gtk2_ardour/midi_scroomer.cc

   1 /*
   2     Copyright (C) 2008 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 #include "midi_scroomer.h"
  20
  21 #include <cairomm/context.h>
  22
  23 #include <iostream>
  24
  25 using namespace Gtkmm2ext;
  26 using namespace Gtk;
  27 using namespace std;
  28
  29 //std::map<int, Glib::RefPtr<Gdk::Pixmap> > MidiScroomer::piano_pixmaps;
  30
  31 MidiScroomer::MidiScroomer(Adjustment& adj)
  32         : Gtkmm2ext::Scroomer(adj)
  33 {
  34
  35         adj.set_lower(0);
  36         adj.set_upper(127);
  37
  38         /* set minimum view range to one octave */
  39         set_min_page_size(12);
  40 }
  41
  42 MidiScroomer::~MidiScroomer()
  43 {
  44 }
  45
  46 bool
  47 MidiScroomer::on_expose_event(GdkEventExpose* ev)
  48 {
  49         Cairo::RefPtr<Cairo::Context> cc = get_window()->create_cairo_context();
  50         GdkRectangle comp_rect, clip_rect;
  51         Component first_comp = point_in(ev->area.y);
  52         Component last_comp = point_in(ev->area.y + ev->area.height);
  53         int height = get_height();
  54         int lnote, hnote;
  55         double y2note = (double) 127 / height;
  56         double note2y = (double) height / 127;
  57         double note_width = 0.8 * get_width();
  58         double note_height = 1.4 * note2y;
  59         double black_shift = 0.1 * note2y;
  60         double colors[6] = {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f};
  61
  62         //cerr << ev->area.y << " " << ev->area.height << endl;
  63
  64         comp_rect.x = 0;
  65         comp_rect.width = get_width();
  66
  67         for (int i = first_comp; i <= last_comp; ++i) {
  68                 Component comp = (Component) i;
  69                 set_comp_rect(comp_rect, comp);
  70
  71                 if (gdk_rectangle_intersect(&comp_rect, &ev->area, &clip_rect)) {
  72                         get_colors(colors, comp);
  73
  74                         cc->rectangle(clip_rect.x, clip_rect.y, clip_rect.width, clip_rect.height);
  75                         cc->set_source_rgb (colors[3], colors[4], colors[5]);
  76                         cc->fill_preserve();
  77                         cc->clip();
  78
  79                         cc->set_source_rgb(colors[0], colors[1], colors[2]);
  80                         cc->set_line_width(note_height);
  81
  82                         lnote = 127 - (int) floor((double) (clip_rect.y + clip_rect.height) * y2note) - 1;
  83                         hnote = 127 - (int) floor((double) clip_rect.y * y2note) + 1;
  84
  85                         for (int note = lnote; note < hnote + 1; ++note) {
  86                                 double y = height - note * note2y;
  87                                 bool draw = false;
  88
  89                                 switch (note % 12) {
  90                                 case 1:
  91                                 case 6:
  92                                         y -= black_shift;
  93                                         draw = true;
  94                                         break;
  95                                 case 3:
  96                                 case 10:
  97                                         y += black_shift;
  98                                         draw = true;
  99                                         break;
 100                                 case 8:
 101                                         draw = true;
 102                                         break;
 103                                 default:
 104                                         break;
 105                                 }
 106
 107                                 if(draw) {
 108                                         cc->set_line_width(1.4 * note2y);
 109                                         cc->move_to(0, y);
 110                                         cc->line_to(note_width, y);
 111                                         cc->stroke();
 112                                 }
 113                         }
 114
 115                         if (i == Handle1 || i == Handle2) {
 116                                 cc->rectangle(comp_rect.x + 0.5f, comp_rect.y + 0.5f, comp_rect.width - 1.0f, comp_rect.height - 1.0f);
 117                                 cc->set_line_width(1.0f);
 118                                 cc->set_source_rgb (1.0f, 1.0f, 1.0f);
 119                                 cc->stroke();
 120                         }
 121
 122                         cc->reset_clip();
 123                 }
 124         }
 125
 126         return true;
 127 }
 128
 129 void
 130 MidiScroomer::get_colors(double color[], Component comp)
 131 {
 132         switch (comp) {
 133         case TopBase:
 134         case BottomBase:
 135                 color[0] = 0.24f;
 136                 color[1] = 0.24f;
 137                 color[2] = 0.24f;
 138                 color[3] = 0.33f;
 139                 color[4] = 0.33f;
 140                 color[5] = 0.33f;
 141                 break;
 142         case Handle1:
 143         case Handle2:
 144                 color[0] = 0.91f;
 145                 color[1] = 0.91f;
 146                 color[2] = 0.91f;
 147                 color[3] = 0.0f;
 148                 color[4] = 0.0f;
 149                 color[5] = 0.0f;
 150                 break;
 151         case Slider:
 152                 color[0] = 0.38f;
 153                 color[1] = 0.38f;
 154                 color[2] = 0.38f;
 155                 color[3] = 0.77f;
 156                 color[4] = 0.77f;
 157                 color[5] = 0.77f;
 158                 break;
 159         default:
 160                 break;
 161         }
 162 }
 163
 164 void
 165 MidiScroomer::on_size_request(Gtk::Requisition* r)
 166 {
 167         r->width = 12;
 168 }