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livetrax/libs/surfaces/maschine2/ui_knob.cc

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/*
* Copyright (C) 2016 Robin Gareus <robin@gareus.org>
*
* 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.
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*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
#include <cmath>
#include <cairomm/context.h>
#include "ardour/automation_control.h"
#include "ardour/value_as_string.h"
#include "ardour/dB.h"
#include "ardour/utils.h"
#include "gtkmm2ext/colors.h"
#include "gtkmm2ext/gui_thread.h"
#include "gtkmm2ext/rgb_macros.h"
#include "canvas/text.h"
#include "maschine2.h"
#include "m2controls.h"
#include "ui_knob.h"
#include "pbd/i18n.h"
#ifdef __APPLE__
#define Rect ArdourCanvas::Rect
#endif
using namespace PBD;
using namespace ARDOUR;
using namespace ArdourSurface;
using namespace ArdourCanvas;
Maschine2Knob::Maschine2Knob (PBD::EventLoop* el, Item* parent)
: Container (parent)
, _ctrl (0)
, _eventloop (el)
, _radius (11)
, _val (0)
, _normal (0)
{
Pango::FontDescription fd ("Sans 10px");
text = new Text (this);
text->set_font_description (fd);
text->set_position (Duple (-_radius, _radius + 2));
text->set_color (0xffffffff);
_bounding_box_dirty = true;
}
Maschine2Knob::~Maschine2Knob ()
{
}
void
Maschine2Knob::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) const
{
if (!_controllable) {
/* no controllable, nothing to draw */
return;
}
// TODO consider a "bar" circular shape + 1bit b/w is ugly
const float scale = 2.f * _radius;
const float pointer_thickness = std::max (1.f, 3.f * (scale / 80.f));
const float start_angle = ((180.f - 65.f) * M_PI) / 180.f;
const float end_angle = ((360.f + 65.f) * M_PI) / 180.f;
float zero = 0;
const float value_angle = start_angle + (_val * (end_angle - start_angle));
const float zero_angle = start_angle + (zero * (end_angle - start_angle));
float value_x = cos (value_angle);
float value_y = sin (value_angle);
/* translate so that all coordinates are based on the center of the
* knob (which is also its position()
*/
context->save ();
Duple origin = item_to_window (Duple (0, 0));
context->translate (origin.x - 0.5, origin.y - 0.5);
context->begin_new_path ();
float center_radius = 0.48*scale;
float border_width = 0.8;
const bool arc = true;
if (arc) {
center_radius = scale * 0.33;
float inner_progress_radius = scale * 0.38;
float outer_progress_radius = scale * 0.48;
float progress_width = (outer_progress_radius-inner_progress_radius);
float progress_radius = inner_progress_radius + progress_width/2.0;
// draw the arc
context->set_source_rgb (1, 1, 1);
context->set_line_width (progress_width);
if (zero_angle > value_angle) {
context->arc (0, 0, progress_radius, value_angle, zero_angle);
} else {
context->arc (0, 0, progress_radius, zero_angle, value_angle);
}
context->stroke ();
}
// knob body
context->set_line_width (border_width);
context->set_source_rgb (1, 1, 1);
context->arc (0, 0, center_radius, 0, 2.0*G_PI);
context->fill ();
// line
context->set_source_rgb (0, 0, 0);
context->set_line_cap (Cairo::LINE_CAP_ROUND);
context->set_line_width (pointer_thickness);
context->move_to ((center_radius * value_x), (center_radius * value_y));
context->line_to (((center_radius * 0.2) * value_x), ((center_radius * 0.2) * value_y));
context->stroke ();
/* reset all translations, scaling etc. */
context->restore ();
render_children (area, context);
}
void
Maschine2Knob::compute_bounding_box () const
{
if (!_canvas || _radius == 0) {
_bounding_box = Rect ();
_bounding_box_dirty = false;
return;
}
if (_bounding_box_dirty) {
_bounding_box = Rect (- _radius, - _radius, _radius, _radius);
_bounding_box_dirty = false;
}
/* Item::bounding_box() will add children */
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}
void
Maschine2Knob::set_controllable (boost::shared_ptr<AutomationControl> c)
{
watch_connection.disconnect ();
if (!c) {
_controllable.reset ();
return;
}
_controllable = c;
_controllable->Changed.connect (watch_connection, invalidator(*this), boost::bind (&Maschine2Knob::controllable_changed, this), _eventloop);
controllable_changed ();
// set _controllable->desc()->label
}
void
Maschine2Knob::set_control (M2EncoderInterface* ctrl)
{
encoder_connection.disconnect ();
_ctrl = ctrl;
if (!ctrl) {
return;
}
ctrl->changed.connect_same_thread (encoder_connection, boost::bind (&Maschine2Knob::encoder_changed, this, _1));
}
void
Maschine2Knob::encoder_changed (int delta)
{
if (!_controllable) {
return;
}
const double d = delta * 0.5 / _ctrl->range ();
boost::shared_ptr<AutomationControl> ac = _controllable;
ac->set_value (ac->interface_to_internal (std::min (ac->upper(), std::max (ac->lower(), ac->internal_to_interface (ac->get_value()) + d))), PBD::Controllable::UseGroup);
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}
void
Maschine2Knob::controllable_changed ()
{
if (_controllable) {
_normal = _controllable->internal_to_interface (_controllable->normal());
_val = _controllable->internal_to_interface (_controllable->get_value());
const ParameterDescriptor& desc (_controllable->desc());
char buf[64];
switch (_controllable->parameter().type()) {
case ARDOUR::PanAzimuthAutomation:
snprintf (buf, sizeof (buf), _("L:%3d R:%3d"), (int) rint (100.0 * (1.0 - _val)), (int) rint (100.0 * _val));
text->set (buf);
break;
case ARDOUR::PanWidthAutomation:
snprintf (buf, sizeof (buf), "%d%%", (int) floor (_val*100));
text->set (buf);
break;
case ARDOUR::GainAutomation:
case ARDOUR::BusSendLevel:
case ARDOUR::TrimAutomation:
snprintf (buf, sizeof (buf), "%+4.1f dB", accurate_coefficient_to_dB (_controllable->get_value()));
text->set (buf);
break;
default:
text->set (ARDOUR::value_as_string (desc, _val));
break;
}
} else {
text->set ("---");
}
redraw ();
}