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/* abGate - LV2 Noise Gate Plugin
*
* Copyright 2011 Antanas Bružas
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <cmath>
#include "knob.h"
using namespace std;
knob::knob(const sigc::slot<void> knob_slot, double default_value, double min, double max, double step) :
current_frame(0), all_frames(50), a_knb(new Adjustment(default_value, min, max, step, 1.0, 0)) {
set_events(Gdk::EXPOSURE_MASK | Gdk::BUTTON_PRESS_MASK | Gdk::BUTTON_RELEASE_MASK | Gdk::POINTER_MOTION_MASK);
set_double_buffered(true);
pixbuf = Gdk::Pixbuf::create_from_file(KNOB_PNG);
connecting(a_knb, knob_slot);
set_picture_size(100, 100);
value_changed();
}
knob::~knob() {
}
void knob::set_picture_size(int x, int y) {
width = x;
center_x = (gint)(x * 0.5);
height = y;
center_y = (gint)(y * 0.5);
set_size_request(x, y);
}
void knob::connecting(Adjustment* knb, const sigc::slot<void> slot) {
a_knb = knb;
// Triggering value_changed method when value of the knob changes
a_knb->signal_value_changed().connect(mem_fun(*this, &knob::value_changed));
// Updating LV2 port values when value of the knob changes
a_knb->signal_value_changed().connect(slot);
value_changed();
}
void knob::value_changed() {
// Calculating new frame from the knob value
new_frame = (int) (-0.5 + all_frames * (a_knb->get_value() - a_knb->get_lower()) / (a_knb->get_upper() - a_knb->get_lower()));
if (current_frame != new_frame) {
current_frame = new_frame;
// Also can be used like this: sig_done.emit()
sig_done();
}
}
bool knob::on_expose_event(GdkEventExpose *ev) {
if (pixbuf && ev) {
// Drawing new pixbuf
m_drawable = get_window();
m_drawable->draw_pixbuf(get_style()->get_black_gc(), pixbuf, get_width(), get_height() * current_frame - 1, 0, 0, get_width(), get_height(), Gdk::RGB_DITHER_NONE, 0, 0);
// This one is deprecated: pixbuf->render_to_drawable(get_window(), get_style()->get_black_gc(), get_width(), get_height()*current_frame-1, 0, 0, get_width(), get_height(), Gdk::RGB_DITHER_NONE, 0, 0);
}
return TRUE;
}
bool knob::on_button_press_event(GdkEventButton *ev) {
widget_x = (gint)(ev->x_root - ev->x);
widget_y = (gint)(ev->y_root - ev->y);
gint x, y;
GdkModifierType modifiers;
gdk_window_get_pointer(ev->window, &x, &y, &modifiers);
switch (ev->button) {
case 1:
if (modifiers & GDK_CONTROL_MASK) {
a_knb->set_value((a_knb->get_lower() + a_knb->get_upper()) / 2);
} else {
add_modal_grab();
mouse_pos_change((gint) ev->x_root, (gint) ev->y_root);
}
break;
case 4: // mouse wheel up
a_knb->set_value((a_knb->get_value() + a_knb->get_step_increment()));
break;
case 5: // mouse wheel down
a_knb->set_value((a_knb->get_value() - a_knb->get_step_increment()));
break;
default:
break;
}
return true;
}
bool knob::on_button_release_event(GdkEventButton *) {
if (has_grab()) {
remove_modal_grab();
}
return true;
}
bool knob::on_motion_notify_event(GdkEventMotion *ev) {
if (has_grab()) {
mouse_pos_change((gint) ev->x_root, (gint) ev->y_root);
}
return true;
}
void knob::mouse_pos_change(gint x_abs, gint y_abs) {
gfloat x = x_abs - (widget_x + center_x);
gfloat y = y_abs - (widget_y + center_y);
gfloat angle = atan(y / x);
// map angle to range [0-2*PI] (0-360 degrees)
if (x < 0) {
angle += M_PI;
} else if (y <= 0) {
angle += 2 * M_PI;
}
// map so 0 degrees/rads is at the bottom of the dial
angle -= M_PI / 2;
if ((x > 0) && (y > 0)) {
angle += 2 * M_PI;
}
// map to range 30deg - 330 deg
if (angle < M_PI / 6) {
angle = M_PI / 6;
} else if (angle > 11 * M_PI / 6) {
angle = M_PI * 11 / 6;
}
// set adjustment value accordingly
float val = (angle - M_PI / 6) / (M_PI * 10 / 6);
val *= (a_knb->get_upper() - a_knb->get_lower());
val += (a_knb->get_lower());
a_knb->set_value(val);
}
// Returns knob value
float knob::get_knob_value() {
return a_knb->get_value();
}
// Sets knob value
void knob::set_knob_value(float value) {
a_knb->set_value(value);
}
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