This is (more or less) what I think Albrecht was suggesting you do:
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Chart.H>
#include <math.h>
static Fl_Double_Window *win;
static Fl_Chart *chart;
static void MyFun(Fl_Widget* w, void* u) {
w->redraw();
}
static void update_chart(void *) {
static int iter = 1;
static char c[10];
sprintf(c,"%i",iter);
chart->replace(iter, 100, c, 78);
iter++;
if(iter <= 30) {
Fl::repeat_timeout(0.5, update_chart);
}
}
int main() {
win = new Fl_Double_Window(1000, 480);
win->begin();
chart = new Fl_Chart(20, 20, win->w()-40, win->h()-40, "Chart");
chart->bounds(-125,125);
chart->callback(MyFun);
for ( double t=0; t<15; t+=0.5 ) {
double val = sin(t) * 125.0;
static char val_str[20];
sprintf(val_str, "%.0lf", val);
chart->add(val, val_str, (val<0)?FL_RED:FL_GREEN);
}
win->show();
Fl::add_timeout(0.5, update_chart);
return(Fl::run());
}
/* end of file */
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