FLTK partition usage chart

fl_disk_usage_chart.cpp

#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Chart.H>
#include <FL/Fl_Box.H>
#include <charconv>
#include <ostream>
#include <sstream>
#include <iostream>
#include <string.h>
#include <sys/statvfs.h>
using namespace std; 

int main(int argc, char* argv[]) {
  Fl_Window* window = new Fl_Window(Fl::w()/2, Fl::h()-50, "Fast Light Disk Usage Analysis");
  struct statvfs stat;
  if (statvfs("/", &stat) != 0) {
    fprintf(stderr, "Error: Could not get disk space information.\n");
    return 1;
  }
//	Fl_Color darga = fl_rgb_color(41, 41, 41); 
	window->resizable(window);window->color(fl_rgb_color(41, 41, 41));window->position(Fl::w() / 2 - window->w() / 2, Fl::h() / 2 - window->h() / 2);
	unsigned long long total_space = stat.f_blocks * stat.f_frsize;
  unsigned long long free_space = stat.f_bfree * stat.f_frsize;
  unsigned long long used_space = total_space - free_space;

  // Create a line chart
	cout<<Fl::h()/2;
  Fl_Chart* chart = new Fl_Chart(0, 0,window->w(),window->h()/2);
  chart->type(FL_PIE_CHART);chart->autosize(1);chart->color(0);chart->box(FL_NO_BOX);chart->textcolor(FL_WHITE);
  double free_percentage = (double)free_space / total_space * 100;
  double used_percentage = 100 - free_percentage;
  std::stringstream ss;
  ss << free_percentage<<"%"<<" Free";
  std::string str = ss.str();
	ss.str("");
	ss << used_percentage<<"%"<<" Used";
  std::string str2 = ss.str();
  chart->add(free_percentage,str.c_str(),0);chart->add(used_percentage, str2.c_str(),FL_WHITE);
	double total_gb = static_cast<double>(total_space) / (1024 * 1024 * 1024);
	char disk_space_str[32]; 
//	snprintf(disk_space_str, sizeof(disk_space_str), "%.2f GB", total_gb); 
	Fl_Box* pstatics = new Fl_Box(0, window->h()/2, window->w(), 20,". . .");
//	pstatics->labelcolor();
	window->end();
  window->show();
  return Fl::run();
}