Display initial swatch using default colour centre

app/gui/color_picker.py

@@ -83,12 +83,17 @@ class ColorPickerMixin:
 
     def _update_selected_colour(self, r: int, g: int, b: int) -> None:
         self.selected_colour = (r, g, b)
+        hex_colour = f"#{r:02x}{g:02x}{b:02x}"
         if hasattr(self, "current_colour_sw"):
-            hex_colour = f"#{r:02x}{g:02x}{b:02x}"
             try:
                 self.current_colour_sw.configure(background=hex_colour)
             except Exception:
                 pass
+        if hasattr(self, "current_colour_label"):
+            try:
+                self.current_colour_label.configure(text=f"Aktuelle Farbe ({hex_colour})")
+            except Exception:
+                pass
 
     def _set_slider_targets(self, hue_deg: float, saturation: float, value: float) -> None:
         span = getattr(self, "hue_span", 45.0)

app/gui/ui.py

@@ -1,10 +1,11 @@
-"""UI helpers and reusable Tk callbacks."""
-
-from __future__ import annotations
-
-import tkinter as tk
-import tkinter.font as tkfont
-from tkinter import ttk
+"""UI helpers and reusable Tk callbacks."""
+
+from __future__ import annotations
+
+import colorsys
+import tkinter as tk
+import tkinter.font as tkfont
+from tkinter import ttk
 
 
 class UIBuilderMixin:
@@ -49,16 +50,17 @@ class UIBuilderMixin:
 
         palette_frame = ttk.Frame(self.root)
         palette_frame.pack(fill=tk.X, padx=12, pady=(6, 8))
+        default_colour = self._default_colour_hex()
         self.current_colour_sw = tk.Canvas(
             palette_frame,
             width=24,
             height=24,
             highlightthickness=0,
-            background="#f2c744",
+            background=default_colour,
             bd=0,
         )
         self.current_colour_sw.pack(side=tk.LEFT, padx=(0, 8), pady=2)
-        self.current_colour_label = ttk.Label(palette_frame, text="Aktuelle Farbe")
+        self.current_colour_label = ttk.Label(palette_frame, text=f"Aktuelle Farbe ({default_colour})")
         self.current_colour_label.pack(side=tk.LEFT, padx=(0, 8))
         ttk.Label(palette_frame, text="Beispielfarben:").pack(side=tk.LEFT, padx=(0, 8))
         swatch_container = ttk.Frame(palette_frame)
@@ -514,6 +516,26 @@ class UIBuilderMixin:
             self.ratio_label.configure(foreground=colour)
         except Exception:
             pass
+
+    def _default_colour_hex(self) -> str:
+        defaults = getattr(self, "DEFAULTS", {})
+        hue_min = float(defaults.get("hue_min", 0.0))
+        hue_max = float(defaults.get("hue_max", hue_min))
+        if hue_min <= hue_max:
+            hue = (hue_min + hue_max) / 2.0
+        else:
+            span = ((hue_max + 360.0) - hue_min) / 2.0
+            hue = (hue_min + span) % 360.0
+
+        sat_min = float(defaults.get("sat_min", 0.0))
+        saturation = (sat_min + 100.0) / 2.0
+
+        val_min = float(defaults.get("val_min", 0.0))
+        val_max = float(defaults.get("val_max", 100.0))
+        value = (val_min + val_max) / 2.0
+
+        r, g, b = colorsys.hsv_to_rgb(hue / 360.0, saturation / 100.0, value / 100.0)
+        return f"#{int(r * 255):02x}{int(g * 255):02x}{int(b * 255):02x}"
 
     def _init_copy_menu(self):
         self._copy_target = None