127 lines
3.0 KiB
C++
127 lines
3.0 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 "canvas/line.h"
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#include "canvas/canvas.h"
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#include "canvas/debug.h"
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#include "tempo_lines.h"
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#include "ardour_ui.h"
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using namespace std;
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TempoLines::TempoLines (ArdourCanvas::Canvas& canvas, ArdourCanvas::Group* group, double h)
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: _canvas (canvas)
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, _group (group)
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, _height (h)
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{
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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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/* remove all lines from the group, put them in the cache (to avoid
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* unnecessary object destruction+construction later), and clear _lines
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*/
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_group->clear ();
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_cache.insert (_cache.end(), _lines.begin(), _lines.end());
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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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_group->show ();
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}
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void
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TempoLines::hide ()
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{
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_group->hide ();
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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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double samples_per_pixel)
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{
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ARDOUR::TempoMap::BBTPointList::const_iterator i;
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ArdourCanvas::Rect const visible = _canvas.visible_area ();
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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) / visible.width ();
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if (beat_density > 4.0f) {
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/* if the lines are too close together, they become useless */
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tempo_map_changed();
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return;
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}
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tempo_map_changed ();
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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()->get_canvasvar_MeasureLineBar();
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} else {
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if (beat_density > 2.0) {
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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()->get_canvasvar_MeasureLineBeat();
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}
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ArdourCanvas::Coord xpos = rint(((framepos_t)(*i).frame) / (double)samples_per_pixel);
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ArdourCanvas::Line* line;
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if (!_cache.empty()) {
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line = _cache.back ();
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_cache.pop_back ();
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line->reparent (_group);
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} else {
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line = new ArdourCanvas::Line (_group);
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CANVAS_DEBUG_NAME (line, "tempo measure line");
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line->set_ignore_events (true);
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}
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/* move to 0.5 offset to ensure single pixel lines (see Cairo
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* FAQ for info on why we do this).
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*/
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line->set_x0 (xpos + 0.5);
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line->set_x1 (xpos + 0.5);
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line->set_y0 (0.0);
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line->set_y1 (_height);
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line->set_outline_color (color);
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line->show ();
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}
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}
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