diff options
Diffstat (limited to 'gtk2_ardour/tempo_lines.cc')
-rw-r--r-- | gtk2_ardour/tempo_lines.cc | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/gtk2_ardour/tempo_lines.cc b/gtk2_ardour/tempo_lines.cc new file mode 100644 index 0000000000..daaa2dcd34 --- /dev/null +++ b/gtk2_ardour/tempo_lines.cc @@ -0,0 +1,122 @@ +/* + Copyright (C) 2002-2007 Paul Davis + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + +*/ + +#include <libgnomecanvasmm/canvas.h> +#include <libgnomecanvasmm/group.h> +#include "tempo_lines.h" +#include "ardour_ui.h" + + +ArdourCanvas::SimpleLine * +TempoLines::get_line () +{ + ArdourCanvas::SimpleLine *line; + + if (_free_lines.empty()) { + line = new ArdourCanvas::SimpleLine (*_group); + _used_lines.push_back (line); + } else { + line = _free_lines.front(); + _free_lines.erase (_free_lines.begin()); + _used_lines.push_back (line); + } + + return line; +} + + +void +TempoLines::hide () +{ + for (Lines::iterator i = _used_lines.begin(); i != _used_lines.end(); ++i) { + (*i)->hide(); + _free_lines.push_back (*i); + } + _used_lines.clear (); +} + + +void +TempoLines::draw (ARDOUR::TempoMap::BBTPointList& points, double frames_per_unit) +{ + ARDOUR::TempoMap::BBTPointList::iterator i; + ArdourCanvas::SimpleLine *line; + gdouble xpos; + double who_cares; + double x1, x2, y1, y2, beat_density; + + uint32_t beats = 0; + uint32_t bars = 0; + uint32_t color; + + _canvas.get_scroll_region (x1, y1, x2, who_cares); + _canvas.root()->get_bounds(who_cares, who_cares, who_cares, y2); + + // FIXME use canvas height + //y2 = TimeAxisView::hLargest*5000; // five thousand largest tracks should be enough.. :) + //y2 = 500000; // five thousand largest tracks should be enough.. :) + + /* get the first bar spacing */ + + i = points.end(); + i--; + bars = (*i).bar - (*points.begin()).bar; + beats = points.size() - bars; + + beat_density = (beats * 10.0f) / _canvas.get_width (); + + if (beat_density > 4.0f) { + /* if the lines are too close together, they become useless + */ + return; + } + + for (i = points.begin(); i != points.end(); ++i) { + + switch ((*i).type) { + case ARDOUR::TempoMap::Bar: + break; + + case ARDOUR::TempoMap::Beat: + + if ((*i).beat == 1) { + color = ARDOUR_UI::config()->canvasvar_MeasureLineBar.get(); + } else { + color = ARDOUR_UI::config()->canvasvar_MeasureLineBeat.get(); + + if (beat_density > 2.0) { + /* only draw beat lines if the gaps between beats are large. + */ + break; + } + } + + xpos = rint((*i).frame / (double)frames_per_unit); + line = get_line (); + line->property_x1() = xpos; + line->property_x2() = xpos; + line->property_y2() = y2; + line->property_color_rgba() = color; + //line->raise_to_top(); + line->show(); + break; + } + } +} + |