//

// Demonstrate how to use Fl_Chart in fltk

//

// Demonstrates rudimentary features of Fl_Chart.

// Origin: http://seriss.com/people/erco/fltk/#Fl_Chart

//

// Copyright 2008 by Greg Ercolano.

// Copyright 1998-2023 by Bill Spitzak and others.

//

// This library is free software. Distribution and use rights are outlined in

// the file "COPYING" which should have been included with this file. If this

// file is missing or damaged, see the license at:

//

// https://www.fltk.org/COPYING.php

//

// Please see the following page on how to report bugs and issues:

//

// https://www.fltk.org/bugs.php

//

#include <FL/Fl.H>

#include <FL/Fl_Window.H>

#include <FL/Fl_Chart.H>

#include <FL/Fl_Choice.H>

#include <math.h>

// Globals

Fl_Window *G_win = 0;

Fl_Chart *G_chart = 0;

Fl_Choice *G_choice = 0;

// Fl_Choice callback for changing chart type()

static void chart_type_cb(Fl_Widget *w, void*) {

const Fl_Menu_Item *item = G_choice->mvalue(); // item picked

G_chart->type( (uchar)item->argument() ); // apply change

G_chart->redraw();

// printf("Choice: '%s', argument=%ld\n", G_choice->text(), item->argument());

}

// main

int main() {

G_win = new Fl_Window(1000, 510, "Chart Simple");

// Fl_Chart with a sin() wave of data

G_chart = new Fl_Chart(20, 20, G_win->w()-40, G_win->h()-80, "Chart");

G_chart->bounds(-125.0, 125.0);

const double start = 1.5;

const double end = start + 15.1;

for (double t = start; t < end; t += 0.5) {

double val = sin(t) * 125.0;

static char val_str[20];

sprintf(val_str, "%.0lf", val);

G_chart->add(val, val_str, (val<0)?FL_RED:FL_GREEN);

}

// Let user change chart type

G_choice = new Fl_Choice(140,470,200,25,"Chart Type: ");

G_choice->add("FL_BAR_CHART", 0, chart_type_cb, (void*)FL_BAR_CHART );

G_choice->add("FL_HORBAR_CHART", 0, chart_type_cb, (void*)FL_HORBAR_CHART);

G_choice->add("FL_LINE_CHART", 0, chart_type_cb, (void*)FL_LINE_CHART);

G_choice->add("FL_FILL_CHART", 0, chart_type_cb, (void*)FL_FILL_CHART);

G_choice->add("FL_SPIKE_CHART", 0, chart_type_cb, (void*)FL_SPIKE_CHART);

G_choice->add("FL_PIE_CHART", 0, chart_type_cb, (void*)FL_PIE_CHART);

G_choice->add("FL_SPECIALPIE_CHART", 0, chart_type_cb, (void*)FL_SPECIALPIE_CHART);

G_choice->value(0);

G_win->resizable(G_win);

G_win->show();

return(Fl::run());

}