2 Copyright (C) 2002-2007 Paul Davis
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.
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.
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.
20 #include "pbd/compose.h"
22 #include "canvas/canvas.h"
23 #include "canvas/debug.h"
25 #include "tempo_lines.h"
26 #include "public_editor.h"
27 #include "rgb_macros.h"
28 #include "ui_config.h"
32 TempoLines::TempoLines (ArdourCanvas::Container* group, double)
33 : lines (group, ArdourCanvas::LineSet::Vertical)
35 lines.set_extent (ArdourCanvas::COORD_MAX);
39 TempoLines::tempo_map_changed()
57 TempoLines::draw_ticks (const ARDOUR::TempoMap::BBTPointList::const_iterator& b,
59 framecnt_t leftmost_frame,
60 framecnt_t frame_rate)
62 const double fpb = b->tempo->frames_per_beat(frame_rate);
63 const uint32_t base = UIConfiguration::instance().color_mod("measure line beat", "measure line beat");
65 for (unsigned l = 1; l < divisions; ++l) {
66 /* find the coarsest division level this tick falls on */
67 unsigned level = divisions;
68 for (unsigned d = divisions; d >= 4; d /= 2) {
69 if (l % (divisions / d) == 0) {
74 /* draw line with alpha corresponding to coarsest level */
75 const uint8_t a = max(8, (int)rint(UINT_RGBA_A(base) / (0.8 * log2(level))));
76 const uint32_t c = UINT_RGBA_CHANGE_A(base, a);
77 const framepos_t f = b->frame + (l * (fpb / (double)divisions));
78 if (f > leftmost_frame) {
79 lines.add (PublicEditor::instance().sample_to_pixel_unrounded (f), 1.0, c);
85 TempoLines::draw (const ARDOUR::TempoMap::BBTPointList::const_iterator& begin,
86 const ARDOUR::TempoMap::BBTPointList::const_iterator& end,
88 framecnt_t leftmost_frame,
89 framecnt_t frame_rate)
91 ARDOUR::TempoMap::BBTPointList::const_iterator i;
98 /* get the first bar spacing */
102 bars = (*i).bar - (*begin).bar;
103 beats = distance (begin, end) - bars;
105 beat_density = (beats * 10.0f) / lines.canvas()->width();
107 if (beat_density > 2.0f) {
108 /* if the lines are too close together, they become useless */
113 /* constrain divisions to a log2 factor to cap line density */
114 while (divisions > 3 && beat_density * divisions > 0.4) {
120 if (beat_density <= 0.12 && begin != end && begin->frame > 0) {
121 /* draw subdivisions of the beat before the first visible beat line */
122 ARDOUR::TempoMap::BBTPointList::const_iterator prev = begin;
124 draw_ticks(prev, divisions, leftmost_frame, frame_rate);
127 for (i = begin; i != end; ++i) {
130 color = UIConfiguration::instance().color ("measure line bar");
132 if (beat_density > 0.3) {
133 continue; /* only draw beat lines if the gaps between beats are large. */
135 color = UIConfiguration::instance().color_mod ("measure line beat", "measure line beat");
138 ArdourCanvas::Coord xpos = PublicEditor::instance().sample_to_pixel_unrounded ((*i).frame);
140 lines.add (xpos, 1.0, color);
142 if (beat_density <= 0.12) {
143 /* draw subdivisions of this beat */
144 draw_ticks(i, divisions, leftmost_frame, frame_rate);