>
> Did you setup the color table (with, for example, plscmap0n) prior to
> calling plinit()? Not all of the drivers support changing the color
> table "on the fly".

Thanks. Calling plscmap0 before plinit makes X-windows work as expected.
>
>> Another difference between running with AquaTerm and X-windows is
>> that AquaTerm plots all the plots of a particular run one after the
>> other in different windows, but X-windows (same binary) pauses after
>> each plot until Return is pressed, then re-draws the next plot in the
>> same window. There is a mention in the plplot.h about multiplot mode
>> with respect to plenv and plenv0--maybe that is relevant, but I
>> haven't been able to see any difference in behavior when using either
>> plenv or plenv0 on either windowing system.
>
> I believe that the difficulty here is that X-windows doesn't (at
> least easily) support "orphaned" windows. Since every window must
> have a running process associated with it, the X-windows driver was
> written to pause at plend()/pleop() so that the user would have a
> chance to see the graph before it was destroyed when the process
> ended, as would happen when you run one of the PLplot examples. This
> is also why all the plots are drawn in the same window.

Thanks--I'l stop worrying about it.
>
> -Hazen
>