feat: use DMS coordinate format (Degrees, Minutes, Seconds)

create_map_poster.py

@@ -250,6 +250,34 @@ def has_chinese(text):
     return False
 
 
+def decimal_to_dms(decimal_deg, is_lat=True, lang="cn"):
+    """
+    Convert decimal degrees to Degrees, Minutes, Seconds format.
+    Example: 东经E：113°56′9.30″ 北纬N：22°28′48.07″
+    """
+    abs_deg = abs(decimal_deg)
+    degrees = int(abs_deg)
+    minutes_float = (abs_deg - degrees) * 60
+    minutes = int(minutes_float)
+    seconds = (minutes_float - minutes) * 60
+
+    if is_lat:
+        suffix = "N" if decimal_deg >= 0 else "S"
+        label = "北纬" if decimal_deg >= 0 else "南纬"
+        if lang != "cn":
+            label = "Lat "
+    else:
+        suffix = "E" if decimal_deg >= 0 else "W"
+        label = "东经" if decimal_deg >= 0 else "西经"
+        if lang != "cn":
+            label = "Long "
+
+    if lang == "cn":
+        return f"{label}{suffix}：{degrees}°{minutes}′{seconds:.2f}″"
+    else:
+        return f"{label}{suffix}: {degrees}°{minutes}'{seconds:.2f}\""
+
+
 def get_coordinates(city, country, parent=None):
     """
     Fetches coordinates for a given city and country.
@@ -603,13 +631,12 @@ def create_poster(
         # Only show if there is at least a title or subtitle, or if specifically desired
         if display_city or display_country:
             lat, lon = point
-            coords_text = (
-                f"{lat:.4f}° N / {lon:.4f}° E"
-                if lat >= 0
-                else f"{abs(lat):.4f}° S / {lon:.4f}° E"
-            )
-            if lon < 0:
-                coords_text = coords_text.replace("E", "W")
+            lang_type = "cn" if is_chinese else "en"
+            
+            dms_lon = decimal_to_dms(lon, is_lat=False, lang=lang_type)
+            dms_lat = decimal_to_dms(lat, is_lat=True, lang=lang_type)
+            
+            coords_text = f"{dms_lon}   {dms_lat}"
 
             ax.text(
                 0.5,