Tempo ramps - pressing constraint modifier keys during tempo drag changes tempo with vertical movement, incorporating beat constraint (if present).

- makes it easy to find suitable accelerandos for hit points in conjunction
	  with playhead position, beat-locked tempos and initial meter frame.

gtk2_ardour/editor_drag.cc

@@ -3312,17 +3312,24 @@ TempoMarkerDrag::motion (GdkEvent* event, bool first_move)
 		_marker->hide();
 	}
 
-	framepos_t const pf = adjusted_current_frame (event, false);
+	framepos_t const pf = adjusted_current_frame (event);
 	Tempo const tp = _marker->tempo();
 	_marker->set_position (pf);
-	/* just here for a check/laugh
-	if (_real_section->position_lock_style() == MusicTime) {
-		const double baf = _editor->session()->tempo_map().beat_at_frame (pf);
-		_editor->session()->tempo_map().gui_move_tempo_beat (_real_section, tp, baf);
+
+	if (Keyboard::modifier_state_equals (event->button.state, ArdourKeyboard::constraint_modifier ())) {
+		double new_bpm = tp.beats_per_minute() + ((grab_y() - current_pointer_y()) / 4.0);
+		_real_section->set_beats_per_minute (new_bpm);
+		_editor->session()->tempo_map().gui_change_tempo (_real_section, Tempo (new_bpm, _real_section->note_type()));
 	} else {
-	*/
-	_editor->session()->tempo_map().gui_move_tempo_frame (_real_section, tp, pf);
-	//}
+		/* just here for a check/laugh
+		   if (_real_section->position_lock_style() == MusicTime) {
+		   const double baf = _editor->session()->tempo_map().beat_at_frame (pf);
+		   _editor->session()->tempo_map().gui_move_tempo_beat (_real_section, tp, baf);
+		   } else {
+		*/
+		_editor->session()->tempo_map().gui_move_tempo_frame (_real_section, tp, pf);
+		//}
+	}
 
 	show_verbose_cursor_time (pf);
 }
@@ -3362,11 +3369,11 @@ TempoMarkerDrag::finished (GdkEvent* event, bool movement_occurred)
 
 	} else {
 		if (_marker->tempo().position_lock_style() == MusicTime) {
-			double const pulse = map.predict_tempo_pulse (_real_section, _marker->tempo(), _real_section->frame());
-			map.replace_tempo (*_real_section, Tempo (_marker->tempo().beats_per_minute(), _marker->tempo().note_type())
+			double const pulse = map.predict_tempo_pulse (_real_section, Tempo (_real_section->beats_per_minute(), _real_section->note_type()), _real_section->frame());
+			map.replace_tempo (*_real_section, Tempo (_real_section->beats_per_minute(), _real_section->note_type())
 					   , pulse, _marker->tempo().type());
 		} else {
-			map.replace_tempo (*_real_section, Tempo (_marker->tempo().beats_per_minute(), _marker->tempo().note_type())
+			map.replace_tempo (*_real_section, Tempo (_real_section->beats_per_minute(), _real_section->note_type())
 					   , _real_section->frame(), _marker->tempo().type());
 		}
 

gtk2_ardour/editor_drag.h

@@ -727,7 +727,7 @@ public:
 	}
 
 	bool y_movement_matters () const {
-		return false;
+		return true;
 	}
 
 	void setup_pointer_frame_offset ();

gtk2_ardour/editor_mouse.cc

@@ -684,7 +684,7 @@ Editor::button_press_handler_1 (ArdourCanvas::Item* item, GdkEvent* event, ItemT
 			new TempoMarkerDrag (
 				this,
 				item,
-				Keyboard::modifier_state_contains (event->button.state, Keyboard::CopyModifier)
+				Keyboard::modifier_state_equals (event->button.state, Keyboard::CopyModifier)
 				),
 			event
 			);

gtk2_ardour/editor_tempodisplay.cc

@@ -143,6 +143,9 @@ Editor::marker_position_changed ()
 		if ((tempo_marker = dynamic_cast<TempoMarker*> (*x)) != 0) {
 			if ((ts = &tempo_marker->tempo()) != 0) {
 				tempo_marker->set_position (ts->frame ());
+				char buf[64];
+				snprintf (buf, sizeof (buf), "%.2f", ts->beats_per_minute());
+				tempo_marker->set_name (buf);
 			}
 		}
 		if ((meter_marker = dynamic_cast<MeterMarker*> (*x)) != 0) {

libs/ardour/ardour/tempo.h

@@ -56,6 +56,7 @@ class LIBARDOUR_API Tempo {
 		: _beats_per_minute (bpm), _note_type(type) {}
 
 	double beats_per_minute () const { return _beats_per_minute; }
+	void set_beats_per_minute (double bpm) { _beats_per_minute = bpm; }
 	double note_type () const { return _note_type; }
 	double pulses_per_minute () const { return _beats_per_minute / _note_type; }
 	/** audio samples per beat
@@ -387,6 +388,7 @@ class LIBARDOUR_API TempoMap : public PBD::StatefulDestructible
 	void gui_move_tempo_beat (TempoSection*, const Tempo& bpm, const double& frame);
 	void gui_move_meter (MeterSection*, const Meter& mt, const framepos_t& frame);
 	void gui_move_meter (MeterSection*, const Meter& mt, const double& beat);
+	bool gui_change_tempo (TempoSection*, const Tempo& bpm);
 
 	bool can_solve_bbt (TempoSection* section, const Tempo& bpm, const Timecode::BBT_Time& bbt);
 

libs/ardour/tempo.cc

@@ -1159,6 +1159,34 @@ TempoMap::gui_move_meter (MeterSection* ms, const Meter& mt, const double&  beat
 	MetricPositionChanged (); // Emit Signal
 }
 
+bool
+TempoMap::gui_change_tempo (TempoSection* ts,  const Tempo& bpm)
+{
+	Metrics future_map;
+	bool can_solve = false;
+	{
+		Glib::Threads::RWLock::WriterLock lm (lock);
+		TempoSection* new_section = copy_metrics_and_point (future_map, ts);
+		new_section->set_beats_per_minute (bpm.beats_per_minute());
+		recompute_tempos (future_map);
+
+		if (check_solved (future_map, true)) {
+			ts->set_beats_per_minute (bpm.beats_per_minute());
+			recompute_map (_metrics);
+			can_solve = true;
+		}
+	}
+
+	Metrics::const_iterator d = future_map.begin();
+	while (d != future_map.end()) {
+		delete (*d);
+		++d;
+	}
+	if (can_solve) {
+		MetricPositionChanged (); // Emit Signal
+	}
+	return can_solve;
+}
 TempoSection*
 TempoMap::copy_metrics_and_point (Metrics& copy, TempoSection* section)
 {
@@ -1949,6 +1977,7 @@ TempoMap::solve_map (Metrics& imaginary, TempoSection* section, const Tempo& bpm
 	MetricSectionSorter cmp;
 
 	section->set_frame (frame);
+
 	for (Metrics::iterator i = imaginary.begin(); i != imaginary.end(); ++i) {
 		TempoSection* t;
 		if ((t = dynamic_cast<TempoSection*> (*i)) != 0) {
@@ -1970,7 +1999,7 @@ TempoMap::solve_map (Metrics& imaginary, TempoSection* section, const Tempo& bpm
 	}
 
 	if (section_prev) {
-		section_prev->set_c_func (section_prev->compute_c_func_pulse (section->pulses_per_minute(), section->pulse(), _frame_rate));
+		section_prev->set_c_func (section_prev->compute_c_func_frame (bpm.pulses_per_minute(), frame, _frame_rate));
 		section->set_pulse (section_prev->pulse_at_frame (frame, _frame_rate));
 	}
 
@@ -2029,6 +2058,7 @@ TempoMap::solve_map (Metrics& imaginary, TempoSection* section, const Tempo& bpm
 	TempoSection* section_prev = 0;
 
 	section->set_pulse (pulse);
+	section->set_beats_per_minute (bpm.beats_per_minute());
 
 	for (Metrics::iterator i = imaginary.begin(); i != imaginary.end(); ++i) {
 		TempoSection* t;
@@ -2050,7 +2080,7 @@ TempoMap::solve_map (Metrics& imaginary, TempoSection* section, const Tempo& bpm
 		}
 	}
 	if (section_prev) {
-		section_prev->set_c_func (section_prev->compute_c_func_pulse (section->pulses_per_minute(), pulse, _frame_rate));
+		section_prev->set_c_func (section_prev->compute_c_func_pulse (bpm.pulses_per_minute(), pulse, _frame_rate));
 		section->set_frame (section_prev->frame_at_pulse (pulse, _frame_rate));
 	}