Add phase labels -180..180 deg for analysis display

diff --git a/gtk2_ardour/plugin_eq_gui.cc b/gtk2_ardour/plugin_eq_gui.cc
index 7da504c9cc08a9feaf61da1da2ab3967aa35d847..7479ae08166ee5ad844c01e0f927923ee53d9f40 100644 (file)
--- a/gtk2_ardour/plugin_eq_gui.cc
+++ b/gtk2_ardour/plugin_eq_gui.cc
@@ -590,7 +590,7 @@ PluginEqGui::draw_scales_phase (Gtk::Widget*, cairo_t *cr)
        char buf[256];
        cairo_text_extents_t t_ext;
 
-       for (uint32_t i = 0; i < 3; i++) {
+       for (uint32_t i = 0; i < 5; i++) {
 
                y = _analysis_height / 2.0 - (float)i * (_analysis_height / 8.0) * PHASE_PROPORTION;
 
@@ -604,14 +604,17 @@ PluginEqGui::draw_scales_phase (Gtk::Widget*, cairo_t *cr)
                cairo_move_to (cr, _analysis_width - t_ext.width - t_ext.x_bearing - 2.0, y - extents.descent);
                cairo_show_text (cr, buf);
 
-               if (i == 0)
+               if (i == 0) {
                        continue;
+               }
 
+               y = roundf (y) - .5;
 
-               cairo_set_source_rgba (cr, .8, .9, 0.2, 0.6 / (float)i);
+               cairo_set_source_rgba (cr, .8, .9, .2, 0.4);
                cairo_move_to (cr, 0.0,             y);
                cairo_line_to (cr, _analysis_width, y);
-
+               cairo_set_line_width (cr, 1);
+               cairo_stroke (cr);
 
                y = _analysis_height / 2.0 + (float)i * (_analysis_height / 8.0) * PHASE_PROPORTION;
 
@@ -622,12 +625,13 @@ PluginEqGui::draw_scales_phase (Gtk::Widget*, cairo_t *cr)
                cairo_move_to (cr, _analysis_width - t_ext.width - t_ext.x_bearing - 2.0, y - extents.descent);
                cairo_show_text (cr, buf);
 
+               y = roundf (y) - .5;
                // line
-               cairo_set_source_rgba (cr, .8, .9, 0.2, 0.6 / (float)i);
+               cairo_set_source_rgba (cr, .8, .9, .2, 0.4);
                cairo_move_to (cr, 0.0,             y);
                cairo_line_to (cr, _analysis_width, y);
 
-               cairo_set_line_width (cr, 0.25 + 1.0 / (float)(i + 1));
+               cairo_set_line_width (cr, 1);
                cairo_stroke (cr);
        }
 }
@@ -643,14 +647,15 @@ PluginEqGui::plot_impulse_phase (Gtk::Widget *w, cairo_t *cr)
 
        // float width  = w->get_width();
        float height = w->get_height ();
+       float analysis_height_2 = _analysis_height / 2.f;
 
        cairo_set_source_rgba (cr, 0.95, 0.3, 0.2, 1.0);
        for (uint32_t i = 0; i < _impulse_fft->bins() - 1; ++i) {
                // x coordinate of bin i
                x  = log10f (1.0 + (float)i / (float)_impulse_fft->bins() * _log_coeff) / _log_max;
                x *= _analysis_width;
+               y  = analysis_height_2 - (_impulse_fft->phase_at_bin (i) / M_PI) * analysis_height_2 * PHASE_PROPORTION;
 
-               y  = _analysis_height/2.0 - (_impulse_fft->phase_at_bin(i)/M_PI)*(_analysis_height/2.0)*PHASE_PROPORTION;
                if (i == 0) {
                        cairo_move_to (cr, x, y);
                        avgY = 0;