From cd4b6e85a810b94b638d32710741ed1f07ce0a31 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Wed, 7 Dec 2022 21:27:46 -0700
Subject: [PATCH] pick route colors from the color palette (with random
 variation) #9115

---
 gtk2_ardour/axis_view.cc |  2 +-
 gtk2_ardour/utils.cc     | 20 +++++++++++++++++++-
 gtk2_ardour/utils.h      |  2 +-
 3 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/gtk2_ardour/axis_view.cc b/gtk2_ardour/axis_view.cc
index b13a0d8891..b87e911536 100644
--- a/gtk2_ardour/axis_view.cc
+++ b/gtk2_ardour/axis_view.cc
@@ -65,7 +65,7 @@ AxisView::~AxisView()
 Gdk::Color
 AxisView::unique_random_color()
 {
-	return ::unique_random_color (used_colors);
+	return ::unique_random_color (used_colors, true);
 }
 
 string
diff --git a/gtk2_ardour/utils.cc b/gtk2_ardour/utils.cc
index 3f07bd3b39..7e69da7815 100644
--- a/gtk2_ardour/utils.cc
+++ b/gtk2_ardour/utils.cc
@@ -680,10 +680,28 @@ ARDOUR_UI_UTILS::escape_underscores (string const & s)
 }
 
 Gdk::Color
-ARDOUR_UI_UTILS::unique_random_color (list<Gdk::Color>& used_colors)
+ARDOUR_UI_UTILS::unique_random_color (list<Gdk::Color>& used_colors, bool from_palette)
 {
 	Gdk::Color newcolor;
 
+	if (from_palette) {
+
+		string cp = UIConfiguration::instance().get_stripable_color_palette ();
+		Gdk::ArrayHandle_Color gc = ColorSelection::palette_from_string (cp);
+		std::vector<Gdk::Color> c (gc);
+		int n = random () % c.size();
+		Gtkmm2ext::HSV hsv (Gtkmm2ext::gdk_color_to_rgba (c[n]));
+
+		do {
+			newcolor.set_hsv (hsv.h, hsv.s, hsv.v);
+			hsv = random() % 1000 > 500 ? hsv.darker ((random() % 500) / 1000.0) : hsv.lighter ((random() % 500 / 1000.0));
+		} while (find (used_colors.begin(), used_colors.end(), newcolor) != used_colors.end());
+
+		used_colors.push_back (newcolor);
+
+		return newcolor;
+	}
+
 	while (1) {
 
 		double h, s, v;
diff --git a/gtk2_ardour/utils.h b/gtk2_ardour/utils.h
index 49d6eb6845..aa5a705eea 100644
--- a/gtk2_ardour/utils.h
+++ b/gtk2_ardour/utils.h
@@ -98,7 +98,7 @@ void resize_window_to_proportion_of_monitor (Gtk::Window*, int, int);
 
 std::string escape_underscores (std::string const &);
 
-Gdk::Color unique_random_color (std::list<Gdk::Color> &);
+Gdk::Color unique_random_color (std::list<Gdk::Color> &, bool from_palette = false);
 
 std::string rate_as_string (float r);
 std::string samples_as_time_string (ARDOUR::samplecnt_t s, float r, bool show_samples = false);