Hi Mark,
just because I was curious I wrote a little program, which does some
easy calculation and plots 1000 graphs. On Windows (Pentium M 1733Mhz) I
achieved framerates from 280FPS (wxWidgets driver) to 530 FPS (wingcc)
driver (using -drvopt text=0 to disable antialized text). The xwin
driver might even be faster on Linux. Anyway, as long as you don't have
surface plots, I can't see any problems even for complicated lineplots.
So to answer your question - plplot performance should be good enough
for 5Hz plots.
HTH,
Werner
#include <time.h>
#include <math.h>
#include "plplot.h"
#define PC_e 1.60217653e-19 /* elementary charge e [C] */
#define PC_me 9.1093826e-31 /* mass of electron me [kg] */
#define NP 1001 /* number of points */
#define MAX(a, b) ((a)<(b)?(b):(a))
#define MIN(a, b) ((a)<(b)?(a):(b))
int main( int argc, char *argv[] )
{
PLFLT x[NP], y[NP];
PLFLT xmin, xmax;
PLFLT ymin=1e30, ymax=1e-30;
PLFLT r_c;
size_t i,counter;
clock_t watch;
float duration;
plparseopts( &argc, argv, PL_PARSE_FULL );
plinit();
plspause(0);
watch=clock();
for(counter=0; counter<1000; counter++) {
xmin=0.0001;
xmax=0.0020+counter/50.0;
r_c=0.02; /* maximum cyclotron radius */
for( i=0; i<NP; i++ ) {
x[i] = (xmax-xmin)*i/NP+xmin;
y[i] = (pow(x[i]*PC_e*r_c, 2.0)/2.0/PC_me)/PC_e;
ymin=MIN( ymin, y[i] );
ymax=MAX( ymax, y[i] );
}
plcol0( 1 );
plenv( xmin, xmax, ymin, ymax, 0, 0 );
plcol0( 2 );
pllab( "Magnetic field [T]", "Energy [eV]", "Energy Range");
plcol0( 3 );
plline( NP, x, y );
}
duration=(float)(clock()-watch)/CLOCKS_PER_SEC;
printf("%f sec, FPS %f\n", duration, 1000.0/duration );
/* Don't forget to call plend() to finish off! */
plend();
exit(0);
}
Mark Wilson wrote:
> Hello,
>
> We need to update a graph at about a 5Hz rate, and the
> plplot canvas doesn't seem able to keep up with that
> (takes 200 to 300 ms to update graph). I'm wondering if
> this is something to be expected, or if we're doing
> something wrong (I don't expect anyone to tell me what I
> may or may not be doing wrong, I'm just looking for
> general info on performance).
>
> Thanks,
> Mark
>
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--
Dipl. Ing. Werner Smekal
Institut fuer Allgemeine Physik
Technische Universitaet Wien
Wiedner Hauptstr 8-10
A-1040 Wien
Austria
email: [EMAIL PROTECTED]
web: http://www.iap.tuwien.ac.at/~smekal
phone: +43-(0)1-58801-13463 (office)
+43-(0)1-58801-13469 (laboratory)
fax: +43-(0)1-58801-13499
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