fltk/FL/Fl_Chart.H

//
// "$Id$"
//
// Forms chart header file for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2008 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems on the following page:
//
//     http://www.fltk.org/str.php
//

/** \file
   Fl_Chart widget . */

#ifndef Fl_Chart_H
#define Fl_Chart_H

#ifndef Fl_Widget_H
#include "Fl_Widget.H"
#endif

// values for type()
#define FL_BAR_CHART		0
#define FL_HORBAR_CHART		1
#define FL_LINE_CHART		2
#define FL_FILL_CHART		3
#define FL_SPIKE_CHART		4
#define FL_PIE_CHART		5
#define FL_SPECIALPIE_CHART	6

#define FL_FILLED_CHART  FL_FILL_CHART	// compatibility

#define FL_CHART_MAX		128
#define FL_CHART_LABEL_MAX	18

struct FL_CHART_ENTRY {
   float val;
   unsigned col;
   char str[FL_CHART_LABEL_MAX+1];
};

/**
  \class Fl_Chart
  \brief Fl_Chart displays simple charts.
  It is provided for Forms compatibility.

  \image html charts.gif

  \todo Refactor Fl_Chart::type() information.

  The type of an Fl_Chart object can be set using type(uchar t) to:
  \li \c FL_BAR_CHART: Each sample value is drawn as a vertical bar.
  \li \c FL_FILLED_CHART: The chart is filled from the bottom of the graph
         to the sample values.
  \li \c FL_HORBAR_CHART: Each sample value is drawn as a horizontal bar.
  \li \c FL_LINE_CHART: The chart is drawn as a polyline with vertices at
         each sample value.
  \li \c FL_PIE_CHART: A pie chart is drawn with each sample value being
         drawn as a proportionate slice in the circle.
  \li \c FL_SPECIALPIE_CHART: Like \c FL_PIE_CHART, but the first slice is
         separated from the pie.
  \li \c FL_SPIKE_CHART: Each sample value is drawn as a vertical line.
 */
class FL_EXPORT Fl_Chart : public Fl_Widget {
    int numb;
    int maxnumb;
    int sizenumb;
    FL_CHART_ENTRY *entries;
    double min,max;
    uchar autosize_;
    Fl_Font textfont_;
    Fl_Fontsize textsize_;
    unsigned textcolor_;
protected:
    void draw();
public:
    Fl_Chart(int X, int Y, int W, int H, const char *L = 0);

    ~Fl_Chart();

    void clear();

    void add(double val, const char *str = 0, unsigned col = 0);

    void insert(int ind, double val, const char *str = 0, unsigned col = 0);

    void replace(int ind, double val, const char *str = 0, unsigned col = 0);

    /**
      Gets the lower and upper bounds of the chart values.
      \param[out] a, b are set to lower, upper
     */
    void bounds(double *a,double *b) const {*a = min; *b = max;}

    void bounds(double a,double b);

    /**
      Returns the number of data values in the chart.
     */
    int size() const {return numb;}

    void size(int W, int H) { Fl_Widget::size(W, H); }

    /**
      Get the maximum number of data values for a chart.
     */
    int maxsize() const {return maxnumb;}

    void maxsize(int m);

    Fl_Font textfont() const {return textfont_;}
    void textfont(Fl_Font s) {textfont_ = s;}
    Fl_Fontsize textsize() const {return textsize_;}
    void textsize(Fl_Fontsize s) {textsize_ = s;}
    Fl_Color textcolor() const {return (Fl_Color)textcolor_;}
    void textcolor(unsigned n) {textcolor_ = n;}

    /**
      Get whether the chart will automatically adjust the bounds of the chart.
      \returns non-zero if auto-sizing is enabled and zero if disabled.
     */
    uchar autosize() const {return autosize_;}

    /**
      Set whether the chart will automatically adjust the bounds of the chart.
      \param n non-zero to enable automatic resizing, zero to disable.
     */
    void autosize(uchar n) {autosize_ = n;}
};

#endif

//
// End of "$Id$".
//