Thank you all :) With your feedback I have been able to get my application
working quite well!
--Chad
On 9/18/07, Maurice LeBrun <[EMAIL PROTECTED]> wrote:
>
> Charles Parker writes:
> > Hello plplot community :^)
> >
> > I have two questions w/ regards to the functionality of the plplot C++
> > bindings.
> >
> > First, is it possible to plot single pixels in scatter plot (plpoin)?
> I've
> > tried using a lot of the different symbols and changing the size of
> those
> > symbols (with plssym), but I can't seem to find a combination that will
> just
> > turn on a single pixel for each data point I plot.
>
> There is a trick that works fine for the xwin driver. But the "points"
> vanish
> for e.g. the ps driver, so YMMV. From plysm.c --
>
>
> /*--------------------------------------------------------------------------*\
> * void plpoin()
> *
> * Plots array y against x for n points using ASCII code "code".
> *
> * code=-1 means try to just draw a point. Right now it's just a move and
> * a draw at the same place. Not ideal, since a sufficiently intelligent
> * output device may optimize it away, or there may be faster ways of
> * doing it. This is OK for now, though, and offers a 4X speedup over
> * drawing a Hershey font "point" (which is actually diamond shaped and
> * therefore takes 4 strokes to draw).
>
> \*--------------------------------------------------------------------------*/
>
> void
> c_plpoin(PLINT n, PLFLT *x, PLFLT *y, PLINT code)
>
> > Second, I'm going to be plotting about 5000 data points or so, the
> problem
> > is that the way my data are structured, the points I need to plot are
> not
> > stored sequentially in memory. I have data with about 15 parameters per
> > point, and I only want to plot points (the x and y are two of the
> > parameters) that satisfy some filtering criteria. Am I better off simply
> > taking the memory and performance hit to create an additional data
> structure
> > in which these data are sequential? Or can I simply call plpoin to plot
> each
> > individual point? In the latter case I would loop through the data only
> once
> > and plot points as I found them, whereas in the former there is the
> extra
> > overhead of creating the data structure and copying the data before I
> can
> > plot it.
>
> Calling plpoin for each point separately should be fine.
>
> --
> Maurice LeBrun
>
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