gtk2_ardour/axis_view.cc

   1 /*
   2     Copyright (C) 2003 Paul Davis
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 #include <cstdlib>
  21 #include <cmath>
  22
  23 #include <algorithm>
  24 #include <string>
  25
  26 #include <list>
  27
  28 #include <pbd/error.h>
  29
  30 #include <gtkmm2ext/utils.h>
  31 #include <gtkmm2ext/selector.h>
  32 #include <gtkmm2ext/gtk_ui.h>
  33
  34 #include <ardour/session.h>
  35 #include <ardour/utils.h>
  36
  37 #include "public_editor.h"
  38 #include "axis_view.h"
  39 #include "i18n.h"
  40
  41 using namespace Gtk;
  42 using namespace Gtkmm2ext;
  43
  44
  45 list<Gdk::Color> AxisView::used_colors;
  46
  47 AxisView::AxisView (ARDOUR::Session& sess) : _session(sess)
  48 {
  49         _selected = false;
  50         _marked_for_display = true;
  51         _old_order_key = 0;
  52 }
  53
  54 AxisView::~AxisView()
  55 {
  56
  57 }
  58
  59 Gdk::Color
  60 AxisView::unique_random_color()
  61 {
  62         Gdk::Color newcolor;
  63
  64         while (1) {
  65
  66                 /* avoid neon/glowing tones by limiting them to the
  67                    "inner section" (paler) of a color wheel/circle.
  68                 */
  69
  70                 const int32_t max_saturation = 48000; // 65535 would open up the whole color wheel
  71
  72                 newcolor.set_red (random() % max_saturation);
  73                 newcolor.set_blue (random() % max_saturation);
  74                 newcolor.set_green (random() % max_saturation);
  75
  76                 if (used_colors.size() == 0) {
  77                         used_colors.push_back (newcolor);
  78                         return newcolor;
  79                 }
  80
  81                 for (list<Gdk::Color>::iterator i = used_colors.begin(); i != used_colors.end(); ++i) {
  82                   Gdk::Color c = *i;
  83                         float rdelta, bdelta, gdelta;
  84
  85                         rdelta = newcolor.get_red() - c.get_red();
  86                         bdelta = newcolor.get_blue() - c.get_blue();
  87                         gdelta = newcolor.get_green() - c.get_green();
  88
  89                         if (sqrt (rdelta*rdelta + bdelta*bdelta + gdelta*gdelta) > 25.0) {
  90                                 used_colors.push_back (newcolor);
  91                                 return newcolor;
  92                         }
  93                 }
  94
  95                 /* XXX need throttle here to make sure we don't spin for ever */
  96         }
  97 }