Colorbar_Window.cpp

// $Id: Colorbar_Window.cpp,v 1.36 2003-12-08 19:18:13 geuzaine Exp $
//
// Copyright (C) 1997-2003 C. Geuzaine, J.-F. Remacle
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; 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 to "gmsh@geuz.org".

// This class was inspired by the colorbar widget provided in Vis5d, a
// program for visualizing five dimensional gridded data sets
// Copyright (C) 1990 - 1995 Bill Hibbard, Brian Paul, Dave Santek,
// and Andre Battaiola.
   
#include "Gmsh.h"
#include "GmshUI.h"
#include "Numeric.h"
#include "GUI.h"
#include "ColorTable.h"
#include "Colorbar_Window.h"
#include "Context.h"

extern Context_T CTX;

#define UNDEFINED   0
#define EPS         1.e-10

#if (FL_MAJOR_VERSION == 1) && (FL_MINOR_VERSION == 0)
#define fl_contrast contrast
#endif

// This file defines the Colorbar_Window class (subclass of Fl_Window)

// The constructor

Colorbar_Window::Colorbar_Window(int x, int y, int w, int h, const char *l)
  : Fl_Window(x, y, w, h, l)
{
  ct = NULL;
  label = NULL;
  help_flag = 1;
  font_height = CTX.fontsize;
  marker_height = font_height;
  wedge_height = marker_height;
  marker_pos = 0;
  minval = maxval = 0.0;
}


// rgb on [0, 1], sv returned on [0, 1] and h on [0, 6]. 
// Exception: h is returned UNDEFINED if S==0.

#define RETURN_HSV(h,s,v) {*H=h; *S=s; *V=v; return;}

static void RGB_to_HSV(double R, double G, double B,
                       double *H, double *S, double *V)
{
  double v, x, f;