7fc3b0c34c
Replaces the list of points in TempoMap with TempoSection functions, which compute tempo-at or tick-at time relative to tempo section start. TempoMap consults them additively to determine things like bbt_time(), frame_time() get_grid() etc. This has a marked effect on scrolling speed along with the code simplification in the places it has been attempted. Several things are broken here. Currently every ramp except the last one is an exponential ramp. this may be simple to fix :). Mouse-over midi grid doesn't match mouse click grid. should also be simple. Many things seem to work, but their accuracy should be in question until each area has been addressed.
151 lines
4.4 KiB
C++
151 lines
4.4 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 "tempo_lines.h"
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#include "public_editor.h"
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#include "rgb_macros.h"
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#include "ui_config.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 (std::vector<ARDOUR::TempoMap::BBTPoint>& grid,
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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 = grid.begin()->tempo->frames_per_beat(frame_rate);
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const uint32_t base = UIConfiguration::instance().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 = grid.begin()->frame + (l * (fpb / (double)divisions));
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//const framepos_t f = frame_at_tick (last_beat_in_ticks + (l * (BBT_Time::ticks_per_beat / (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 (std::vector<ARDOUR::TempoMap::BBTPoint>& grid,
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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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std::vector<ARDOUR::TempoMap::BBTPoint>::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 = grid.end();
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i--;
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bars = (*i).bar - (*grid.begin()).bar;
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beats = distance (grid.begin(), grid.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 && grid.begin() != grid.end() && grid.begin()->frame > 0) {
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/* draw subdivisions of the beat before the first visible beat line XX this shouldn't happen now */
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std::vector<ARDOUR::TempoMap::BBTPoint> vec;
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vec.push_back (*i);
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draw_ticks (vec, divisions, leftmost_frame, frame_rate);
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}
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for (i = grid.begin(); i != grid.end(); ++i) {
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if ((*i).is_bar()) {
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color = UIConfiguration::instance().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 = UIConfiguration::instance().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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std::vector<ARDOUR::TempoMap::BBTPoint> vec;
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vec.push_back (*i);
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draw_ticks(vec, divisions, leftmost_frame, frame_rate);
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}
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}
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}
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