Hello for the following code how do i change the colour of the value labeling 
of the bar charts (val_str in this case) ? Thanks!


//code from http://seriss.com/people/erco/fltk/#add_fd
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Chart.H>
#include <math.h>
// Demonstration of how to use Fl_Chart -- erco 11/20/08
int main() {
    Fl_Window *win = new Fl_Window(1000, 480);
    Fl_Chart  *chart = new Fl_Chart(20, 20, win->w()-40, win->h()-40, "Chart");
    chart->bounds(-125.0, 125.0);
    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->resizable(win);
    win->show();
    return(Fl::run());
}

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