David Robillard
0a5d5f91c9
This fixes two zoom levels (the closest that shows bars, and the next closest) that had the same tick resolution despite enough space.
149 lines
4.2 KiB
C++
149 lines
4.2 KiB
C++
/*
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Copyright (C) 2002-2007 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "pbd/compose.h"
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#include "canvas/canvas.h"
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#include "canvas/debug.h"
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#include "ardour_ui.h"
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#include "public_editor.h"
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#include "rgb_macros.h"
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#include "tempo_lines.h"
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using namespace std;
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TempoLines::TempoLines (ArdourCanvas::Container* group, double)
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: lines (group, ArdourCanvas::LineSet::Vertical)
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{
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lines.set_extent (ArdourCanvas::COORD_MAX);
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}
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void
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TempoLines::tempo_map_changed()
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{
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lines.clear ();
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}
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void
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TempoLines::show ()
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{
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lines.show ();
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}
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void
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TempoLines::hide ()
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{
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lines.hide ();
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}
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void
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TempoLines::draw_ticks (const ARDOUR::TempoMap::BBTPointList::const_iterator& b,
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unsigned divisions,
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framecnt_t leftmost_frame,
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framecnt_t frame_rate)
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{
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const double fpb = b->tempo->frames_per_beat(frame_rate);
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const uint32_t base = ARDOUR_UI::config()->color_mod("measure line beat", "measure line beat");
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for (unsigned l = 1; l < divisions; ++l) {
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/* find the coarsest division level this tick falls on */
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unsigned level = divisions;
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for (unsigned d = divisions; d >= 4; d /= 2) {
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if (l % (divisions / d) == 0) {
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level = d;
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}
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}
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/* draw line with alpha corresponding to coarsest level */
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const uint8_t a = max(8, (int)rint(UINT_RGBA_A(base) / (0.8 * log2(level))));
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const uint32_t c = UINT_RGBA_CHANGE_A(base, a);
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const framepos_t f = b->frame + (l * (fpb / (double)divisions));
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if (f > leftmost_frame) {
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lines.add (PublicEditor::instance().sample_to_pixel_unrounded (f), 1.0, c);
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}
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}
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}
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void
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TempoLines::draw (const ARDOUR::TempoMap::BBTPointList::const_iterator& begin,
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const ARDOUR::TempoMap::BBTPointList::const_iterator& end,
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unsigned divisions,
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framecnt_t leftmost_frame,
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framecnt_t frame_rate)
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{
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ARDOUR::TempoMap::BBTPointList::const_iterator i;
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double beat_density;
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uint32_t beats = 0;
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uint32_t bars = 0;
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uint32_t color;
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/* get the first bar spacing */
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i = end;
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i--;
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bars = (*i).bar - (*begin).bar;
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beats = distance (begin, end) - bars;
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beat_density = (beats * 10.0f) / lines.canvas()->width();
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if (beat_density > 2.0f) {
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/* if the lines are too close together, they become useless */
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lines.clear ();
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return;
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}
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/* constrain divisions to a log2 factor to cap line density */
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while (divisions > 3 && beat_density * divisions > 0.4) {
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divisions /= 2;
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}
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lines.clear ();
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if (beat_density <= 0.12 && begin != end && begin->frame > 0) {
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/* draw subdivisions of the beat before the first visible beat line */
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ARDOUR::TempoMap::BBTPointList::const_iterator prev = begin;
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--prev;
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draw_ticks(prev, divisions, leftmost_frame, frame_rate);
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}
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for (i = begin; i != end; ++i) {
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if ((*i).is_bar()) {
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color = ARDOUR_UI::config()->color ("measure line bar");
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} else {
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if (beat_density > 0.3) {
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continue; /* only draw beat lines if the gaps between beats are large. */
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}
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color = ARDOUR_UI::config()->color_mod ("measure line beat", "measure line beat");
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}
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ArdourCanvas::Coord xpos = PublicEditor::instance().sample_to_pixel_unrounded ((*i).frame);
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lines.add (xpos, 1.0, color);
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if (beat_density <= 0.12) {
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/* draw subdivisions of this beat */
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draw_ticks(i, divisions, leftmost_frame, frame_rate);
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}
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}
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}
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