[Gnuplot-info] Plot one additional point, manually

[Allan F. <all...@ya...>]

Hi, I would like to plot a set of points which is being generated by a C
code, using pipe. It would plot a sequence of these points making a video.
Here is an example that does the job:

----------------------------------------------------------------

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main() {

    FILE *pipe;
    pipe = popen("gnuplot -persist", "w");

    fprintf(pipe, "set xlabel 'x (m)' \n");
    fprintf(pipe, "set ylabel 'y (m)' \n");
    fprintf(pipe, "set pointsize 1 \n");
    fprintf(pipe, "set xrange[-0.1:4.1] \n");
    fprintf(pipe, "set yrange[-0.1:4.1] \n");

    int i;
    double x, y;

    for (i = 1; i < 30; i++) {
        x = (double) rand() / RAND_MAX;
        y = (double) rand() / RAND_MAX;

        fprintf(pipe, "plot '< echo %lf, %lf' w p pt 7 lc -1 notitle \n",
4*x, 4*y);

        fflush(pipe);
        usleep(150000);
    }

    fclose(pipe);
    return 0;
}

-------------------------------------------------------------------------------------

It works ... however, the way it is done, it plots just one point at a time.
I would like to plot one point, then another one, but keeping the last point
... then another, keeping all the other 2 ... so I'd like to know how I
could add one point to a graph that is already done, that would solve my
problem.
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