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livetrax/gtk2_ardour/ardour_knob.cc

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/*
Copyright (C) 2010 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 <iostream>
#include <cmath>
#include <algorithm>
#include <pangomm/layout.h>
#include "pbd/compose.h"
#include "pbd/error.h"
#include "pbd/stacktrace.h"
#include "gtkmm2ext/utils.h"
#include "gtkmm2ext/rgb_macros.h"
#include "gtkmm2ext/gui_thread.h"
#include "gtkmm2ext/keyboard.h"
#include "ardour/rc_configuration.h" // for widget prelight preference
#include "ardour_knob.h"
#include "ardour_ui.h"
#include "global_signals.h"
#include "canvas/utils.h"
#include "i18n.h"
using namespace Gtkmm2ext;
using namespace Gdk;
using namespace Gtk;
using namespace Glib;
using namespace PBD;
using std::max;
using std::min;
using namespace std;
ArdourKnob::Element ArdourKnob::default_elements = ArdourKnob::Element (ArdourKnob::Arc);
ArdourKnob::ArdourKnob (Element e)
: _elements (e)
, _hovering (false)
{
ARDOUR_UI_UTILS::ColorsChanged.connect (sigc::mem_fun (*this, &ArdourKnob::color_handler));
}
ArdourKnob::~ArdourKnob()
{
}
void
ArdourKnob::render (cairo_t* cr, cairo_rectangle_t *)
{
cairo_pattern_t* shade_pattern;
float width = get_width();
float height = get_height();
const float scale = min(width, height);
const float pointer_thickness = 3.0 * (scale/80); //(if the knob is 80 pixels wide, we want a 3-pix line on it)
float start_angle = ((180 - 65) * G_PI) / 180;
float end_angle = ((360 + 65) * G_PI) / 180;
float value_angle = start_angle + (_val * (end_angle - start_angle));
float value_x = cos (value_angle);
float value_y = sin (value_angle);
float xc = 0.5 + width/ 2.0;
float yc = 0.5 + height/ 2.0;
cairo_translate (cr, xc, yc); //after this, everything is based on the center of the knob
//get the knob color from the theme
ArdourCanvas::Color knob_color = ARDOUR_UI::config()->color_by_name (string_compose ("%1", get_name()));
float center_radius = 0.48*scale;
float border_width = 0.8;
bool arc = (_elements & Arc)==Arc;
bool bevel = (_elements & Bevel)==Bevel;
2014-08-27 12:53:30 -04:00
bool flat = _flat_buttons;
if ( arc ) {
center_radius = scale*0.30;
float inner_progress_radius = scale*0.30;
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;
float start_angle_x = cos (start_angle);
float start_angle_y = sin (start_angle);
float end_angle_x = cos (end_angle);
float end_angle_y = sin (end_angle);
//dark arc background
cairo_set_source_rgb (cr, 0.3, 0.3, 0.3 );
cairo_set_line_width (cr, progress_width);
cairo_arc (cr, 0, 0, progress_radius, start_angle, end_angle);
cairo_stroke (cr);
//look up the arc colors from the config
double red_start, green_start, blue_start, unused;
ArdourCanvas::Color arc_start_color = ARDOUR_UI::config()->color_by_name ( string_compose ("%1: arc start", get_name()));
ArdourCanvas::color_to_rgba( arc_start_color, red_start, green_start, blue_start, unused );
double red_end, green_end, blue_end;
ArdourCanvas::Color arc_end_color = ARDOUR_UI::config()->color_by_name ( string_compose ("%1: arc end", get_name()) );
ArdourCanvas::color_to_rgba( arc_end_color, red_end, green_end, blue_end, unused );
//vary the arc color over the travel of the knob
float r = (1.0-_val) * red_end + _val * red_start;
float g = (1.0-_val) * green_end + _val * green_start;
float b = (1.0-_val) * blue_end + _val * blue_start;
//draw the arc
cairo_set_source_rgb (cr, r,g,b);
cairo_set_line_width (cr, progress_width);
cairo_arc (cr, 0, 0, progress_radius, start_angle, value_angle);
cairo_stroke (cr);
//shade the arc
if (!flat) {
shade_pattern = cairo_pattern_create_linear (0.0, -yc, 0.0, yc); //note we have to offset the pattern from our centerpoint
cairo_pattern_add_color_stop_rgba (shade_pattern, 0.0, 1,1,1, 0.15);
cairo_pattern_add_color_stop_rgba (shade_pattern, 0.5, 1,1,1, 0.0);
cairo_pattern_add_color_stop_rgba (shade_pattern, 1.0, 1,1,1, 0.0);
cairo_set_source (cr, shade_pattern);
cairo_arc (cr, 0, 0, outer_progress_radius-1, 0, 2.0*G_PI);
cairo_fill (cr);
cairo_pattern_destroy (shade_pattern);
}
//black border
cairo_set_source_rgb (cr, 0, 0, 0 );
cairo_set_line_width (cr, border_width);
cairo_move_to (cr, (outer_progress_radius * start_angle_x), (outer_progress_radius * start_angle_y));
cairo_line_to (cr, (inner_progress_radius * start_angle_x), (inner_progress_radius * start_angle_y));
cairo_stroke (cr);
cairo_move_to (cr, (outer_progress_radius * end_angle_x), (outer_progress_radius * end_angle_y));
cairo_line_to (cr, (inner_progress_radius * end_angle_x), (inner_progress_radius * end_angle_y));
cairo_stroke (cr);
cairo_arc (cr, 0, 0, outer_progress_radius, start_angle, end_angle);
cairo_stroke (cr);
}
if (!flat) {
//knob shadow
cairo_save(cr);
cairo_translate(cr, pointer_thickness+1, pointer_thickness+1 );
cairo_set_source_rgba (cr, 0, 0, 0, 0.1 );
cairo_arc (cr, 0, 0, center_radius-1, 0, 2.0*G_PI);
cairo_fill (cr);
cairo_restore(cr);
//inner circle
ArdourCanvas::set_source_rgba(cr, knob_color);
cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
cairo_fill (cr);
//gradient
if (bevel) {
//knob gradient
shade_pattern = cairo_pattern_create_linear (0.0, -yc, 0.0, yc); //note we have to offset the gradient from our centerpoint
cairo_pattern_add_color_stop_rgba (shade_pattern, 0.0, 1,1,1, 0.2);
cairo_pattern_add_color_stop_rgba (shade_pattern, 0.2, 1,1,1, 0.2);
cairo_pattern_add_color_stop_rgba (shade_pattern, 0.8, 0,0,0, 0.2);
cairo_pattern_add_color_stop_rgba (shade_pattern, 1.0, 0,0,0, 0.2);
cairo_set_source (cr, shade_pattern);
cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
cairo_fill (cr);
cairo_pattern_destroy (shade_pattern);
//flat top over beveled edge
ArdourCanvas::set_source_rgb_a (cr, knob_color, 0.5 );
cairo_arc (cr, 0, 0, center_radius-pointer_thickness, 0, 2.0*G_PI);
cairo_fill (cr);
} else {
//radial gradient
shade_pattern = cairo_pattern_create_radial ( -center_radius, -center_radius, 1, -center_radius, -center_radius, center_radius*2.5 ); //note we have to offset the gradient from our centerpoint
cairo_pattern_add_color_stop_rgba (shade_pattern, 0.0, 1,1,1, 0.2);
cairo_pattern_add_color_stop_rgba (shade_pattern, 1.0, 0,0,0, 0.3);
cairo_set_source (cr, shade_pattern);
cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
cairo_fill (cr);
cairo_pattern_destroy (shade_pattern);
}
} else {
//inner circle
ArdourCanvas::set_source_rgba(cr, knob_color);
cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
cairo_fill (cr);
}
//black knob border
cairo_set_line_width (cr, border_width);
cairo_set_source_rgba (cr, 0,0,0, 1 );
cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
cairo_stroke (cr);
//line shadow
if (!flat) {
cairo_save(cr);
cairo_translate(cr, 1, 1 );
cairo_set_source_rgba (cr, 0,0,0,0.3 );
cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
cairo_set_line_width (cr, pointer_thickness);
cairo_move_to (cr, (center_radius * value_x), (center_radius * value_y));
cairo_line_to (cr, ((center_radius*0.4) * value_x), ((center_radius*0.4) * value_y));
cairo_stroke (cr);
cairo_restore(cr);
}
//line
cairo_set_source_rgba (cr, 1,1,1, 1 );
cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
cairo_set_line_width (cr, pointer_thickness);
cairo_move_to (cr, (center_radius * value_x), (center_radius * value_y));
cairo_line_to (cr, ((center_radius*0.4) * value_x), ((center_radius*0.4) * value_y));
cairo_stroke (cr);
//highlight if grabbed or if mouse is hovering over me
if ( _grabbed || (_hovering && ARDOUR::Config->get_widget_prelight() ) ) {
cairo_set_source_rgba (cr, 1,1,1, 0.12 );
cairo_arc (cr, 0, 0, center_radius, 0, 2.0*G_PI);
cairo_fill (cr);
}
cairo_identity_matrix(cr);
}
void
ArdourKnob::on_size_request (Gtk::Requisition* req)
{
CairoWidget::on_size_request (req);
//perhaps render the knob base into a cached image here?
}
bool
ArdourKnob::on_scroll_event (GdkEventScroll* ev)
{
/* mouse wheel */
float scale = 0.05; //by default, we step in 1/20ths of the knob travel
if (ev->state & Keyboard::GainFineScaleModifier) {
if (ev->state & Keyboard::GainExtraFineScaleModifier) {
scale *= 0.01;
} else {
scale *= 0.10;
}
}
boost::shared_ptr<PBD::Controllable> c = binding_proxy.get_controllable();
if (c) {
float val = c->get_interface();
if ( ev->direction == GDK_SCROLL_UP )
val += scale;
else
val -= scale;
c->set_interface(val);
}
return true;
}
bool
ArdourKnob::on_motion_notify_event (GdkEventMotion *ev)
{
//scale the adjustment based on keyboard modifiers
float scale = 0.0025;
if (ev->state & Keyboard::GainFineScaleModifier) {
if (ev->state & Keyboard::GainExtraFineScaleModifier) {
scale *= 0.01;
} else {
scale *= 0.10;
}
}
//calculate the travel of the mouse
int y_delta = 0;
if (ev->state & Gdk::BUTTON1_MASK) {
y_delta = _grabbed_y - ev->y;
_grabbed_y = ev->y;
if (y_delta == 0) return TRUE;
}
//step the value of the controllable
boost::shared_ptr<PBD::Controllable> c = binding_proxy.get_controllable();
if (c) {
float val = c->get_interface();
val += y_delta * scale;
c->set_interface(val);
}
return true;
}
bool
ArdourKnob::on_button_press_event (GdkEventButton *ev)
{
_grabbed_y = ev->y;
_grabbed = true;
set_active_state (Gtkmm2ext::ExplicitActive);
if (binding_proxy.button_press_handler (ev)) {
return true;
}
return false;
}
bool
ArdourKnob::on_button_release_event (GdkEventButton *ev)
{
if ( (_grabbed_y == ev->y) && Keyboard::modifier_state_equals (ev->state, Keyboard::TertiaryModifier)) { //no move, shift-click sets to default
boost::shared_ptr<PBD::Controllable> c = binding_proxy.get_controllable();
if (!c) return false;
c->set_value (c->normal());
return true;
}
_grabbed = false;
unset_active_state ();
return false;
}
void
ArdourKnob::color_handler ()
{
set_dirty ();
}
void
ArdourKnob::on_size_allocate (Allocation& alloc)
{
CairoWidget::on_size_allocate (alloc);
}
void
ArdourKnob::set_controllable (boost::shared_ptr<Controllable> c)
{
watch_connection.disconnect (); //stop watching the old controllable
if (!c) return;
binding_proxy.set_controllable (c);
c->Changed.connect (watch_connection, invalidator(*this), boost::bind (&ArdourKnob::controllable_changed, this), gui_context());
controllable_changed();
}
void
ArdourKnob::controllable_changed ()
{
_val = binding_proxy.get_controllable()->get_interface(); //% of knob travel
_val = min( max(0.0f, _val), 1.0f); //range check
set_dirty();
}
void
ArdourKnob::on_style_changed (const RefPtr<Gtk::Style>&)
{
set_dirty ();
}
void
ArdourKnob::on_name_changed ()
{
set_dirty ();
}
void
ArdourKnob::set_active_state (Gtkmm2ext::ActiveState s)
{
if (_active_state != s)
CairoWidget::set_active_state (s);
}
void
ArdourKnob::set_visual_state (Gtkmm2ext::VisualState s)
{
if (_visual_state != s)
CairoWidget::set_visual_state (s);
}
bool
ArdourKnob::on_focus_in_event (GdkEventFocus* ev)
{
set_dirty ();
return CairoWidget::on_focus_in_event (ev);
}
bool
ArdourKnob::on_focus_out_event (GdkEventFocus* ev)
{
set_dirty ();
return CairoWidget::on_focus_out_event (ev);
}
bool
ArdourKnob::on_enter_notify_event (GdkEventCrossing* ev)
{
_hovering = true;
set_dirty ();
return CairoWidget::on_enter_notify_event (ev);
}
bool
ArdourKnob::on_leave_notify_event (GdkEventCrossing* ev)
{
_hovering = false;
set_dirty ();
return CairoWidget::on_leave_notify_event (ev);
}
void
ArdourKnob::set_elements (Element e)
{
_elements = e;
}
void
ArdourKnob::add_elements (Element e)
{
_elements = (ArdourKnob::Element) (_elements | e);
}