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         adj.set_lower(0);
  35         adj.set_upper(127);
  36
  37         /* set minimum view range to one octave */
  38         set_min_page_size(12);
  39 }
  40
  41 MidiScroomer::~MidiScroomer() {
  42 }
  43
  44 bool
  45 MidiScroomer::on_expose_event(GdkEventExpose* ev) {
  46         Cairo::RefPtr<Cairo::Context> cc = get_window()->create_cairo_context();
  47         GdkRectangle comp_rect, clip_rect;
  48         Component first_comp = point_in(ev->area.y);
  49         Component last_comp = point_in(ev->area.y + ev->area.height);
  50         int height = get_height();
  51         int lnote, hnote;
  52         double y2note = (double) 127 / height;
  53         double note2y = (double) height / 127;
  54         double note_width = 0.8 * get_width();
  55         double note_height = 1.4 * note2y;
  56         double black_shift = 0.1 * note2y;
  57         double colors[6];
  58
  59         //cerr << ev->area.y << " " << ev->area.height << endl;
  60
  61         comp_rect.x = 0;
  62         comp_rect.width = get_width();
  63
  64         for(int i = first_comp; i <= last_comp; ++i) {
  65                 Component comp = (Component) i;
  66                 set_comp_rect(comp_rect, comp);
  67
  68                 if(gdk_rectangle_intersect(&comp_rect, &ev->area, &clip_rect)) {
  69                         get_colors(colors, comp);
  70
  71                         cc->rectangle(clip_rect.x, clip_rect.y, clip_rect.width, clip_rect.height);
  72                         cc->set_source_rgb (colors[3], colors[4], colors[5]);
  73                         cc->fill_preserve();
  74
  75                         cc->clip();
  76                         cc->set_source_rgb(colors[0], colors[1], colors[2]);
  77                         cc->set_line_width(note_height);
  78
  79                         lnote = 127 - (int) floor((double) (clip_rect.y + clip_rect.height) * y2note) - 1;
  80                         hnote = 127 - (int) floor((double) clip_rect.y * y2note) + 1;
  81
  82                         for(int note = lnote; note < hnote + 1; ++note) {
  83                                 double y = height - note * note2y;
  84                                 bool draw = false;
  85
  86                                 switch(note % 12) {
  87                                 case 1:
  88                                 case 6:
  89                                         y -= black_shift;
  90                                         draw = true;
  91                                         break;
  92                                 case 3:
  93                                 case 10:
  94                                         y += black_shift;
  95                                         draw = true;
  96                                         break;
  97                                 case 8:
  98                                         draw = true;
  99                                         break;
 100                                 default:
 101                                         break;
 102                                 }
 103
 104                                 if(draw) {
 105                                         cc->set_line_width(1.4 * note2y);
 106                                         cc->move_to(0, y);
 107                                         cc->line_to(note_width, y);
 108                                         cc->stroke();
 109                                 }
 110                         }
 111
 112                         cc->reset_clip();
 113                 }
 114         }
 115
 116         return true;
 117 }
 118
 119 void
 120 MidiScroomer::get_colors(double color[], Component comp) {
 121         switch (comp) {
 122         case TopBase:
 123         case BottomBase:
 124                 color[0] = 0.24;
 125                 color[1] = 0.24;
 126                 color[2] = 0.24;
 127                 color[3] = 0.33;
 128                 color[4] = 0.33;
 129                 color[5] = 0.33;
 130                 break;
 131         case Handle1:
 132         case Handle2:
 133                 color[0] = 0.38;
 134                 color[1] = 0.38;
 135                 color[2] = 0.38;
 136                 color[3] = 0.91;
 137                 color[4] = 0.91;
 138                 color[5] = 0.91;
 139                 break;
 140         case Slider:
 141                 color[0] = 0.38;
 142                 color[1] = 0.38;
 143                 color[2] = 0.38;
 144                 color[3] = 0.77;
 145                 color[4] = 0.77;
 146                 color[5] = 0.77;
 147                 break;
 148         default:
 149                 break;
 150         }
 151 }
 152
 153 void
 154 MidiScroomer::on_size_request(Gtk::Requisition* r) {
 155         r->width = 16;
 156         r->height = 100;
 157         //r->width = 32;
 158         //r->height = 512;
 159 }
 160
 161 void
 162 MidiScroomer::on_size_allocate(Gtk::Allocation& a) {
 163         Scroomer::on_size_allocate(a);
 164 }