preparations for a working speaker editing dialog

git-svn-id: svn://localhost/ardour2/branches/3.0@8878 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 391 insertions, 0 deletions

diff --git a/gtk2_ardour/speaker_dialog.cc b/gtk2_ardour/speaker_dialog.cc
new file mode 100644
index 0000000000..33200e99e0
--- /dev/null
+++ b/gtk2_ardour/speaker_dialog.cc
@@ -0,0 +1,391 @@
+/*
+    Copyright (C) 2011 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 "pbd/cartesian.h"
+
+#include "gtkmm2ext/keyboard.h"
+
+#include "speaker_dialog.h"
+
+#include "i18n.h"
+
+using namespace ARDOUR;
+using namespace PBD;
+using namespace std;
+using namespace Gtk;
+using namespace Gtkmm2ext;
+
+SpeakerDialog::SpeakerDialog ()
+        : ArdourDialog (_("Speaker Configuration"))
+        , azimuth_adjustment (0, 0.0, 360.0, 10.0, 1.0)
+        , azimuth_spinner (azimuth_adjustment)
+        , add_speaker_button (_("Add Speaker"))
+        , use_system_button (_("Use System"))
+                              
+{
+        set_size_request (400, 200);
+        
+        side_vbox.set_homogeneous (false);
+        side_vbox.set_border_width (9);
+        side_vbox.set_spacing (6);
+        side_vbox.pack_start (azimuth_spinner, false, false);
+        side_vbox.pack_start (add_speaker_button, false, false);
+        side_vbox.pack_start (use_system_button, false, false);
+
+        hbox.set_spacing (6);
+        hbox.set_border_width (6);
+        hbox.pack_start (darea, true, true);
+        hbox.pack_start (side_vbox, false, false);
+
+        get_vbox()->pack_start (hbox);
+        get_vbox()->show_all ();
+
+        darea.signal_size_allocate().connect (sigc::mem_fun (*this, &SpeakerDialog::darea_size_allocate));
+        darea.signal_expose_event().connect (sigc::mem_fun (*this, &SpeakerDialog::darea_expose_event));
+        darea.signal_button_press_event().connect (sigc::mem_fun (*this, &SpeakerDialog::darea_button_press_event));
+        darea.signal_button_release_event().connect (sigc::mem_fun (*this, &SpeakerDialog::darea_button_release_event));
+        darea.signal_motion_notify_event().connect (sigc::mem_fun (*this, &SpeakerDialog::darea_motion_notify_event));
+
+        drag_index = -1;
+}
+
+void
+SpeakerDialog::set_speakers (const Speakers& s) 
+{
+        speakers = s;
+}
+
+Speakers
+SpeakerDialog::get_speakers () const
+{
+        return speakers;
+}
+
+bool
+SpeakerDialog::darea_expose_event (GdkEventExpose* event)
+{
+	gint x, y;
+	cairo_t* cr;
+
+	cr = gdk_cairo_create (darea.get_window()->gobj());
+
+	cairo_set_line_width (cr, 1.0);
+
+	cairo_rectangle (cr, event->area.x, event->area.y, event->area.width, event->area.height);
+        cairo_set_source_rgba (cr, 0.1, 0.1, 0.1, 1.0);
+	cairo_fill_preserve (cr);
+	cairo_clip (cr);
+
+	if (height > 100) {
+		cairo_translate (cr, 10.0, 10.0);
+	}
+
+	/* horizontal line of "crosshairs" */
+
+	cairo_set_source_rgb (cr, 0.0, 0.1, 0.7);
+	cairo_move_to (cr, 0.5, height/2.0+0.5);
+	cairo_line_to (cr, width+0.5, height/2+0.5);
+	cairo_stroke (cr);
+
+	/* vertical line of "crosshairs" */
+	
+	cairo_move_to (cr, width/2+0.5, 0.5);
+	cairo_line_to (cr, width/2+0.5, height+0.5);
+	cairo_stroke (cr);
+
+	/* the circle on which signals live */
+
+	cairo_arc (cr, width/2, height/2, height/2, 0, 2.0 * M_PI);
+	cairo_stroke (cr);
+
+        float arc_radius;
+        
+        cairo_select_font_face (cr, "sans", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
+        
+        if (height < 100) {
+                cairo_set_font_size (cr, 10);
+                arc_radius = 2.0;
+        } else {
+                cairo_set_font_size (cr, 16);
+                arc_radius = 4.0;
+        }
+
+        uint32_t n = 0;
+        for (vector<Speaker>::iterator i = speakers.speakers().begin(); i != speakers.speakers().end(); ++i) {
+                
+                Speaker& s (*i);
+                CartesianVector c (s.coords());
+                
+                cart_to_gtk (c);
+                
+                x = (gint) floor (c.x);
+                y = (gint) floor (c.y);
+                
+                /* XXX need to shift circles so that they are centered on the circle */
+                
+                cairo_arc (cr, x, y, arc_radius, 0, 2.0 * M_PI);
+                cairo_set_source_rgb (cr, 0.8, 0.2, 0.1);
+                cairo_close_path (cr);
+                cairo_fill (cr);
+                
+                cairo_move_to (cr, x + 6, y + 6);
+                
+                char buf[256];
+                snprintf (buf, sizeof (buf), "%d:%d", n+1, (int) lrint (s.angles().azi));
+                cairo_show_text (cr, buf);
+                ++n;
+        }
+
+        cairo_destroy (cr);
+
+	return true;
+        
+}
+
+void
+SpeakerDialog::cart_to_gtk (CartesianVector& c) const
+{
+	/* "c" uses a coordinate space that is:
+            
+	   center = 0.0
+	   dimension = 2.0 * 2.0
+	   so max values along each axis are -1..+1
+
+	   GTK uses a coordinate space that is:
+
+	   top left = 0.0
+	   dimension = width * height
+	   so max values along each axis are 0,width and
+	   0,height
+	*/
+
+	c.x = (width / 2) * (c.x + 1);
+	c.y = (height / 2) * (1 - c.y);
+
+	/* XXX z-axis not handled - 2D for now */
+}
+
+void
+SpeakerDialog::gtk_to_cart (CartesianVector& c) const
+{
+	c.x = (c.x / (width / 2.0)) - 1.0;
+	c.y = -((c.y / (height / 2.0)) - 1.0);
+
+	/* XXX z-axis not handled - 2D for now */
+}
+
+void
+SpeakerDialog::clamp_to_circle (double& x, double& y)
+{
+	double azi, ele;
+	double z = 0.0;
+        
+	PBD::cart_to_azi_ele (x, y, z, azi, ele);
+	PBD::azi_ele_to_cart (azi, ele, x, y, z);
+}
+
+void
+SpeakerDialog::darea_size_allocate (Gtk::Allocation& alloc)
+{
+  	width = alloc.get_width();
+  	height = alloc.get_height();
+
+	if (height > 100) {
+		width -= 20;
+		height -= 20;
+	}
+}
+
+bool
+SpeakerDialog::darea_button_press_event (GdkEventButton *ev)
+{
+	GdkModifierType state;
+
+	if (ev->type == GDK_2BUTTON_PRESS && ev->button == 1) {
+		return false;
+	}
+
+        drag_index = -1;
+
+	switch (ev->button) {
+	case 1:
+	case 2:
+		find_closest_object (ev->x, ev->y, drag_index);
+		drag_x = (int) floor (ev->x);
+		drag_y = (int) floor (ev->y);
+		state = (GdkModifierType) ev->state;
+
+		return handle_motion (drag_x, drag_y, state);
+		break;
+
+	default:
+		break;
+	}
+
+	return false;
+}
+
+bool
+SpeakerDialog::darea_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;
+
+		if (Keyboard::modifier_state_contains (state, Keyboard::TertiaryModifier)) {
+                        
+			for (vector<Speaker>::iterator i = speakers.speakers().begin(); i != speakers.speakers().end(); ++i) {
+				/* XXX DO SOMETHING TO SET SPEAKER BACK TO "normal" */
+			}
+
+			queue_draw ();
+			ret = true;
+
+		} else {
+			ret = handle_motion (x, y, state);
+		}
+
+		break;
+
+	case 2:
+		x = (int) floor (ev->x);
+		y = (int) floor (ev->y);
+		state = (GdkModifierType) ev->state;
+
+                ret = handle_motion (x, y, state);
+		break;
+
+	case 3:
+		break;
+
+	}
+        
+        drag_index = -1;
+
+	return ret;
+}
+
+int
+SpeakerDialog::find_closest_object (gdouble x, gdouble y, int& which) 
+{
+	float distance;
+	float best_distance = FLT_MAX;
+	int pwhich = -1;
+
+	which = 0;
+	pwhich = 0;
+
+	for (vector<Speaker>::iterator i = speakers.speakers().begin(); i != speakers.speakers().end(); ++i, ++pwhich) {
+
+		Speaker& candidate (*i);
+
+		CartesianVector c;
+
+		candidate.angles().cartesian (c);
+		cart_to_gtk (c);
+
+		distance = sqrt ((c.x - x) * (c.x - x) +
+		                 (c.y - y) * (c.y - y));
+
+		if (distance < best_distance) {
+			best_distance = distance;
+			which = pwhich;
+		}
+	}
+
+
+	if (best_distance > 20) { // arbitrary 
+		return 0;
+	}
+
+	return 1;
+}
+
+bool
+SpeakerDialog::darea_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;
+	}
+
+	return handle_motion (x, y, state);
+}
+
+bool
+SpeakerDialog::handle_motion (gint evx, gint evy, GdkModifierType state)
+{
+	if (drag_index < 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;
+                Speaker& moving (speakers.speakers()[drag_index]);
+
+		moving.angles().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);
+
+			/* canonicalize position */
+
+			gtk_to_cart (cp);
+
+			/* position actual signal on circle */
+
+			clamp_to_circle (cp.x, cp.y);
+                        
+			/* generate an angular representation and set drag target (GUI) position */
+
+                        AngularVector a;
+
+			cp.angular (a);
+
+                        moving.move (a);
+
+			queue_draw ();
+		}
+	} 
+
+	return true;
+}