gtk2_ardour/led.cc

   1 /*
   2     Copyright (C) 2010 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 <iostream>
  21 #include <cmath>
  22 #include <algorithm>
  23
  24 #include "led.h"
  25
  26 using namespace Gdk;
  27 using namespace Gtk;
  28 using namespace Glib;
  29
  30 LED::LED()
  31         : _visual_state (0)
  32         , _active (false)
  33         , _diameter (0.0)
  34         , _fixed_diameter (false)
  35         , _red (0.0)
  36         , _green (1.0)
  37         , _blue (0.0)
  38
  39 {
  40 }
  41
  42 LED::~LED()
  43 {
  44 }
  45
  46 void
  47 LED::render (cairo_t* cr)
  48 {
  49         if (!_fixed_diameter) {
  50                 _diameter = std::min (_width, _height);
  51         }
  52
  53         //background
  54
  55         Widget* parent;
  56         RefPtr<Style> style;
  57         Color c;
  58
  59         parent = get_parent ();
  60
  61         while (parent && !parent->get_has_window()) {
  62                 parent = parent->get_parent();
  63         }
  64
  65         if (parent && parent->get_has_window()) {
  66                 style = parent->get_style ();
  67                 c = style->get_bg (parent->get_state());
  68         } else {
  69                 style = get_style ();
  70                 c = style->get_bg (get_state());
  71         }
  72
  73
  74         cairo_rectangle(cr, 0, 0, _width, _height);
  75         cairo_stroke_preserve(cr);
  76         cairo_set_source_rgb(cr, c.get_red_p(), c.get_green_p(), c.get_blue_p());
  77         cairo_fill(cr);
  78
  79         cairo_translate(cr, _width/2, _height/2);
  80
  81 #if 0
  82         //inset
  83         cairo_pattern_t *pat = cairo_pattern_create_linear (0.0, 0.0, 0.0, _diameter);
  84         cairo_pattern_add_color_stop_rgba (pat, 0, 0,0,0, 0.4);
  85         cairo_pattern_add_color_stop_rgba (pat, 1, 1,1,1, 0.7);
  86         cairo_arc (cr, 0, 0, _diameter/2, 0, 2 * M_PI);
  87         cairo_set_source (cr, pat);
  88         cairo_fill (cr);
  89         cairo_pattern_destroy (pat);
  90
  91         //black ring
  92         cairo_set_source_rgb (cr, 0, 0, 0);
  93         cairo_arc (cr, 0, 0, _diameter/2-2, 0, 2 * M_PI);
  94         cairo_fill(cr);
  95
  96         //knob color
  97         cairo_set_source_rgba (cr, _red, _green, _blue, _active ? 0.8 : 0.2);
  98         cairo_arc (cr, 0, 0, _diameter/2-3, 0, 2 * M_PI);
  99         cairo_fill(cr);
 100
 101         //reflection
 102         cairo_scale(cr, 0.7, 0.7);
 103         cairo_pattern_t *pat2 = cairo_pattern_create_linear (0.0, 0.0, 0.0, _diameter/2-3);
 104         cairo_pattern_add_color_stop_rgba (pat2, 0, 1,1,1, _active ? 0.4 : 0.2);
 105         cairo_pattern_add_color_stop_rgba (pat2, 1, 1,1,1, 0.0);
 106         cairo_arc (cr, 0, 0, _diameter/2-3, 0, 2 * M_PI);
 107         cairo_set_source (cr, pat2);
 108         cairo_fill (cr);
 109         cairo_pattern_destroy (pat2);
 110 #endif
 111
 112         cairo_set_source_rgba (cr, _red, _green, _blue,  1.0);
 113         cairo_arc (cr, 0, 0, _diameter/2-5, 0, 2 * M_PI);
 114         cairo_fill(cr);
 115
 116         cairo_stroke (cr);
 117 }
 118
 119 void
 120 LED::set_visual_state (int32_t s)
 121 {
 122         if (s != _visual_state) {
 123
 124                 _visual_state = s;
 125                 set_colors_from_style ();
 126         }
 127 }
 128
 129 void
 130 LED::set_diameter (float d)
 131 {
 132         _diameter = (d*2) + 5.0;
 133
 134         if (_diameter != 0.0) {
 135                 _fixed_diameter = true;
 136         }
 137
 138         set_dirty ();
 139 }
 140
 141 void
 142 LED::on_realize ()
 143 {
 144         set_colors_from_style ();
 145         CairoWidget::on_realize ();
 146 }
 147
 148 void
 149 LED::on_size_request (Gtk::Requisition* req)
 150 {
 151         if (_fixed_diameter) {
 152                 req->width = _diameter;
 153                 req->height = _diameter;
 154         } else {
 155                 CairoWidget::on_size_request (req);
 156         }
 157 }
 158
 159 void
 160 LED::set_colors_from_style ()
 161 {
 162         RefPtr<Style> style = get_style();
 163         Color c;
 164
 165         switch (_visual_state) {
 166         case 0:
 167                 c = style->get_fg (STATE_NORMAL);
 168                 break;
 169         default:
 170                 c = style->get_fg (STATE_ACTIVE);
 171                 break;
 172         }
 173
 174         _red = c.get_red_p ();
 175         _green = c.get_green_p ();
 176         _blue = c.get_blue_p ();
 177
 178         set_dirty ();
 179 }