[ui] update Spiral from processor

Amuencha/AmuenchaModel.cpp

@@ -4,6 +4,15 @@ namespace Amuencha
 {
 void Analyser::operator()(halp::tick t)
 {
+  if (inputs.min != previous_min ||
+     inputs.max != previous_max)
+  {
+    send_message(processor_to_ui{.min = inputs.min,
+                                 .max = inputs.max});
+    previous_min = inputs.min;
+    previous_max = inputs.max;
+  }
+
   // Process the input buffer
   auto* in = inputs.audio[0];
 

Amuencha/AmuenchaModel.hpp

@@ -52,6 +52,9 @@ public:
 
   // UI is defined in another file to keep things clear.
   struct ui;
+
+private:
+  double previous_min{24}, previous_max{72};
 };
 
 }

Amuencha/AmuenchaUi.hpp

@@ -22,22 +22,20 @@ struct Analyser::ui
     halp::item<&ins::max> max;
   } controls;
 
-  struct
-  {
-    halp_meta(layout, halp::layouts::vbox)
-    halp_meta(background, halp::colors::mid)
-    halp_meta(width, 500)
-    halp_meta(height, 500)
-
-    halp::custom_actions_item<SpiralDisplay> widget{.x = 0, .y = 0};
-  } spiral;
+  halp::custom_actions_item<SpiralDisplay> spiral{.x = 0, .y = 0};
 
   // Define the communication between UI and processor.
   struct bus
   {
+    // // Set up connections
+    // init(ui& self)
+    // {
+    // }
+
     // Receive a message on the UI thread from the processing thread
-    static void process_message(ui& self, processor_to_ui msg)
+    static void process_message(ui& self, const processor_to_ui& msg)
     {
+      self.spiral.set_min_max_notes(msg.min, msg.max);
     }
   };
 };

Amuencha/SpiralDisplay.cpp

@@ -3,12 +3,26 @@
 Amuencha::SpiralDisplay::SpiralDisplay()
     : min_midi_note{24}
     , max_midi_note{72}
+    , gain{1.f}
 {
   for (int i{0}; i < 12; i++) note_positions[i] = std::polar(.9f, half_pi - i * two_pi / 12);
 
   display_spectrum.resize(num_ID);
 }
 
+void Amuencha::SpiralDisplay::set_min_max_notes(int min_midi_note, int max_midi_note)
+{
+  if (max_midi_note < min_midi_note) std::swap(min_midi_note, max_midi_note);
+
+  this->min_midi_note = min_midi_note;
+  this->max_midi_note = max_midi_note;
+  display_bins.clear();
+  // QPainterPath empty;
+  // base_spiral.swap(empty);
+  // for(int id=0; id<num_ID; ++id) all_spirals[id].clear();
+  // update();
+}
+
 void Amuencha::SpiralDisplay::compute_frequencies()
 {
   // Now the spiral

Amuencha/SpiralDisplay.hpp

@@ -19,6 +19,10 @@ struct SpiralDisplay
   static consteval int width() { return 500; }
   static consteval int height() { return 500; }
 
+  void set_min_max_notes(int min_midi_note, int max_midi_note);
+
+  float gain;
+
   void paint(avnd::painter auto ctx)
   {
     half = height() * .5f;
@@ -36,8 +40,6 @@ struct SpiralDisplay
                     note_names[i]);
     }
 
-    ctx.stroke();
-
     int num_octaves = (max_midi_note - min_midi_note + 11) / 12;
 
     for (int id{0}; id < num_ID; ++id)
@@ -62,6 +64,7 @@ struct SpiralDisplay
     }
 
     // Overlay the base spiral in black
+    // FIXME : find the avendish way to store a painter
     // if (base_spiral.isEmpty()) {
       ctx.move_to(x(spiral_positions.back().real()), y(spiral_positions.back().imag()));
       for (int b = spiral_positions.size() - 1; b >= 0; --b)
@@ -91,6 +94,8 @@ private:
 
   std::array<std::complex<float>, 12> note_positions{};
 
+  int min_midi_note, max_midi_note, visual_fading;
+
   // central frequencies (log space)
   std::vector<float> frequencies;
 
@@ -109,9 +114,7 @@ private:
   struct Radius_Angle {float r, a;};
   std::vector<Radius_Angle> spiral_r_a;
 
-  int min_midi_note, max_midi_note, visual_fading;
-
-  float gain{1.f}, half;
+  float half;
 
   float x(float x) const
   {