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livetrax/gtk2_ardour/panner2d.cc
David Robillard ed626628b5 Delete trailing whitespace 
git-svn-id: svn://localhost/ardour2/branches/3.0@9656 d708f5d6-7413-0410-9779-e7cbd77b26cf
2011-06-01 17:00:29 +00:00

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/*
Copyright (C) 2002 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 <cmath>
#include <climits>
#include <string.h>
#include <cairo.h>
#include <gtkmm/menu.h>
#include "gtkmm2ext/gtk_ui.h"
#include "pbd/error.h"
#include "pbd/cartesian.h"
#include "ardour/panner.h"
#include "ardour/pannable.h"
#include "ardour/speakers.h"
#include "panner2d.h"
#include "keyboard.h"
#include "gui_thread.h"
#include "utils.h"
#include "public_editor.h"
#include "i18n.h"
using namespace std;
using namespace Gtk;
using namespace ARDOUR;
using namespace PBD;
using Gtkmm2ext::Keyboard;
static const int large_size_threshold = 100;
static const int large_border_width = 25;
static const int small_border_width = 8;
Panner2d::Target::Target (const AngularVector& a, const char *txt)
: position (a)
, text (txt)
, _selected (false)
{
}
Panner2d::Target::~Target ()
{
}
void
Panner2d::Target::set_text (const char* txt)
{
text = txt;
}
Panner2d::Panner2d (boost::shared_ptr<Panner> p, int32_t h)
: panner (p)
, position (AngularVector (0.0, 0.0), "")
, width (0)
, height (h)
, last_width (0)
{
panner->StateChanged.connect (connections, invalidator (*this), boost::bind (&Panner2d::handle_state_change, this), gui_context());
panner->pannable()->pan_azimuth_control->Changed.connect (connections, invalidator(*this), boost::bind (&Panner2d::handle_position_change, this), gui_context());
panner->pannable()->pan_width_control->Changed.connect (connections, invalidator(*this), boost::bind (&Panner2d::handle_position_change, this), gui_context());
drag_target = 0;
set_events (Gdk::BUTTON_PRESS_MASK|Gdk::BUTTON_RELEASE_MASK|Gdk::POINTER_MOTION_MASK);
handle_position_change ();
}
Panner2d::~Panner2d()
{
for (Targets::iterator i = speakers.begin(); i != speakers.end(); ++i) {
delete *i;
}
}
void
Panner2d::reset (uint32_t n_inputs)
{
uint32_t nouts = panner->out().n_audio();
/* signals */
while (signals.size() < n_inputs) {
add_signal ("", AngularVector());
}
if (signals.size() > n_inputs) {
for (uint32_t i = signals.size(); i < n_inputs; ++i) {
delete signals[i];
}
signals.resize (n_inputs);
}
label_signals ();
for (uint32_t i = 0; i < n_inputs; ++i) {
signals[i]->position = panner->signal_position (i);
}
/* add all outputs */
while (speakers.size() < nouts) {
add_speaker (AngularVector());
}
if (speakers.size() > nouts) {
for (uint32_t i = nouts; i < speakers.size(); ++i) {
delete speakers[i];
}
speakers.resize (nouts);
}
for (Targets::iterator x = speakers.begin(); x != speakers.end(); ++x) {
(*x)->visible = false;
}
vector<Speaker>& the_speakers (panner->get_speakers()->speakers());
for (uint32_t n = 0; n < nouts; ++n) {
char buf[16];
snprintf (buf, sizeof (buf), "%d", n+1);
speakers[n]->set_text (buf);
speakers[n]->position = the_speakers[n].angles();
speakers[n]->visible = true;
}
queue_draw ();
}
void
Panner2d::on_size_allocate (Gtk::Allocation& alloc)
{
width = alloc.get_width();
height = alloc.get_height();
if (height > large_size_threshold) {
border = large_border_width;
} else {
border = small_border_width;
}
radius = min (width, height);
radius -= border;
radius /= 2;
hoffset = max ((double) (width - height), border);
voffset = max ((double) (height - width), border);
hoffset /= 2.0;
voffset /= 2.0;
DrawingArea::on_size_allocate (alloc);
}
int
Panner2d::add_signal (const char* text, const AngularVector& a)
{
Target* signal = new Target (a, text);
signals.push_back (signal);
signal->visible = true;
return 0;
}
int
Panner2d::add_speaker (const AngularVector& a)
{
Target* speaker = new Target (a, "");
speakers.push_back (speaker);
speaker->visible = true;
queue_draw ();
return speakers.size() - 1;
}
void
Panner2d::handle_state_change ()
{
queue_draw ();
}
void
Panner2d::label_signals ()
{
double w = panner->pannable()->pan_width_control->get_value();
uint32_t sz = signals.size();
switch (sz) {
case 0:
break;
case 1:
signals[0]->set_text ("");
break;
case 2:
if (w >= 0.0) {
signals[0]->set_text ("R");
signals[1]->set_text ("L");
} else {
signals[0]->set_text ("L");
signals[1]->set_text ("R");
}
break;
default:
for (uint32_t i = 0; i < sz; ++i) {
char buf[64];
if (w >= 0.0) {
snprintf (buf, sizeof (buf), "%" PRIu32, i + 1);
} else {
snprintf (buf, sizeof (buf), "%" PRIu32, sz - i);
}
signals[i]->set_text (buf);
}
break;
}
}
void
Panner2d::handle_position_change ()
{
uint32_t n;
double w = panner->pannable()->pan_width_control->get_value();
position.position = AngularVector (panner->pannable()->pan_azimuth_control->get_value() * 360.0, 0.0);
for (uint32_t i = 0; i < signals.size(); ++i) {
signals[i]->position = panner->signal_position (i);
}
if (w * last_width <= 0) {
/* changed sign */
label_signals ();
}
last_width = w;
vector<Speaker>& the_speakers (panner->get_speakers()->speakers());
for (n = 0; n < speakers.size(); ++n) {
speakers[n]->position = the_speakers[n].angles();
}
queue_draw ();
}
void
Panner2d::move_signal (int which, const AngularVector& a)
{
if (which >= int (speakers.size())) {
return;
}
speakers[which]->position = a;
queue_draw ();
}
Panner2d::Target *
Panner2d::find_closest_object (gdouble x, gdouble y, bool& is_signal)
{
Target *closest = 0;
Target *candidate;
float distance;
float best_distance = FLT_MAX;
CartesianVector c;
/* start with the position itself
*/
position.position.cartesian (c);
cart_to_gtk (c);
best_distance = sqrt ((c.x - x) * (c.x - x) +
(c.y - y) * (c.y - y));
closest = &position;
for (Targets::const_iterator i = signals.begin(); i != signals.end(); ++i) {
candidate = *i;
candidate->position.cartesian (c);
cart_to_gtk (c);
distance = sqrt ((c.x - x) * (c.x - x) +
(c.y - y) * (c.y - y));
if (distance < best_distance) {
closest = candidate;
best_distance = distance;
}
}
is_signal = true;
if (height > large_size_threshold) {
/* "big" */
if (best_distance > 30) { // arbitrary
closest = 0;
}
} else {
/* "small" */
if (best_distance > 10) { // arbitrary
closest = 0;
}
}
/* if we didn't find a signal close by, check the speakers */
if (!closest) {
for (Targets::const_iterator i = speakers.begin(); i != speakers.end(); ++i) {
candidate = *i;
candidate->position.cartesian (c);
cart_to_gtk (c);
distance = sqrt ((c.x - x) * (c.x - x) +
(c.y - y) * (c.y - y));
if (distance < best_distance) {
closest = candidate;
best_distance = distance;
}
}
if (height > large_size_threshold) {
/* "big" */
if (best_distance < 30) { // arbitrary
is_signal = false;
} else {
closest = 0;
}
} else {
/* "small" */
if (best_distance < 10) { // arbitrary
is_signal = false;
} else {
closest = 0;
}
}
}
return closest;
}
bool
Panner2d::on_motion_notify_event (GdkEventMotion *ev)
{
gint x, y;
GdkModifierType state;
if (ev->is_hint) {
gdk_window_get_pointer (ev->window, &x, &y, &state);
} else {
x = (int) floor (ev->x);
y = (int) floor (ev->y);
state = (GdkModifierType) ev->state;
}
if (ev->state & (GDK_BUTTON1_MASK|GDK_BUTTON2_MASK)) {
did_move = true;
}
return handle_motion (x, y, state);
}
bool
Panner2d::on_expose_event (GdkEventExpose *event)
{
CartesianVector c;
cairo_t* cr;
bool small = (height <= large_size_threshold);
const double diameter = radius*2.0;
cr = gdk_cairo_create (get_window()->gobj());
/* background */
cairo_rectangle (cr, event->area.x, event->area.y, event->area.width, event->area.height);
if (!panner->bypassed()) {
cairo_set_source_rgba (cr, 0.1, 0.1, 0.1, 1.0);
} else {
cairo_set_source_rgba (cr, 0.1, 0.1, 0.1, 0.2);
}
cairo_fill_preserve (cr);
cairo_clip (cr);
/* offset to give us some border */
cairo_translate (cr, hoffset, voffset);
cairo_set_line_width (cr, 1.0);
/* horizontal line of "crosshairs" */
cairo_set_source_rgba (cr, 0.282, 0.517, 0.662, 1.0);
cairo_move_to (cr, 0.0, radius);
cairo_line_to (cr, diameter, radius);
cairo_stroke (cr);
/* vertical line of "crosshairs" */
cairo_move_to (cr, radius, 0);
cairo_line_to (cr, radius, diameter);
cairo_stroke (cr);
/* the circle on which signals live */
cairo_set_line_width (cr, 2.0);
cairo_set_source_rgba (cr, 0.517, 0.772, 0.882, 1.0);
cairo_arc (cr, radius, radius, radius, 0.0, 2.0 * M_PI);
cairo_stroke (cr);
/* 3 other circles of smaller diameter circle on which signals live */
cairo_set_line_width (cr, 1.0);
cairo_set_source_rgba (cr, 0.282, 0.517, 0.662, 1.0);
cairo_arc (cr, radius, radius, radius * 0.75, 0, 2.0 * M_PI);
cairo_stroke (cr);
cairo_set_source_rgba (cr, 0.282, 0.517, 0.662, 0.85);
cairo_arc (cr, radius, radius, radius * 0.50, 0, 2.0 * M_PI);
cairo_stroke (cr);
cairo_arc (cr, radius, radius, radius * 0.25, 0, 2.0 * M_PI);
cairo_stroke (cr);
if (signals.size() > 1) {
/* arc to show "diffusion" */
double width_angle = fabs (panner->pannable()->pan_width_control->get_value()) * 2 * M_PI;
double position_angle = (2 * M_PI) - panner->pannable()->pan_azimuth_control->get_value() * 2 * M_PI;
cairo_save (cr);
cairo_translate (cr, radius, radius);
cairo_rotate (cr, position_angle - (width_angle/2.0));
cairo_move_to (cr, 0, 0);
cairo_arc_negative (cr, 0, 0, radius, width_angle, 0.0);
cairo_close_path (cr);
if (panner->pannable()->pan_width_control->get_value() >= 0.0) {
/* normal width */
cairo_set_source_rgba (cr, 0.282, 0.517, 0.662, 0.45);
} else {
/* inverse width */
cairo_set_source_rgba (cr, 1.0, 0.419, 0.419, 0.45);
}
cairo_fill (cr);
cairo_restore (cr);
}
if (!panner->bypassed()) {
double arc_radius;
cairo_select_font_face (cr, "sans", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
if (small) {
arc_radius = 4.0;
} else {
cairo_set_font_size (cr, 10);
arc_radius = 12.0;
}
/* signals */
if (signals.size() > 1) {
for (Targets::iterator i = signals.begin(); i != signals.end(); ++i) {
Target* signal = *i;
if (signal->visible) {
signal->position.cartesian (c);
cart_to_gtk (c);
cairo_new_path (cr);
cairo_arc (cr, c.x, c.y, arc_radius, 0, 2.0 * M_PI);
cairo_set_source_rgba (cr, 0.282, 0.517, 0.662, 0.85);
cairo_fill_preserve (cr);
cairo_set_source_rgba (cr, 0.517, 0.772, 0.882, 1.0);
cairo_stroke (cr);
if (!small && !signal->text.empty()) {
cairo_set_source_rgb (cr, 0.517, 0.772, 0.882);
/* the +/- adjustments are a hack to try to center the text in the circle */
if (small) {
cairo_move_to (cr, c.x - 1, c.y + 1);
} else {
cairo_move_to (cr, c.x - 4, c.y + 4);
}
cairo_show_text (cr, signal->text.c_str());
}
}
}
}
/* speakers */
int n = 0;
for (Targets::iterator i = speakers.begin(); i != speakers.end(); ++i) {
Target *speaker = *i;
char buf[256];
++n;
if (speaker->visible) {
CartesianVector c;
speaker->position.cartesian (c);
cart_to_gtk (c);
snprintf (buf, sizeof (buf), "%d", n);
/* stroke out a speaker shape */
cairo_move_to (cr, c.x, c.y);
cairo_save (cr);
cairo_rotate (cr, -(speaker->position.azi/360.0) * (2.0 * M_PI));
if (small) {
cairo_scale (cr, 0.8, 0.8);
} else {
cairo_scale (cr, 1.2, 1.2);
}
cairo_rel_line_to (cr, 4, -2);
cairo_rel_line_to (cr, 0, -7);
cairo_rel_line_to (cr, 5, +5);
cairo_rel_line_to (cr, 5, 0);
cairo_rel_line_to (cr, 0, 5);
cairo_rel_line_to (cr, -5, 0);
cairo_rel_line_to (cr, -5, +5);
cairo_rel_line_to (cr, 0, -7);
cairo_close_path (cr);
cairo_set_source_rgba (cr, 0.282, 0.517, 0.662, 1.0);
cairo_fill (cr);
cairo_restore (cr);
if (!small) {
cairo_set_font_size (cr, 16);
/* move the text in just a bit */
AngularVector textpos (speaker->position.azi, speaker->position.ele, 0.85);
textpos.cartesian (c);
cart_to_gtk (c);
cairo_move_to (cr, c.x, c.y);
cairo_show_text (cr, buf);
}
}
}
/* draw position */
position.position.cartesian (c);
cart_to_gtk (c);
cairo_new_path (cr);
cairo_arc (cr, c.x, c.y, arc_radius, 0, 2.0 * M_PI);
cairo_set_source_rgba (cr, 1.0, 0.419, 0.419, 0.85);
cairo_fill_preserve (cr);
cairo_set_source_rgba (cr, 1.0, 0.905, 0.905, 0.85);
cairo_stroke (cr);
}
cairo_destroy (cr);
return true;
}
bool
Panner2d::on_button_press_event (GdkEventButton *ev)
{
GdkModifierType state;
int x;
int y;
bool is_signal;
if (ev->type == GDK_2BUTTON_PRESS && ev->button == 1) {
return false;
}
did_move = false;
switch (ev->button) {
case 1:
case 2:
x = ev->x - border;
y = ev->y - border;
if ((drag_target = find_closest_object (x, y, is_signal)) != 0) {
if (!is_signal) {
panner->set_position (drag_target->position.azi/360.0);
drag_target = 0;
} else {
drag_target->set_selected (true);
}
}
drag_x = ev->x;
drag_y = ev->y;
state = (GdkModifierType) ev->state;
return handle_motion (drag_x, drag_y, state);
break;
default:
break;
}
return false;
}
bool
Panner2d::on_button_release_event (GdkEventButton *ev)
{
gint x, y;
GdkModifierType state;
bool ret = false;
switch (ev->button) {
case 1:
x = (int) floor (ev->x);
y = (int) floor (ev->y);
state = (GdkModifierType) ev->state;
ret = handle_motion (x, y, state);
drag_target = 0;
break;
case 2:
x = (int) floor (ev->x);
y = (int) floor (ev->y);
state = (GdkModifierType) ev->state;
if (Keyboard::modifier_state_contains (state, Keyboard::TertiaryModifier)) {
toggle_bypass ();
ret = true;
} else {
ret = handle_motion (x, y, state);
}
drag_target = 0;
break;
case 3:
break;
}
return ret;
}
gint
Panner2d::handle_motion (gint evx, gint evy, GdkModifierType state)
{
if (drag_target == 0) {
return false;
}
if ((state & (GDK_BUTTON1_MASK|GDK_BUTTON2_MASK)) == 0) {
return false;
}
if (state & GDK_BUTTON1_MASK && !(state & GDK_BUTTON2_MASK)) {
CartesianVector c;
bool need_move = false;
drag_target->position.cartesian (c);
cart_to_gtk (c);
if ((evx != c.x) || (evy != c.y)) {
need_move = true;
}
if (need_move) {
CartesianVector cp (evx, evy, 0.0);
AngularVector av;
/* canonicalize position and then clamp to the circle */
gtk_to_cart (cp);
clamp_to_circle (cp.x, cp.y);
/* generate an angular representation of the current mouse position */
cp.angular (av);
if (drag_target == &position) {
double degree_fract = av.azi / 360.0;
panner->set_position (degree_fract);
}
}
}
return true;
}
bool
Panner2d::on_scroll_event (GdkEventScroll* ev)
{
switch (ev->direction) {
case GDK_SCROLL_UP:
case GDK_SCROLL_RIGHT:
panner->set_position (panner->pannable()->pan_azimuth_control->get_value() - 1.0/360.0);
break;
case GDK_SCROLL_DOWN:
case GDK_SCROLL_LEFT:
panner->set_position (panner->pannable()->pan_azimuth_control->get_value() + 1.0/360.0);
break;
}
return true;
}
void
Panner2d::cart_to_gtk (CartesianVector& c) const
{
/* cartesian coordinate space:
center = 0.0
dimension = 2.0 * 2.0
increasing y moves up
so max values along each axis are -1..+1
GTK uses a coordinate space that is:
top left = 0.0
dimension = (radius*2.0) * (radius*2.0)
increasing y moves down
*/
const double diameter = radius*2.0;
c.x = diameter * ((c.x + 1.0) / 2.0);
/* extra subtraction inverts the y-axis to match "increasing y moves down" */
c.y = diameter - (diameter * ((c.y + 1.0) / 2.0));
}
void
Panner2d::gtk_to_cart (CartesianVector& c) const
{
const double diameter = radius*2.0;
c.x = ((c.x / diameter) * 2.0) - 1.0;
c.y = (((diameter - c.y) / diameter) * 2.0) - 1.0;
}
void
Panner2d::clamp_to_circle (double& x, double& y)
{
double azi, ele;
double z = 0.0;
double l;
PBD::cartesian_to_spherical (x, y, z, azi, ele, l);
PBD::spherical_to_cartesian (azi, ele, 1.0, x, y, z);
}
void
Panner2d::toggle_bypass ()
{
panner->set_bypassed (!panner->bypassed());
}
Panner2dWindow::Panner2dWindow (boost::shared_ptr<Panner> p, int32_t h, uint32_t inputs)
: ArdourDialog (_("Panner (2D)"))
, widget (p, h)
, bypass_button (_("Bypass"))
{
widget.set_name ("MixerPanZone");
set_title (_("Panner"));
widget.set_size_request (h, h);
bypass_button.signal_toggled().connect (sigc::mem_fun (*this, &Panner2dWindow::bypass_toggled));
button_box.set_spacing (6);
button_box.pack_start (bypass_button, false, false);
spinner_box.set_spacing (6);
left_side.set_spacing (6);
left_side.pack_start (button_box, false, false);
left_side.pack_start (spinner_box, false, false);
bypass_button.show ();
button_box.show ();
spinner_box.show ();
left_side.show ();
hpacker.set_spacing (6);
hpacker.set_border_width (12);
hpacker.pack_start (widget, false, false);
hpacker.pack_start (left_side, false, false);
hpacker.show ();
get_vbox()->pack_start (hpacker);
reset (inputs);
widget.show ();
}
void
Panner2dWindow::reset (uint32_t n_inputs)
{
widget.reset (n_inputs);
#if 0
while (spinners.size() < n_inputs) {
// spinners.push_back (new Gtk::SpinButton (widget.azimuth (spinners.size())));
//spinner_box.pack_start (*spinners.back(), false, false);
//spinners.back()->set_digits (4);
spinners.back()->show ();
}
while (spinners.size() > n_inputs) {
spinner_box.remove (*spinners.back());
delete spinners.back();
spinners.erase (--spinners.end());
}
#endif
}
void
Panner2dWindow::bypass_toggled ()
{
bool view = bypass_button.get_active ();
bool model = widget.get_panner()->bypassed ();
if (model != view) {
widget.get_panner()->set_bypassed (view);
}
}
bool
Panner2dWindow::on_key_press_event (GdkEventKey* event)
{
return relay_key_press (event, &PublicEditor::instance());
}
bool
Panner2dWindow::on_key_release_event (GdkEventKey *event)
{
return true;
}
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